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FCC046 : a candidate gaseous polar ring dwarf elliptical galaxy in the Fornax cluster

Sven De Rijcke (UGent) , Pieter Buyle (UGent) and Mina Koleva (UGent)
Author
Organization
Abstract
FCC046 is a Fornax Cluster dwarf elliptical galaxy. Optical observations have shown that this galaxy, besides an old and metal-poor stellar population, also contains a very young centrally concentrated population and is actively forming stars, albeit at a very low level. Here, we report on 21 cm observations of FCC046 with the Australia Telescope Compact Array which we conducted in the course of a small survey of Fornax Cluster early-type dwarf galaxies. We have discovered a similar to 10(7) M-circle dot H I cloud surrounding FCC046. We show that the presence of this significant gas reservoir offers a concise explanation for this galaxy's optical morphological and kinematical properties. Surprisingly, the Hi gas, as evidenced by its morphology and its rotational motion around the galaxy's optical major axis, is kinematically decoupled from the galaxy's stellar body. This is the first time such a ring of gaseous material in minor-axis rotation is discovered around a dwarf galaxy.
Keywords
galaxies: dwarf, galaxies: evolution, galaxies: stellar content, STAR-FORMATION, INTERSTELLAR-MEDIUM, RAM PRESSURE, EVOLUTION, SIMULATIONS, EMISSION, GAS, galaxies: clusters: individual (Fornax Cluster)

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Citation

Please use this url to cite or link to this publication:

Chicago
De Rijcke, Sven, Pieter Buyle, and Mina Koleva. 2013. “FCC046 : a Candidate Gaseous Polar Ring Dwarf Elliptical Galaxy in the Fornax Cluster.” Astrophysical Journal Letters 770 (2).
APA
De Rijcke, S., Buyle, P., & Koleva, M. (2013). FCC046 : a candidate gaseous polar ring dwarf elliptical galaxy in the Fornax cluster. ASTROPHYSICAL JOURNAL LETTERS, 770(2).
Vancouver
1.
De Rijcke S, Buyle P, Koleva M. FCC046 : a candidate gaseous polar ring dwarf elliptical galaxy in the Fornax cluster. ASTROPHYSICAL JOURNAL LETTERS. 2013;770(2).
MLA
De Rijcke, Sven, Pieter Buyle, and Mina Koleva. “FCC046 : a Candidate Gaseous Polar Ring Dwarf Elliptical Galaxy in the Fornax Cluster.” ASTROPHYSICAL JOURNAL LETTERS 770.2 (2013): n. pag. Print.
@article{4130742,
  abstract     = {FCC046 is a Fornax Cluster dwarf elliptical galaxy. Optical observations have shown that this galaxy, besides an old and metal-poor stellar population, also contains a very young centrally concentrated population and is actively forming stars, albeit at a very low level. Here, we report on 21 cm observations of FCC046 with the Australia Telescope Compact Array which we conducted in the course of a small survey of Fornax Cluster early-type dwarf galaxies. We have discovered a similar to 10(7) M-circle dot H I cloud surrounding FCC046. We show that the presence of this significant gas reservoir offers a concise explanation for this galaxy's optical morphological and kinematical properties. Surprisingly, the Hi gas, as evidenced by its morphology and its rotational motion around the galaxy's optical major axis, is kinematically decoupled from the galaxy's stellar body. This is the first time such a ring of gaseous material in minor-axis rotation is discovered around a dwarf galaxy.},
  articleno    = {L26},
  author       = {De Rijcke, Sven and Buyle, Pieter and Koleva, Mina},
  issn         = {2041-8205},
  journal      = {ASTROPHYSICAL JOURNAL LETTERS},
  keywords     = {galaxies: dwarf,galaxies: evolution,galaxies: stellar content,STAR-FORMATION,INTERSTELLAR-MEDIUM,RAM PRESSURE,EVOLUTION,SIMULATIONS,EMISSION,GAS,galaxies: clusters: individual (Fornax Cluster)},
  language     = {eng},
  number       = {2},
  pages        = {5},
  title        = {FCC046 : a candidate gaseous polar ring dwarf elliptical galaxy in the Fornax cluster},
  url          = {http://dx.doi.org/10.1088/2041-8205/770/2/L26},
  volume       = {770},
  year         = {2013},
}

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