/ftp/cats/A+A/612/A81



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J/A+A/612/A81       NGC 300 giant molecular clouds               (Riener+, 2018)
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Beginning of ReadMe : J/A+A/612/A81 NGC 300 giant dust clouds (Riener+, 2018) ================================================================================ Gathering dust: A galaxy-wide study of dust emission from cloud complexes in NGC 300. Riener M., Faesi C.M., Forbrich J., Lada C.J. <Astron. Astrophys. 612, A81 (2018)> =2018A&A...612A..81R (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Galaxies, nearby Keywords: methods: observational - galaxies: star formation - ISM: clouds Abstract: We use multi-band observations by the Herschel Space Observatory to study the dust emission properties of the nearby spiral galaxy NGC 300. We compile a first catalogue of the population of giant dust clouds (GDCs) in NGC 300, including temperature and mass estimates, and give an estimate of the total dust mass of the galaxy. We carried out source detection with the multiwavelength source extraction algorithm getsources. We calculated physical properties, including mass and temperature, of the GDCs from five-band Herschel PACS and SPIRE observations from 100-500mum; the final size and mass estimates are based on the observations at 250mum that have an effective spatial resolution of  170pc. We correlated our final catalogue of GDCs to pre-existing catalogues of HII regions to infer the number of GDCs associated with high-mass star formation and determined the Halpha emission of the GDCs. Our final catalogue of GDCs includes 146 sources, 90 of which are associated with known HII regions. We find that the dust masses of the GDCs are completely dominated by the cold dust component and range from  1.1x10^3^ to 1.4x10^4^M_sun_. The GDCs have effective temperatures of  13-23K and show a distinct cold dust effective temperature gradient from the centre towards the outer parts of the stellar disk. We find that the population of GDCs in our catalogue constitutes  16% of the total dust mass of NGC 300, which we estimate to be about 5.4x10^6^M_sun. At least about 87% of our GDCs have a high enough average dust mass surface density to provide sufficient shielding to harbour molecular clouds. We compare our results to previous pointed molecular gas observations in NGC 300 and results from other nearby galaxies and also conclude that it is very likely that most of our GDCs are associated with complexes of giant molecular clouds. Description: We obtained photometric observations of NGC 300 with the Herschel Space Observatory (PI: Jan Forbrich) with two of its instruments,the Spectral and Photometric Imaging Receiver (SPIRE) and the Photodetector Array Camera and Spectrometer (PACS). The SPIRE observations took place on 2012 May 11 with a total exposure time of 4558s. The two PACS observations were carried out on 2012 June 25 with a total exposure time of 3245 and 3803s.