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 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:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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
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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.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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
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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 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.
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Acknowledgements: Wolfgang Brinkmann
(End) Patricia Bauer [CDS] 02-May-2000