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J/MNRAS/351/83    Blazars equivalent widths and radio luminosity (Landt+, 2004)
A physical classification scheme for blazars.
    Landt H., Padovani P., Perlman E.S., Giommi P.
   <Mon. Not. R. Astron. Soc., 351, 83-100 (2004)>
   =2004MNRAS.351...83L
ADC_Keywords: QSOs ; BL Lac objects ; Radio sources ; Equivalent widths

Keywords: galaxies: active - BL Lacertae objects: general -
          quasars: emission lines

Abstract:
    Blazars are currently separated into BL Lacertae objects (BL Lacs) and
    flat spectrum radio quasars based on the strength of their emission
    lines. This is performed rather arbitrarily by defining a diagonal
    line in the Ca H&K break value-equivalent width plane, following
    Marcha et al. (1996MNRAS.281..425M). We readdress this problem and put
    the classification scheme for blazars on firm physical grounds. We
    study ∼100 blazars and radio galaxies from the Deep X-ray Radio Blazar
    Survey (DXRBS, Cat. J/AJ/115/1253 and J/MNRAS/323/757) and 2-Jy
    radio survey and find a significant bimodality for the narrow emission
    line [OIII]λ5007. This suggests the presence of two physically
    distinct classes of radio-loud active galactic nuclei (AGN). We show
    that all radio-loud AGN, blazars and radio galaxies, can be
    effectively separated into weak- and strong-lined sources using the
    [OIII]λ5007-[OII]λ3727 equivalent width plane. This
    plane allows one to disentangle orientation effects from intrinsic
    variations in radio-loud AGN. Based on DXRBS, the strongly beamed
    sources of the new class of weak-lined radio-loud AGN are made up of
    BL Lacs at the ∼75 per cent level, whereas those of the strong-lined
    radio-loud AGN include mostly (∼97 per cent) quasars.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat       122       24   DXRBS BL Lacs
table2.dat       122      105   DXRBS Flat Spectrum Radio Quasars FSRQ,    z≤2.2
table3.dat       122       34   DXRBS Steep Spectrum Radio Quasars (SSRQ), z≤1.2
table4.dat        66       10   DXRBS radio galaxies


See also:
           IX/31 : The WGACAT version of ROSAT sources (White+ 2000)
         VIII/52 : The MIT-Green Bank 5GHz Survey (Bennett+, 1986-91)
         VIII/38 : The Parkes-MIT-NRAO 4.85GHz (PMN) Surveys (Griffith+ 1993-96)
         III/175 : Optical spectroscopy of radio sources (Stickel+, 1989-94)
 J/AJ/115/1253   : Deep X-Ray Radio Blazar Survey (DXRBS). I. (Perlman+ 1998)
 J/MNRAS/323/757 : Deep X-Ray Radio Blazar Survey (DXRBS). II. (Landt+, 2001)


Byte-by-byte Description of file: table1.dat table2.dat table3.dat

   Bytes Format Units    Label      Explanations

   1- 17  A17   ---      Name       Object name (G1)
  18- 20  A3    ---      r_Name     Reference for emission-line data (2)
  22- 26  F5.3  ---      z          Redshift
      28  A1    ---      l_EWMgII   Limit flag on EWMgII
  29- 33  F5.1  0.1nm    EWMgII     ? MgIIλ2798 Rest frame equivalent
                                       width
      35  A1    ---     l_logLMgII  Limit flag on logLMgII
  36- 40  F5.2  [10-7W]  logLMgII   ? MgIIλ2798 line luminosity
      41  A1    ---     n_logLMgII  [*] Note on logLMgII (3)
      42  A1    ---      l_EW[OII]  Limit flag on EW[OII]
  43- 47  F5.1  0.1nm    EW[OII]    ? [O II]λ3727 rest frame equivalent
                                       width
      49  A1    ---    l_logL[OII]  Limit flag on logL[OII]
  50- 54  F5.2  [10-7W]  logL[OII]  ? [O II]λ3727 line luminosity
      56  A1    ---      l_EWHb     Limit flag on EWHb
  57- 61  F5.1  0.1nm    EWHb       ? Hβλ4861 rest frame equivalent
                                       width
      63  A1    ---      l_logLHb   Limit flag on logLHb
  64- 68  F5.2  [10-7W]  logLHb     ? Hβλ4861 line luminosity
      70  A1    ---     l_EW[OIII]  Limit flag on EW[OIII]
  71- 75  F5.1  0.1nm    EW[OIII]   ? [O III]λ5007 rest frame equivalent
                                       width
      77  A1    ---   l_logL[OIII]  Limit flag on logL[OIII]
  78- 82  F5.2  [10-7W] logL[OIII]  ? [O III]λ5007 line luminosity
      84  A1    ---      l_EWHa     Limit flag on EWHa
  85- 89  F5.1  0.1nm    EWHa       ? Hαλ6563 rest frame equivalent
                                       width
      91  A1    ---      l_logLHa   Limit flag on logLHa
  92- 96  F5.2  [10-7W]  logLHa     ? Hαλ6563 line luminosity
      98  A1    ---      l_LNLR     Limit flag on LNLR
  99-103  F5.2  [10-7W]  LNLR       ? Narrow-line region luminosity (G2)
     106  A1    ---      l_LBLR     Limit flag on LBLR
 107-111  F5.2  [10-7W]  LBLR       ? Broad-line region luminosity (G2)
     112  A1    ---      n_LBLR     [*] Note on LBLR (3)
 114-117  F4.2  ---      CaH+K      ? CaH&K break value (G3)
 119-122  F4.2  ---      e_CaH+K    ? rms uncertainty on CaH&K

Note (2): References for emission-line data are as follows:
      a = Baldwin, Wampler, & Gaskell (1989ApJ...338..630B)
      b = Richstone & Schmidt (1980ApJ...235..361R)
      c = Jackson & Browne (1991MNRAS.250..414J)
      d = Stickel, Kuehr & Fried (1993A&AS...97..483S, Cat. III/175)
      e = Lawrence et al. (1996ApJS..107..541L)
      f = Stickel, Fried & Kuehr (1989A&AS...80..103S, Cat. III/175)
      g = Jackson & Eracleous (1995MNRAS.276.1409J)
      h = Stickel & Kuehr (1993A&AS..100..395S, Cat. III/75)
      j = Wilkes (1986MNRAS.218..331W)
Note (3): *: Lower limit since flux loss due to atmospheric differential
     refraction >30 per cent.


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

   Bytes Format Units    Label      Explanations

   1- 17  A17   ---      Name       Object Name (G1)
  19- 23  F5.3  ---      z          Redshift
      25  A1    ---      l_EW[OII]  Limit flag on EW[OII]
  26- 29  F4.1  0.1nm    EW[OII]    ? [O II] rest frame equivalent width
      31  A1    ---    l_logL[OII]  Limit flag on logL[OII]
  32- 36  F5.2  [10-7W]  logL[OII]  ? [O II] line luminosity
      38  A1    ---     l_EW[OIII]  Limit flag on EW[OIII]
  39- 42  F4.1  0.1nm    EW[OIII]   ? [O III] rest frame equivalent width
      44  A1    ---   l_logL[OIII]  Limit flag on logL[OIII]
  45- 49  F5.2  [10-7W] logL[OIII]  ? [O III] line luminosity
      51  A1    ---      l_LNLR     Limit flag on LNLR
  52- 56  F5.2  [10-7W]  LNLR       Narrow-line region luminosity
  58- 61  F4.2  ---      CaH+K      ? CaH&K break value (G3)
  63- 66  F4.2  ---      e_CaH+K    ? rms uncertainty on CaH&K


Global Notes:

Note (G1): Names have been standardized at CDS,
     e.g. WGAJ was replaced by 1 WGA J.
     In table4, the name J1229.4+2711 was replaced by J1229.5+2711
Note (G2): Narrow-line region defined by Rawlings and Saunders
     (1991Natur.349..138R) as  3.*(3logL[OII] + 1.5logL[OIII]).
     The broad-line region (BLR) luminosity is the sum of measured
     luminosities in the observed broad lines, calculated following
     Celotti, Padovani & Ghisellini (1997MNRAS.286..415C)
Note (G3): the CaH&K break value is the relative difference of fluxes
     in the blue and red parts of the line (f+-f-)/f+


History:
    From electronic version of the journal -- with one modification
    in table4 (see "Note (G1)" above)
(End)                                      Patricia Vannier [CDS]    19-Jul-2004