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J/A+AS/134/221      Radio-loud ROSAT sources near NEP        (Brinkmann+, 1999)
Radio-loud ROSAT sources near the North Ecliptic Pole.
       Brinkmann W., Chester M., Kollgaard R., Feigelson E., Voges W., Hertz P.
      <Astron. Astrophys. Suppl. Ser. 134, 221 (1999)>
      =1999A&AS..134..221B
ADC_Keywords: Radio sources ; X-ray sources

Keywords: galaxies: active - clusters: general - quasars: general -
          X-rays: general - radio continuum: galaxies

Abstract:
    A deep and large-area survey of the North Ecliptic Pole region was
    made with the ROSAT All-Sky Survey and the VLA to elucidate the
    population of radio-loud extragalactic objects. A region of 29.3
    square degrees was surveyed with sensitivities around
    5x10-14erg/s/cm2 in the soft X-ray band and 1mJy at 1.5GHz.
    Optical counterparts were sought on digitized Schmidt plates from
    POSS-I and II. Seventy-four reliable RASS-VLA sources were found. The
    sample is a heterogeneous mixture of Seyfert galaxies, quasars, BL Lac
    objects, galaxy clusters and groups containing a radio galaxy. Optical
    magnitudes range from B≃14 to B>22. Three results are noteworthy:
    (1) the bimodality in the ratio of radio to optical emission seen in
    optically- and X-ray-selected AGN samples is also evident in the
    ROSAT-VLA objects; (2) X-ray and radio selection is an effective
    method for locating poor galaxy clusters and groups; and (3) a
    considerable population of optically faint but X-ray/radio-bright
    objects is present. This last group may be either distant clusters
    with radio galaxies or "red quasars".

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat       107       28   Compact X-ray/Radio Sources in the North Ecliptic
                               Pole (NEP)
table2.dat       107       46   Extended X-ray/Radio Sources in the NEP
table3.dat       107       32   Possible additional X-ray/Radio Sources in the NEP
notes.dat         80      218   Individual notes
tables.tex       184      452   LaTeX version of the tables


See also:
    J/ApJS/93/145 : Radio survey around North Ecliptic Pole (Kollgaard+, 1994)
  J/MNRAS/276/614 : Radio-optical 151MHz survey of the N. Ecl. Cap (Lacy+ 1995)


Byte-by-byte Description of file: table?.dat

   Bytes Format Units       Label    Explanations

   1- 11  A11   ---         VLA-NEP  VLA source designation (Radio data)
      12  A1    ---       m_VLA-NEP  Multiplicity index on VLA-NEP
  14- 15  I2    h           RAh      Radio right ascension (J2000)
  17- 18  I2    min         RAm      Radio right ascension (J2000)
  20- 23  F4.1  s           RAs      Radio right ascension (J2000)
      25  A1    ---         DE-      Radio declination sign (J2000)
  26- 27  I2    deg         DEd      Radio declination (J2000)
  29- 30  I2    arcmin      DEm      Radio declination (J2000)
  32- 35  F4.1  arcsec      DEs      Radio declination (J2000)
  37- 42  F6.1  mJy         S1.5GHz  ? Integrated flux density at 1.5GHz (20cm)
  44- 47  F4.1  mJy       e_S1.5GHz  ? rms uncertainty on S1.5GHz
  49- 68  A20   ----        ROSAT    RXS designation
  70- 71  I2    arcsec      Delta    Positional offset between the
                                      VLA and X-ray source
      73  A1    ---         Loc      [io] Localisation (1)
  75- 77  I3    ---         MaxLi    Likelihood value from the EXSAS processing
  79- 84  F6.1  10-14mW/m2  FX       0.1-2.4keV X-ray flux
  86- 89  F4.1  10-14mW/m2  e_FX     rms uncertainty on FX
  91- 92  A2    ---         Class    Optical morphology classification (2)
  94- 95  I2    arcsec      oRA      ? Optical minus radio positional offset
  97- 98  I2    arcsec      oDE      ? Optical minus radio positional offset
     100  A1    ---         l_Bmag   [~>] Limit flag on Bmag
 101-104  F4.1  mag         Bmag     ? Approximate B magnitude
     105  A1    ---         n_Bmag   Note on Bmag (3)
     107  A1    ---         Note     [*] Individual note detailed in notes.dat

Note (1): i: source lies in the inner 3° of the RASS NEP field
          o: source lies outer region of the RASS NEP field
Note (2): E: empty field
          F: too faint to classify
          G: galaxy
         Gp: galaxy group
          S: stellar
Note (3): The B magnitudes are derived as follow:
          A: APM object catalog
          b: COSMOS object catalog calibrated to APM magnitudes
          c: COSMOS object catalog


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

   Bytes Format Units   Label     Explanations

   1- 11  A11   ---     VLA-NEP   VLA source designation
      12  A1    ---    m_VLA-NEP  Multiplicity index on VLA-NEP
  14- 80  A67   ---     Note      Text of the note


Acknowledgements: Wolfgang Brinkmann 

(End)                                          Patricia Bauer [CDS]  01-Mar-1999