Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7159
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dc.contributor.authorMondal, Chayan-
dc.contributor.authorSubramaniam, A-
dc.contributor.authorGeorge, K-
dc.date.accessioned2020-11-17T14:27:38Z-
dc.date.available2020-11-17T14:27:38Z-
dc.date.issued2019-07-11-
dc.identifier.citationJournal of Astrophysics and Astronomy, Vol. 40, No. 4, pp. 1-17en_US
dc.identifier.issn0250-6335-
dc.identifier.urihttp://prints.iiap.res.in/handle/2248/7159-
dc.descriptionOpen Access © Indian Academy of Sciences https://doi.org/10.1007/s12036-019-9603-4en_US
dc.description.abstractWe present an ultra-violet (UV) study of the galaxy NGC 300 using GALEX far-UV (FUV) and near-UV (NUV) observations. We studied the nature of UV emission in the galaxy and correlated it with optical, H I and mid-infrared (3.6 μm) wavelengths. Our study identified extended features in the outer disk, with the UV disk extending up to a radius of 12 kpc (>2R25). We estimated the FUV and NUV disk scale-length as 3.05 ± 0.27 kpc and 2.66 ± 0.20 kpc respectively. The scale-length in FUV is 2.3 times larger than that at 3.6 μm, and we also find the disk to gradually become flatter from longer to shorter wavelengths. We performed a statistical source subtraction to eliminate the background contaminants and identified 261 unresolved UV sources between the radii 5.3 kpc and 10 kpc (1 ∼ 2R25). The identified UV sources show an age range between 1–300 Myr with a peak at 25 Myr and a mass range between 103M to 106M , estimated using Starburst99 models. The north-eastern spiral arm is found to be populated by young low mass sources suggesting that the star formation in this spiral arm is a recent phenomenon. The UV emission beyond the R25 radius has contribution from these low mass sources and is extended up to ∼2R25 radius. We conclude that NGC 300 has an extended UV disk, mainly populated by young low mass sources. The star formation rate is measured to be ∼0.46 M /yr which is comparable to its near optical twin M33.en_US
dc.language.isoenen_US
dc.publisherIndian Academy of Sciencesen_US
dc.subjectIndividual galaxiesen_US
dc.subjectspiral galaxiesen_US
dc.subjectstar formationen_US
dc.subjectXUV disken_US
dc.titleTracing the outer disk of NGC 300: an ultraviolet viewen_US
dc.typeArticleen_US
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