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J/MNRAS/323/757     Deep X-Ray Radio Blazar Survey (DXRBS). II.   (Landt+, 2001)
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
ADC_Keywords: QSOs ; BL Lac objects ; Surveys ; X-ray sources ; Radio sources

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 (αr≤0.70, where Sν~ν-α).
    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
    (αr≤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/cm2/s, DXRBS is the faintest and largest flat-spectrum
    radio sample with nearly complete (∼85 per cent) identification.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table4.dat        93      127   Positional information
table5.dat       107      127   Object properties
notes.dat         89      122   Individual notes


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

   Bytes Format Units     Label     Explanations

   1-  3  A3    ---       ---       [WGA]
   4- 15  A12   ---       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    ---       Not4      [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


Byte-by-byte Description of file: table5.dat

   Bytes Format Units   Label     Explanations

       1  A1    ---     Note      [*] *: Source does not meet strict DXRBS
                                          selection criteria
   2-  4  A3    ---     ---       [WGA]
   5- 16  A12   ---     1WGA      WGACAT designation
      17  A1    ---     Not5      [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     ? Bj (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     Classification (2)
  90- 94  F5.3  ---     z         ? Redshift
  96-100  F5.3  ---     e_z       ? rms uncertainty on z
     101  A1    ---     u_z       [?] ?: unknown redshift

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.
Note (2): Classes are as follows:
   BL Lac = BL Lac class (a sub-class of blazars)
     FSRQ = flat-spectrum radio quasar (a sub-class of blazars)
     SSRQ = steep-spectrum radio quasar
     NLRG = narrow-line radio galaxy


Byte-by-byte Description of file: notes.dat

   Bytes Format Units   Label     Explanations

   1-  3  A3    ---     ---       [WGA]
   4- 15  A12   ---     1WGA      WGACAT designation
  17- 89  A73   ---     Note      Text of the note


History:
    From electronic version of the journal
(End)                                        Patricia Bauer [CDS]    20-Nov-2001