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J/ApJ/554/742       Chandra Deep Survey of the HDF-N      (Hornschemeier+, 2001)

The Chandra Deep Survey of the Hubble Deep Field-North area. II. Results from the Caltech Faint Field Galaxy Redshift Survey area. Hornschemeier A.E., Brandt W.N., Garmire G.P., Schneider D.P., Barger A.J., Broos P.S., Cowie L.L., Townsley L.K., Bautz M.W., Burrows D.N., Chartas G., Feigelson E.D., Griffiths R.E., Lumb D., Nousek J.A., Ramsey L.W., Sargent W.L.W. <Astrophys. J. 554, 742 (2001)> =2001ApJ...554..742H
ADC_Keywords: X-ray sources Keywords: cosmology: observations - diffuse radiation - galaxies: active - surveys - X-rays: galaxies - X-rays: general Abstract: A deep X-ray survey of the Hubble Deep Field-North (HDF-N) and its environs is performed using data collected by the Advanced CCD Imaging Spectrometer (ACIS) on board the Chandra X-Ray Observatory. Currently a 221.9ks exposure is available, the deepest ever presented, and here we give results on X-ray sources located in the 8.6'x8.7' area covered by the Caltech Faint Field Galaxy Redshift Survey (the "Caltech area"). This area has (1) deep photometric coverage in several optical and near-infrared bands; (2) extensive coverage at radio, submillimeter, and mid-infrared wavelengths; and (3) some of the deepest and most complete spectroscopic coverage ever obtained. It is also where the X-ray data have the greatest sensitivity; the minimum detectable fluxes in the 0.5-2keV (soft) and 2-8keV (hard) bands are ∼1.3x10-16 and ∼6.5x10-16ergs/cm2/s, respectively. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 127 82 Properties of CHANDRA sources in the Caltech area table6.dat 99 83 Multiwavelength properties of the Caltech area CHANDRA sources table8.dat 62 16 CHANDRA detections of µJy Radio Sources table9.dat 61 11 CHANDRA detections of Faint ISOCAM Sources table10.dat 44 4 CHANDRA detections of very red objects (VROs)
See also: J/AJ/124/2351 : Chandra Deep Field North survey. XII (Bauer+, 2002) J/AJ/122/2810 : Chandra Deep Field North Survey. V. (Brandt+, 2001) J/A+A/375/1 : IR obs. of Chandra Deep Field + HDF-South (Saracco+, 2001) J/AJ/119/2571 : UBVRI photometry of HDF QSOs and galaxies (Vanden Berk+, 2000) J/AJ/120/2206 : NTT, HDF-S and HDF-N photometric redshifts (Fontana+, 2000) J/ApJS/127/1 : UGRK Photometry in the Hubble Deep field region (Hogg+, 2000) J/ApJ/538/29 : HDF-N Caltech faint galaxy redshift survey. X. (Cohen+, 2000) J/AJ/121/2895 : HDF-N Caltech faint galaxy redshift survey. XIII. (Cohen 2001) J/ApJ/533/611 : 1.4GHz survey in HDF region (Richards+, 2000) J/ApJ/513/34 : HDF photometric redshifts catalog (Fernandez-Soto+, 1999) Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [HBG2001] CHANDRA source number 4- 18 A15 --- CXOHDFN The CXOHDFN name (1) 20 A1 --- l_FB Limit flag on FB 21- 25 F5.1 ct FB The full (0.5-8 keV) band CTI-corrected source counts 27 A1 --- f_FB [f] Flag on FB (2) 29- 32 F4.1 ct e_FB ? Error in FB counts 34- 36 F3.1 arcsec DisHB ? Distance between the source detected in the FB and HB determined by WAVDETECT 38 A1 --- f_DisHB [e] Flag on DisHB (2) 40 A1 --- l_HB Limit flag on HB 41- 46 F6.2 ct HB The hard (2-8 keV) band CTI-corrected source counts 48 A1 --- f_HB [f] Flag on HB (2) 50- 53 F4.1 ct e_HB ? Error in HB counts 55- 58 F4.2 arcsec DisSB ? Distance between the source detected in the FB and SB determined by WAVDETECT 60 A1 --- f_DisSB [e] Flag on DisSB (2) 62 A1 --- l_SB Limit flag on SB 63- 67 F5.1 ct SB The soft (0.5-2 keV) band CTI-corrected source counts 69 A1 --- f_SB [f] Flag on SB (2) 71- 74 F4.1 ct e_SB ? Error in SB counts 76- 80 F5.1 ks Time Exposure time (3) 82 A1 --- f_Time [gh] Flag on Time (2) 84 A1 --- l_BRatio Limit flag on BRatio 85- 88 F4.2 --- BRatio ? Band ratio hard/soft (4) 90- 93 F4.2 --- E_BRatio ? Upper limit on BRatio (5) 95- 98 F4.2 --- e_BRatio ? Lower limit on BRatio (5) 100-103 F4.2 --- Gamma ? The photon index (6) 105 A1 --- f_Gamma [S] Indicates a spectroscopically confirmed star (7) 107 A1 --- l_FFB Limit flag on FFB 108-112 F5.2 10-15mW/m2 FFB Full band flux (in 10-15ergs/cm2/s) 114 A1 --- l_FHB Limit flag on FHB 115-119 F5.2 10-15mW/m2 FHB ? Hard band flux (in 10-15ergs/cm2/s) 121 A1 --- l_FSB Limit flag on FSB 122-126 F5.2 10-15mW/m2 FSB Soft band flux (in 10-15ergs/cm2/s)
Note (1): The J2000 position given in the CXOHDFN name. Note (2): Individual notes: e = Both CXOHDFN J123615.9+621515 and CXOHDFN J123621.0+621411 have >1.0'' positional offsets between the full-band and soft-band detections. These are not considered to be independent detections due to decreased positional certainty for the combination of low numbers of counts (< 10) and large off-axis angles (> 5'). For the first, the source is very hard even if the soft match is incorrect. For the second, Gamma = 1.4 is assumed regardless of the soft match due to the low number of counts. Both sources have faint (R > 24.5) optical counterparts and no measured redshifts, so none of the conclusions about their identities is compromised by a false cross-band match. CXOHDFN J123702.8+621601 has a >1.0'' offset between full-band and hard-band detections, but the hard-band source has only 6 counts and the source spectrum is soft regardless of the hard-band match. This source has a very faint optical counterpart (R ∼ 25.4) and no redshift, so its identity would not be compromised by a false cross-band match. f = WAVDETECT photometry failed, this value is from our manual photometry (see section 3.3). According to WAVDETECT, the numbers of ``detected'' counts for CXOHDFN J123640.2+621655, CXOHDFN J123657.4+621026, CXOHDFN J123703.5+621447 were 3.6, 1.9 and 3.5, respectively. For CXOHDFN J123704.8+621601, WAVDETECT photometry gave 27.8 counts, but our manual photometry found 61.4 counts. g = Source located on or near a gap between the CCDs for at least one observation. h = Source located at the edge of the ACIS field during observation 957 (see Table 1). Note (3): Source exposure times are effective exposure times taken from the appropriate location in the full-band exposure map (see section 3.2 for discussion). Note (4): Defined as the ratio of counts between the hard and soft bands. These band ratios have been corrected for the differential vignetting in the hard and soft bands. Note (5): Calculated following the "numerical method" described in section 1.7.3 of Lyons (1991, Data Analysis for Physical Science Students (Cambridge: Cambridge Univ. Press)). Note (6): Entries with values of 1.40 are assumed, since there are too few counts to determine the band ratio and then to estimate Gamma. Note (7): A kT=0.5keV thermal bremsstrahlung X-ray spectral model was assumed.
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [HBG2001] CHANDRA source number 4- 18 A15 --- CXOHDFN The CXOHDFN name (1) 20 A1 --- f_CXOHDFN [fg] Flag on CXOHDFN (2) 22 A1 --- l_Rmag 2-σ limit flag on Rmag 23- 26 F4.1 mag Rmag The R band magnitude (3) 28 A1 --- f_Rmag [i] Flag on Rmag (4) 30 A1 --- l_Imag 2-σ limit flag on Imag 31- 34 F4.1 mag Imag The I band magnitude (3) 36- 40 F5.3 --- z ? Redshift 42 A1 --- f_z [NS] Indicates object is a Northern (N) or Southern (S) object 44- 49 A6 --- r_z Reference for z (5) 51- 63 A13 --- ID Object identification (6) 65- 71 A7 --- r_ID Reference for ID (5) 73 A1 --- l_LogFB Limit flag on LogFB 74- 77 F4.1 [10-7W] LogFB ? Log of the full band X-ray luminosity in ergs/s 79 A1 --- l_LogHB Limit flag on LogHB 80- 83 F4.1 [10-7W] LogHB ? Log of the hard band X-ray luminosity in ergs/s 85 A1 --- f_LogHB [h] Flag on LogHB (2) 87 A1 --- l_LogSB Limit flag on LogSB 88- 91 F4.1 [10-7W] LogSB ? Log of the soft band X-ray luminosity in ergs/s 93 A1 --- f_LogSB [h] Flag on LogHB (2)
Note (1): The J2000 position given in the CXOHDFN name. Note (2): Individual notes: e = Luminosity is for the rest frame of the source. f = For these objects, there was an optical counterpart lying within the aperture close to the edge. We have measured the magnitudes with the aperture centered on the position of this optical source (see section 4.2 and Figure 6). CXOHDFN J123641.8+621132 is 1.4" from the galaxy center but is consistent with an apparent off-center ultraviolet bright spot (see Hornschemeier et al., 2000ApJ...541...49H). It is possible that this spot may be a background AGN. CXOHDFN J123648.0+620941 has two optical counterparts of comparable brightness within the 3.0" aperture (see Figure 6). We have measured the magnitudes of these two sources manually. See section A.2 for more discussion of this source. g = See Figure 9 for this object's spectrum. h = High-redshift objects: For soft-band fluxes, the 0.5-2keV rest frame has been redshifted out of our observed bandpass, so these luminosities are extrapolations of the power law calculated from higher energy data. For hard-band fluxes (2 cases), this object was not detected in the observed 2-8keV band but since the observed 0.5-2keV band overlaps well with the rest-frame 2-8keV band, we use the 0.5-2keV count rate to calculate the hard luminosity for this source. Note (3): Measured or calculated as described in section 4.2. Note (4): CXOHDFN J123651.7+621221 lacks an optical counterpart in our deep I-band imaging, but it does have a faint V=26.7 counterpart in the HDF-N (see Hornschemeier et al., 2000ApJ...541...49H). Note (5): Sources for redshifts and identifications: H01 = the current paper H00 = Hogg et al., 2000, Cat. J/ApJS/127/1, [HPA2000] C00 = Cohen et al. (2000, Cat. J/ApJ/538/29, [CHB2000] Liu = Liu et al. (1999AJ....118.1912L), [LPI99] B99 = Barger et al. (1999AJ....117..102B), [BCT99] FS = Fernandez-Soto et al. (1999, Cat. J/ApJ/513/34), [FLY99] D = M. Dickinson 2000, private communication R98 = Richards et al., 1998AJ....116.1039R, [RFK98] Note (6): The classification system is described in section 5.3.2. Individual objects are discussed in detail in section A.1 and A.2. SB = Starburst LL = Low-luminosity galaxy (see section 5.4) HL = High-luminosity galaxy NL = narrow-line AGN BL = broad-line AGN
Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 19 A19 --- VLA VLA object designation 20 A1 --- n_VLA [cde] Note on VLA (1) 22- 24 F3.1 arcsec Offset Offset between the radio and Chandra source positions 26- 30 F5.1 uJy S1.4GHz Flux at 1.4GHz 32 A1 --- l_Sp+Index Limit flag on Sp+Index 33- 37 F5.2 --- Sp+Index ? Radio spectral index (2) 39- 41 F3.1 arcsec theta ? Radio spatial extent (2) 43- 47 F5.3 --- z ? Redshift 49 A1 --- l_BRatio Limit flag on BRatio 50- 53 F4.2 --- BRatio ? Band ratio hard/soft X-ray 55- 57 A3 --- Class R00 classification (3) 59- 62 F4.1 [10-7W] logL0.5-8 ? log of the full 0.5-8keV luminosity
Note (1): Individual notes: c: See footnote e in Table 4 and footnote f in Table 6 about this object (CXOHDFN J123615.9+621515). d: This source was detected in neither the full nor the hard band e: This source was not detected independently in either the soft or hard bands Note (2): Radio spectral index and spatial extent determined by Richards, 2000, Cat. J/ApJ/533/611 Note (3): Richards (2000ApJ...533..611R) classification: AGN for AGN S for starburst-type U for unknown
Byte-by-byte Description of file: table9.dat
Bytes Format Units Label Explanations
1- 16 A16 --- ISOCAM ISOCAM Object designation 17 A1 --- n_ISOCAM [b] Note in ISOCAM (1) 19- 21 F3.1 arcsec Offset Offset between the infrared and Chandra source positions 23- 27 F5.3 --- z ? Redshift 28 A1 --- n_z [c] Note on z (1) 30 A1 --- l_F7um Limit flag on F7um 31- 33 I3 uJy F7um ? Flux at 7µm 35- 36 I2 uJy E_F7um ? Error on F7um (upper limit) 38- 39 I2 uJy e_F7um ? Error on F7um (lower limit) 41 A1 --- l_F15um Limit flag on F15um 42- 44 I3 uJy F15um Flux at 15µm 46- 47 I2 uJy E_F15um ? Error on F15um (upper limit) 49- 50 I2 uJy e_F15um ? Error on F15um (lower limit) 52 A1 -- l_BRatio Limit flag on BRatio 53- 56 F4.2 --- BRatio ? Band ratio hard/soft X-ray 58- 61 F4.1 [10-7W] logL0.5-8 ? log of the full 0.5-8keV lumonosity
Note (1): Individual notes: b: This source was only detected in the soft band. This luminosity is in the soft band c: This redshift is photometric (M. Dickinson 2000, priv. com.)
Byte-by-byte Description of file: table10.dat
Bytes Format Units Label Explanations
1- 16 A16 --- [HPA2000] Hogg et al., (2000, Cat. J/ApJS/127/1) source designation 18- 21 F4.2 mag R-Ks R-Ks colour index (1) 23- 27 F5.2 mag Ks Ks magnitude 29 A1 --- l_BRatio Limit flag on BRatio 30- 33 F4.2 --- BRatio Band ratio hard/soft X-ray 35- 39 F5.3 --- z ? Redshift (2) 41- 44 F4.1 [10-7W] logL2-8 ? Log of the full 2-8keV luminosity
Note (1): {R}=0.46F606W+0.54F814W-0.02mag, see Hogg et al., Cat. J/ApJS/127/1. Note (2): Redshifts from Cohen et al. (2000, Cat. J/ApJ/538/29; these were determined on the basis of a single emission line assumed to be [OII] λ3727.
History: From electronic version of the journal References: Hornschemeier et al., Paper I, 2000ApJ...541...49H, CXOHDFN JHHMMSS.s+DDMMSS
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 28-Sep-2001
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