J/ApJ/559/654 Lyα absorption systems. V. (Chen+, 2001)
The gaseous extent of galaxies and the origin of Lyα absorption systems.
V. Optical and near-infrared photometry of lyα-absorbing galaxies at z<1.
Chen H.-W., Lanzetta K.M., Webb J.K., Barcons X.
<Astrophys. J. 559, 654 (2001)>
=2001ApJ...559..654C 2001ApJ...559..654C
ADC_Keywords: QSOs ; Redshifts ; Equivalent widths
Keywords: galaxies: evolution - galaxies: halos - galaxies: ISM -
quasars: absorption lines
Abstract:
We present results of a program to obtain and analyze HST WFPC2 images
and ground-based images of galaxies identified in an imaging and
spectroscopic survey of faint galaxies in fields of HST spectroscopic
target QSOs. Here we present the additional HST WFPC2 observations of
galaxies in 10 QSO fields that were not included in Paper I (Chen et
al., 1998, Cat. J/ApJ/498/77) and near-infrared imaging observations
of galaxies in 15 QSO fields.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
object.dat 71 20 List of all QSOs
table3.dat 110 157 Galaxies and Absorption Systems
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See also:
J/ApJ/498/77 : Lyα absorption systems. III. (Chen+, 1998)
Byte-by-byte Description of file: object.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Field Field (QSO) designation
11- 12 I2 h RAh Right ascension (J2000.0)
14- 15 I2 min RAm Right ascension (J2000.0)
17- 20 F4.1 s RAs Right ascension (J2000.0)
22 A1 --- DE- Declination sign (J2000.0)
23- 24 I2 deg DEd Declination (J2000.0)
26- 27 I2 arcmin DEm Declination (J2000.0)
29- 32 F4.1 arcsec DEs Declination (J2000.0)
34- 38 F5.3 --- zem ? Emission redshift(1)
40- 44 A5 --- Filter [F702W ] Filter (1)
46- 49 I4 s TExp ? Exposition time (1)
51- 60 A10 "YYYY/MM/DD" Date Observation date (1)
62- 71 A10 "YYYY/MM/DD" Date2 Second observation date (1)
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Note (1): Data from table1.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Field Galaxy field (QSO) name (1)
11- 15 F5.1 arcsec oRA Right Ascension offset from the QSO (1)
17- 21 F5.1 arcsec oDE Declination offset from the QSO (1)
23- 28 F6.4 --- z Galaxy redshift
30- 34 F5.1 kpc Rho Impact parameter in units of kpc/h
36- 38 F3.1 kpc DRad ? Effective disk radius in units of kpc/h
40- 42 F3.1 kpc BRad ? Effective bulge radius in units of kpc/h
44 A1 --- l_D/B Limit flag in D/B
45- 48 F4.1 --- D/B ? Disk to Bulge ratio
50- 54 F5.1 deg Alpha ? Orientation angle
56- 59 F4.1 deg Inc ? Inclination angle
61- 64 F4.2 --- b/a ? Bulge axis ratio
66- 69 F4.1 mag Wmag ? The WFPC2 apparent magnitude (F702W/F606W)
71- 74 F4.1 mag/arcsec2 SB ? Rest-frame B band mean surface brightness
76- 80 F5.1 mag BMAG ? Absolute B band magnitude minus 5*log[h]
82- 85 F4.1 mag Kmag ? The K band apparent magnitude
87- 91 F5.1 mag KMAG ? Absolute K band magnitude minus 5*log[h]
93- 98 F6.4 --- zabs ? Absorber redshift
100 A1 --- l_EWLya Limit flag on EWLya
101-104 F4.2 0.1nm EWLya ? Lyα rest-frame equivalent width (2)
106 A1 --- l_EWCIV Limit flag on EWCIV
107-110 F4.2 0.1nm EWCIV ? The C IV (1548Å) rest-frame
equivalent width (2)
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Note (1): In Simbad, objects are identified as [CLW98] HHMM+DDMM +xxxxx+yyyyy
Note (2): NULL values represent cases for which the absorption measurement
cannot be made, either because the galaxy occurs behind the QSO, the
appropriate QSO spectrum is not available or lacks sensitivity, the
spectral region containing the predicted Lyα or CIV line is
blended with other absorption lines, or a corresponding Lyα or
CIV absorption line was paired with a galaxy at a smaller impact
parameter.
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History:
From electronic version of the journal
References:
Lanzetta et al., Paper I 1995ApJ...442..538L 1995ApJ...442..538L
Lanzetta et al., Paper II 1996ApJ...456L..17L 1996ApJ...456L..17L
Chen et al., Paper III 1998ApJ...498...77C 1998ApJ...498...77C, Cat. J/ApJ/498/77
Ortiz-Gil et al., Paper IV 1999ApJ...523...72O 1999ApJ...523...72O
(End) James Marcout, Patricia Bauer [CDS] 14-Jan-2002