J/MNRAS/469/323 SDSS quasars with PV broad absorption (Capellupo+, 2017)
Quasars with P V broad absorption in BOSS data release 9.
Capellupo D.M., Hamann F., Herbst H., Brandt W.N., Ge J., Paris I.,
Petitjean P., Schneider D.P., Streblyanska A., York D.
<Mon. Not. R. Astron. Soc., 469, 323-338 (2017)>
=2017MNRAS.469..323C 2017MNRAS.469..323C (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Equivalent widths
Keywords: galaxies: active - quasars: absorption lines - quasars: general
Abstract:
Broad absorption lines (BALs) found in a significant fraction of
quasar spectra identify high-velocity outflows that might be present
in all quasars and could be a major factor in feedback to galaxy
evolution. Understanding the nature of these flows requires further
constraints on their physical properties, including their column
densities, for which well-studied BALs, such as CIV
λλ1548,1551, typically provide only a lower limit
because of saturation effects. Low-abundance lines, such as PV
λλ1118,1128, indicate large column densities, implying
that outflows more powerful than measurements of CIV alone would
indicate. We search through a sample of 2694 BAL quasars from the
Sloan Digital Sky Survey III/Baryon Oscillation Spectroscopic Survey
data release 9 quasar catalogue for such absorption, and we identify
81 'definite' and 86 'probable' detections of PV broad absorption,
yielding a firm lower limit of 3.0-6.2 per cent for the incidence of
such absorption among BAL quasars. The PV-detected quasars tend to
have stronger CIV and SiIV absorption, as well as a higher incidence
of LoBAL absorption, than the overall BAL quasar population. Many of
the PV-detected quasars have CIV troughs that do not reach zero
intensity (at velocities where PV is detected), confirming that the
outflow gas only partially covers the UV continuum source. P V appears
significantly in a composite spectrum of non-PV-detected BAL quasars,
indicating that P V absorption (and large column densities) is much
more common than indicated by our search results. Our sample of PV
detections significantly increases the number of known PV detections,
providing opportunities for follow-up studies to better understand BAL
outflow energetics.
Description:
We have identified 81 'definite' and 86 'probable' detections of PV
absorption, from a parent sample of 2694 BAL quasars from the SDSS-III
BOSS DR9 quasar catalogue (Ahn et al., 2012ApJS..203...21A 2012ApJS..203...21A, Cat.
V/139) .
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 58 81 Properties of quasars with definite PV detections
tablea1.dat 58 86 Properties of quasars with 'probable' PV detections
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See also:
V/139 : The SDSS Photometric Catalog, Release 9 (Ahn, 2012)
VII/269 : SDSS Quasar Catalog, DR9Q (Paris+, 2012)
Byte-by-byte Description of file: table1.dat tablea1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- SDSS SDSS name (JHHMMSS.ss+DDMMSS.s)
21- 25 F5.3 --- zem Emission redshift
27- 30 F4.1 mag imag SDSS i magnitude
33- 38 I6 km/s BI Balnicity index
40- 43 I4 km/s e_BI rms uncertainty on BI
45- 48 F4.1 0.1nm REW(CIV) ? CIV reduced equivalent width
50- 53 F4.1 0.1nm REW(SiIV) ? SiIV reduced equivalent width
55- 58 F4.1 0.1nm REW(AlIII) ? AlIII reduced equivalent width
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 17-Mar-2020