Mathematics – Logic
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3475p&link_type=abstract
Spitzer Proposal ID #3475
Mathematics
Logic
Scientific paper
We propose deep MIPS raster maps of extended fields centered on 11 gas-rich dwarf galaxies in the Virgo Cluster. The MIPS maps will elucidate the nature of the very cold dust outside the optical extent of these galaxies, as discovered by us with ISOPHOT. The 11 targets were selected either because they exhibit 170 micron emission from cold dust extending beyond the optical body of the galaxies (by factors of up to more than 3.5), and/or because they have extremely high 170/100 flux density ratios. The superior sensitivity and improved angular resolution of MIPS will allow us to obtain the first 2D maps of the extended 160 micron cold dust emission with detailed morphological information. The same large fields will also be mapped at 70 micron to obtain a spatial template of the cirrus emission which is the dominant source of confusion at 160 micron. The resulting deep MIPS maps at 160 micron will constitute a unique probe for distinguishing between the different scenarios for the wider existence, origin and heating mechanisms of the extended cold dust. We propose to exploit the excellent sensitivity of MIPS at 24 and 70 micron to measure the expected warm dust emission from the HII regions within these galaxies. This will probe the link - if any - between the dust powered within the optical disk and dust external to this disk. Comparison with CO, submm and optical broad/narrow band maps (all data already obtained and reduced by us) of the optical body of the dwarfs will be used to completely characterize the dust and gas content as well as the star formation properties and stellar mass of the central galaxy. Our observations will throw light on the relation of the dwarf galaxies to their ambient medium. They will also be important in a cosmological context, since gas-rich dwarf galaxies may prevail at the earliest epochs, making a higher contribution to the total FIR output of the early Universe than previously expected. The total AOR time for the proposed MIPS observations is 11.4 h.
Gil de Paz Armando
Madore Barry F.
Popescu Cristina
Tuffs Richard. J.
Voelk Heinrich J.
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