IRS Spectroscopy of Cluster Core Filaments

Details IRS Spectroscopy of Cluster Core Filaments IRS Spectroscopy of Cluster Core Filaments

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20343f&link_type=abstract

Spitzer Proposal ID #20343

Physics

Scientific paper

We propose to make IRS observations, using the high-resolution spectrographs, of optical emission line filaments in regions ~20 kpc (~1 arcmin) from the nucleus of NGC 1275, the central galaxy in the Perseus Cluster. These observations will help us to diagnose the heating mechanism of these filaments, which has been a long-standing problem, and understand the relation of this gas to the X-ray emitting intracluster medium. We have detected 2-micron ro-vibrational molecular hydrodgen lines from these regions with UKIRT. We expect to detect low excitation members of the H2 0-0 pure rotational line series and will also cover fine structure lines due to NeII, SI, SIII and Si II. These lines will be diagnostic of the presence of warm gas (few hundred degrees excitation temperature) intermediate between the cold CO emitting phase and the much hotter near infra-red and optically emitting phase. We also propose to cover the extended emission-line filament to the south of Abell 1795 which shows detailed correspondence with X-ray emission, and the peculiar dusty H-alpha nebula at the core of the Centaurus cluster.

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