Astrophys. J., 894, 57-57 (2020/May-1)
Environmental influences on star formation in low-mass galaxies observed by the SDSS-IV/MaNGA Survey.
SUN J., BARGER K.A., FRINCHABOY P.M. and PAN K.
Abstract (from CDS):
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 <= 1500 kpc and a line-of-sight kinematic separation of ΔvLOS <= 300 km s–1. Our control galaxies are isolated from other galaxies within a projected radius of 1500 kpc. 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 <= 100 km s–1 at dproj <= 400 kpc. 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 <= 100 kpc and ΔvLOS≤ 100kms–1, we observe an SF enhancement of f_ΔSF_=1.75±0.96 (f_ΔSF_ = [(ΣSFR/M*)Pair-(ΣSFR/M*)Control,mean]/(ΣSFR/M*)Control,mean) in their inner regions, which decreases with increasing galactic radii.
© 2020. The American Astronomical Society. All rights reserved.
Galaxy evolution - Galaxy interactions - Dwarf galaxies - Star formation
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