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J/ApJ/570/100       BeppoSAX HELLAS survey. V.               (La Franca+, 2002)
The BeppoSAX High-Energy Large-Area Survey.
V. The nature of the hard X-ray source population and its evolution.
    La Franca F., Fiore F., Vignali C., Antonelli A., Comastri A., Giommi P.,
    Matt G., Molendi S., Perola G.C., Pompilio F.
   <Astrophys. J. 570, 100 (2002)>
   =2002ApJ...570..100L
ADC_Keywords: X-ray sources ; Active gal. nuclei ; QSOs ; Redshifts ;
              Spectroscopy
Mission_Name: BeppoSAX

Keywords: cosmology: observations - galaxies: active -
          galaxies: distances and redshifts - galaxies: evolution -
          quasars: general

Abstract:
    We present optical spectroscopic identifications of hard X-ray
    (5-10keV) selected sources belonging to the High-Energy Large-Area
    Survey sample obtained with BeppoSAX down to a 5-10keV flux limit of
    F(5-10kev)∼3x10-14erg/cm2/s. The sample consists of 118 sources.
    There are 25 sources that have been identified through correlations
    with catalogs of known sources. A spectroscopic identification for 49
    more has been searched for with the telescope. The results of 13
    fields were empty down to R=21. There were 37 sources identified as
    type 1 active galactic nuclei (AGNs) and nine as type 2 AGNs. The
    remaining sources are five narrow emission-line galaxies, six
    clusters, two BL Lac objects, one radio galaxy, and one star.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat        81       61   Identified hard X-ray sources in the HELLAS catalog
table4.dat        26       13   Empty fields in the HELLAS catalog
table5.dat        62       99   Emission line measurements


See also:
   J/A+A/362/799   : The BeppoSAX 2-10 keV Survey (Giommi+, 2000)
   J/MNRAS/327/771 : BeppoSAX HELLAS survey. II. (Fiore+, 2001)
   J/A+A/370/900   : BeppoSAX HELLAS survey. IV (Vignali+, 2001)
   J/MNRAS/342/575 : BeppoSAX HELLAS survey. VI. (Ciliegi+, 2003)
   J/A+A/409/79    : HELLAS2XMM survey. IV. (Fiore+, 2003)
   http://argos.mporzio.astro.it/hellas/ :
                     The High Energy Large Area Survey (HELLAS) Home Page


Table 2: Observing Log
--------------------------------------------------------------------------------
   Date                              Telescope
--------------------------------------------------------------------------------
 1998 Dec 28: 3 nights            ESO/3.6 m EFOSC2
 1999 Jun  8: 3 nights            ESO/3.6 m EFOSC2
 2000 Jan  3: 3 nights            ESO/3.6 m EFOSC2
 2000 Jul 29: 3 nights            ESO/3.6 m EFOSC2

Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   1-  2  I2    h       RAh       BeppoSax right ascension (J2000.0)
   4-  5  I2    min     RAm       BeppoSax right ascension (J2000.0)
   7- 10  F4.1  s       RAs       BeppoSax right ascension (J2000.0)
      12  A1    ---     DE-       BeppoSax Declination sign (J2000)
  13- 14  I2    deg     DEd       BeppoSax declination (J2000.0)
  16- 17  I2    arcmin  DEm       BeppoSax declination (J2000.0)
  19- 20  I2    arcsec  DEs       BeppoSax declination (J2000.0)
  23- 24  I2    h       RAoh      Optical right ascension (J2000.0)
  26- 27  I2    min     RAom      Optical right ascension (J2000.0)
  29- 32  F4.1  s       RAos      Optical right ascension (J2000.0)
      34  A1    ---     DEo-      Optical Declination sign (J2000)
  35- 36  I2    deg     DEod      Optical declination (J2000.0)
  38- 39  I2    arcmin  DEom      Optical declination (J2000.0)
  41- 42  I2    arcsec  DEos      Optical declination (J2000.0)
  44- 46  I3    arcsec  DXO       Difference between X-ray and optical positions
  48- 49  I2    arcsec  Offx      Offaxis
  51- 54  F4.1 10-16W/m2/s FX     Flux at 5-10keV
  56- 59  F4.1  mag     Rmag      ? R magnitude
  61- 72  A12   ---     Type      Spectroscopic identification
      73  A1    ---     n_Type    [de] Note on Type (1)
  75- 79  F5.3  ---     z         Redshift
      80  A1    ---     n_z       [abc] Note on Redshift (2)
      81  A1    ---     Note      [*] *: cross-correlation with existing catalogs

Note (1): Note on Type:
    d: Also possible AGN 1: Hβ has a rest frame FWHM∼1000km/s
    e: Quite a noisy spectrum. Hβ has a rest frame FWHM∼1500km/s
Note (2): Note on Redshfit:
    a: From Colafrancesco et al., 2000A&AS..144..187C
    b: From Gorosabel et al., 1998A&A...339..719G, misidentified in
       Fiore et al., 2000NewA....5..143F.
    c: Wrong coordinates and magnitudes in Fiore et al.,
       1999MNRAS.306L..55F


Byte-by-byte Description of file: table4.dat

   Bytes Format Units      Label     Explanations

   1-  2  I2    h          RAh       BeppoSax right ascension (J2000.0)
   4-  5  I2    min        RAm       BeppoSax right ascension (J2000.0)
   7- 10  F4.1  s          RAs       BeppoSax right ascension (J2000.0)
      12  A1    ---        DE-       BeppoSax Declination sign (J2000)
  13- 14  I2    deg        DEd       BeppoSax declination (J2000.0)
  16- 17  I2    arcmin     DEm       BeppoSax declination (J2000.0)
  19- 20  I2    arcsec     DEs       BeppoSax declination (J2000.0)
  23- 26  F4.2 10-16W/m2/s FX        Flux at 5-10keV


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

   Bytes Format Units   Label     Explanations

       1  A1    ---     ---       [H]
   2- 14  A13   ---     Name      HELLAS name (Hhhmmss+ddmmss)
  16- 20  F5.3  ---     z         Redshift
  22- 25  A4    ---     Type      EW, FWHM or FWZI measure (1)
  27- 31  F5.1  0.1nm   MgII      ? MgII measurement (2)
      32  A1    ---     n_MgII    [a] a: CIV line instead of MgII line
  33- 37  F5.1  0.1nm   OII       ? OII measurement (2)
  39- 43  F5.1  0.1nm   Hbeta     ? Hbeta measurement (2)
  45- 49  F5.1  0.1nm   OIII      ? OIII measurement (2)
  51- 55  F5.1  0.1nm   Ha+NII    ? Hα+NII measurement (2)
  57- 60  F4.1  0.1nm   SII       ? SII measurement (2)

Note (1): Type of measure:
    EW: Equivalent width
    FWHM: Full width half maximum
    FWZI: Full width at zero intensity
Note (2): Observed frame. Negative values correspond to absorption lines



History:
    From electronic version of the journal

References:
    Fiore et al.,    Paper I         1999MNRAS.306L..55F
    Fiore et al.,    Paper II        2001MNRAS.327..771F, Cat. J/MNRAS/327/771
    Comastri et al., Paper III       2001MNRAS.327..781C
    Vignali et al.,  Paper IV        2001A&A...370..900V, Cat. J/A+A/370/900
(End)                        James Marcout,  Patricia Bauer [CDS]    21-Jun-2002