Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543218l&link_type=abstract
American Astronomical Society, AAS Meeting #215, #432.18; Bulletin of the American Astronomical Society, Vol. 42, p.369
Other
Scientific paper
We combine new ASTE/AzTEC 1.1 mm maps of the galaxy pair NGC1512/1510 with archival Spitzer IRAC and MIPS images covering the wavelength range 3.6-160 µm from the SINGS project. The two galaxies form a high-metallicity, large spiral (NGC1512)/low-metallicity compact dwarf (NGC1510) pair. Using the models of Draine & Li (2007), the derived total dust masses are (2.4±0.6)×107 and (1.7±3.6)×105 Msun for NGC1512 and NGC1510, respectively. The derived dust/H I ratio is within expectations of low-metallicity galaxies for NGC1510, but it is much lower, by at least a factor of 3, than expected for NGC1512, as previously found by Draine et al. (2007). In contrast, regions within NGC1512, specifically the central region and the arms, do not show such unusually low dust/H I values, suggesting the possibility that some of the H I included in the determination of the dust/H I ratio of NGC1512 is not associated with the star forming disk. Simple two-temperature modified-blackbody fits to the far-infrared/mm data of the two galaxies and the sub-regions of NGC1512 are also performed to derive the dust masses associated with warm and cool dust components. As generally expected, the warm dust temperature of the low-metallicity, low-mass NGC1510 (˜36 K) is substantially higher than the corresponding warm temperature of the high-metallicity spiral NGC1512 (˜24 K). In both galaxies, our fits indicate that a substantial fraction (>93%) of the total dust mass is in a cool dust component (˜14-16 K for NGC1512 and ˜15-24 K for NGC1510). This result is similar to what is determined for a few other nearby galaxies. The warm dust component in the sub-galactic regions of NGC1512 represents a much larger fraction of the total dust content (17-40%), in agreement with the fact that all three regions have higher specific star formation rates than the average in the galaxy.
Aretxaga Itziar
Austermann Jacqueline
Calzetti Daniela
Draine Bruce T.
Ezawa Hajime
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