J/ApJS/239/23 CIV NAL systems from SDSS-DR14 quasar spectra (Chen+, 2018)
Narrow C IV absorption lines with multi-epoch observations.
Chen Z.-F., Yao M., Pang T.-T., Yi T.-F., Lu M.-M., Liu C.-Q., Nong W.-J.,
Liang Q.-Y., Liang J.-Z., Ma S.-H., Wu L.-H., Gan Y.-Q., Zou M.-L.
<Astrophys. J. Suppl. Ser., 239, 23 (2018)>
=2018ApJS..239...23C 2018ApJS..239...23C
ADC_Keywords: QSOs; Spectra, optical; Equivalent widths; Redshifts
Keywords: catalogs ; galaxies: halos ; quasars: absorption lines ;
quasars: general
Abstract:
Using the quasar spectra from the Sloan Digital Sky Survey, all with
two-epoch to six-epoch observations, we search for
CIVλλ1548,1551 narrow absorption doublets in spectral
data from the blue wing υr=30000km/s until the red wing of
CIVλ1549 emission lines. We have obtained 21239 CIV narrow
absorption line (NAL) systems, of which 647 systems were significantly
changed on timescales from ΔMJD=0.24 to 1842.38 days at
rest-frame. Both samples of the C IV NAL systems with multi-epoch
observations and the variable C IV NAL systems are the largest ones to
date. The offset velocity distribution of the variable C IV NALs from
quasars has a peak at υr∼2000km/s and gently extends to a
larger offset velocity. There are 110 variable C IV NALs with
υr>12000km/s. In addition, about 10% intrinsic C IV NALs show
time variability on a timescale of <2000 days. We find that the
variations of C IV NALs are positively or negatively correlated with
the alternations of quasar continua. The two kinds of correlations
suggest that the variable C IV NALs included in our absorber catalog
can be classified into at least two populations: (1) highly ionized
systems that are dominated by highly ionized absorbing gas and
negatively respond to the fluctuations of quasar emissions; and (2)
lowly ionized systems that are dominated by lowly ionized absorbing
gas and positively respond to fluctuations of quasar emissions. We
also find that the absolute fractional changes in the absorption
strengths of C IV NALs are inversely correlated with absorption
strengths.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
qsos.dat 25 13736 List of quasars; table added by CDS
table1.dat 111 49986 Catalog of CIV Narrow Absorption Line systems
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See also:
II/282 : The SDSS Photometric Catalog, Release 6 (Adelman-McCarthy+, 2007)
VII/279 : SDSS quasar catalog: twelfth data release (Paris+, 2017)
J/ApJ/613/129 : Equivalent widths of QSOs (Wise+, 2004)
J/ApJS/171/1 : Census of QSOs Narrow Absorption Lines (Misawa+, 2007)
J/MNRAS/405/2302 : Improved redshifts for SDSS quasar spectra (Hewett+, 2010)
J/ApJS/199/3 : The quasars MMT-BOSS pilot survey (Ross+, 2012)
J/ApJ/777/168 : CIV and SiIV BAL troughs in SDSS (Filiz+, 2013)
J/MNRAS/434/163 : QSOs narrow absorption line variability (Hacker+, 2013)
J/ApJS/210/7 : BOSS narrow CIV absorption lines. I. zem≤2.4 (Chen+, 2014)
J/ApJS/215/12 : BOSS narrow CIV absorption lines. II. zem>2.4 (Chen+, 2014)
J/MNRAS/449/1593 : CIV absorption in BAL QSOs (Baskin+, 2015)
J/MNRAS/450/3904 : Quasars narrow absorption lines from SDSS (Chen+, 2015)
J/MNRAS/454/3962 : 188 CIV BAL QSOs from SDSS DR7 (He+, 2015)
J/ApJ/814/150 : Variability of SDSS broad absorption line QSOs (Wang+, 2015)
J/ApJ/824/130 : SDSS/BOSS/TDSS CIV BAL quasars (Grier+, 2016)
J/MNRAS/462/2980 : BOSS narrow CIV absorption lines. III. (Chen+, 2016)
J/MNRAS/462/3285 : XQ-100. X-shooter quasar spectra (Perrotta+, 2016)
J/ApJS/235/11 : Absorption features in SDSS. I. MgII doublets (Chen+, 2018)
J/ApJS/236/39 : CIV narrow ALS in SDSS-DR14 (Chen+, 2018)
J/A+A/616/A114 : CIV BAL disappearance in SDSS QSOs (De Cicco+, 2018)
Byte-by-byte Description of file: qsos.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- SDSS SDSS-DR14Q (Paris+, 2018A&A...613A..51P 2018A&A...613A..51P)
designation (HHMMSS.ss+DDMMSS.s; J2000) (G1)
20- 25 F6.4 --- zem [1.37/5.1] Emission-line redshift of
the quasar
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Pair [1/24993] Identification number
of a NAL pair
7- 24 A18 --- SDSS SDSS-DR14Q (Paris+, 2018A&A...613A..51P 2018A&A...613A..51P)
designation (HHMMSS.ss+DDMMSS.s; J2000)
(G1)
26- 30 I5 --- Plate [266/10000] Spectroscopic Plate number
32- 36 I5 --- MJD [51609/57520] Spectroscopic MJD
38- 41 I4 --- Fiber [1/1000] Spectroscopic Fiber number
43- 48 F6.4 --- zem [1.37/5.1] Emission-line redshift of
the quasar
50- 55 F6.4 --- zabs [1.32/4.7] Redshift of absorption
line system
57- 60 F4.2 0.1nm rew96 [0.03/3.9] Rest-frame equivalent width
CIVλ1548Å (1)
62- 65 F4.2 0.1nm e_rew96 [0/1.2] Uncertainty in rew96 (1)
67- 70 F4.2 0.1nm rew03 [0.03/3.4] Rest-frame equivalent width
CIVλ1551Å (1)
72- 75 F4.2 0.1nm e_rew03 [0/0.9] Uncertainty in rew03 (1)
77- 83 F7.3 10-19W/m2/nm F1350 [1.5/683] The 1350Å continuum flux (2)
85- 90 F6.3 10-19W/m2/nm e_F1350 [0.1/13] Uncertainty in F1350 (2)
92- 97 I6 km/s Vrabs [-44077/29977] Offset velocity of
the CIV NAL system (3)
99-103 I5 --- ID [1/21239] Identification number of
the CIV NAL system
105-106 I2 --- NAL [-2/2]? NAL symbol (4)
108-111 F4.1 --- SL [0/19.3]? Significance level (SL) of
the variation (5)
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Note (1): If the rest frame equivalent widths and corresponding errors of
both lines of a C IV doublet are same, these values are the 1σ upper
limits of absorption strengths and indicate that the C IV NALs are not
observed in the corresponding spectra.
Note (2): Continuum flux and flux uncertainty measured from the original
spectra of the SDSS; in 10-17erg/s/cm2/Å units
Note (3): Velocity of the CIV NAL system with respect to the quasar emission
line redshift.
Note (4): Symbol as follows:
0 = NALs with |ΔWrλ1548|<3σΔWλ1548;
-1 = weakened NALs with |ΔWrλ1548|≥3σΔWλ1548;
1 = enhanced NALs with |ΔWrλ1548|≥3σΔWλ1548;
-2 = disappeared NALs;
2 = emerged NALs.
Note (5): SL equals |ΔWrλ1548|/σΔWλ1548
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Global notes:
Note (G1): In SDSS-DR14Q (Paris+, 2018A&A...613A..51P 2018A&A...613A..51P), SDSS identifiers are
sometimes misprinted when there is a "0" in the seconds of RA and/or
DEC. For instance, here, 00486.059-010321.5 is in fact 004806.05-010321.5;
022654.44+03589.29 is in fact 022654.44+035809.2. Those identifiers, as they
are used for the coordinates of the source, have been corrected at CDS.
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 04-Feb-2019