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: http://www.stsci.edu/~kgordon/papers/2012ApJ...761...42S.html
Дата изменения: Thu Jan 21 19:39:49 2016 Дата индексирования: Sun Apr 10 16:23:53 2016 Кодировка: koi8-r Поисковые слова: lightning |
We study the emission by dust and stars in the Large and Small Magellanic Clouds, a pair of low-metallicity nearby galaxies, as traced by their spatially resolved spectral energy distributions. This project combines Herschel Space Observatory PACS and SPIRE far-infrared photometry with other data at infrared and optical wavelengths (the data were obtained as part of the HERschel Inventory of The Agents of Galaxy Evolution survey; PI: M. Meixner). We build maps of dust, stellar luminosity, and mass of both Magellanic Clouds, and analyze the spatial distribution of dust/stellar luminosity and mass ratios. These ratios vary considerably throughout the galaxies, generally between the range 0.01 <= L dust/L * <= 0.6 and 10-4 <= M dust/M * <= 4 ц— 10-3. We observe that the dust/stellar ratios depend on the interstellar medium environment, such as the distance from currently or previously star-forming regions, and on the intensity of the interstellar radiation field. In addition, we construct star formation rate (SFR) maps, and find that the SFR is correlated with the dust/stellar luminosity and dust temperature in both galaxies, demonstrating the relation between star formation, dust emission, and heating, though these correlations exhibit substantial scatter.
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Copyright © 2012 Karl D. Gordon All Rights Reserved