J/A+A/323/739 ROSAT detected quasars. II. (Brinkmann+ 1997)
Radio-loud AGN in the northern ROSAT All-Sky Survey.
II. Multi-frequency properties of unidentified sources
Brinkmann W., Siebert J., Feigelson E.D., Kollgaard R.I.,
Laurent-Muehleisen S.A., Reich W., Fuerst E., Reich P., Voges W.,
Truemper J., McMahon R.
<Astron. Astrophys. 323, 739 (1997)>
=1997A&A...323..739B 1997A&A...323..739B
ADC_Keywords: QSOs ; X-ray sources
Mission_Name: ROSAT
Keywords: galaxies: active - quasars; X-rays: general - radio sources: general
Abstract:
We present the broad band, radio - to - X-ray, properties of a large
sample of mostly previously optically unidentified radio-loud X-ray
sources from the correlation of a ROSAT All-Sky Survey source list
with the 5GHz Green Bank Survey of the northern sky (RGB sample) which
is one of the largest well-defined flux-limited surveys of AGN ever
obtained. Further, the RGB pushes 1-2 orders of magnitude deeper in
both X-ray and radio flux compared to previous unbiased wide-area AGN
surveys. Follow up VLA observations of the candidate objects yielded
positions with arcsec accuracy which were used to find optical
counterparts to the sources from digitized POSS plates. The sources
are divided into three classes according to the positional offset
between the X-ray and radio candidates and the spatial resolution of
the radio observations, reflecting the various degrees of confidence
about the correctness of the proposed association. Although the nature
of the sources as well as their redshifts remain to be determined in
spectroscopic follow up observations, the derived flux ratios lead to
the conclusion that the majority of them are quasars. Hardly any
correlations could be found between different source parameters,
possibly due to the fact that most of the objects are found in a
relatively small flux range near the sensitivity limit of the radio
catalogue. The majority of the new RGB sources have broad-band
properties between those of traditional radio-selected and X-ray
selected AGN. There is no bimodal distribution in the radio-loudness
distribution, and the traditional division between radio-quiet and
radio-loud AGN may not be warranted.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 105 813 DELTA(VLA-RASS)<40" unidentified RGB sources
table2.dat 104 303 40"<DELTA(VLA-RASS)<100" unidentified RGB sources
table3.dat 110 311 DELTA(VLA-RASS)<100" unidentified RGB sources,
low resolution data
table4.dat 93 72 Previously unidentified RGB sources: VLA empty fields
tables.tex 143 1509 LaTeX version of the table1-3
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See also:
J/A+A/319/413 : ROSAT detected quasars. I. (Brinkmann+ 1997)
Byte-by-byte Description of file: table1.dat table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- ROSAT ROSAT name
16- 17 I2 h RAh VLA right ascension (J2000.0)
19- 20 I2 min RAm VLA right ascension (J2000.0)
22- 26 F5.2 s RAs VLA right ascension (J2000.0)
27 A1 --- DE- VLA declination sign (J2000.0)
28- 29 I2 deg DEd VLA declination (J2000.0)
31- 32 I2 arcmin DEm VLA declination (J2000.0)
34- 37 F4.1 arcsec DEs VLA declination (J2000.0)
39- 40 I2 arcsec DXrad Angular separation of the VLA radio source
and the X-ray source
42- 46 F5.3 Jy fr 5GHz VLA flux density from L97 (1)
48- 53 F6.2 10-15W/m2 FX 0.1 - 2.4 keV X-ray flux
55- 58 F4.2 10-15W/m2 e_FX rms uncertainty on FX
60- 63 F4.2 --- Gamma ? X-ray photom index
66- 69 F4.2 --- e_Gamma ? Error in Gamma (lower limit)
72- 75 F4.2 --- E_Gamma ? Error in Gamma (upper limit)
77- 80 F4.1 mag Emag ? E magnitude of the closest optical
counterpart from digitized POSS plates
(blank: no plate is available)
81 A1 --- n_Emag [e] e: empty fields
82- 83 I2 --- clE ? [-1/2] Optical classification (2)
85- 88 F4.1 mag Omag ? O magnitude of the closest optical
counterpart from digitized POSS plates
(blank: no plate is available)
89 A1 --- n_Omag [e] e: empty fields
90- 91 I2 --- clO ? [-1/2] Optical classification
93- 96 F4.1 arcsec DVLAOpt ? Positional difference between the VLA
source and the optical object
98 A1 --- E [*] *: the radio source has been re-observed
with the Effelsberg telescope
(Reich et al., in prep.)
101 A1 --- Notes [ibgq] Notes (3)
103-105 A3 --- r_Notes References (4)
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Note (1): L97 : Laurent-Muehleisen S.A., Kollgaard R.I., Ryan P.J., et al.,
1997A&AS..122..235L 1997A&AS..122..235L
Note (2): -1 = stellar
0 = noise
1 = non-stellar
2 = possible blend
Note (3): Identifications along with a reference are given if the object has
been identified after the publication of Brinkmann et al.,
1995A&AS..109..147B 1995A&AS..109..147B
i = identified as AGN, but as yet no classification available
b = BL Lac object
q = quasar
g = galaxy
Note (4): References:
BA = N.Bade, private communication
HO = Hook et al. (1996MNRAS.282.1274H 1996MNRAS.282.1274H)
LG = Law-Green et al. (1995MNRAS.274..939L 1995MNRAS.274..939L)
LM = Laurent-Muehleisen (1996, PhD thesis, Penn State University)
MA = Marcha et al. (1996MNRAS.281..425M 1996MNRAS.281..425M)
NA = Nass et al. (1996A&A...309..419N 1996A&A...309..419N)
NED = Identification from NASA/IPAC extragalactic database
PE = Perlman et al. (1996ApJS..104..251P 1996ApJS..104..251P)
WA = Wagner et al. (in prep.)
ZH = Zhang et al. (in prep.)
XIE = Xie et al. (in prep.)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- ROSAT ROSAT name
16- 17 I2 h RAh X-ray ascension (J2000)
19- 20 I2 min RAm X-ray ascension (J2000)
22- 25 F4.1 s RAs X-ray ascension (J2000)
27- 28 I2 deg DEd X-ray declination (J2000)
30- 31 I2 arcmin DEm X-ray declination (J2000)
33- 34 I2 arcsec DEs X-ray declination (J2000)
36- 37 I2 arcsec DXrad Angular separation of the 87GB radio source
and the X-ray source
39- 43 F5.2 10-15W/m2 FX 0.1-2.4 keV X-ray flux
45- 48 F4.2 10-15W/m2 e_FX 1 sigma statistical error to the X-ray flux
50- 53 F4.2 --- Gamma ? X-ray photon index assuming
Galactic absorption
55- 58 F4.2 --- e_Gamma ? Photon index lower 1 sigma error
60- 63 F4.2 --- E_Gamma ? Photon index upper 1 sigma error
65- 69 F5.2 [cm-2] log(NH) log (Galactic N_H)
71- 76 F6.3 Jy F5GHz 87GB 5GHz radio flux in Jy
78- 94 A17 --- Comm Comment on possible source identification
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Acknowledgements: Joachim Siebert
Historical notes: The units of 'fr' in tables 1-3 is Jy instead of mJy.
The corrections, signaled by the author, were made on 20-Nov-1997.
(End) Patricia Bauer [CDS] 06-Feb-1997