J/ApJS/224/38 SPOGS. I. SDSS Shocked POststarburst Galaxy cand. (Alatalo+, 2016)
Shocked POststarbust Galaxy Survey.
I. Candidate post-starbust galaxies with emission line ratios consistent
with shocks.
Alatalo K., Cales S.L., Rich J.A., Appleton P.N., Kewley L.J., Lacy M.,
Lanz L., Medling A.M., Nyland K.
<Astrophys. J. Suppl. Ser., 224, 38-38 (2016)>
=2016ApJS..224...38A 2016ApJS..224...38A (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; Photometry, SDSS ; Redshifts
Keywords: catalogs; galaxies: active; galaxies: evolution; galaxies: statistics
Abstract:
There are many mechanisms by which galaxies can transform from blue,
star-forming spirals, to red, quiescent early-type galaxies, but our
current census of them does not form a complete picture. Recent
observations of nearby case studies have identified a population of
galaxies that quench "quietly". Traditional poststarburst searches
seem to catch galaxies only after they have quenched and transformed,
and thus miss any objects with additional ionization mechanisms
exciting the remaining gas. The Shocked POststarburst Galaxy Survey
(SPOGS) aims to identify transforming galaxies, in which the nebular
lines are excited via shocks instead of through star formation
processes. Utilizing the Oh-Sarzi-Schawinski-Yi (OSSY,
2011ApJS..195...13O 2011ApJS..195...13O) measurements on the Sloan Digital Sky Survey Data
Release 7 catalog, we applied Balmer absorption and shock boundary
criteria to identify 1067 SPOG candidates (SPOGs*) within z=0.2.
SPOGs* represent 0.2% of the OSSY sample galaxies that exceed the
continuum signal-to-noise cut (and 0.7% of the emission line galaxy
sample). SPOGs* colors suggest that they are in an earlier phase of
transition than OSSY galaxies that meet an "E+A" selection. SPOGs*
have a 13% 1.4GHz detection rate from the Faint Images of the Radio
Sky at Twenty Centimeters Survey, higher than most other subsamples,
and comparable only to low-ionization nuclear emission line region
hosts, suggestive of the presence of active galactic nuclei (AGNs).
SPOGs* also have stronger Na i D absorption than predicted from the
stellar population, suggestive of cool gas being driven out in
galactic winds. It appears that SPOGs* represent an earlier phase in
galaxy transformation than traditionally selected poststarburst
galaxies, and that a large proportion of SPOGs* also have properties
consistent with disruption of their interstellar media, a key
component to galaxy transformation. It is likely that many of the
known pathways to transformation undergo a SPOG phase. Studying this
sample of SPOGs* further, including their morphologies, AGN
properties, and environments, has the potential for us to build a more
complete picture of the initial conditions that can lead to a galaxy
evolving.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 272 1067 Candidate Shocked POststarburst Galaxy (SPOG)
catalog
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See also:
V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
J/ApJ/800/80 : MIR properties of galaxies in A2199 at z∼0.03 (Lee+, 2015)
J/MNRAS/442/533 : Recently quenched elliptical gal. in SDSS (McIntosh+, 2014)
J/ApJS/210/3 : SDSS bulge, disk & stellar mass estimates (Mendel+, 2014)
J/A+A/562/A21 : AGN feedback from CO observations (Cicone+, 2014)
J/ApJ/777/156 : Spitzer/IRS spectra of GOALS luminous IR gal. (Inami+, 2013)
J/ApJS/208/7 : Sodium excess objects. I. SDSS-DR7 (Jeong+, 2013)
J/A+A/550/A106 : Low-velocity shocks models (Lesaffre+, 2013)
J/MNRAS/421/1569 : Properties of 18286 SDSS radio galaxies (Best+, 2012)
J/ApJ/758/1 : SDSS-Spitzer AGN properties (LaMassa+, 2012)
J/MNRAS/421/1569 : Properties of 18286 SDSS radio galaxies (Best+, 2012)
J/MNRAS/420/1684 : End of red sequence galaxies in Galaxy Zoo (Wong+, 2012)
J/MNRAS/404/1639 : MILES base models + new line index system (Vazdekis+, 2010)
J/A+A/500/947 : Spectroscopy and photometry in A2744 and A2537 (Braglia+, 2009)
J/ApJ/686/859 : Radio sources at 0.327, 1.4, 4.5, 8.5GHz (Birzan+, 2008)
J/ApJ/619/755 : Modeling starburst SEDs (Dopita+, 2005)
J/AJ/127/2002 : Star Formation Rate of NFGS galaxies (Kewley+, 2004)
J/AJ/121/66 : KISS Hα survey list 1 (Salzer+, 2001)
http://www.sdss3.org/ : SDSS-III home page
http://www.spogs.org/ : SPOGS home page
http://gem.yonsei.ac.kr/~ksoh/wordpress/ : The OSSY database
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
-------------------------------------------------------------------------------
1- 5 I5 --- Seq SPOG running index number
7- 27 A21 --- SDSS IAU identifier (JHHMMSS.ss+DDMMSS.s)
29- 34 F6.4 --- z [0.002/0.2] Spectroscopic redshift
36- 42 F7.2 mag umag [13.4/25.8]?=-666 SDSS u band dereddened
model magnitude
44- 50 F7.2 mag gmag [12.4/24.3]?=-666 SDSS g band dereddened
model magnitude
52- 58 F7.2 mag rmag [11.7/19.3]?=-666 SDSS r band dereddened
model magnitude
60- 66 F7.2 mag imag [11.3/18.7]?=-666 SDSS i band dereddened
model magnitude
68- 74 F7.2 mag zmag [10.9/18.5]?=-666 SDSS z band dereddened
model magnitude
76- 82 F7.2 mag rMag [-24/-14]?=-666 Absolute r band magnitude
84- 91 F8.3 [Msun] logM* [7/12]?=-666 Log stellar mass;
see Section 2.3
93- 96 F4.2 [10-20W/m2] logHa [1.4/3.3] Log Hα narrow line flux (2)
98-101 F4.2 [10-20W/m2] logHb [0.6/2.7] Log Hβ narrow line flux (2)
103-107 F5.3 [10-20W/m2] logOIII [0.8/3.1] Log [O III] narrow line flux (2)
109-113 F5.3 [10-20W/m2] logNII [0.9/3.2] Log [N II] narrow line flux (2)
115-119 F5.3 [10-20W/m2] logSII [0.9/2.7] Log S[II] narrow line flux (2)
121-124 F4.2 [10-20W/m2] logOI [0.6/2.3] Log [O I] narrow line flux (2)
126-203 A78 --- Object Object url link to SDSS DR9 database
205-272 A68 --- Spec Spectrum url link to SDSS DR9 database
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Note (2): In units of 1e-17erg/s/cm2.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 21-Jul-2016