Revealing the Nature of one of the most H2-bright ULIRGs

Details Revealing the Nature of one of the most H2-bright ULIRGs Revealing the Nature of one of the most H2-bright ULIRGs

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30202d&link_type=abstract

Spitzer Proposal ID #30202

Physics

Scientific paper

We propose observations with all three instruments on-board Spitzer of one of the most H2-bright galaxies known so far, the local ULIRG IRASF23578-5307 at z~0.125. The H2-brightness of this ULIRG, relative to bright lines tracing HII-regions, was discovered through near-infrared follow-up spectroscopic observations of a sample of ULIRGs previously observed by ISO. We note that the NIR H2-emission in IRASF23578-5307 is even stronger than in the well known H2-bright object NGC 6240 which was observed by Spitzer (Armus et al. 2005). Due to the wealth of diagnostic tools in the mid-infrared, the proposed IRS spectroscopic observations both in low and high resolution mode will give us deep insight into the nature of the strong NIR H2-emission lines seen. We aim at observing atomic fine structure lines, H2 molecular lines, PAHs and possible silicate absorption features. And thus we will apply standard MIR-diagnostic tools in order to reveal the nature of the unusual strong H2 emission detected in this ULIRG and determine if starburst or AGN activity is the dominant energy source. We will test the relevance of possible excitation mechanisms of H2 (fluorescence, PDR, shocks, Xray-heating). In addition, the IRAC 4-band and the MIPS 24 micron observations will provide us a solid calibration of the IRS-spectroscopy. MIPS observations at 70 and 160 micron will allow us to set constraints on the dust temperatures, the geometry and the dust mass. The extraordinary properties in the NIR and the tantalizing ISOPHOT-S spectrum, make it indispensable to obtain Spitzer observations of this peculiar object.

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