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J/AJ/112/62 Quasar absorption-line systems (Tanner+ 1996)
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A study of quasar absorption-line systems with IRAS
Tanner A.M., Bechtold J., Walker C.E., Black J.H., Cutri R.M.
<Astron. J. 112, 62 (1996)>
=1996AJ....112...62T (SIMBAD/NED BibCode)
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ADC_Keywords: QSOs ; Redshifts ; Spectra, infrared
Mission_Name: IRAS
Abstract:
A survey of quasar absorbers was conducted using the Infrared
Astronomical Satellite (IRAS) database. Quasars with known intervening
absorption-line systems and broad absorption line (BAL) QSOs were
selected primarily from Junkkarinen et al. (1991ApJS...77..203J). Of
the 570 quasars with IRAS data, 52 showed 3{sigma} or better
detections in at least one band in SCANPI analysis. The origin of the
IRAS flux could be from the absorption-line systems, other galaxies,
or the quasar itself. The spectral energy distributions for quasars
detected in the absorption-line sample and BAL QSOs were found to be
redder than those of two control samples which suggests that some of
the IRAS flux may arise in dust associated with the intervening
galaxies. IRAS SUPERSCANPI processing was carried out for 77 quasars
with known Mg II absorption at Zabs<1 to investigate the ensemble
far-infrared properties of these objects. SUPERSCANPI processing
evaluates the median flux for many different positions on the sky,
resulting in an improvement in the effective sensitivity. A control
sample consisting of objects with no Mg II absorption known at Zabs<1
but with the same distribution of absolute V-magnitude, Zem and
radio-loud fraction for the background quasars was also processed. The
Mg II sample was detected at 3{sigma} or better in all four IRAS bands
with a significantly larger flux than the control sample at 60{mu}m
and 100{mu}m. If this far-infrared emission is from the absorber
galaxies, then the far-infrared luminosity of the composite Mg II
absorber was found to be comparable to that of a starbursting galaxy,
although such a high star-formation rate is inconsistent with the
optical and near-infrared colors of low-redshift Mg II systems. Four
of the quasars with individual IRAS detections have intervening
galaxies identified with the Mg II absorption-lines. The spectral
energy distributions of these galaxies imply far-infrared luminosities
in excess of what Arp 220 would give at their redshifts. While all the
external evidence suggests that the detection of far-infrared emission
from the absorber sample may not be connected to the presence of the
Mg II absorber, we discuss future observations which may help explain
our results.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 32 38 Additional quasar in absorption-line (AL) sample,
not in JHB (Cat. <J/ApJS/77/203>)
table2.dat 32 34 Damped Ly{alpha} sample
table3.dat 172 46 IRAS ADDSCAN detections
table4.dat 104 6 BAL QSO's detected with IRAS ADDSCAN analysis
table5.dat 40 77 Low redshift Mg II absorption line sample
table6.dat 48 77 Control sample with no Mg II absorption for Zabs<1
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Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- QSO Quasar name
9 A1 --- r_QSO Reference (1)
11- 15 F5.3 --- zem Emission redshift
17- 21 F5.3 --- zabs ? Absorption redshift
23- 27 F5.2 mag Vmag ? V magnitude from Hewitt & Burbidge
(1993ApJS...87..451H)
29- 32 F4.2 --- RL ? Radio loudness (2)
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Note (1): a : Steidel & Sargent (1992ApJS...80....1S)
b : Aldcroft et al. (1994ApJS...93....1A)
c : Lanzetta et al. (1991ApJS...77....1L)
d : Junkkarinen et al. (1991, Cat. <J/ApJS/77/203>)
e : White et al. (1993ApJ...407..456W)
f : Turnshek et al. (1989ApJ...344..567T)
g : Wolfe et al. (1986ApJS...61..249W)
h : Francis & Hewitt (1993AJ....105.1633F)
Note (2): RL=log[f_v_(5GHz)/f_v_(V)], where f_v_(5GHz) is the radio flux density
at 5GHz and [f_v_(V) is the V band flux density, based on 5 GHz
flux densities from Veron-Cetty & Veron (1987, See Cat. VII/188)
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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- 8 A8 --- QSO Quasar name
9- 11 A3 --- Note Note (1)
13- 17 F5.3 --- zem ? Emission redshift
19- 23 F5.2 mag Vmag ? V magnitude
25- 32 F8.5 --- zabs ? Absorption redshift
34- 35 I2 h RAh Right ascension (1950.0)
37- 38 I2 min RAm Right ascension (1950.0)
40- 44 F5.2 s RAs Right ascension (1950.0)
46 A1 --- DE- Declination
47- 48 I2 deg DEd Declination (1950.0)
50- 51 I2 arcmin DEm Declination (1950.0)
53- 56 F4.1 arcsec DEs Declination (1950.0)
58 A1 --- l_S12um Limit flag on 12um
59- 63 F5.3 Jy S12um IRAS flux at 12um (2)
64- 68 F5.3 Jy e_S12um ? rms uncertainty on S12um
70 A1 --- l_S25um Limit flag on 25um
71- 75 F5.3 Jy S25um IRAS flux at 25um (2)
77- 81 F5.3 Jy e_S25um ? rms uncertainty on S25um
83 A1 --- l_S60um Limit flag on 60um (2)
84- 88 F5.3 Jy S60um IRAS flux at 60um
89- 93 F5.3 Jy e_S60um ? rms uncertainty on S60um
94 A1 --- l_S100um Limit flag on 100um (2)
95-100 F6.3 Jy S100um IRAS flux at 100um
101-104 F4.2 Jy e_S100um ? rms uncertainty on S100um
106-109 F4.2 --- RL ? Radio loudness (3)
110 A1 --- n_RL [OBj] Note on RL (3)
112-117 F6.4 --- zabs2 ? Second absorption redshift
119-124 F6.4 --- zabs3 ? Second absorption redshift
126-131 F6.4 --- zabs4 ? Second absorption redshift
133-138 F6.4 --- zabs5 ? Second absorption redshift
140-145 F6.4 --- zabs6 ? Second absorption redshift
147-152 F6.4 --- zabs7 ? Second absorption redshift
154-159 F6.4 --- zabs8 ? Second absorption redshift
161-166 F6.4 --- zabs9 ? Second absorption redshift
168-173 F6.4 --- zabs10 ? Second absorption redshift
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Note (2): 3 sigma upper limits given when not detected
Note (1): c : galaxies or quasars in vicinity visible on Palomar Sky Survey.
d : UGC 439, IRAS source is 45 arcseconds northwest of quasar.
e : bright stars nearby visible on Palomar Sky Survey.
f : IRAS source is 1 arcminute northwest of quasar.
g : IRAS source is 30 arcseconds southeast of quasar.
h : IRAS source is 1 arcminute north of quasar.
i : NGC 3067, IRAS source is 2 arcminutes southwest of quasar.
k : IRAS source is 1 arcminute south of quasar.
l : NGC 6045.
m : ESO 400-G012.
Note (3): RL=log[f_v_(5GHz)/f_v_(V)], where f_v_(5GHz) is the radio flux density
at 5GHz and [f_v_(V) is the V band flux density, based on 5 GHz
flux densities from Veron-Cetty & Veron (1987, See Cat. VII/188)
unless otherwise stated.
j : RL based on 5 GHz flux densities from Kellerman et al.
(1994AJ....108.1163K).
B : BL Lac
O : OVV
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Byte-by-byte Description of file: table5.dat table6.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- QSO Quasar name
10- 12 A3 --- n_QSO Note (1)
15- 20 F6.4 --- zem ? Emission redshift
22- 27 F6.4 --- zabs ? Absorption redshift
29- 33 F5.2 mag Vmag V magnitude
36- 40 F5.3 --- RL ? Radio loudness
42 I1 --- Ref ? References, for table6 only (2)
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Note (1): a: Objects with individual IRAS detections
b: Removed for the control list for SUPERSCANPI without
IRAS detections
Note (2): 1: Aldcroft et al. (1994ApJS...93....1A)
2: Steidel & Sargent (1992ApJS...80....1S)
3: Barthel et al. (1990A&AS...82..339B)
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History: Prepared via OCR at CDS.
In table6, for QSO 0736-0620, V=718.5 in the printed version,
we change this value in 18.5 in the electronic table
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(End) James Marcout, Patricia Bauer [CDS] 17-Jun-1997