J/ApJ/894/57 Star formation activities in MaNGA low-mass galaxies (Sun+, 2020)
Environmental influences on star formation in low-mass galaxies observed by the
SDSS-IV/MaNGA Survey.
Sun J., Barger K.A., Frinchaboy P.M., Pan K.
<Astrophys. J., 894, 57-57 (2020)>
=2020ApJ...894...57S 2020ApJ...894...57S (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra; Surveys
Keywords: Galaxy evolution; Galaxy interactions; Dwarf galaxies; Star formation
Abstract:
We explore the environmental influences on the star formation (SF) in
low-mass galaxies with stellar mass 8≤log(M*/M☉)≤10 at a
redshift of 0.01<z<0.07. We identify the neighboring galaxies for our
sample using the spectroscopically observed galaxies in the Sloan
Digital Sky Survey (SDSS). Our 287 selected pair candidates have a
neighboring galaxy with a stellar mass ratio of
MNeighbor/MCandidate≤4 at a projected separation within
dproj≤1500kpc and a line-of-sight kinematic separation of
ΔvLOS≤300km/s. Our control galaxies are isolated from other
galaxies within a projected radius of 1500kpc. All selected galaxies
in our sample are spectroscopically observed by the fourth generation
of SDSS/Mapping Nearby Galaxies at Apache Point Observatory
(SDSS-IV/MaNGA) integral field spectroscopy survey. We radially bin
our selected galaxies into three regions with a radial distance of
0≤R/Re≤0.5 (inner), 0.5≤R/Re≤1.0 (middle), and
1.0≤R/Re≤1.5 (outer), in which Re is the effective radius at
where the galaxy emit half of its light. We conclude that the SF
activities in low-mass galaxies are affected by their environmental
conditions when ΔvLOS≤100km/s at dproj≤400kpc. We use
stellar-mass-weighted SF rate surface density (ΣSFR/M*) to
describe the SF strength in each radially binned region. For the pair
candidates with 0.25≤MNeighbor/MCandidate≤4 at dproj≤100kpc
and ΔvLOS≤100km/s, we observe an SF enhancement of
fΔSF=1.75±0.96
(fΔSF=[(ΣSFR/M*)Pair-(ΣSFR/M*)Control,mean]
/(ΣSFR/M*)Control,mean) in their inner regions, which
decreases with increasing galactic radii.
Description:
MaNGA selects galaxies from the NASA-Sloan Atlas (NSA) catalog
(Blanton, M. http://nsatlas.org/data) and aims to observe 10000
galaxies with a redshift range of 0.01≤z≤0.15 and over a wavelength
range of 3600≤λ≤10300Å. These galaxies are observed with
IFUs using the SDSS 2.5m telescope at Apache Point Observatory.
The 15th data release (DR15) of SDSS (Aguado+ 2019ApJS..240...23A 2019ApJS..240...23A)
brought the 7th MaNGA Product Launch (MPL-7) to the public, which
includes 4621 spectroscopically resolved galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 124 386 Information for galaxies in our sample
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
J/A+A/517/A50 : Ages & luminosities of young SMC/LMC clusters (Glatt+, 2010)
J/AJ/143/98 : Spec. of star-forming regions in NGC 4194 (Weistrop+, 2012)
J/AJ/154/86 : MaNGA catalog, DR15 (Wake+, 2017)
J/MNRAS/476/1765 : MaNGA E and S galaxies properties (Li+, 2018)
J/MNRAS/477/4711 : Stellar angular momentum for ManGa galaxies (Graham+, 2018)
J/A+A/623/A122 : Sample of MaNGA galaxies properties (Pilyugin+, 2019)
J/ApJ/882/9 : SFR & metallicity in MaNGA gal. (Sanchez-Menguiano+, 2019)
http://www.sdss.org/ : SDSS home page
http://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- 10 A10 --- PlateIFU String combination of
plate-ifudesign in MaNGA
12- 20 A9 --- MaNGA MaNGA ID (NN-NNNNNN)
22- 30 A9 --- Category Category to which the selected
galaxy belongs
32- 36 F5.2 arcsec Re [1.16/13.4] Effective radius
derived from elliptical Petrosian
analysis
38- 41 F4.2 --- b/a [0.3/0.98] Semi-minor to
semi-major axis ratio derived from
elliptical Petrosian analysis
43- 47 F5.2 [Msun] logM [8/10] Stellar mass in logarithm
derived from K-correction fit in
the NSA catalog
49- 52 I4 kpc dproj [11/9497] Projected separation to
the nearest neighbor
54- 57 I4 km/s Vlos [0/494]?=-999 Difference in
line-of-sight velocity to the
nearest neighbor
59- 65 F7.2 --- Mratio [0/4]?=-999 Nearest neighbor to
pair candidate stellar mass ratio
67- 72 F6.4 Msun/yr/arcsec2 SFRin [0.0001/0.4] SF surface density
for the Inner region
74- 79 F6.4 Msun/yr/arcsec2 SFRmid [0.0001/0.14] SF surface density
for the Middle region
81- 86 F6.4 Msun/yr/arcsec2 SFRout [0/0.06] SF surface density for
the Outer region
88- 96 F9.4 Msun/yr SFRfiber [0.0008/2]?=-999 SFR for the
region within the 3-arcsec fiber
98- 104 A7 --- fspin Fraction of valid spaxels within
the Inner region
106- 114 A9 --- fspmid Fraction of valid spaxels within
the Middle region
116- 124 A9 --- fspout Fraction of valid spaxels within
the Outer region
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 14-Sep-2021