J/AJ/159/103 HSC search of SDSS and GAMA dwarf gal. mergers (Kado-Fong+, 2020)
Star formation in isolated dwarf galaxies hosting tidal debris: extending the
dwarf-dwarf merger sequence.
Kado-Fong E., Greene J.E., Greco J.P., Beaton R., Goulding A.D.,
Johnson S.D., Komiyama Y.
<Astron. J., 159, 103 (2020)>
=2020AJ....159..103K 2020AJ....159..103K
ADC_Keywords: Galaxy catalogs; Redshifts; Spectra, optical; Photometry, ugriz
Keywords: Dwarf galaxies ; Blue compact dwarf galaxies ; Galaxy mergers ;
Observational astronomy ; Star formation ; Galaxy evolution
Abstract:
Like massive galaxies, dwarf galaxies are expected to undergo major
mergers with other dwarfs. However, the end state of these mergers and
the role that merging plays in regulating dwarf star formation are
uncertain. Using imaging from the Hyper Suprime-Cam Subaru Strategic
Program, we construct a sample of dwarf-dwarf mergers and examine the
star formation and host properties of the merging systems. These
galaxies are selected via an automated detection algorithm from a
sample of 6875 spectroscopically selected isolated dwarf galaxies at
z<0.12 and log(M*/M☉)<9.6 from the Galaxy and Mass
Assembly and Sloan Digital Sky Survey spectroscopic campaigns. We find
a total tidal feature detection fraction of 3.29% (6.1% when
considering only galaxies at z<0.05). The tidal feature detection
fraction rises strongly as a function of star formation activity;
15%-20% of galaxies with extremely high Hα equivalent width
(EWHα>250Å) show signs of tidal debris. Galaxies that host
tidal debris are also systematically bluer than the average galaxy at
fixed stellar mass. These findings extend the observed dwarf-dwarf
merger sequence with a significant sample of dwarf galaxies,
indicating that star formation triggered in mergers between dwarf
galaxies continues after coalescence.
Description:
In this work we search for low-surface-brightness (LSB) tidal debris
around a sample of isolated dwarf galaxies identified in the Galaxy
and Mass Assembly (GAMA, Baldry+ 2018MNRAS.474.3875B 2018MNRAS.474.3875B) and SDSS
spectroscopic surveys (both legacy and BOSS surveys) at z<0.12 in
imaging from the wide layer of the Hyper Suprime-cam Subaru Strategic
Program (HSC-SSP).
We use the HSC S18A data release, which covers over 300deg2 on the
sky in gHSC, rHSC, and iHSC.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 236 6875 The Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP)
dwarf-dwarf merger catalog (and non-detections)
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See also:
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
J/A+A/373/24 : Blue compact galaxies from SBS (Pustilnik+ 2001)
J/AJ/126/1183 : Major galaxy mergers at z≲3 (Conselice+, 2003)
J/AJ/130/1516 : MCG pairs and triples of galaxies (De Propris+, 2005)
J/ApJ/685/235 : Host and companion galaxies in the SDSS (Patton+, 2008)
J/ApJ/692/511 : Mergers of luminous early-type galaxies (Wen+, 2009)
J/MNRAS/413/971 : Galaxy And Mass Assembly (GAMA) DR1 (Driver+, 2011)
J/ApJ/765/28 : CFHTLS galaxies with faint tidal features (Atkinson+, 2013)
J/AJ/148/137 : Merging galaxies in COSMOS to z∼1 (Lackner+, 2014)
J/MNRAS/452/2087 : Galaxy And Mass Assembly (GAMA): DR2 (Liske+, 2015)
J/ApJ/824/86 : The BOSS emission-line lens survey. III. (Shu+, 2016)
J/ApJ/829/78 : Dust properties major-merger galaxy pairs (Domingue+, 2016)
J/MNRAS/464/3882 : Mergers and galaxy-galaxy interactions (Weston+, 2017)
J/ApJ/855/49 : ALMA astrochemical obs. of merger NGC 3256 (Harada+, 2018)
J/ApJ/857/104 : Low surface brightness galaxies from HSC-SSP (Greco+, 2018)
J/ApJ/857/144 : Tidal features RESOLVE survey & DECaLS images (Hood+,2018)
J/ApJS/237/36 : Merging dwarf galaxies in the local universe (Paudel+, 2018)
J/A+A/631/A87 : Close pairs of galaxies in MUSE Deep Fields (Ventou+, 2019)
http://skyserver.sdss.org/dr14 : SDSS DR14 home page
http://www.gama-survey.org/ : Galaxy And Mass Assembly (GAMA) home page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- ID [466/4584290] HSC catalog spectroscopic ID
9- 18 A10 --- SDSSDR SDSS release: "SDSS-DR12-" (Cat. V/147)
or "SDSS-DR14-"
19- 37 I19 --- objID ? SDSS spectroscopic ObjID
39- 47 A9 --- --- [GAMA-DR2-]
48- 53 I6 --- GAMA ? GAMA-DR2 spectroscopic ID (1)
55- 81 A27 --- OName Other name(s)
83- 90 F8.6 arcsec Sep [0.001/1] Difference in position between
HSC object and original spectroscopic
source
92-101 F10.6 deg RAdeg [0.86/360] Right ascension (J2000)
103-111 F9.6 deg DEdeg [-2.5/53] Declination (J2000)
113-118 F6.4 --- zsp [0.01/0.13] Spectroscopic redshift
120-126 F7.3 [Msun] logM* [7/9.6]?=-99 Logarithm of stellar mass
128-134 F7.3 mag g-i [-3/2.9]?=-99 SDSS (g-i) color index
derived from Petrosian magnitudes
136-143 F8.2 0.1nm EWHa [-1364/1961]?=-99 Hα equivalent
width in Angstroms
145-152 F8.2 10-19W/m2/nm FHa [-14/90763]?=-99 Hα flux in
10-17erg/s/cm2/Å
154-161 F8.2 10-19W/m2/nm e_FHa [0/94620]?=-99 Error in FHa
163-167 A5 --- InAuto [True Flase] Automated low surface
brightness debris found?
169-173 A5 --- InVis [True False] Automated debris visually
confirmed as merger debris?
175-236 A62 --- Notes Additional notes on source
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Note (1): From Liske+, 2015, J/MNRAS/452/2087 ( in Simbad).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix, 24-Apr-2020