Journal article
SDSS-IV MaNGA: The Radial Profile of Enhanced Star Formation in Close Galaxy Pairs
The Astrophysical journal, Vol.909(2), p.120
03/01/2021
DOI: 10.3847/1538-4357/abe2a5
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 similar to 0.3 dex and that there is a weak sSFR suppression in the outskirts of the galaxies of similar to 0.1 dex. 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.
Details
- Title: Subtitle
- SDSS-IV MaNGA: The Radial Profile of Enhanced Star Formation in Close Galaxy Pairs
- Creators
- Joshua L. Steffen - University of IowaHai Fu - University of IowaJ. M. Comerford - University of Colorado BoulderY. Sophia Dai - National Astronomical ObservatoriesShuai Feng - Hebei Normal UniversityArran C. Gross - University of IowaRui Xue - University of Iowa
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.909(2), p.120
- Publisher
- IOP Publishing Ltd
- DOI
- 10.3847/1538-4357/abe2a5
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Number of pages
- 13
- Grant note
- University of Notre Dame New York University Universidad Nacional Autonoma de Mexico University of Utah Lawrence Berkeley National Laboratory; United States Department of Energy (DOE) HarvardSmithsonian Center for Astrophysics; Smithsonian Institution; Harvard-Smithsonian Center for Astrophysics Ohio State University Vanderbilt University Center for High-Performance Computing at the University of Utah Max-Planck-Institut fur Astronomie (MPIA Heidelberg) Carnegie Institution for Science National Astronomical Observatories of China Chilean Participation Group U.S. Department of Energy Office of Science; United States Department of Energy (DOE) Alfred P. Sloan Foundation Carnegie Mellon University Max-Planck-Institut fur Astrophysik (MPA Garching) United Kingdom Participation Group University of Washington Instituto de Astrofisica de Canarias University of Wisconsin Observatorio Nacional/MCTI University of Arizona Yale University New Mexico State University Pennsylvania State University University of Oxford University of Portsmouth Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo Brazilian Participation Group French Participation Group MaxPlanck-Institut fur Extraterrestrische Physik (MPE) University of Colorado Boulder 10878003 / NSFC; National Natural Science Foundation of China (NSFC) University of Virginia Leibniz Institut fur Astrophysik Potsdam (AIP) Shanghai Astronomical Observatory AST-1614326 / National Science Foundation (NSF); National Research Foundation of Korea Korean Participation Group Johns Hopkins University
- Language
- English
- Date published
- 03/01/2021
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984429027102771
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