J/ApJ/909/120 Close galaxy pairs and multiples in MaNGA (Steffen+, 2021)
SDSS-IV MaNGA: the radial profile of enhanced star formation in close galaxy
pairs.
Steffen J.L., Fu H., Comerford J.M., Dai Y.S., Feng S., Gross A.C., Xue R.
<Astrophys. J., 909, 120 (2021)>
=2021ApJ...909..120S 2021ApJ...909..120S
ADC_Keywords: Galaxies, spectra; Spectra, optical; Redshifts; Surveys
Keywords: Star formation ; Galaxy nuclei ; Galaxy interactions ;
Galaxy mergers ; Galaxy pairs
Abstract:
We compare the radial profiles of the specific star formation rate
(sSFR) in a sample of 169 star-forming galaxies in close pairs with
those of mass-matched control galaxies in the SDSS-IV MaNGA survey. We
find that the sSFR is centrally enhanced (within one effective radius)
in interacting galaxies by ∼0.3dex and that there is a weak sSFR
suppression in the outskirts of the galaxies of ∼0.1dex. We stack the
difference profiles for galaxies in five stellar-mass bins in the
range log(M/M☉)=9.0-11.5 and find that the sSFR enhancement has
no dependence on the stellar mass. The same result is obtained when
comparison galaxies are matched to each paired galaxy in both stellar
mass and redshift. In addition, we find that the sSFR enhancement is
elevated in pairs with nearly equal masses and closer projected
separations, in agreement with previous work based on single-fiber
spectroscopy. We also find that the sSFR offsets in the outskirts of
the paired galaxies are dependent on whether the galaxy is the
more-massive or less-massive companion in the pair. The more-massive
companion experiences zero to a positive sSFR enhancement, while the
less-massive companion experiences sSFR suppression in their
outskirts. Our results illustrate the complex tidal effects on star
formation in closely paired galaxies.
Description:
The Mapping Nearby Galaxies at APO (MaNGA) survey is an integral field
spectroscopic (IFS) survey at the Apache Point Observatory that uses
the SDSS 2.5m telescope along with two dual-channel BOSS spectrographs.
MaNGA captures optical spectra through 17 integral field units with
variable numbers of fibers (resolution R∼2000). As of 2020 August 24,
MaNGA has completed its observations of ∼10000 galaxies.
We use spfit (http://github.com/fuhaiastro/spfit) to model the MaNGA
data cubes. We classify galaxies in this survey as star-forming
galaxies by selecting galaxies in the blue cloud on the
color-magnitude diagram (CMD). See Section 2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 45 899 *Close galaxy pairs and multiples in MaNGA integral
field units (IFUs)
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Note on table1.dat: This table lists a total of 404 plate-IFUs that contain
close galaxy pairs and multiples in the eighth MaNGA Product Launch (MPL-8).
For each IFU, all components within 2000km/s of the primary are
listed, sorted in ascending angular distance from the primary.
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See also:
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/ApJS/196/11 : Bulge+disk decompositions of SDSS galaxies (Simard+, 2011)
J/MNRAS/466/2570 : Low ionization em.-line regions galaxies (Belfiore+, 2017)
J/AJ/154/86 : MaNGA catalog, DR15 (Wake+, 2017)
J/ApJ/901/159 : MaNGA AGNs from WISE, Swift, NVSS & FIRST (Comerford+, 2020)
J/MNRAS/492/3073 : CALIFA galaxies hosting an AGN (Lacerda+, 2020)
J/MNRAS/507/300 : Massive Compact Galaxies in MaNGA (Schnorr-Mueller+, 2021)
J/other/RAA/21.306 : Supernova host galaxies in SDSS-IV MaNGA (Zhang+, 2021)
J/A+A/659/A131 : Ionized Gas Kinematics in MaNGA AGN (Deconto-Machado+, 2022)
http://www.nsatlas.org/ : NASA-Sloan Atlas home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- PlateIFU MaNGA designation of observation
13 I1 --- m_PlateIFU [0/5] Component index (1)
15- 25 F11.7 deg RAdeg [7.4/332.84] Right Ascension (J2000)
27- 37 F11.7 deg DEdeg [-7/63.2] Declination (J2000)
39- 45 F7.5 --- z [0.0136/0.15] Spectroscopic redshift
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Note (1): Where "0" indicates the primary target of the MaNGA observation.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Aug-2022