J/MNRAS/434/1765 Catalog of galaxies around PKS 0405-123 (Johnson+, 2013)
Probing the IGM-galaxy connection at z > 0.5.
II. New insights into the galaxy environments of OVI absorbers in PKS 0405-123.
Johnson S.D., Chen H.-W., Mulchaey J.S.
<Mon. Not. R. Astron. Soc., 434, 1765-1778 (2013)>
=2013MNRAS.434.1765J 2013MNRAS.434.1765J
ADC_Keywords: QSOs ; Galaxy catalogs ; Ultraviolet ; Redshifts ; Magnitudes
Keywords: surveys - galaxies: haloes - quasars: absorption lines -
galaxies: star formation
Abstract:
We present new absorption-line analysis and new galaxy survey data
obtained for the field around PKS 0405-123 at zQSO=0.57. Combining
previously known OVI absorbers with new identifications in the higher
S/N ultraviolet (UV) spectra obtained with the Cosmic Origins
Spectrograph, we have established a sample of 7 OVI absorbers and 12
individual components at z=0.0918-0.495 along the sightline towards
PKS 0405-123. We complement the available UV absorption spectra with
galaxy survey data that reach 100 percent completeness at projected
distances ρ<200kpc of the quasar sightline for galaxies as faint
as 0.1L* (0.2L*) out to redshifts of z∼0.35 (z∼0.5). The high level of
completeness achieved at faint magnitudes by our survey reveals that
OVI absorbers are closely associated with gas-rich environments
containing at least one low-mass, emission-line galaxy. An intriguing
exception is a strong OVI system at z∼0.183 that does not have a
galaxy found at ρ<4Mpc, and our survey rules out the presence of
any galaxies of L>0.04L* at ρ<250kpc and any galaxies of L>0.3L*
at ρ<1Mpc. We further examine the galactic environments of OVI
absorbers and those 'Lyα-only' absorbers with neutral hydrogen
column density log N(HI)<13.6 and no detectable OVI absorption
features. The Lyα-only absorbers serve as a control sample in
seeking the discriminating galactic features that result in the
observed Ovi absorbing gas at large galactic radii. We find a clear
distinction in the radial profiles of mean galaxy surface brightness
around different absorbers. Specifically, Ovi absorbers are found to
reside in regions of higher mean surface brightness at ρ≲500kpc
(ΔµR~+5magMpc-2 relative to the background at
ρ>500kpc), while only a mild increase in galaxy surface brightness
is seen at small ρ around Lyα-only absorbers
(ΔµR~+2magMpc-2). The additional insights gained from our
deep galaxy survey demonstrate the need to probe the galaxy
populations to low luminosities in order to better understand the
nature of the absorbing systems.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 70 2138 The photometric and spectroscopic catalog of
galaxies around PKS 0405-123
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See also:
J/ApJ/617/718 : Atomic data and EW for PKS 0405-123 (Prochaska+, 2004)
J/ApJ/636/631 : Lyman-alpha forest toward PKS 0405-123 (Williger+, 2006)
J/ApJ/643/680 : Imaging & spectroscopy around PKS 0405-123 (Prochaska+, 2006)
J/ApJ/701/1219 : PaperI. Galaxy survey in 3 QSO fields (Chen+, 2009)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- ID [226/93242] Identification number,
<[JCM2013] NNNNN> in Simbad
7 A1 --- n_ID [n] "n" if the redshift is reported for the
first time here
9- 10 I2 h RAh Right Ascension (J2000)
12- 13 I2 min RAm Right Ascension (J2000)
15- 18 F4.1 s RAs Right Ascension (J2000)
20 A1 --- DE- Declination sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 28 I2 arcsec DEs Declination (J2000)
30- 34 F5.1 arcsec Sep Angular separation between the source and
the QSO PKS 0405-123
36- 39 I4 kpc rho ?=-1 Impact parameter ρ
41- 45 F5.2 mag Rmag Observed R-band magnitude adapted from Prochaska
et al., 2004ApJ...617..718P 2004ApJ...617..718P (J/ApJ/617/718)
47- 50 F4.2 mag e_Rmag ?=9.99 rms uncertainty on Rmag
52- 58 F7.4 --- z ?=-1 Spectroscopic redshift
60 A1 --- q_z [ABCN] Redshift quality coded, A=secure (1)
62 A1 --- Type [GSQU] Object type: G=galaxy, S=Star, Q=QSO,
U=unknown
64 A1 --- Cl [EAN] Galaxy class: E=emission-line dominated,
A=emission-line denomlinatyed, N=not applicable
66- 70 F5.2 --- L/L* ?=-1 Rest-frame R-band luminosity normalized
to L* as described in the paper
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Note (1): Redshift quality code as follows:
A = secure
B = single-line
C = objects which were spectroscopically observed but with no
identifiable features
N = not observed
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History:
From electronic version of the journal
References:
Chen et al., Paper I 2009ApJ...701.1219C 2009ApJ...701.1219C, Cat. J/ApJ/701/1219
(End) Patricia Vannier [CDS] 10-Sep-2014