The thick disk in the galaxy NGC4244 from S4G imaging

Sébastien Comerón, Johan H. Knapen, Kartik Sheth, Michael W. Regan, Joannah L. Hinz, Armando Gil De Paz, Karín Menéndez-Delmestre, Juan Carlos Mũoz-Mateos, Mark Seibert, Taehyun Kim, E. Athanassoula, Albert Bosma, Ronald J. Buta, Bruce G. Elmegreen, Luis C. Ho, Benne W. Holwerda, Eija Laurikainen, Heikki Salo, Eva Schinnerer

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

If thick disks are ubiquitous and a natural product of disk galaxy formation and/or evolution processes, all undisturbed galaxies that have evolved during a significant fraction of a Hubble time should have a thick disk. The late-type spiral galaxy NGC4244 has been reported as the only nearby edge-on galaxy without a confirmed thick disk. Using data from the Spitzer Survey of Stellar Structure in Galaxies (S4G) we have identified signs of two disk components in this galaxy. The asymmetries between the light profiles on both sides of the mid-plane of NGC4244 can be explained by a combination of the galaxy not being perfectly edge-on and a certain degree of opacity of the thin disk. We argue that the subtlety of the thick disk is a consequence of either a limited secular evolution in NGC4244, a small fraction of stellar material in the fragments which built the galaxy, or a high amount of gaseous accretion after the formation of the galaxy.

Original languageEnglish (US)
Article number18
JournalAstrophysical Journal
Volume729
Issue number1
DOIs
StatePublished - Mar 1 2011

Keywords

  • galaxies: individual (NGC 4244)
  • galaxies: photometry
  • galaxies: spiral
  • galaxies: structure

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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