J/AJ/157/148 The blueshift of the C IV broad emission line in QSOs (Ge+, 2019)
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 2019AJ....157..148G (SIMBAD/NED BibCode)
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 2016MNRAS.462..966G) of 87 low-z
Palomar-Green quasi-stellar objects (QSOs) and 130 high-z QSOs (0<z<5)
with Hβ-based single-epoch supermassive black hole masses, we
perform a uniform decomposition of the C IV λ1549 broad-line
profile. Based on the rest frame defined by the [O III] λ5007
narrow emission line, a medium-strong positive correlation is found
between the C IV blueshift and the luminosity at 5100 Å or the
Eddington ratio LBol/LEdd. 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 Hβ-based MBH and the
C IV blueshift, which indicates that the bias for C IV-based MBH 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 1992ApJS...80..109B). It contains
87 PG QSOs with 0<z<0.5 from the Bright Quasar Survey (Schmidt & Green
1983ApJ...269..352S 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 Å corresponding
to ∼400 km/s. The redshift of each QSO was measured from the
[O III] λ 5007 narrow emission line except for eight QSOs with weak
or absent [O III]. Their redshifts were measured through the Hβ line
(Boroson & Green 1992ApJS...80..109B 1992ApJS...80..109B). The UV spectra covering C IV
1549Å 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 2016MNRAS.462..966G) collected 181 high-z QSOs with
Hβ-based MBH 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 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 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:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
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
--------------------------------------------------------------------------------
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
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
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] logL5100 [43.45/47.38] Log luminosity of 5100 Å
(in erg/s) (2)
50- 55 F6.3 [Msun] logMBH [7.028/10.61] Log host-corrected black hole
mass (2)
57- 62 F6.3 [-] logER [-1.982/0.484] Eddington ratio
log(Lbol/LEdd) (2)
64 A1 --- Ref [abcde] Reference (only in Table 2) (3)
--------------------------------------------------------------------------------
Note (1): Flag as follows:
* = Observation from HST.
Note (2): Data from Ge et al. (2016MNRAS.462..966G 2016MNRAS.462..966G).
Note (3): Reference as follows:
a = Shen & Liu (2012, J/ApJ/753/125);
b = Assef et al. (2011ApJ...742...93A 2011ApJ...742...93A);
c = Shemmer et al. (2004ApJ...614..547S 2004ApJ...614..547S);
d = Netzer et al. (2007ApJ...671.1256N 2007ApJ...671.1256N);
e = Jun et al. (2015, J/ApJ/806/109).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
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
--------------------------------------------------------------------------------
Global notes:
Note (G1): In Tables 1 and 3, redshifts are from Schmidt & Green
(1983ApJ...269..352S 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/).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 09-Jul-2019