The empty ring galaxy ESO 474-G040

Noah Brosch; Petri Väisänen; Alexei Y. Kniazev; Alexei Moiseev

doi:10.1093/mnras/stv1245

The empty ring galaxy ESO 474-G040

Noah Brosch^*, Petri Väisänen, Alexei Y. Kniazev, Alexei Moiseev

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

We describe observations of the apparently empty ring galaxy ESO 474-G040 obtained with the Southern African Large Telescope. The observations, consisting of imaging, long-slit spectroscopy and Fabry-Pérot mapping of the H α 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 disc galaxies, which formed a gas ring that subsequently disrupted via the bead instability and is presently forming stars.

Original language	English
Pages (from-to)	4114-4125
Number of pages	12
Journal	Monthly Notices of the Royal Astronomical Society
Volume	451
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stv1245
State	Published - 24 Apr 2015

Keywords

Galaxies: individual: ESO 474-G040
Galaxies: peculiar

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10.1093/mnras/stv1245

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title = "The empty ring galaxy ESO 474-G040",

abstract = "We describe observations of the apparently empty ring galaxy ESO 474-G040 obtained with the Southern African Large Telescope. The observations, consisting of imaging, long-slit spectroscopy and Fabry-P{\'e}rot mapping of the H α 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 disc galaxies, which formed a gas ring that subsequently disrupted via the bead instability and is presently forming stars.",

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AU - Brosch, Noah

AU - Väisänen, Petri

AU - Kniazev, Alexei Y.

AU - Moiseev, Alexei

PY - 2015/4/24

Y1 - 2015/4/24

N2 - We describe observations of the apparently empty ring galaxy ESO 474-G040 obtained with the Southern African Large Telescope. The observations, consisting of imaging, long-slit spectroscopy and Fabry-Pérot mapping of the H α 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 disc galaxies, which formed a gas ring that subsequently disrupted via the bead instability and is presently forming stars.

AB - We describe observations of the apparently empty ring galaxy ESO 474-G040 obtained with the Southern African Large Telescope. The observations, consisting of imaging, long-slit spectroscopy and Fabry-Pérot mapping of the H α 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 disc galaxies, which formed a gas ring that subsequently disrupted via the bead instability and is presently forming stars.

KW - Galaxies: individual: ESO 474-G040

KW - Galaxies: peculiar

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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The empty ring galaxy ESO 474-G040

Abstract

Keywords

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