The empty ring galaxy ESO 474-G040 | Zendy

N. Brosch | Zendy; P. Väisänen | Zendy; A. Y. Kniazev | Zendy; А. В. Моисеев | Zendy

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The empty ring galaxy ESO 474-G040

Author(s) -

N. Brosch,

P. Väisänen,

A. Y. Kniazev,

А. В. Моисеев

Publication year - 2015

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/stv1245

Subject(s) - physics , galaxy , ring (chemistry) , astrophysics , metallicity , stellar population , telescope , stars , astronomy , spectroscopy , very large telescope , population , line (geometry) , kinematics , star formation , geometry , classical mechanics , chemistry , demography , organic chemistry , mathematics , sociology

We describe observations of the apparently empty ring galaxy ESO 474-G040 obtained with the Southern African Large Telescope (SALT). The observations, consisting of imaging, long-slit spectroscopy and Fabry-Perot mapping of the H-alpha line, allow determining the ring kinematics as well as estimating the metallicity of the ring and the stellar population composition in its various parts. We propose that the object could best be understood as being the result of a past merger of disk galaxies, which formed a gas ring that subsequently disrupted via the bead instability and is presently forming stars.

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