Star formation rates and chemical abundances of emission-line galaxies in intermediate-redshift clusters

M. Mouhcine, S. P. Bamford, A. Aragón-Salamanca, Osamu Nakamura, B. Milvang-Jensen

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We examine the evolutionary status of luminous, star-forming galaxies in intermediate-redshift clusters by considering their star formation rates (SFRs) and the chemical and ionization properties of their interstellar emitting gas. Our sample consists of 17 massive, star-forming, mostly disc galaxies with , in clusters with redshifts in the range , with a median of . We compare these galaxies with the identically selected and analysed intermediate-redshift field sample of Mouhcine et al., and with local galaxies from the Nearby Field Galaxy Survey of Jansen et al. From our optical spectra, we measure the equivalent widths of and [O iii]λ5007 emission lines to determine diagnostic line ratios, oxygen abundances and extinction-corrected SFRs. The star-forming galaxies in intermediate-redshift clusters display emission-line equivalent widths which are, on average, significantly smaller than measured for field galaxies at comparable redshifts. However, a contrasting fraction of our cluster galaxies have equivalent widths similar to the highest observed in the field. This tentatively suggests a bimodality in the SFRs per unit luminosity for galaxies in distant clusters. We find no evidence for further bimodalities, or differences between our cluster and field samples, when examining additional diagnostics and the oxygen abundances of our galaxies. This maybe because no such differences exist, perhaps because the cluster galaxies which still display signs of star formation have recently arrived from the field. In order to examine this topic with more certainty, and to further investigate the way in which any disparity varies as a function of cluster properties, larger spectroscopic samples are needed.

Original languageEnglish
Pages (from-to)1871-1879
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume368
Issue number4
DOIs
Publication statusPublished - 2006 Jun
Externally publishedYes

Fingerprint

star formation rate
galaxies
oxygen
field survey
ionization
extinction
gas
rate
chemical
stars
disk galaxies
massive stars
chemical properties
optical spectrum
star formation
luminosity

Keywords

  • Galaxies: abundances
  • Galaxies: clusters: general
  • Galaxies: evolution
  • Galaxies: fundamental parameters

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Star formation rates and chemical abundances of emission-line galaxies in intermediate-redshift clusters. / Mouhcine, M.; Bamford, S. P.; Aragón-Salamanca, A.; Nakamura, Osamu; Milvang-Jensen, B.

In: Monthly Notices of the Royal Astronomical Society, Vol. 368, No. 4, 06.2006, p. 1871-1879.

Research output: Contribution to journalArticle

Mouhcine, M. ; Bamford, S. P. ; Aragón-Salamanca, A. ; Nakamura, Osamu ; Milvang-Jensen, B. / Star formation rates and chemical abundances of emission-line galaxies in intermediate-redshift clusters. In: Monthly Notices of the Royal Astronomical Society. 2006 ; Vol. 368, No. 4. pp. 1871-1879.
@article{564f6cb55b284108ac1e410d91f7fa39,
title = "Star formation rates and chemical abundances of emission-line galaxies in intermediate-redshift clusters",
abstract = "We examine the evolutionary status of luminous, star-forming galaxies in intermediate-redshift clusters by considering their star formation rates (SFRs) and the chemical and ionization properties of their interstellar emitting gas. Our sample consists of 17 massive, star-forming, mostly disc galaxies with , in clusters with redshifts in the range , with a median of . We compare these galaxies with the identically selected and analysed intermediate-redshift field sample of Mouhcine et al., and with local galaxies from the Nearby Field Galaxy Survey of Jansen et al. From our optical spectra, we measure the equivalent widths of and [O iii]λ5007 emission lines to determine diagnostic line ratios, oxygen abundances and extinction-corrected SFRs. The star-forming galaxies in intermediate-redshift clusters display emission-line equivalent widths which are, on average, significantly smaller than measured for field galaxies at comparable redshifts. However, a contrasting fraction of our cluster galaxies have equivalent widths similar to the highest observed in the field. This tentatively suggests a bimodality in the SFRs per unit luminosity for galaxies in distant clusters. We find no evidence for further bimodalities, or differences between our cluster and field samples, when examining additional diagnostics and the oxygen abundances of our galaxies. This maybe because no such differences exist, perhaps because the cluster galaxies which still display signs of star formation have recently arrived from the field. In order to examine this topic with more certainty, and to further investigate the way in which any disparity varies as a function of cluster properties, larger spectroscopic samples are needed.",
keywords = "Galaxies: abundances, Galaxies: clusters: general, Galaxies: evolution, Galaxies: fundamental parameters",
author = "M. Mouhcine and Bamford, {S. P.} and A. Arag{\'o}n-Salamanca and Osamu Nakamura and B. Milvang-Jensen",
year = "2006",
month = "6",
doi = "10.1111/j.1365-2966.2006.10264.x",
language = "English",
volume = "368",
pages = "1871--1879",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "4",

}

TY - JOUR

T1 - Star formation rates and chemical abundances of emission-line galaxies in intermediate-redshift clusters

AU - Mouhcine, M.

AU - Bamford, S. P.

AU - Aragón-Salamanca, A.

AU - Nakamura, Osamu

AU - Milvang-Jensen, B.

PY - 2006/6

Y1 - 2006/6

N2 - We examine the evolutionary status of luminous, star-forming galaxies in intermediate-redshift clusters by considering their star formation rates (SFRs) and the chemical and ionization properties of their interstellar emitting gas. Our sample consists of 17 massive, star-forming, mostly disc galaxies with , in clusters with redshifts in the range , with a median of . We compare these galaxies with the identically selected and analysed intermediate-redshift field sample of Mouhcine et al., and with local galaxies from the Nearby Field Galaxy Survey of Jansen et al. From our optical spectra, we measure the equivalent widths of and [O iii]λ5007 emission lines to determine diagnostic line ratios, oxygen abundances and extinction-corrected SFRs. The star-forming galaxies in intermediate-redshift clusters display emission-line equivalent widths which are, on average, significantly smaller than measured for field galaxies at comparable redshifts. However, a contrasting fraction of our cluster galaxies have equivalent widths similar to the highest observed in the field. This tentatively suggests a bimodality in the SFRs per unit luminosity for galaxies in distant clusters. We find no evidence for further bimodalities, or differences between our cluster and field samples, when examining additional diagnostics and the oxygen abundances of our galaxies. This maybe because no such differences exist, perhaps because the cluster galaxies which still display signs of star formation have recently arrived from the field. In order to examine this topic with more certainty, and to further investigate the way in which any disparity varies as a function of cluster properties, larger spectroscopic samples are needed.

AB - We examine the evolutionary status of luminous, star-forming galaxies in intermediate-redshift clusters by considering their star formation rates (SFRs) and the chemical and ionization properties of their interstellar emitting gas. Our sample consists of 17 massive, star-forming, mostly disc galaxies with , in clusters with redshifts in the range , with a median of . We compare these galaxies with the identically selected and analysed intermediate-redshift field sample of Mouhcine et al., and with local galaxies from the Nearby Field Galaxy Survey of Jansen et al. From our optical spectra, we measure the equivalent widths of and [O iii]λ5007 emission lines to determine diagnostic line ratios, oxygen abundances and extinction-corrected SFRs. The star-forming galaxies in intermediate-redshift clusters display emission-line equivalent widths which are, on average, significantly smaller than measured for field galaxies at comparable redshifts. However, a contrasting fraction of our cluster galaxies have equivalent widths similar to the highest observed in the field. This tentatively suggests a bimodality in the SFRs per unit luminosity for galaxies in distant clusters. We find no evidence for further bimodalities, or differences between our cluster and field samples, when examining additional diagnostics and the oxygen abundances of our galaxies. This maybe because no such differences exist, perhaps because the cluster galaxies which still display signs of star formation have recently arrived from the field. In order to examine this topic with more certainty, and to further investigate the way in which any disparity varies as a function of cluster properties, larger spectroscopic samples are needed.

KW - Galaxies: abundances

KW - Galaxies: clusters: general

KW - Galaxies: evolution

KW - Galaxies: fundamental parameters

UR - http://www.scopus.com/inward/record.url?scp=33744505917&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33744505917&partnerID=8YFLogxK

U2 - 10.1111/j.1365-2966.2006.10264.x

DO - 10.1111/j.1365-2966.2006.10264.x

M3 - Article

VL - 368

SP - 1871

EP - 1879

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -