Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 516, Issue 1, Pages 656-667Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac2165
Keywords
galaxies: evolution; galaxies: kinematics and dynamics; galaxies: abundances; galaxies: interactions; galaxies: spiral; galaxies: star formation
Categories
Funding
- Russian Science Foundation (RSCF) [19-72-20089, 19-12-00281]
- Ministry of Science and Higher Education of the Russian Federation [075-15-2022-262 (13.MNPMU.21.0003)]
- German Research Foundation (DFG) [KR4598/2-1]
- Alfred P. Sloan Foundation
- U.S. Department of Energy Office of Science
- Center for HighPerformance Computing at the University of Utah
- Brazilian Participation Group
- Carnegie Institution for Science
- Carnegie Mellon University
- Chilean Participation Group
- French Participation Group
- Harvard-Smithsonian Center for Astrophysics
- Instituto de Astrof'isica de Canarias
- Johns Hopkins University
- Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo
- Lawrence Berkeley National Laboratory
- Leibniz Institut fur Astrophysik Potsdam (AIP)
- Max-Planck-Institut fur Astronomie (MPIA Heidelberg)
- Max-Planck-Institut fur Astrophysik (MPA Garching)
- Max-PlanckInstitut fur Extraterrestrische Physik (MPE)
- National Astronomical Observatories of China
- New Mexico State University
- New York University
- University of Notre Dame
- Observatario Nacional/MCTI
- Ohio State University
- Pennsylvania State University
- Shanghai Astronomical Observatory
- United Kingdom Participation Group
- Universidad Nacional Autonoma de Mexico
- University of Arizona
- University of Colorado Boulder
- University of Oxford
- University of Portsmouth
- University of Utah
- University of Virginia
- University of Washington
- University of Wisconsin
- Vanderbilt University
- Yale University
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This study compares two M 51-type systems, Arp 68 and Arp 58, and finds significant differences in their stellar masses, gas content, and environment. The study reveals large-scale non-circular gas motion in both systems and saw-edged velocity profiles along the tidal spiral arm of Arp 68. The main galaxy in the Arp 68 system is experiencing a burst of star formation, while Arp 58 has a higher metal abundance and a shallow negative radial gradient of the gas-phase oxygen abundance.
We study two M 51-type systems Arp 68 and Arp 58, which strongly differ by their stellar masses, gas content, and environment. Long-slit spectral observations obtained at the Russian 6-m telescope were used to trace the distributions of a line-of-sight (LOS) velocity and a gas-phase oxygen abundance along the spectral cuts. Two systems are compared by their observed properties. We found a very strong large-scale non-circular motion of gas in both systems and a kpc-size saw-edged velocity profile along the tidal spiral arm of Arp 68, probably caused by the gas outflow due to the stellar feedback. A deep decrease of LOS velocity is also found in the 'hinge' region in Arp 58, where the inner spiral arm transforms into the tidal spiral arm, which was predicted earlier for M 51-type galaxies. Local sites of star formation and the satellites are compared with the evolutionary models at the colour-colour diagrams. Unlike the spiral galaxy Arp 58, the main galaxy in Arp 68 system is experiencing an ongoing burst of star formation. Gas-phase metallicity estimates show that Arp 58 has a higher metal abundance and reveals a shallow negative radial gradient of the gas-phase oxygen abundance. The emission gas in Arp 68 has noticeably lower metallicity than it is expected for a given luminosity of this galaxy, which may be connected with its space position in the local void.
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