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Bar-driven Shock Features in M31

Published online by Cambridge University Press:  30 October 2025

Zi-Xuan Feng Open the ORCID record for Zi-Xuan Feng [Opens in a new window] ,
Zhi Li ,
Juntai Shen ,
Ortwin Gerhard Open the ORCID record for Ortwin Gerhard [Opens in a new window] ,
R. P. Saglia  and
Matias Blaña
Zi-Xuan Feng
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, P.R. China School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, P. R. China
Zhi Li
Affiliation:
Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China;
Juntai Shen*
Affiliation:
Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China; Key Laboratory for Particle Astrophysics and Cosmology (MOE) / Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai 200240, P. R. China
Ortwin Gerhard
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching, Germany
R. P. Saglia
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching, Germany Universitäts-Sternwarte München, Scheinerstr. 1, 81679 Munich, Germany
Matias Blaña
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching, Germany Institute of Astrophysics, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile
*
email: jtshen@sjtu.edu.cn
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Abstract

We have identified the velocity jump (shock) features in the inner 20′ × 10′ region of M31 using the data of [O III] and H I. The identified shock features are found primarily on the leading side of the potential bar, displaying a typical pattern of bar-driven gas inflow. The shock features provide independent evidence for M31 being a barred galaxy. Our preliminary gas simulations with a barred potential of M31 can reproduce these shock features.

Keywords

interstellar mediumhydrodynamical simulationbarred galaxyAndromeda galaxy

Information

Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S379: Dynamical Masses of Local Group Galaxies , December 2023 , pp. 120 - 122
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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of International Astronomical Union

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