Ram pressure stripping and ISM disc truncation: prediction versus observation

Author:

Lee Seona1,Sheen Yun-Kyeong2,Yoon Hyein134,Jaffé Yara5ORCID,Chung Aeree1ORCID

Affiliation:

1. Department of Astronomy, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea

2. Korea Astronomy and Space Science Institute , 776 Daedeok-daero, Yuseong-gu, Daejeon 34055, Republic of Korea

3. Sydney Institute for Astronomy, School of Physics , A28, The University of Sydney, Sydney, NSW 2006, Australia

4. ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Australia

5. Instituto de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso , Avda. Gran Bretana 1111 Valparaíso, Chile

Abstract

ABSTRACT Ram pressure stripping (RPS) is known to be a key environmental effect that can remove interstellar gas from galaxies in a cluster. The RPS process is commonly described as a competition between the ram pressure by the intracluster medium and the anchoring pressure on the interstellar medium by the gravitational potential of a galaxy. However, the actual gas stripping process can be more complicated due to the complexity of gas physics such as compression and geometrical self-shielding as well as cooling and heating. In order to verify how well the observed signatures of the RPS process can be understood as simple momentum transfer, we compare the stripping radii of Virgo cluster galaxies in different stages of RPS measured from the H i observation with the predicted gas truncation radii for the given conditions. For the sample undergoing active RPS, we generally find good agreements between predictions and observations within a measurement uncertainty. On the other hand, galaxies likely in the early or later RPS stage and/or the ones with signs of environmental impacts other than RPS such as tidal interaction or starvation show some discrepancies. Our results imply that the conventional RPS relation works reasonably well in a broad sense when RPS is the most dominant process and the galaxy is located where the surrounding environment can be well defined. Otherwise, more careful inspections on the second mechanism and local environment are required to assess the impact of RPS on the target.

Funder

National Research Foundation of Korea

Ministry of Science and ICT, South Korea

Australian Research Council

ANID

FONDECYT

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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