J/AJ/142/122 SDSS DR7 galaxy/QSOs pairs (Cherinka+, 2011)
Ca II and Na I quasar absorption-line systems in an emission-selected sample
of SDSS DR7 Galaxy/Quasar projections. I. Sample selection.
Cherinka B., Schulte-Ladbeck R.E.
<Astron. J., 142, 122 (2011)>
=2011AJ....142..122C 2011AJ....142..122C
ADC_Keywords: Galaxy catalogs ; QSOs ; Redshifts ; Spectroscopy
Keywords: catalogs - galaxies: general - quasars: absorption lines -
quasars: individual (Ca II, Na I)
Abstract:
The aim of this project is to identify low-redshift host galaxies of
quasar absorption-line systems by selecting galaxies that are seen in
projection onto quasar sightlines. To this end, we use the Seventh
Data Release of the Sloan Digital Sky Survey to construct a parent
sample of 97489 galaxy/quasar projections at impact parameters of up
to 100 kpc to the foreground galaxy. We then search the quasar spectra
for absorption-line systems of CaII and NaI within ±500km/s1 of
the galaxy's velocity. This yields 92 CaII and 16 NaI absorption
systems.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 153 97468 Parent sample of 97468 Galaxy-Quasar pairs
table5.dat 105 110 Total absorber sample: position information
table6.dat 144 112 Total absorber sample: line measurements
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See also:
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
6- 24 A19 --- Gal Galaxy SDSS name (JHHMMSS.ss+DDMMSS.s)
26- 45 E20.15 --- zGal Galaxy SDSS redshift
47- 66 E20.15 --- e_zGal rms uncertainty on zGal
68- 71 A4 --- --- [SDSS]
73- 91 A19 --- QSO QSO SDSS name (JHHMMSS.ss+DDMMSS.s)
93- 98 F6.4 --- zQSO QSO SDSS redshift
100-109 F10.5 arcmin Scale 100kpc search radius scale
111-127 E17.12 arcmin b.a Impact parameter b in arcmin
129-140 F12.9 kpc b Impact parameter b in kpc (using H0=70,
ΩM=0.3, ΩΛ=0.7)
142 I1 --- iCa [0/1] Ca flag (inclusion "1" or exclusion "0"
due to Lyα-forest contamination)
144 I1 --- iNa [0/1] Na flag (inclusion "1" or exclusion "0"
due to Lyα-forest contamination)
146 A1 --- fCa [AQNDS-] Ca flag for absorber group for CaII (1)
148 A1 --- fNa [AQNDS-] Na flag for absorber group for NaI (1)
150 I1 --- cCa ?=- Flag for our visual classification of the
absorber or questionable candidate (2)
152-153 I2 --- cNa ?=- Flag for our visual classification of the
absorber or questionable candidate (3)
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Note (1): Flag as follows:
A = absorber candidate
Q = questionable candidate
N = non-detection
D = interloping doublet
S = removal due to sky line
Note (2): Visual classification flag for CaII as follows:
1 = Resolved doublet
2 = Single-line system (could only identify primary line)
3 = Interloping doublet system
4 = Low signal-to-noise
- = no visual classification done
Note (3): Visual classification flag for NaI as follows:
1 = Resolved doublet
2 = Blended doublet
3 = Symmetrical single-line
4 = Interloping doublet system
5 = Bad continuum
6 = Wrong doublet ratio
7 = Low signal-to-noise
8 = NaI emission lines
9 = Unknown (could not visually classify)
10 = Single-line system (could only identify primary line)
- = no visual classification done
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
6- 24 A19 --- Gal Galaxy SDSS name (JHHMMSS.ss+DDMMSS.s)
26- 32 F7.5 --- zGal Galaxy redshift
34- 40 F7.5 --- e_zGal Uncertainty in zGal
42- 44 I3 deg GLONG Galaxy Galactic longitude
46- 47 I2 deg GLATG Galaxy Galactic latitude
49- 52 A4 --- --- [SDSS]
54- 72 A19 --- QSO QSO SDSS name (JHHMMSS.ss+DDMMSS.s)
74- 79 F6.4 --- zQSO QSO redshift
80 A1 --- --- [0]
82- 84 I3 deg GLONQ QSO Galactic longitude
86- 87 I2 deg GLATQ QSO Galactic latitude
89- 93 F5.2 kpc b Impact parameter
95-100 F6.1 --- Ratio Ratio of b to r-band Petrosian radius
102-105 A4 --- Ion Absorber list identifier (1)
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Note (1): Ion refers to which line list the absorber belongs to. Absorbers
listed as NaI have the NaI doublet detected. Absorbers listed as CaII
have the CaII doublet detected. Absorbers listed as Both have at least
both the CaII K and NaI D2 lines detected.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
6- 24 A19 --- Gal Galaxy SDSS name (JHHMMSS.ss+DDMMSS.s)
26- 32 F7.5 --- zGal Galaxy redshift
34- 40 F7.5 --- e_zGal Uncertainty in zGal
42- 51 A10 --- Ion Catalog absorber belongs to (1)
53- 59 F7.1 km/s VLSR Local Standard of Rest velocity (2)
61- 64 F4.2 0.1nm rEW1 Doublet line 1 equivalent width; in Angstroms
66- 69 F4.2 0.1nm e_rEW1 Uncertainty in rEW1; in Angstroms
71- 74 F4.2 --- Sign Doublet line 1 significance (rEW1/e_rEW1)
76- 83 F8.5 --- zl1 Doublet line 1 heliocentric redshift
85- 91 F7.5 --- e_zl1 Uncertainty in zl1
93- 98 F6.1 km/s dV1 Doublet line 1 velocity offset (3)
100-104 F5.1 km/s e_dV1 Uncertainty in dV1
106-109 F4.2 0.1nm rEW2 ? Doublet line 2 equivalent width; in Angstroms
111-114 F4.2 0.1nm e_rEW2 ? Uncertainty in rEW2; in Angstroms
116-123 F8.5 --- zl2 ? Doublet line 2 heliocentric redshift
125-131 F7.5 --- e_zl2 ? Uncertainty in zl2
133-138 F6.1 km/s dV2 ? Doublet line 2 velocity offset (3)
140-144 F5.1 km/s e_dV2 ? Uncertainty in dV2
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Note (1): For blended Na I features, Line 1 reports the blended values,
while Line 2 is blank.
Note (2): Along the sightline to the quasar.
Note (3): of the line from that of the expected position.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 28-Nov-2012