Do stars ionise the filaments in NGC 1275 ?

Details Do stars ionise the filaments in NGC 1275 ? Do stars ionise the filaments in NGC 1275 ?

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12189j&link_type=abstract

HST Proposal ID #12189. Cycle 18

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Scientific paper

Brightest Cluster Galaxies {BCGs} in cool core clusters show filaments of line emitting gas whose ionization physics has been much studied but little understood. Some filaments show blue knots suggesting young star clusters; others do not. We request deep COS G140L FUV spectra of five regions in the filaments surrounding the BCG NGC 1275 in the nearby Perseus cluster. Analysis of the spectra, and particularly the [CIV] feature will clarify whether the filaments are ionized by normal stars, ultrahot stars, or a nonthermal source weak in FUV photons. The possible role of the active nucleus will be investigated by selecting regions located at various distances from the nucleus. Understanding the ionization and heating of these filaments, and why some filaments form stars, whilst others are prevented from collapsing, is important not only to the understanding of cool core clusters, but also to the wider issue of galaxy formation.;

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