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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 100-500µm; the final size and mass estimates are based on the observations at 250µm 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 Hα 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 ∼1.1x103 to 1.4x104M. 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 5.4x106M_☉. 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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tableb1.dat 181 146 Catalogue of giant dust clouds figd1.pdf 512 36329 Footprint of GDCs
See also: J/ApJ/821/125 : SMA obs. of giant molecular clouds in NGC 300 (Faesi+, 2016) Byte-by-byte Description of file: tableb1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq [1/146] Giant dust cloud (GDC) catalog identifier 5- 7 A3 --- f_Seq Footnotes (1) 9- 16 F8.5 deg RAdeg Right Ascension in decimal degrees (J2000) 18- 26 F9.5 deg DEdeg Declination in decimal degrees (J2000) 28 A1 --- l_F100 [<] Limit flag on F100 29- 34 F6.1 mJy F100 ?=- Flux at 100 microns 36- 39 F4.1 mJy e_F100 ? Uncertainty in F100 41 A1 --- l_F160 [<] Limit flag on F160 42- 47 F6.1 mJy F160 ?=- Flux at 160 microns 49- 52 F4.1 mJy e_F160 ? Uncertainty in F160 54 A1 --- l_F250 [<] Limit flag on F250 55- 59 F5.1 mJy F250 Flux at 250 microns 61- 64 F4.1 mJy e_F250 ? Uncertainty in F250 66 A1 --- l_F350 [<] Limit flag on F350 67- 71 F5.1 mJy F350 Flux at 350 microns 73- 76 F4.1 mJy e_F350 ? Uncertainty in F350 78 A1 --- l_F500 [<] Limit flag on F500 79- 83 F5.1 mJy F500 Flux at 500 microns 85- 88 F4.1 mJy e_F500 ? Uncertainty in F500 90- 93 F4.1 arcsec amaj Size estimate of major axis 95- 98 F4.1 arcsec bmin Size estimate of minor axis 100-104 F5.1 deg theta Rotational angle (east of the vertical axis) of amaj 106-110 F5.3 kpc D Deprojected galactocentric distance 112-116 F5.1 pc Deq Diameter of equivalent circular area 118-122 F5.2 K Tcold ?=- Cold dust effective temperature 124-127 F4.1 1000Msun Mdust ?=- Dust mass 129-131 F3.1 1000Msun e_Mdust ? Uncertainty in Mdust 133-136 F4.1 mJy F24 Flux at 24 microns 138-140 F3.1 mJy e_F24 Uncertainty in F24 142 A1 --- l_FHa [<] Limit flag on FHa 143-147 F5.1 10-17W/m2 FHa Halpha flux (in 10-14erg/cm2/s) 149-152 F4.1 10-17W/m2 e_FHa ? Uncertainty in FHa (in 10-14erg/cm2/s) 154-181 A28 --- HII Associated Deharveng et al. (1988A&AS...73..407D) HII regions ([DCL88] NNNA in Simbad) (2)
Note (1): Footnotes as follows: a = Sources labelled as tentative by getsources b = Sources added from source extraction for SPIRE-images only c = Strongly deblended with another discarded source candidate; flux of discarded source candidate was added to this source d = Position incorrectly shifted due to background galaxy e = Uncertain temperature estimate f = Size estimate likely too high Note (2): From Deharveng et al. (1988A&AS...73..407D); (D), (M), (N) indicate detections, marginal detections and non-detections in CO(J=2-1), respectively, from Faesi et al. (2014ApJ...789...81F)
Acknowledgements: Manuel Riener, riener(at)mpia.de
(End) Manuel Riener [MPIA, Germany], Patricia Vannier [CDS] 22-Nov-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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