J/AJ/157/148  The blueshift of the C IV broad emission line in QSOs  (Ge+, 2019)
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The blueshift of the C IV broad emission line in QSOs.
    Ge X., Zhao B.-X., Bian W.-H., Green R.F.
   <Astron. J., 157, 148-148 (2019)>
   =2019AJ....157..148G    (SIMBAD/NED BibCode)
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ADC_Keywords: QSOs ; Redshifts ; Black holes ; Spectroscopy
Keywords: black hole physics - galaxies: active - quasars: emission lines

Abstract:
    For the sample from Ge et al. (2016MNRAS.462..966G) of 87 low-z
    Palomar-Green quasi-stellar objects (QSOs) and 130 high-z QSOs (0<z<5)
    with H{beta}-based single-epoch supermassive black hole masses, we
    perform a uniform decomposition of the C IV {lambda}1549 broad-line
    profile. Based on the rest frame defined by the [O III] {lambda}5007
    narrow emission line, a medium-strong positive correlation is found
    between the C IV blueshift and the luminosity at 5100 {AA} or the
    Eddington ratio L_Bol_/L_Edd_. A medium-strong negative relationship
    is found between the C IV blueshift and C IV equivalent width. These
    results support the postulation where the radiation pressure may be
    the driver of C IV blueshift. There is a medium-strong correlation
    between the mass ratio of C IV-based to H{beta}-based M_BH_ and the
    C IV blueshift, which indicates that the bias for C IV-based M_BH_ is
    affected by the C IV profile.

Description:
      A low-z sample is adopted from the optically selected sample of
    Palomar-Green (PG) QSOs (Boroson & Green 1992ApJS...80..109B). It contains
    87 PG QSOs with 0<z<0.5 from the Bright Quasar Survey (Schmidt & Green
    1983ApJ...269..352S). The optical spectra of the 87 objects are from
    the Gold Spectrograph on the Kitt Peak National Observatory (KPNO) 2.1 m
    telescope. The resolution of the spectra is 6.5 {AA} corresponding
    to ~400 km/s. The redshift of each QSO was measured from the
    [O III] {lambda} 5007 narrow emission line except for eight QSOs with weak
    or absent [O III]. Their redshifts were measured through the H{beta} line
    (Boroson & Green 1992ApJS...80..109B). The UV spectra covering C IV
    1549{AA} of 85 PG QSOs are available in the MAST archive, 47 from the
    Hubble Space Telescope (HST), and 38 from the International Ultraviolet
    Explorer (IUE).
      Ge et al. (2016MNRAS.462..966G) collected 181 high-z QSOs with
    H{beta}-based M_BH_ from different literatures. They cross-matched the
    high-z sources with Shen et al. (2011, J/ApJS/194/45) and obtained only
    125 sources with C IV fitting data. In this paper, we use 130 out of
    181 sources where 125 objects are from Ge et al. (2016MNRAS.462..966G)
    and their UV spectra are obtained from SDSS DR7 (Abazajian et al. 2009,
    Cat. II/294; York et al. 2000AJ....120.1579Y).
      To get reliable measurements of the blueshift of the C IV line, we
    constructed a subsample from these low-z and high-z QSOs, i.e., 67 PG QSOs
    and 112 high-z QSOs.

File Summary:
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 FileName      Lrecl  Records   Explanations
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ReadMe            80        .   This file
table1.dat        64       67   A summary of Palomar-Green (PG) QSOs
table2.dat        64      112   A summary of high-z QSOs
table3.dat        94       67   A summary of the fitting results for PG QSOs
table4.dat        94      112   A summary of the fitting results for high-z QSOs
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See also:
 II/294  : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
 V/147   : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
 VII/279 : SDSS quasar catalog: twelfth data release (Paris+, 2017)
 J/ApJ/641/78     : CIV variability in 105 SDSS quasars (Wilhite+, 2006)
 J/ApJS/194/45    : QSO properties from SDSS-DR7 (Shen+, 2011)
 J/ApJ/753/125    : Near-IR spectroscopy follow-up of 60 SDSS-DR7 QSOs
                                                                   (Shen+, 2012)
 J/ApJ/806/109    : Rest-frame optical spectra of 3<z<6 QSOs (Jun+, 2015)
 J/ApJ/815/91     : z<0.16 CIV absorbers from HST/COS QSOs spectra
                                                               (Burchett+, 2015)
 J/MNRAS/465/2120 : Correcting CIV-based virial black hole masses
                                                                (Coatman+, 2017)

Byte-by-byte Description of file: table1.dat table2.dat
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   Bytes Format Units   Label  Explanations
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   1-  3  I3    ---     Seq    [1/112] Sequence number
   5- 24  A20   ---     Name   Name of QSO
      25  A1    ---   f_Name   [*] Flag on Name (1)
  27- 31  F5.3  ---     z      [0.025/4.941] Redshift (G1)
  33- 37  I5    km/s    Shift  [-2408/3212] Shift of C IV peak wavelength
                                (positive value means blueshift)
  39- 41  I3    km/s  e_Shift  [10/645] Uncertainty in Shift
  43- 48  F6.3  10-7W   L5100  [43.45/47.38] Luminosity of 5100 {AA} (in erg/s)
                                (2)
  50- 55  F6.3  Msun    MBH    [7.028/10.61] Host-corrected black hole mass (2)
  57- 62  F6.3  [-]     logER  [-1.982/0.484] Eddington ratio log(L_bol_/L_Edd_)
                                (2)
      64  A1    ---     Ref    [abcde] Reference (only in Table 2) (3)
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Note (1): Flag as follows:
  * = Observation from HST.
Note (2): Data from Ge et al. (2016MNRAS.462..966G).
Note (3): Reference as follows:
  a = Shen & Liu (2012, J/ApJ/753/125);
  b = Assef et al. (2011ApJ...742...93A);
  c = Shemmer et al. (2004ApJ...614..547S);
  d = Netzer et al. (2007ApJ...671.1256N);
  e = Jun et al. (2015, J/ApJ/806/109).
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Byte-by-byte Description of file: table3.dat table4.dat
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   Bytes Format Units   Label     Explanations
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   1-  3  I3    ---     Seq       [1/112] Sequence number
   5- 24  A20   ---     Name      Name of QSO
  26- 30  F5.3  ---     z         [0.025/4.941] Redshift (G1)
  32- 36  F5.2  10-7W   L-CIVn    [41.24/47.5] Luminosity of the narrow C IV
                                   (in erg/s)
  38- 41  F4.2  10-7W e_L-CIVn    [0.01/0.77] Uncertainty in L-CIVn (in erg/s)
  43- 46  I4    km/s    FWHM-CIVn [1000/8094] Full width at half maximum of
                                   the narrow C IV
  48- 51  I4    km/s  e_FWHM-CIVn [24/3905] Uncertainty in FWHM-CIVn
  53- 57  I5    km/s    Peak-CIVn [-1006/2905] Peak velocity of the narrow C IV
  59- 61  I3    km/s  e_Peak-CIVn [10/645] Uncertainty in Peak-CIVn
  63- 67  F5.2  10-7W   L-CIVb    [41.87/47.8] Luminosity of the broad C IV
                                   (in erg/s)
  69- 72  F4.2  10-7W e_L-CIVb    [0.01/0.93] Uncertainty in L-CIVb (in erg/s)
  74- 78  I5    km/s    FWHM-CIVb [2483/20000] Full width at half maximum of
                                   the broad C IV
  80- 84  I5    km/s  e_FWHM-CIVb [26/30749] Uncertainty in FWHM-CIVb
  86- 90  I5    km/s    Peak-CIVb [-2905/2905] Peak velocity of the broad C IV
  92- 94  I3    km/s  e_Peak-CIVb [22/962] Uncertainty in Peak-CIVb
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Global notes:
Note (G1): In Tables 1 and 3, redshifts are from Schmidt & Green
  (1983ApJ...269..352S). In Table 2, the fitting redshifts of UM667 and TON618
  are from the NASA/IPAC Extragalactic Database (http://ned.ipac.caltech.edu/).
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History:
    From electronic version of the journal

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(End)                      Tiphaine Pouvreau [CDS]                   09-Jul-2019