J/ApJS/175/29 Spectroscopy of QSO pairs (Marble+, 2008)
The flux auto- and cross-correlation of the Lyα forest.
I. Spectroscopy of QSO pairs with arcminute separations and similar redshifts.
Marble A.R., Eriksen K.A., Impey C.D., Bai L., Miller L.
<Astrophys. J. Suppl. Ser., 175, 29-47 (2008)>
=2008ApJS..175...29M 2008ApJS..175...29M
ADC_Keywords: QSOs ; Spectroscopy ; Redshifts
Keywords: cosmology: observations - errata, addenda - intergalactic medium
quasars: absorption lines
Abstract:
The Lyα forest has opened a new redshift regime for cosmological
investigation. At z>2 it provides a unique probe of cosmic geometry
and an independent constraint on dark energy that is not subject to
standard candle or ruler assumptions. In Paper I of this series on
using the Lyα forest observed in pairs of QSOs for a new
application of the Alcock-Paczynski test, we present and discuss the
results of a campaign to obtain moderate-resolution spectroscopy
(FWHM∼2.5Å) of the Lyα forest in pairs of QSOs with small
redshift differences (Δz<0.25, z>2.2) and arcminute separations
(Θ<5'). This data set, composed of seven individual QSOs, 35
pairs, and one triplet, is also well suited for future investigations
of the coherence of Lyα absorbers on ∼1Mpc transverse scales and
the transverse proximity effect. We note seven revisions for
previously published QSO identifications and/or redshifts.
Description:
Optical spectroscopy was obtained in the northern and southern
hemispheres with the 6.5m MMT at Mount Hopkins, Arizona, and the twin
6.5m Magellan telescopes at Las Campanas, Chile (Clay and Baade
telescopes in 2002 and 2003 respectively). All observations were made
between 2002 April 12 and 2004 May 18.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 117 114 Sample QSOs
table4.dat 129 7 QSO catalog corrections
refs.dat 46 29 Table 2 references
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See also:
VII/248 : Quasars and Active Galactic Nuclei (12th Ed.) (Veron+ 2006)
VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004)
VII/252 : SDSS-DR5 quasar catalog (Schneider+, 2007)
II/282 : The SDSS Photometric Catalog, Release 6 (Adelman-McCarthy+, 2007)
J/A+A/296/665 : Survey of optically variables QSOs (Veron+, 1995)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- [MEI2008] QSO number
3 A1 --- n_[MEI2008] [pts] pair, triplet or single QSO(s)
5- 8 F4.2 arcmin theta ? QSO pair separation
9 A1 --- f_theta [bcde ] Flag on Theta (2)
11- 12 I2 h RAh Hour of right ascension (J2000)
14- 15 I2 min RAm Minute of right ascension (J2000)
17- 21 F5.2 s RAs Second of right ascension (J2000)
23- 24 I2 --- r_pos Reference for position
26 A1 --- DE- Declination sign (J2000)
27- 28 I2 deg DEd Degree of declination (J2000)
30- 31 I2 arcmin DEm Arcminute of declination (J2000)
33- 37 F5.2 arcsec DEs Arcsecond of declination (J2000)
39- 44 F6.4 --- z ? redshift (spectroscopic)
46- 47 I2 --- r_z ? Redshift reference
48 A1 --- n_z [f] Flag on redshift (3)
50- 55 F6.3 --- mag ? Apparent magnitude in n_mag band
57- 58 A2 --- n_mag Filter of magnitude
60- 61 I2 --- r_mag ? Magnitude reference (4)
63- 72 A10 "YYYY/MM/DD" ObsDate ? Observation date
73- 75 A3 --- Day2 Second day of observation
77- 81 A5 --- Tel Telescope used
83- 86 F4.2 0.1nm FWHM ? Spectral resolution FWHM
88- 89 I2 --- S/N ? Mean Signal/Noise ratio per pixel (5)
91-114 A24 --- OName Previously published QSO designation
116-117 I2 --- r_OName ? Alias reference
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Note (2): Flags as follows:
b = The neighboring QSO was unobserved
c = A published redshift for the neighboring QSO was incorrect
but has been updated in Veron-Cetty & Veron (2003,
Cat. VII/235, superseded by VII/248)
d = Veron-Cetty & Veron (2001, Cat. VII/224) include a nonexistent
neighboring QSO that is not included in Veron-Cetty & Veron
(2003, Cat. VII/235, superseded by VII/248))
e = The published redshift for the neighboring QSO was incorrect
Note (3): f = The Veron-Cetty & Veron (2001, Cat. VII/224) redshift for this
QSO is z=2.2, in accordance with the original sample criteria.
Note (4): Magnitude filters, according to references, as follows:
1 = Croom et al. (2004, Cat. VII/241): bj ;
4 = Zamorani et al. (1999A&A...346..731Z 1999A&A...346..731Z): Johnson B;
5 = Maza et al. (1995RMxAA..31..119M 1995RMxAA..31..119M): B;
7 = Adelman-McCarthy et al. (2006, Cat. II/267): SDSS g' PSF;
8 = Schneider et al. (2005, Cat. VII/243): SDSS g' PSF;
13 = Veron & Hawkins (1995, Cat. J/A+A/296/665): B;
17 = Sirola et al. (1998ApJ...495..659S 1998ApJ...495..659S): Gunn r;
21 = Gould et al. (1993ApJS...88...53G 1993ApJS...88...53G): V.
Note (5): in the pure Lyα forest (redward of the QSO's Lyβ/OVI
emission line)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- [MEI2008] QSO number
4- 5 I2 h RAh Hour of right ascension (J2000)
7- 8 I2 min RAm Minute of right ascension (J2000)
10- 14 F5.2 s RAs Second of right ascension (J2000)
16 I1 --- r_pos Reference for position (1)
18 A1 --- DE- Declination sign (J2000)
19- 20 I2 deg DEd Degree of declination (J2000)
22- 23 I2 arcmin DEm Arcminute of declination (J2000)
25- 29 F5.2 arcsec DEs Arcsecond of declination (J2000)
31- 36 F6.4 --- zprev Previously published incorrect redshift
38 I1 --- r_zprev ? zprev reference (1)
40- 44 F5.3 --- zprev2 ? Other previously published incorrect z
46 I1 --- r_zprev2 ? zprev2 reference (1)
48- 52 F5.3 --- z ?=- Revised redshift
54- 59 F6.4 --- e_z ? Error on z
60 A1 --- f_z [b] 'b' if object is not a QSO
62-107 A46 --- Em Emission lines used for redshift
determination (3)
109-127 A19 --- OName Previously published QSO designation
129 I1 --- r_OName Alias reference (1)
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Note (1): References as follows:
1 = 1987PhDT........11D 1987PhDT........11D, Drinkwater;
2 = 1995RMxAA..31..119M 1995RMxAA..31..119M, Maza et al.;
3 = 2006ApJS..162...38A 2006ApJS..162...38A, Adelman-McCarthy et al.; (Cat. II/267)
4 = 1985ApJS...57..523W 1985ApJS...57..523W, Weedman;
5 = 2004MNRAS.349.1397C 2004MNRAS.349.1397C, Croom et al.; (Cat. VII/241)
6 = 2006MNRAS.370.1804C 2006MNRAS.370.1804C, Coppolani et al.;
7 = 1985AJ.....90..987C 1985AJ.....90..987C, Crampton et al.;
8 = 1983ApJ...272..411G 1983ApJ...272..411G, Gaston.
Note (3): λrest(Å; Vanden Berk et al. 2001AJ....122..549V 2001AJ....122..549V):
Lyα-1216.25, Nv-1239.85, SiII-1265.22, OI/SiII-1305.42,
CII-1336.60, SiIV/OIV]-1398.33, CIV-1546.15, AlII-1856.76,
[SiIII]/FeIII-1892.64, CIII]-1907.30, MgII-2800.26,
[NeV]1-3345.39, and [NeV]2-3425.66
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode Bibcode
24- 46 A23 --- Aut Author's name
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History:
From electronic version of the journal
References:
Marble et al., Paper II. 2008ApJ...675..946M 2008ApJ...675..946M
(End) Emmanuelle Perret [CDS] 07-Jul-2009