J/ApJ/696/924 UV and X-Ray radio-quiet QSOs (Gibson+, 2009)
X-ray insights into the physics of mini-BAL quasar outflows.
Gibson R.R., Brandt W.N., Gallagher S.C., Schneider D.P.
<Astrophys. J., 696, 924-940 (2009)>
=2009ApJ...696..924G 2009ApJ...696..924G
ADC_Keywords: QSOs ; Ultraviolet ; X-ray sources
Keywords: galaxies: active - galaxies: nuclei - quasars: absorption lines -
quasars: emission lines - X-rays: general
Abstract:
We examine the ultraviolet and X-ray properties of 256 radio-quiet
Sloan Digital Sky Survey quasars (QSOs) observed in X-rays with
Chandra and/or XMM-Newton in order to study the relationship between
QSOs with broad CIV absorption lines (BALs; width>2000km/s) and those
with CIV mini-BALs (here defined to have widths of 1000-2000km/s). Our
sample includes 42 BAL and 48 mini-BAL QSOs. The relative X-ray
brightness and hard spectral slopes of the mini-BAL population are, on
average, intermediate between those of BAL and non-BAL QSOs, as might
be expected if narrower and broader absorption line outflows are
physically related. However, a significant population of mini-BALs has
outflow velocities higher than would be expected for BAL QSOs of the
same relative X-ray brightness. Consistently strong X-ray absorption
is apparently not required to accelerate at least some mini-BALs to
high outflow velocities.
Description:
We have obtained SDSS and X-ray spectra for SDSS DR5 QSOs cataloged by
Schneider et al. (2007, Cat. VII/252) which also have archived Chandra
or XMM-Newton X-ray observations publicly available as of 2007 July 26
(for Chandra) or 2007 August 22 (for XMM-Newton).
We also obtained observations of X-ray bright mini-BAL QSOs as part of
XMM-Newton AO6 observing cycle in 2007 May 20 and Aug 06. These
sources were originally identified in the catalog of Trump et al.
(2006, Cat. J/ApJS/165/1) to have broad absorption features based on
their analysis of spectra available in SDSS Data Release 3. To test
for absorption feature variability, we have also obtained Hobby-Eberly
Telescope (HET) Marcario Low Resolution Spectrograph (LRS) spectra for
these sources in 2007 Nov 21 and 2008 Mar 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 146 256 UV and X-Ray radio-quiet source properties
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See also:
B/chandra : The Chandra Archive Log (CXC, 1999-)
B/xmm : XMM-Newton Observation Log (XMM-Newton SOC, 2009)
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
J/ApJ/692/758 : BAL QSOs in SDSS-DR5 (Gibson+, 2009)
J/MNRAS/399/2231 : SDSS DR5 BALQSO catalog (Scaringi+, 2009)
J/ApJS/165/1 : BAL QSOs from SDSS DR3 (Trump+, 2006)
J/ApJ/665/990 : SDSS DR2 BAL QSOs (Ganguly+, 2007)
J/AJ/125/1711 : Broad Absorption Line Quasars from SDSS (Reichard+, 2003)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- SDSS SDSS-DR5 name (JHHMMSS.ss+DDMMSS.s)
21- 25 F5.3 --- z SDSS-DR5 redshift
27- 36 A10 --- ObsID Chandra (four-digit) or XMM (ten-digit)
observation number
38- 42 F5.1 ks ExpT Exposure time
44- 49 F6.1 km/s AI Absorption index for CIVλ1549
51- 56 F6.1 km/s BI Extended balnicity index, BI0, for CIV1549
58- 63 I6 km/s V(min) ? Outflow velocity corresponding to the
longest CIV wavelength (1)
65- 70 I6 km/s V(max) ? Outflow velocity corresponding to the
shortest CIV wavelength (1)
72- 77 F6.3 [10-7W/Hz] logLuv Log monochromatic luminosity at 2500Å
79- 82 F4.1 --- SN1700 Signal to noise ratio (2)
84 A1 --- l_logLx Limit flag on logLx
85- 90 F6.3 [10-7W/Hz] logLx Log monochromatic luminosity at 2keV
92- 96 F5.3 [10-7W/Hz] e_logLx ? logLx uncertainty (3)
98-102 F5.2 --- HR ? Hardness ratio (4)
104-107 F4.2 --- e_HR ? Error on HR computed formally
109-113 F5.2 --- Gamma ? Power-law photon index Γ
115-118 F4.2 --- e_Gamma ? Gamma uncertainty
120 A1 --- l_Aox Limit flag on Aox
121-126 F6.3 --- Aox Optical-to-X-ray spectral index
128-132 F5.3 --- e_Aox ? Aox uncertainty
134 A1 --- l_DAox Limit flag on DAox
135-140 F6.3 --- DAox Difference between measured and predicted
αox
142-146 F5.3 --- e_DAox ? DAox uncertainty
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Note (1): We define νmax as the outflow velocity corresponding to the
shortest wavelength which is identified as part of a CIV mini-BAL or
BAL trough. Similarly, νmin is the outflow velocity associated
with the longest wavelength in a trough. See section 3.3 for further
details.
Note (2): SN1700 is defined as the median of the flux divided by the
noise (as reported by the SDSS pipeline) for all spectral bins in
the 1650-1700Å region.
Note (3): Errors are estimated using the method in Section 2.2
Note (4): The hardness ratio, HR=(H-S)/(H+S) is calculated from H, the
number of X-ray counts with observed-frame energies of 2-8keV, and S,
the number of counts with observed-frame energies in the 0.5-2keV
range. See section 3.2 for further details.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 02-May-2011