Contents of: J/ApJS/149/29/./notes.dat

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## (from tabmap V6.0 (2016-08-18)) 2018-04-25T01:07:34
#-- J/ApJS/149/29 ROSAT North Ecliptic Pole Survey (Gioia+, 2003)
#---Table: J/ApJS/149/29/./notes.dat Individual notes  (346 records)
#       --- A2     ---   [RX]
#        RX A12    ---   Object name (JHHMM.m+DDMM)
#      Note A64    ---   Text of the note
  RX          |Note
RXJ1716.2+6836|Also called RX J1716.0+6836 in Boller et al.
RXJ1716.2+6836| (1997MNRAS.289..393B). The identification comes from the
RXJ1716.2+6836| revised Burbidge catalog (Hewitt & Burbidge, Cat. VII/158,
RXJ1716.2+6836| 1993ApJS...87..451H).
RXJ1717.7+6431|There is a star within the error circle that is closer to the
RXJ1717.7+6431| X-ray position (7.7") than the AGN2. We still believe that the
RXJ1717.7+6431| AGN2 is the correct identification, not only because it is an
RXJ1717.7+6431| AGN but also because it appears to be in a distorted spiral in
RXJ1717.7+6431| our UH 2.2m B-band image. Distortion implies some kind of
RXJ1717.7+6431| interaction and often these distorted galaxies are X-ray
RXJ1717.7+6431| sources.
RXJ1719.8+6457|This source is one of two sources in the NEP still unidentified.
RXJ1719.8+6457| Optical spectra were taken for seven objects within 80" from
RXJ1719.8+6457| the X-ray position, but no plausible identification was found.
RXJ1720.8+6210|There are two galaxies at the same redshift as the AGN1
RXJ1720.8+6210| (z=0.7313) and closer to the X-ray centroid (approximate
RXJ1720.8+6210| positions from DSS-2 red are for cfh 11,
RXJ1720.8+6210| RA_2000_ = 17 20 46.8, DE_2000_ = +62 10 25; and for cfh 12b,
RXJ1720.8+6210| RA_2000_ = 17 20 43.9, DE_2000_ = +62 10 11). We still identify
RXJ1720.8+6210| the source as AGN1 since its spectrum shows a broad Mg II
RXJ1720.8+6210| emission line (FWHM>4000km/s). However, the presence of a
RXJ1720.8+6210| distant cluster at z~0.73 is not excluded.
RXJ1723.1+6826|This source is identified with a QSO (RA_2000_ = 17 23 09.9,
RXJ1723.1+6826| DE_2000_ = +68 26 56;, z=0.9782+/-0.001) that is 4" away from
RXJ1723.1+6826| the X-ray centroid. The optical spcetrum shows a very broad
RXJ1723.1+6826| Mg II emission line (FWHM>=7000km/s). A second object at
RXJ1723.1+6826| RA_2000_ = 17 23 10.1, DE_2000_ = +68 26 51, just south of the
RXJ1723.1+6826| QSO and only 3.4" away from the X-ray centroid, has a similar
RXJ1723.1+6826| redshift (z=0.9777) as the QSO. This second object is fainter
RXJ1723.1+6826| and has a narrower Mg II line in emission. Both objects could
RXJ1723.1+6826| contribute to the X-ray emission even if we indicate the object
RXJ1723.1+6826| with broader Mg II line as the identification in the table.
RXJ1724.1+7000|and RX J1724.2+6956 These two sources were identified as a group
RXJ1724.1+7000| of galaxies in Henry et al. (1995ApJ...449..422H). The X-ray
RXJ1724.1+7000| morphology is complex and elongated along the north-south
RXJ1724.1+7000| direction (see Fig. 1a in Henry et al.. 1995ApJ...449..422H).
RXJ1724.1+7000| We confirm here the identification of these sources with a
RXJ1724.1+7000| single group of galaxies at z=0.0386.
RXJ1724.2+6956|See RX J1724.1+7000.
RXJ1727.0+6926|A radio source (0.96+/-0.06mJy at 6cm) was detected with the VLA
RXJ1727.0+6926| in the DnC array at the position of the optical counterpart by
RXJ1727.0+6926| T. Rector (2003, private communication).
RXJ1727.8+6748|There are several galaxies in the area for which no optical
RXJ1727.8+6748| spectrum is available. The suggested identification is the AGN1
RXJ1727.8+6748| at z=0.4950 (RA_2000_ = 17 27 45.5, DE_2000_ = +67 48 43) lying
RXJ1727.8+6748| 22" away from the X-ray centroid, with a broad (FWHM>7000km/s)
RXJ1727.8+6748| Mg II emission line in its optical spectrum.
RXJ1732.5+7031|This object appears in the sample of identified northern ROSAT
RXJ1732.5+7031| sources by Appenzeller et al. (1998ApJS..117..319A) with a
RXJ1732.5+7031| redshift z=0.209 versus our z=0.2114.
RXJ1732.9+6533|The redshift for this QSO (z=0.8560) comes from Hewitt &
RXJ1732.9+6533| Burbidge (Cat. VII/158, 1993ApJS...87..451H).
RXJ1736.3+6802|This group of galaxies was published in Henry et al.
RXJ1736.3+6802| (1995ApJ...449..422H). There are 12 galaxies with spectroscopic
RXJ1736.3+6802| redshifts. Refer to Henry et al. (1995ApJ...449..422H) for more
RXJ1736.3+6802| details and for an X-ray contour image (their Fig. 1c).
RXJ1736.9+6845|This X-ray source is MS 1737.2+6847 and its identification with
RXJ1736.9+6845| SAO17576 ({omega} Draconis) comes from the EMSS; see Stocke et
RXJ1736.9+6845| al. (1991ApJS...76..813S) and Maccacaro et al.
RXJ1736.9+6845| (1994ApL....29..267M).
RXJ1736.4+6820|The X-ray source is identified with GAT 732, a star with an E
RXJ1736.4+6820| magnitude in APM of 8.98. The star has a high proper motion
RXJ1736.4+6820| (about 1' in 50yr).
RXJ1739.7+6710|This source is MS 1739.8+6712 and is identified as AGN1. The
RXJ1739.7+6710| redshift, z=0.118, comes from Stocke et al.
RXJ1739.7+6710| (1991ApJS...76..813S); an optical finding chart is published in
RXJ1739.7+6710| Maccacaro et al. (1994ApL....29..267M).
RXJ1741.2+6507|There is a cluster candidate in the field of this source
RXJ1741.2+6507| identified as AGN1 at z=0.7466. We have concordant redshifts
RXJ1741.2+6507| for two galaxies (A and B):
RXJ1741.2+6507| RA_2000_ = 17 41 15.5, DE_2000_ = +65 07 53, z_A_=0.3797;
RXJ1741.2+6507| RA_2000_ = 17 41 07.7, DE_2000_ = +65 07 47, z_B_=0.3775.
RXJ1743.4+6341|This cluster, associated with A2280, has a large gravitational
RXJ1743.4+6341| arc that is described in Gioia et al. (1995A&A...297L..75G).
RXJ1745.2+6556|In the field of this source, identified as a cluster of galaxies
RXJ1745.2+6556| at z=0.6080+/-0.0005 (optical spectrum for a member galaxy is
RXJ1745.2+6556| shown in Fig. 10) there is also an AGN (RA_2000_ = 17 45 17.6,
RXJ1745.2+6556| DE_2000_ = +65 56 02, z=0.2904) that is ~18" away from the
RXJ1745.2+6556| X-ray centroid. The AGN could contribute to the X-ray emission
RXJ1745.2+6556| of the source. However, it is difficult to classify the AGN as
RXJ1745.2+6556| type 1 or type 2 since there is no H{beta} emission line, and
RXJ1745.2+6556| the H{alpha} emission line is blended with N II. The spectrum
RXJ1745.2+6556| of the AGN has a very red continuum.
RXJ1746.1+6737|The identification of this X-ray source comes from the EMSS.
RXJ1746.1+6737| This is MS 1746.2+6738 identified as AGN1 at z=0.041 by Stocke
RXJ1746.1+6737| et al. (1991ApJS...76..813S). The AGN1 (RA_2000_ = 17 46 08.8,
RXJ1746.1+6737| DE_2000_ = +67 37 15) is 25" south of a bright SAO star
RXJ1746.1+6737| (SAO17632, RA_2000_ = 17 46 08.7, DE_2000_ = +67 37 43,
RXJ1746.1+6737| m_V_=7.79), which could also contribute to the X-ray emission.
RXJ1746.2+6227|The redshift for this QSO (z=3.889) is taken from Hook et al.
RXJ1746.2+6227| (1995MNRAS.273L..63H; see their Fig. 2 for a spectrum). Stickel
RXJ1746.2+6227| (1993A&A...275...49S) gives a redshift of z=3.886 for this
RXJ1746.2+6227| object. The QSO was independently discovered as an X-ray source
RXJ1746.2+6227| by Becker, Helfand, & White (1992AJ....104..531B), who measured
RXJ1746.2+6227| a redshift of z=3.87 (optical spectrum in their Fig. 2). An
RXJ1746.2+6227| X-ray spectrum with ASCA is published in Figure 1 of Kubo et
RXJ1746.2+6227| al. (1997MNRAS.287..328K).
RXJ1747.0+6836|This very bright source is MS 1747.2+6837. The identification as
RXJ1747.0+6836| AGN1 (z=0.063) comes from Kriss & Canizares
RXJ1747.0+6836| (1982ApJ...261...51K) and Stocke et al. (1991ApJS...76..813S).
RXJ1747.0+6836| P. F. Winkler (1982, private communication) originally
RXJ1747.0+6836| discovered this object.
RXJ1747.4+6626|There are two objects here, both AGN1 and at the same redshift
RXJ1747.4+6626| (z=0.1391), which could both contribute to the X-ray emission.
RXJ1747.4+6626| The optical position for one of them is RA_2000_ = 17 27 47.0,
RXJ1747.4+6626| DE_2000_ = +66 26 24 (given in Table 3). The second object,
RXJ1747.4+6626| which is a spiral galaxy at z=0.1390, is at
RXJ1747.4+6626| RA_2000_ = 17 47 26.6, DE_2000_ = +66 26 05.
RXJ1747.9+6623|We identify this source as a normal galaxy (GAL), but there are
RXJ1747.9+6623| two objects possibly interacting. Object A
RXJ1747.9+6623| (RA_2000_ = 17 47 58.5, DE_2000_ = +66 23 26, z=0.1739) is a
RXJ1747.9+6623| narrow emission-line galaxy with H{alpha}, H{beta}, H{gamma},
RXJ1747.9+6623| and [O III] emission lines in the optical spectrum and shows
RXJ1747.9+6623| the morphology of a disturbed spiral. Object B
RXJ1747.9+6623| (RA_2000_ = 17 47 56.8, DE_2000_ = +66 23 46, z=0.1737) does
RXJ1747.9+6623| not show any emission line in the spectrum and resembles an
RXJ1747.9+6623| edge-on spiral in our UH 2.2m open image.
RXJ1748.5+7005|Identification and redshift for this BL Lac comes from the
RXJ1748.5+7005| literature. An optical spectrum is published in Figure 7 of
RXJ1748.5+7005| Lawrence et al. (1996ApJS..107..541L); see also note in
RXJ1748.5+7005| Rector & Stocke (2001AJ....122..565R).
RXJ1748.6+6842|There are two AGNs with similar redshift (z=0.0537 and z=0.0540)
RXJ1748.6+6842| that are blended in the APM finder. The western object
RXJ1748.6+6842| (RA_2000_ = 17 48 38.3, DE_2000_ = +68 42 17) has broad
RXJ1748.6+6842| emission lines in its optical spectrum. We indicate this object
RXJ1748.6+6842| as the identification (AGN1). The eastern object
RXJ1748.6+6842| (RA_2000_ = 17 48 38.7, DE_2000_ = +68 42 16) has H{alpha} in
RXJ1748.6+6842| emission but it is difficult to assess the width of the
RXJ1748.6+6842| emission line since the spectrum is rather noisy. Both objects
RXJ1748.6+6842| look like spiral galaxies in our UH 2.2m open image. The two
RXJ1748.6+6842| objects might be interacting, and both could contribute to the
RXJ1748.6+6842| X-ray emission.
RXJ1751.2+6533|This source is associated with the group of galaxies published
RXJ1751.2+6533| in Figure 1e of Henry et al. (1995ApJ...449..422H). The
RXJ1751.2+6533| redshift has been updated using more accurate low-redshift data
RXJ1751.2+6533| from Falco et al. (1999PASP..111..438F).
RXJ1751.5+7013|This source is identified with a cluster of galaxies at
RXJ1751.5+7013| z=0.4925. The two galaxies, for which we have optical spectra,
RXJ1751.5+7013| have narrow emission lines typical of AGN2. One of the AGN2
RXJ1751.5+7013| (RA_2000_ = 17 52 33.1, DE_2000_ = +70 13 01, z=0.4936) has a
RXJ1751.5+7013| narrow Mg II line in emission, in addition to H{beta} and to
RXJ1751.5+7013| [O II] and [O III] lines.
RXJ1752.2+6522|This source is identified as a cluster of galaxies at z=0.3923.
RXJ1752.2+6522| There is also an emission-line object
RXJ1752.2+6522| (RA_2000_ = 17 52 12.9, DE_2000_ = +65 22 36) that is 15.1"
RXJ1752.2+6522| away from the X-ray position with z=0.3940. We still identify
RXJ1752.2+6522| the source with a cluster of galaxies since the spectrum of the
RXJ1752.2+6522| AGN, with H{beta} in emission, is too noisy to assess the width
RXJ1752.2+6522| of the line.
RXJ1753.9+7016|This source is MS 1754.5+7017 and is identified as an AGN1 at
RXJ1753.9+7016| z=0.062 by Stocke et al. (1991ApJS...76..813S).
RXJ1754.0+6452|The redshift for this cluster is tentative because it is based
RXJ1754.0+6452| on three low S/N spectra.
RXJ1754.6+6803|This is MS 1754.9+6803. The redshift (z=0.0770) was measured by
RXJ1754.6+6803| Stocke et al. (1991ApJS...76..813S) and is based on three
RXJ1754.6+6803| galaxy spectra taken at the MMT in 1985 April.
RXJ1756.2+7042|This is one of the two still unidentified sources in the whole
RXJ1756.2+7042| NEP survey. The X-ray source is a double source elongated in
RXJ1756.2+7042| the east-west direction. The eastern X-ray centroid is
RXJ1756.2+7042| identified with an AGN1 (RA_2000_ = 17 56 14.9,
RXJ1756.2+7042| DE_2000_ = +70 41 56, z=0.838) since it shows a broad Mg II
RXJ1756.2+7042| line in emission in its optical spectrum. The western source is
RXJ1756.2+7042| still unidentified. We have taken spectra for several objects
RXJ1756.2+7042| in the area using the Keck II, but none of the objects seems to
RXJ1756.2+7042| be a satisfactory identification.
RXJ1757.2+7033|This source is MS 1757.7+7034, identified by Stocke et al.
RXJ1757.2+7033| (1991ApJS...76..813S) as a BL Lac at z=0.407, from Ca II H and
RXJ1757.2+7033| K, G band, and Mg I b absorption lines.
RXJ1757.2+6547|This X-ray source, identified with an M star
RXJ1757.2+6547| (RA_2000_ = 17 57 14.3, DE_2000_ = +65 46 58, m_E_=14.68), is
RXJ1757.2+6547| 9.4" away from the X-ray centroid in the APM finders. There is
RXJ1757.2+6547| also an AGN1 (RA_2000_ = 17 57 13.6, DE_2000_ = +65 46 45,
RXJ1757.2+6547| z=0.578) 15.7" away from the X-ray centroid with m_E_=19.53 and
RXJ1757.2+6547| m_O_=20.0. The AGN1 could also contribute to the X-ray emission
RXJ1757.2+6547| of the source.
RXJ1757.3+6631|There are five spectroscopic redshifts for this cluster at
RXJ1757.3+6631| z=0.6909. The spectra were taken at the CFHT. None of the five
RXJ1757.3+6631| galaxies are visible on the APM, thus the optical positions are
RXJ1757.3+6631| approximate coordinates measured from the DSS-2 red plate. Two
RXJ1757.3+6631| of the cluster galaxies (cfh 2 at RA_2000_ = 17 57 46.3,
RXJ1757.3+6631| DE_2000_ = +66 30 26, z=0.7006; and cfh 8 at
RXJ1757.3+6631| RA_2000_ = 17 57 29.9, DE_2000_ = +66 32 29, z=0.6860) are
RXJ1757.3+6631| identified as AGN2 galaxies since their optical spectra show
RXJ1757.3+6631| similar narrow forbidden [O III], [O II] and permitted H{beta}
RXJ1757.3+6631| and H{gamma} emission lines.
RXJ1757.9+6609|This source is identified with an AGN2 (RA_2000_ = 17 57 56.5,
RXJ1757.9+6609| DE_2000_ = +66 09 20, z=0.4865) only 4" away from the X-ray
RXJ1757.9+6609| position. See Figure 6 for an optical spectrum of the AGN2.
RXJ1757.9+6609| However, spectroscopic redshifts for two galaxies
RXJ1757.9+6609| (RA_2000_ = 17 58 02.1, DE_2000_ = +66 09 34, and
RXJ1757.9+6609| RA_2000_ = 17 58 00.6, DE_2000_ = +66 07 35) that are located
RXJ1757.9+6609| 36" and 106" away from the X-ray centroid, respectively, are
RXJ1757.9+6609| concordant with the redshift of NEP super cluster (z=0.089)
RXJ1757.9+6609| found in the NEP survey by Mullis et al. (2001, Ph.D. thesis,
RXJ1757.9+6609| Inst. for Astronomy, Univ. Hawaii).
RXJ1758.9+6520|This source is identified with a cluster of galaxies at
RXJ1758.9+6520| z=0.3652. Three cluster galaxies spectroscopically observed
RXJ1758.9+6520| have narrow emission lines (see Fig. 7 for an example of one
RXJ1758.9+6520| cluster member, namely, galaxy C at RA_2000_ = 17 58 53.8,
RXJ1758.9+6520| DE_2000_ = +65 21 02, z_C_=0.3665). A fourth object in the
RXJ1758.9+6520| field at RA_2000_ = 17 59 02.8, DE_2000_ = +65 20 55, has broad
RXJ1758.9+6520| emission lines and is thus identified as AGN1 (z=0.3660). The
RXJ1758.9+6520| identification of the source is still a cluster of galaxies
RXJ1758.9+6520| based on the distance of the AGN1 from the X-ray position
RXJ1758.9+6520| (~35"), but a contribution to the X-ray emission from the AGN1
RXJ1758.9+6520| is not excluded. Thus, this source is a case of cluster
RXJ1758.9+6520| plus AGN.
RXJ1759.7+6629|This X-ray source (AGN1 at z=0.399) was already identified by
RXJ1759.7+6629| Bower et al. (1996MNRAS.281...59B). We took an additional
RXJ1759.7+6629| spectrum to confirm the QSO nature.
RXJ1800.0+6645|This X-ray source is the same as RX J1800.0+6646 in Bower et al.
RXJ1800.0+6645| (1996MNRAS.281...59B) and was identified as a G type star. Our
RXJ1800.0+6645| spectrum confirms that the object is a G-K type star.
RXJ1800.1+6636|This X-ray source was already identified by Bower et al.
RXJ1800.1+6636| (1996MNRAS.281...59B) as a Sy2 galaxy (NGC 6552). We took an
RXJ1800.1+6636| additional spectrum (z=0.0260) to confirm the AGN2 nature.
RXJ1801.2+6902|The redshift for this source (AGN1, z=1.27) comes from Lacy et
RXJ1801.2+6902| al. (1993MNRAS.263..707L).
RXJ1801.2+6624|This X-ray source was already identified in Bower et al.
RXJ1801.2+6624| (1996MNRAS.281...59B) as a QSO at z=1.25.
RXJ1801.7+6638|This is a bright X-ray source identified as a BL Lac in Bower et
RXJ1801.7+6638| al. (1996MNRAS.281...59B; see finding chart in their Fig. 2c
RXJ1801.7+6638| and an optical spectrum in their Fig. 6). The redshift is
RXJ1801.7+6638| unknown since the optical spectrum is featureless. A radio
RXJ1801.7+6638| source (1.07+/-0.04mJy at 6cm) was detected with the VLA in the
RXJ1801.7+6638| DnC array at the position of the optical source by T. Rector
RXJ1801.7+6638| (2003, private communication).
RXJ1802.0+6629|This source was identified as a BL Lac in Bower et al.
RXJ1802.0+6629| (1996MNRAS.281...59B) given the very weak or almost absent
RXJ1802.0+6629| lines in the spectrum they obtained at the Multiple Mirror
RXJ1802.0+6629| Telescope (see their Fig. 3). An optical spectrum of this same
RXJ1802.0+6629| source was obtained by us in 1999 July with KeckII-LRIS (see
RXJ1802.0+6629| Fig. 12). Strong and broad Balmer emission lines are visible in
RXJ1802.0+6629| our spectrum consistent with an AGN1 object, possibly a
RXJ1802.0+6629| variable QSO?
RXJ1802.7+6727|This source is identified as an AGN2 at z=0.1620. There are two
RXJ1802.7+6727| possibly interacting spiral galaxies with optical narrow
RXJ1802.7+6727| emission lines in their spectra, which are blended on the APM
RXJ1802.7+6727| finder. The optical position of galaxy A1, at (z=0.1605), is
RXJ1802.7+6727| RA_2000_ = 18 02 47.8, DE_2000_ = +67 27 41, while the optical
RXJ1802.7+6727| position of galaxy A2, at z=0.1635, is RA_2000_ = 18 02 47.6,
RXJ1802.7+6727| DE_2000_ = +67 27 34. Both galaxies could be responsible for
RXJ1802.7+6727| part of the X-ray emission.
RXJ1803.4+6738|This very bright NEP source is MS 1803+6728 and is identified as
RXJ1803.4+6738| AGN1. The redshift (z=0.1360) was measured by Stocke et al.
RXJ1803.4+6738| (1991ApJS...76..813S). The object is also listed in the QSO
RXJ1803.4+6738| catalog by Hewitt & Burbidge (Cat. VII/158) as HB89, and
RXJ1803.4+6738| in the X-ray NORAS catalog by Boehringer et al.
RXJ1803.4+6738| (2000ApJS..129..435B) as a tentative AGN. Optical spectra taken
RXJ1803.4+6738| at Lick and Multiple Mirror Telescope observatories are shown
RXJ1803.4+6738| in Figure 4 of Treves et al. (1995ApJ...442..589T).
RXJ1803.9+6548|The redshift for this BL Lac (z=0.0850) is tentative since it
RXJ1803.9+6548| has been derived from very weak absorption lines. The source is
RXJ1803.9+6548| also identified with the VLA radio source NEP J1803.9+6548 by
RXJ1803.9+6548| Kollgaard et al. (1994ApJS...93..145K), and it is in the
RXJ1803.9+6548| radio-loud ROSAT NEP sources detected with the VLA at 1.5GHz
RXJ1803.9+6548| by Brinkmann et al. (1999A&AS..134..221B) with a
RXJ1803.9+6548| flux =43.1+/-1.7mJy (see more references therein).
RXJ1804.3+6629|This source is identified with a very hot, subdwarf star. Its
RXJ1804.3+6629| optical position, RA_2000_ = 18 04 24.7, DE_2000_ = +66 29 28,
RXJ1804.3+6629| is 26" away from the X-ray position. There is a second object
RXJ1804.3+6629| in the field that is closer (RA_2000_ = 18 04 20.6,
RXJ1804.3+6629| DE_2000_ = +66 29 54) to the center of the X-ray emission and
RXJ1804.3+6629| for which no spectrum is available. However, this second object
RXJ1804.3+6629| is quite faint, is not blue on the DSS, does not have any
RXJ1804.3+6629| radio emission, and thus is unlikely to be an AGN.
RXJ1806.1+6813|This source is identified as cluster of galaxies at z=0.303.
RXJ1806.1+6813| Four out of six galaxies for which we have taken spectra are
RXJ1806.1+6813| emission-line galaxies, all with concordant redshifts. One of
RXJ1806.1+6813| the four galaxies (RA_2000_ = 18 06 04.8, DE_2000_ = +68 13 08,
RXJ1806.1+6813| z=0.2953) has broad Balmer (FWHM=2500km/s). Thus, this source
RXJ1806.1+6813| is a case of cluster plus AGN.
RXJ1806.4+7028|This source is identified as a galaxy and has an X-ray
RXJ1806.4+7028| luminosity L_X_=1.8x10^43^erg/s (assuming kT=2keV), which is
RXJ1806.4+7028| high for a galaxy with no emission lines. As first noted by
RXJ1806.4+7028| Mullis (2001, Ph.D. thesis, Inst. for Astronomy, Univ. Hawaii)
RXJ1806.4+7028| it could be an example of overluminous galaxies found in X-ray
RXJ1806.4+7028| surveys (e.g., Vikhlinin et al. 1999ApJ...520L...1V and
RXJ1806.4+7028| references therein).
RXJ1806.8+6949|This is a BL Lac in a cluster of galaxies. Redshift comes from
RXJ1806.8+6949| Falco et al. (1999PASP..111..438F).
RXJ1808.8+6634|The redshift for this source, identified as AGN1 at z=0.697,
RXJ1808.8+6634| comes from Laurent-Muehleisen et al. (1998ApJS..118..127L).
RXJ1808.8+6634| See their Table 2 for source properties.
RXJ1810.3+6328|This source, identified as AGN1 at z=0.838, has a double
RXJ1810.3+6328| morphology in X-rays. The identification of the X-ray source
RXJ1810.3+6328| given in Table 3 refers to the western lobe
RXJ1810.3+6328| (RA_2000_ = 18 10 31.1, DE_2000_ = +63 28 08, z=0.838). The
RXJ1810.3+6328| eastern lobe is an AGN1 at z=1.0907 (RA_2000_ = 18 10 16.9,
RXJ1810.3+6328| DE_2000_ = +63 29 14).
RXJ1815.4+6806|The redshift for this QSO (z=0.239) comes from Lacy et al.
RXJ1815.4+6806| (1993MNRAS.263..707L).
RXJ1821.9+6420|The identification of this source as a QSO at z=0.2970 comes
RXJ1821.9+6420| from Pravdo & Marshall (1984ApJ...281..570P; see an optical
RXJ1821.9+6420| spectrum in their Fig. 2). However, as already noted by
RXJ1821.9+6420| Hutchings & Neff (1991AJ....101.2001H, see their Fig. 1), a
RXJ1821.9+6420| cluster of galaxies for which six galaxy spectra were taken by
RXJ1821.9+6420| Schneider et al. (1992AJ....103.1047S) is present at the same
RXJ1821.9+6420| redshift as the QSO (see detailed description of this
RXJ1821.9+6420| QSO/cluster source in Wold et al., 2002MNRAS.335.1017W and
RXJ1821.9+6420| references therein). The X-ray source has the highest S/N of
RXJ1821.9+6420| the whole NEP survey, it is extremely X-ray luminous
RXJ1821.9+6420| (L_X_=5.61x10^45^erg/s), and it is also an IRAS source, as
RXJ1821.9+6420| reported by de Grijp et al. (1992A&AS...96..389D).
RXJ1826.6+6706|This source is identified with an AGN1 at z=0.287. The redshift
RXJ1826.6+6706| comes from Lacy et al. (1993MNRAS.263..707L).
RXJ1832.5+6848|This source is identified as a cluster of galaxies at z=0.205.
RXJ1832.5+6848| We took optical spectra for three galaxies and they have
RXJ1832.5+6848| concordant redshifts. The source is listed in the literature as
RXJ1832.5+6848| the radio source 7C 1832+6845, and it is identified as QSO by
RXJ1832.5+6848| Veron-Cetty & Veron (2001A&A...374...92V), and as BL Lac in the
RXJ1832.5+6848| NORAS catalog by Boehringer et al. (2000ApJS..129..435B). The
RXJ1832.5+6848| ambiguity may be due to the fact that there are two distinct
RXJ1832.5+6848| objects very closely separated (~6") at the position of the
RXJ1832.5+6848| X-ray source. The northwest object, object A, is the object we
RXJ1832.5+6848| have observed spectroscopically (RA_2000_ = 18 32 35.6,
RXJ1832.5+6848| DE_2000_ = +68 48 09, z=0.2049). It is red on the DSS, and its
RXJ1832.5+6848| spectrum shows narrow Balmer and oxygen emission lines,
RXJ1832.5+6848| consistent with an AGN2 object (unless we caught the QSO in a
RXJ1832.5+6848| quiescent state). The southeast object A1
RXJ1832.5+6848| (RA_2000_ = 18 32 36.2, DE_2000_ = +68 48 04) appears blue on
RXJ1832.5+6848| the DSS and could be the object indicated as QSO or BL Lac in
RXJ1832.5+6848| the literature. No spectrum is available for A1. A second
RXJ1832.5+6848| galaxy in the cluster (object B at RA_2000_ = 18 32 35.9,
RXJ1832.5+6848| DE_2000_ = +68 47 43, z=0.2048) also shows narrow emission
RXJ1832.5+6848| lines and it is classified as AGN2 in the cluster. The third
RXJ1832.5+6848| galaxy for which we obtained a spectrum, object C
RXJ1832.5+6848| (RA_2000_ = 18 32 35.6, DE_2000_ = +68 47 58, z=0.2054), shows
RXJ1832.5+6848| no emission lines in its spectrum.
RXJ1834.1+7057|This source is very extended in X-rays, and it is identified
RXJ1834.1+7057| with a cluster of galaxies at z=0.0803. An extraction radius of
RXJ1834.1+7057| 6.5' has been used, different from the normal 5' radius used
RXJ1834.1+7057| for the rest of the X-ray sources. The X-ray position is
RXJ1834.1+7057| centered on a bright galaxy (RA_2000_ = 18 34 08.5,
RXJ1834.1+7057| DE_2000_ = +70 57 19, m_E_=~12.5), possibly the cD, whose
RXJ1834.1+7057| redshift appears in the NORAS catalog of Boehringer et al.
RXJ1834.1+7057| (2000ApJS..129..435B) as z=0.0824. The source is in the same
RXJ1834.1+7057| region of sky as A2308, even if the Abell cluster position in
RXJ1834.1+7057| the NED database is at RA_2000_ = 18 33 33.8 and
RXJ1834.1+7057| DE_2000_ = +71 01 28. The redshift given in Table 3 has been
RXJ1834.1+7057| computed using spectra for three galaxies taken by us at the
RXJ1834.1+7057| UH 2.2m. The redshift agrees with other redshift determinations
RXJ1834.1+7057| listed in NED for A2308.
RXJ1842.5+6809|Redshift for this AGN1, z=0.4750, comes from the literature. The
RXJ1842.5+6809| QSO is listed in the catalog by Hewitt & Burbidge (Cat. VII/158
RXJ1842.5+6809| 1993ApJS...87..451H ) and in Xu et al. (1994AJ....108..395X).