Infrared luminosity function of the Coma Cluster

Lei Bai, George H. Rieke, Marcia J Rieke, Joannah L. Hinz, Douglas M. Kelly, Myra Blaylock

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Using mid-IR and optical data, we deduce the total infrared (IR) luminosities of galaxies in the Coma Cluster and present their IR luminosity function (LF). The shape of the overall Coma IR LF does not show significant differences from the IR LFs of the general field, which indicates the general independence of global galaxy star formation from environment up to densities ∼40 times greater than in the field (we cannot test such independence above LIR ≈1044 ergs s-1). However, a shallower faint-end slope and a smaller LIR* are found in the core region (where the densities are still higher) compared to the outskirt region of the cluster, and most of the brightest IR galaxies are found outside the core region. The IR LF in the NGC 4839 group region does not show any unique characteristics. By integrating the IR LF, we find a total star formation rate in the cluster of about 97.0 M⊙ yr-1. We also studied the contributions of early- and late-type galaxies to the IR LF. The late-type galaxies dominate the bright end of the LF, and the early-type galaxies, although only making up a small portion (≈15%) of the total IR emission of the cluster, contribute greatly to the number counts of the LF at LIR < 1043 ergs s -1.

Original languageEnglish (US)
Pages (from-to)827-837
Number of pages11
JournalAstrophysical Journal
Volume639
Issue number2 I
DOIs
StatePublished - Mar 10 2006

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coma
luminosity
galaxies
erg
star formation rate
star formation
slopes

Keywords

  • Galaxies: clusters: individual (Coma)
  • Galaxies: luminosity function, mass function
  • Infrared: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Infrared luminosity function of the Coma Cluster. / Bai, Lei; Rieke, George H.; Rieke, Marcia J; Hinz, Joannah L.; Kelly, Douglas M.; Blaylock, Myra.

In: Astrophysical Journal, Vol. 639, No. 2 I, 10.03.2006, p. 827-837.

Research output: Contribution to journalArticle

Bai, L, Rieke, GH, Rieke, MJ, Hinz, JL, Kelly, DM & Blaylock, M 2006, 'Infrared luminosity function of the Coma Cluster', Astrophysical Journal, vol. 639, no. 2 I, pp. 827-837. https://doi.org/10.1086/499620
Bai, Lei ; Rieke, George H. ; Rieke, Marcia J ; Hinz, Joannah L. ; Kelly, Douglas M. ; Blaylock, Myra. / Infrared luminosity function of the Coma Cluster. In: Astrophysical Journal. 2006 ; Vol. 639, No. 2 I. pp. 827-837.
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