Tidally Compressed Gas in Centers of Early‐Type and Ultraluminous Galaxies | Zendy

Mousumi Das | Zendy; Chanda J. Jog | Zendy

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Tidally Compressed Gas in Centers of Early‐Type and Ultraluminous Galaxies

Author(s) -

Mousumi Das,

Chanda J. Jog

Publication year - 1999

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/308121

Subject(s) - physics , astrophysics , galaxy , virial theorem , galaxy rotation curve , radius , molecular cloud , astronomy , galaxy formation and evolution , stars , computer science , computer security

In this paper we propose that the compressive tidal field in the centers offlat-core early type galaxies and ultraluminous galaxies compresses molecularclouds producing dense gas obseved in the centers of these galaxies. The effectof galactic tidal fields is usually considered disruptive in the literature.However, for some galaxies, the mass profile flattens towards the center andthe resulting galactic tidal field is not disruptive but instead it iscompressive within the flat-core region. We have used the virial theorem todetermine the minimum density of a molecular cloud to be stable andgravitationally bound within the tidally compressive region of a galaxy. Wehave applied the mechanism to determine the mean molecular cloud densities inthe centers of a sample of flat-core, early-type galaxies and ultraluminousgalaxies.Comment: 18 latex pages and uses aaspp4.sty, accepted for publication in Astrophysical Journa

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