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J/MNRAS/323/757 Deep X-Ray Radio Blazar Survey (DXRBS). II. (Landt+, 2001)
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The Deep X-Ray Radio Blazar Survey (DXRBS) - II. New identifications.
Landt H., Padovani P., Perlman E.S., Giommi P., Bignall H., Tzioumis A.
<Mon. Not. R. Astron. Soc. 323, 757 (2001)>
=2001MNRAS.323..757L (SIMBAD/NED BibCode)
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ADC_Keywords: QSOs ; BL Lac objects ; Surveys ; X-ray sources ; Radio sources
Mission_Name: ROSAT
Keywords: surveys - BL Lacertae objects: general - quasars: general -
radio continuum: galaxies - X-rays: galaxies
Abstract:
We have searched the archived, pointed ROSAT Position Sensitive
Proportional Counter data for blazars by correlating the WGACAT X-ray
data base with several publicly available radio catalogues,
restricting our candidate list to serendipitous X-ray sources with a
flat radio spectrum ({alpha}_r_<=0.70, where S_{nu}_~{nu}^-{alpha}^).
his makes up the Deep X-ray Radio Blazar Survey (DXRBS). Here we
present new identifications and spectra for 106 sources, including 86
radio-loud quasars, 11 BL Lacertae objects, and nine narrow-line radio
galaxies. Together with our previously published objects and
already-known sources, our sample now contains 298 identified objects:
234 radio-loud quasars [181 flat-spectrum quasars: FSRQ
({alpha}_r_<=0.50) and 53 steep-spectrum quasars: SSRQ], 36 BL Lacs
and 28 narrow-line radio galaxies. Redshift information is available
for 96 per cent of these. Thus our selection technique is ~90 per cent
efficient at finding radio-loud quasars and BL Lacs. Reaching 5-GHz
radio fluxes ~50mJy and 0.1-2.0keV X-ray fluxes a few
W10-14erg/cm^2^/s, DXRBS is the faintest and largest flat-spectrum
radio sample with nearly complete (~85 per cent) identification.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 93 127 Positional information
table5.dat 107 127 Object properties
notes.dat 80 122 Individual notes
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See also:
IX/31 : The WGACAT version of ROSAT sources (White+ 2000)
J/AJ/115/1253 : Deep X-Ray Radio Blazar Survey (DXRBS). I. (Perlman+ 1998)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- 1WGA WGACAT designation
17- 18 I2 h RAh WGACAT right ascension (J2000)
20- 21 I2 min RAm WGACAT right ascension (J2000)
23- 26 F4.1 s RAs WGACAT right ascension (J2000)
28 A1 --- DE- WGACAT declination sign (J2000)
29- 30 I2 deg DEd WGACAT declination (J2000)
32- 33 I2 arcmin DEm WGACAT declination (J2000)
35- 36 I2 arcsec DEs WGACAT declination (J2000)
38- 41 F4.1 arcmin W-P PSPC center offset
43- 44 I2 h RArh PNM or GB6 right ascension (J2000)
46- 47 I2 min RArm PNM or GB6 right ascension (J2000)
49- 52 F4.1 s RArs PNM or GB6 right ascension (J2000)
54 A1 --- DEr- PNM or GB6 declination sign (J2000)
55- 56 I2 deg DErd PNM or GB6 declination (J2000)
58- 59 I2 arcmin DErm PNM or GB6 declination (J2000)
61- 62 I2 arcsec DErs PNM or GB6 declination (J2000)
64- 65 I2 h RAoh Optical right ascension (J2000)
67- 68 I2 min RAom Optical right ascension (J2000)
70- 73 F4.1 s RAos Optical right ascension (J2000)
75 A1 --- DEo- Optical declination sign (J2000)
76- 77 I2 deg DEod Optical declination (J2000)
79- 80 I2 arcmin DEom Optical declination (J2000)
82- 83 I2 arcsec DEos Optical declination (J2000)
84 A1 --- n_DEos [n] Note on notes.dat file
86- 89 F4.1 arcsec X-O Offset X minus Optical positions
91- 93 F3.1 arcsec e_X-O rms uncertainty on X-O
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1 A1 --- Note [*] *: Source does not meet strict DXRBS
selection criteria
2- 16 A15 --- 1WGA WGACAT designation
17 A1 --- n_1WGA [n] n: note in notes.dat file
19- 23 F5.3 ct/s CR ROSAT count rate (1)
25- 29 F5.2 --- HR ROSAT hardness ratio (ratio between hard
(0.87-2.0keV) and medium (0.4-0.86keV) band
count rates (1)
31- 38 E8.2 mW/m2 F0.1-2keV 0.1-2keV X-ray flux (1)
40- 44 F5.3 mJy F1keV X-ray flux at 1 keV (1)
46- 50 F5.2 --- logFX/Fr Radio(6cm)-to-X-ray(0.3-3.65keV) flux
ratio (1)
52- 54 I3 mJy F6cm ? Radio flux at 6cm
56- 59 F4.2 --- Sp+Index ? radio spectral index
60 A1 --- n_Sp+Index [n] Note on Sp+Index in notes.dat file
62- 65 F4.1 mag Bjmag ? B_j_ (blue) magnitude (from COSMOS)
66 A1 --- n_Bjmag [n] Note on Bjmag in notes.dat file
68 A1 --- l_Omag Limit flag on Omag
69- 72 F4.1 mag Omag ? O-plate (blue) magnitude (from APM)
73 A1 --- n_Omag [n] Note on Omag in notes.dat file
75 A1 --- l_Emag Limit flag on Emag
76- 79 F4.1 mag Emag ? E-plate (red) magnitude (from APM)
80 A1 --- n_Emag [n] Note on Emag in notes.dat file
82- 88 A7 --- Class Classificaiton
90- 94 F5.3 --- z ? Redshift
96-100 F5.3 --- e_z ? rms uncertainty on z
101 A1 --- u_z [?] ?: unknown redshift
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Note (1): For objects observed more than once by ROSAT, we give the count rate,
hardness ratios and X-ray fluxes found in each observations.
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- 1WGA WGACAT designation
17- 89 A73 --- Note Text of the note
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History:
From electronic version of the journal
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(End) Patricia Bauer [CDS] 20-Nov-2001