Nebular Emission in X-ray Selected Brightest Cluster Galaxies

Details Nebular Emission in X-ray Selected Brightest Cluster Galaxies Nebular Emission in X-ray Selected Brightest Cluster Galaxies

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20514708s&link_type=abstract

American Astronomical Society Meeting 205, #147.08; Bulletin of the American Astronomical Society, Vol. 36, p.1594

Astronomy and Astrophysics

Astronomy

Scientific paper

Optical spectra of brightest cluster galaxies selected from the 160 Square Degree ROSAT cluster survey (Vikhlinin et al. 1999) are used to measure the equivalent widths of [OII]λ3727 and Hα nebular emission lines. This line emission is used to trace warm ionized gas in the interstellar media of 77 brightest cluster galaxies. Their redshifts lie between z=0.066-0.7, while their X-ray luminosities range between LX =0.04-4.27×1044} erg s{-1 [0.5-2 keV]. We find no [OII]λ 3727 or Hα emission stronger than -15 Å, or -5 Å, respectively. A comparison between our sample and the frequency of brightest cluster galaxies with strong line emission from the Brightest Cluster Survey (Crawford et al. 1999) suggests that we could have detected nearly a dozen emission-line galaxies. We discuss several interpretations of this apparent dearth of emission line galaxies detected in our survey.

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