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Star Formation Rates in Cooling Flow Clusters: A UV Pilot Study with Archival XMM-Newton Optical Monitor Data (2005)
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BibTeX
@MISC{Hicks05starformation,
author = {A. K. Hicks and R. Mushotzky},
title = {Star Formation Rates in Cooling Flow Clusters: A UV Pilot Study with Archival XMM-Newton Optical Monitor Data},
year = {2005}
}
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Abstract
We have analyzed XMM-Newton Optical Monitor (OM) UV (180-400 nm) data for a sample of 33 galaxies. 30 are cluster member galaxies, and nine of these are central cluster galaxies (CCGs) in cooling flow clusters having mass deposition rates which span a range of 8 −525 M ⊙ yr −1. By comparing the ratio of UV to 2MASS J band fluxes, we find a significant UV excess in many, but not all, cooling flow CCGs, a finding consistent with the outcome of previous studies based on optical imaging data (McNamara & O’Connell 1989; Cardiel, Gorgas, & Aragon-Salamanca 1998; Crawford et al. 1999). This UV excess is a direct indication of the presence of young massive stars, and therefore recent star formation, in these galaxies. Using the Starburst99 spectral energy distribution (SED) model of continuous star formation over a 900 Myr period, we derive star formation rates of 0.2 −219 M ⊙ yr −1 for the cooling flow sample. For 2/3 of this sample it is possible to equate Chandra/XMM cooling flow mass deposition rates with UV inferred star formation rates, for a combination of starburst lifetime and IMF slope. This is a pilot study of the well populated XMM UV cluster archive and a more extensive follow up study is currently underway. Subject headings: cooling flows—galaxies:clusters:general—galaxies:elliptical and lenticular, cD—galaxies:stellar content—stars:formation—ultraviolet:stars
Keyphrases
star formation rate uv pilot study archival xmm-newton optical monitor data cooling flow cluster cooling flow sample 180-400 nm imf slope myr period xmm uv cluster archive central cluster galaxy band flux starburst lifetime mcnamara connell flow cluster pilot study subject heading significant uv excess flow ccgs direct indication uv excess stellar content star starburst99 spectral energy distribution recent star formation xmm-newton optical monitor continuous star formation general galaxy finding consistent chandra xmm previous study mass deposition rate flow mass deposition rate formation ultraviolet optical imaging data cluster member galaxy cd galaxy young massive star
