J/A+A/356/445 ROSAT-FIRST AGN correlation (Brinkmann+, 2000)
Radio and X-ray bright AGN: the ROSAT - FIRST correlation Brinkmann W., Laurent-Muehleisen S.A., Voges W., Siebert J., Becker R.H., Brotherton M.S., White R.L., Gregg M.D. <Astron. Astrophys. 356, 445 (2000)> =2000A&A...356..445B
ADC_Keywords: Active gal. nuclei ; X-ray sources ; Radio sources Keywords: galaxies: active - galaxies: quasars: general - X-rays: general - radio continuum: general Abstract: We present the results of a correlation of the ROSAT All-Sky Survey with the April 1997 release of the VLA 20cm FIRST (Cat. VIII/59) catalogue. We focus our analysis on the 843 X-ray sources which have unique radio counterparts. The majority of these objects (84%) have optical counterparts on the POSS 1 plates. Approximately 30% have been previously classified and we obtain new spectroscopic classifications for 85 sources by comparison with the ongoing FIRST Bright Quasar Survey and 106 additional sources from our own new spectroscopic data. Approximately 51% of the sources are presently classified, and the majority of the unclassified objects are optically faint. The newly classified sources are generally radio weak, exhibiting properties intermediate with previous samples of radio- and X-ray-selected AGN. This also holds for the subsample of 71 BL Lacs which includes many intermediate objects. The 146 quasars show no evidence for a bimodal distribution in their radio-loudness parameter, indicating that the supposed division between radio-quiet and radio-loud AGN may not be real. The X-ray and radio luminosities are correlated over two decades in radio luminosity, spanning the radio-loud and radio-quiet regimes, with radio-quiet quasars showing a linear correlation between the two luminosities. Many of the sources show peculiar or unusual properties which call for more detailed follow-up observations. We also give the X-ray and radio data for the 518 X-ray sources for which more than one radio object is found. Because of the difficulties inherent in identifying optical counterparts to these complex sources, we do not consider these data in the current analysis. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 135 843 ROSAT sources with single FIRST matches table2.dat 92 1469 ROSAT sources with multiple FIRST matches tables.tex 188 3397 LaTeX version of the tables
See also: IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999) VIII/59 : the FIRST Survey, version 1999Jul (White+ 1999) J/A+AS/110/469 : AGN from the RASS (Bade+, 1995) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 15 A15 --- RXS X-ray source ROSAT All Sky Survey designation 17- 18 I2 h RAh FIRST source right ascension (J2000) 20- 21 I2 min RAm FIRST source right ascension (J2000) 23- 27 F5.2 s RAs FIRST source right ascension (J2000) 29 A1 --- DE- FIRST source declination sign 30- 31 I2 deg DEd FIRST source declination (J2000) 33- 34 I2 arcmin DEm FIRST source declination (J2000) 36- 39 F4.1 arcsec DEs FIRST source declination (J2000) 41- 42 I2 arcsec dRX Distance between radio and X-ray source 44- 58 A15 --- Name Common name for source obtained from NED, truncated to the first 14 characters. 60- 63 A4 --- Type Type of the object (G1) 65- 67 A3 --- r_Type Reference for classification (2) 69- 73 F5.3 --- z ? Redshift 75- 81 F7.2 mJy Fr FIRST 1.4 GHz peak flux 83- 88 F6.2 10-15W/m2 Fx X-ray flux in the 0.1-2.4 keV energy range 90- 93 F4.2 10-15W/m2 e_Fx rms uncertainty on Fx 95- 98 F4.2 --- Gamma ? Power-law photon index of X-ray source (3) 100-103 F4.2 --- E_Gamma ? Error in Gamma (upper limit) 105-108 F4.2 --- e_Gamma ? Error in Gamma (lower limit) 110-114 F5.2 mag Emag ? E-magnitude of the optical counterpart (from APM) 116-117 I2 --- EType ? Value for the classification of the optical object in E-band (3) 119-122 F4.1 mag Omag ? O-magnitude of the optical counterpart (from APM) 124-125 I2 --- Otype ? Value for the classification of the optical object in O-band (4) 127-130 F4.2 mag A(E) ? Extinction correction (5) 132-135 F4.1 arcsec dRO ? Angular distance between radio and optical position
Note (2): Classification: New: objects classified with spectra taken as part of this program Smb: Simbad ned: NED W00: White et al, 2000, ApJ in press id: Becker et al, 2000, subm. to ApJ Note (3): Power-law photon index of X-ray source deduced under the assumption of Galactic absorption. If no values are given the quality of the data does not allow the determination of a meaningful spectral index. Note (4): Optical object classification: 1 for `non-stellar' -1 for `star-like' 0 for 'noise-like' -8 for `possible blend'. Note (5): See Sect. 2 of paper.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 15 A15 --- RXS X-ray source ROSAT All Sky Survey designation 17- 22 F6.2 10-15W/m2 Fx X-ray flux in the 0.1-2.4 keV energy range 24- 28 F5.3 10-15W/m2 e_Fx rms uncertainty on Fx 30- 35 A6 --- Type Type of the object (G1) 36 A1 --- l_z Limit flag on z 37- 43 F7.5 --- z ? Redshift 44 A1 --- --- [,(] 45- 51 F7.5 --- z2 ? Second estimated redshift 52- 53 A2 --- n_z2 [?) ] Uncertainty flag on z2 55- 56 I2 arcsec dRX Distance between radio and X-ray source 58- 59 I2 h RAh FIRST source right ascension (J2000) 61- 62 I2 min RAm FIRST source right ascension (J2000) 64- 68 F5.2 s RAs FIRST source right ascension (J2000) 70 A1 --- DE- FIRST source declination sign 71- 72 I2 deg DEd FIRST source declination (J2000) 74- 75 I2 arcmin DEm FIRST source declination (J2000) 77- 80 F4.1 arcsec DEs FIRST source declination (J2000) 83- 90 F8.2 mJy Fr FIRST 1.4 GHz peak flux
Global notes: Note (G1): The Object type is: QSO: object with broad (>1000km/s) lines and M_B←22.5 A: narrow line objects (<1000km/s) with [OIII]/Hβ>2.0 and/or [NII]/Hα>0.6 BA: objects with broad (>1000km/s) lines and M_B>-22.5 H: starbursts with [OIII]/Hβ<2.0 and/or [NII]/Hα<0.6 G: denote galaxies (objects with no emission lines and Ca II break contrasts >30% B: BL Lacs as defined in Laurent-Muehleisen et al., (1998ApJS..118..127L) S: stars Cl: possible clusters (based on the proximity of a known cluster). rad: cataloged radio source For previously known objects, the data found in NED were used to avoid confusion. For this reason, some objects are designated as ``Sy'', ``Irs'', ``Vis'', ``UvE'', etc.
Acknowledgements: Wolfgang Brinkmann
(End) Patricia Bauer [CDS] 02-May-2000
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