期刊
ASTROPHYSICAL JOURNAL
卷 899, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/aba4ae
关键词
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资金
- ESO program [196.B-0578]
- European Research Council (ERC) under the Horizon 2020 research and innovation program [833824]
- ASI-INAF [2017-14-H.0]
- PRIN MIUR 2017 [20173ML3WW_001]
- INAF main-stream funding program
The study of the spatially resolved star formation rate-mass (Sigma(SFR)-Sigma(*)) relation gives important insights on how galaxies assemble at different spatial scales. Here, we present an analysis of the Sigma(SFR)-Sigma(*) of 40 local cluster galaxies undergoing ram-pressure stripping drawn from the GAs Stripping Phenomena in galaxies (GASP) sample. Considering their integrated properties, these galaxies show an SFR enhancement with respect to undisturbed galaxies of similar stellar mass; we now exploit spatially resolved data to investigate the origin and location of the excess. Even on similar to 1kpc scales, stripping galaxies present a systematic enhancement of Sigma(SFR) (similar to 0.35 dex at Sigma(*) = 10(8)M(circle dot) kpc(-2)) at any given Sigma(*) compared to their undisturbed counterparts. The excess is independent of the degree of stripping and of the amount of star formation in the tails, and it is visible at all galactocentric distances within the disks, suggesting that the star formation is most likely induced by compression waves from ram pressure. Such excess is larger for less massive galaxies and decreases with increasing mass. As stripping galaxies are characterized by ionized gas beyond the stellar disk, we also investigate the properties of 411 star-forming clumps found in the galaxy tails. At any given stellar mass density, these clumps are systematically forming stars at a higher rate than in the disk, but differences are reconciled when we just consider the mass formed in the last few 10(8) yr ago, suggesting that on these timescales, the local mode of star formation is similar in the tails and in the disks.
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