SIMBAD references

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 M_Neighbor/M_Candidate <= 4 at a projected separation within d_proj <= 1500 kpc and a line-of-sight kinematic separation of Δv_LOS <= 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/R_e <= 0.5 (inner), 0.5 <= R/R_e <= 1.0 (middle), and 1.0 <= R/R_e <= 1.5 (outer), in which R_e 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 Δv_LOS <= 100 km s^–1 at d_proj <= 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 <= M_Neighbor/M_Candidate <= 4 at d_proj <= 100 kpc and Δv_LOS≤ 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.