J/ApJ/724/L176 MgII absorbing gas around galaxies (Chen+, 2010)
What determines the incidence and extent of Mg II absorbing gas around galaxies?
Chen H.-W., Wild V., Tinker J.L., Gauthier J.-R., Helsby J.E.,
Shectman S.A., Thompson I.B.
<Astrophys. J., 724, L176-L182 (2010)>
=2010ApJ...724L.176C 2010ApJ...724L.176C
ADC_Keywords: Equivalent widths ; Galaxies, spectra ; Redshifts ; QSOs
Keywords: cosmology: observations - galaxies: halos - intergalactic medium -
quasars: absorption lines
Abstract:
We study the connections between ongoing star formation, galaxy mass,
and extended halo gas, in order to distinguish between
starburst-driven outflows and infalling clouds that produce the
majority of observed MgII absorbers at large galactic radii
(≳10h-1kpc) and to gain insights into halo gas contents around
galaxies. We present new measurements of total stellar mass (Mstar),
Hα emission line strength (EW(Hα)), and specific star
formation rate (sSFR) for the 94 galaxies described by Chen et al.'s
2010 paper (Cat. J/ApJ/714/1521).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 65 94 Summary of additional galaxy properties in
Chen et al. (2010, Cat. J/ApJ/714/1521)
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See also:
II/314 : UKIDSS-DR8 LAS, GCS and DXS Surveys (Lawrence+ 2012)
II/306 : The SDSS Photometric Catalog, Release 8 (Adelman-McCarthy+, 2011)
J/ApJ/714/1521 : Spectroscopy of galaxies around distant QSOs (Chen+, 2010)
J/ApJ/698/819 : MgII and LRGs cross-correlation analysis (Lundgren+, 2009)
J/ApJ/636/610 : Damped Lyα systems at z<1.65 (Rao+, 2006)
J/MNRAS/354/L25 : MgII absorbers in SDSS QSOs (Bouche+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Set [Gr ] "Gr" for "Group" galaxies environment
4- 8 A5 --- Idset [SDSSJ/SSGAL] SDSSJ or SSGAL
9- 27 A19 --- ID Galaxy identification (HHMMSS.ss+DDMMSS.ss)
28 A1 --- f_ID [a] Flag on ID (1)
30- 35 F6.4 --- zsp Spectroscopic redshift
37- 40 F4.1 [Msun] logM* ? Log of total stellar mass (in units of
h-2Msun, h=Ho/100km.s-1.Mpc-1)
42- 44 F3.1 [Msun] e_logM* ? logM* uncertainty
46- 50 F5.1 [yr-1] logsSFR ? Log of specific star formation rate
52- 54 F3.1 [yr-1] e_logsSFR ? logsSFR uncertainty
56 A1 --- l_EW Limit flag on EW (2)
57- 61 F5.1 0.1nm EW ?=- Hα equivalent width (2)
63- 65 F3.1 0.1nm e_EW ? EW uncertainty
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Note (1): SDSSJ125737.93+144802.20 is a broad-line active galactic nucleus;
SSGAL090519.72+084914.02 is heavily blended with the background QSO in
the SDSS images; and
SDSSJ091845.70+060220.57 is found in the QSO host environment.
We therefore do not have constraints for their stellar mass or sSFR.
Note (2): No detections are expressed as 2σ upper limits to the underlying
emission line strength of warm interstellar medium. Galaxies with no
spectral coverage of the Hα emission are indicated with "---".
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 06-Aug-2012