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Vertical distribution of stars and flaring in the Milky Way

Published online by Cambridge University Press:  14 May 2020

Suchira Sarkar Open the ORCID record for Suchira Sarkar [Opens in a new window]  and
Chanda J. Jog
Suchira Sarkar
Affiliation:
Department of Physics, Indian Institute of Science, Bangalore, India emails: suchira@iisc.ac.in, cjjog@iisc.ac.in
Chanda J. Jog
Affiliation:
Department of Physics, Indian Institute of Science, Bangalore, India emails: suchira@iisc.ac.in, cjjog@iisc.ac.in
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Abstract

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We study the vertical stellar distribution of the Milky Way thin disk treated as a gravitationally coupled system of stars, HI and H2 gas in the field of dark matter halo, from R = 4 to 22 kpc. We show that the gas and halo gravity mainly constrain this vertical distribution toward the mid-plane in the inner and the outer Galaxy, respectively. The halo gravity reduces the disk thickness by a factor of 3-4 in the outer Galaxy. Despite this constraining effect the disk thickness increases steadily with radius, flaring steeply beyond 17 kpc, making a flaring disk a generic result.

Keywords

Galaxy: diskGalaxy: halogalaxies: kinematics & dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S353: Galactic Dynamics in the Era of Large Surveys , June 2019 , pp. 13 - 15
Copyright
© International Astronomical Union 2020

References

Narayan, C. A. & Jog, C. J. 2002, A&A, 394, 89Google Scholar
Sarkar, S. & Jog, C. J. 2018, A&A, 617, A142Google Scholar
Sarkar, S. & Jog, C. J. 2019, A&A, 628, A58Google Scholar