Tracing the outer disk of NGC300: An ultraviolet view
- Title
- Tracing the outer disk of NGC300: An ultraviolet view
- Creator
- Mondal C.; Subramaniam A.; George K.
- Description
- We present an ultra-violet (UV) study of the galaxy NGC300 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, HI and mid-infrared (3.6 ?m) wavelengths. Our study identified extended features in the outer disk, with the UV disk extending up to a radius of 12 kpc (> 2 R25). 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 ?m, 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 ? 2 R25). The identified UV sources show an age range between 1300 Myr with a peak at 25 Myr and a mass range between 10 3M? to 10 6M?, 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 ? 2 R25 radius. We conclude that NGC300 has an extended UV disk, mainly populated by young low mass sources. The star formation rate is measured to be ?0.46M?/yr which is comparable to its near optical twin M33. 2019, Indian Academy of Sciences.
- Source
- Journal of Astrophysics and Astronomy, Vol-40, No. 4
- Date
- 2019-01-01
- Publisher
- Springer
- Subject
- Individual galaxies; spiral galaxies; star formation; XUV disk
- Coverage
- Mondal C., Indian Institute of Astrophysics, 2nd Block, Koramangala, 560 034, Bengaluru, India, Pondicherry University, R.V. Nagar, Kalapet, 605 014, India; Subramaniam A., Indian Institute of Astrophysics, 2nd Block, Koramangala, 560 034, Bengaluru, India; George K., Department of Physics, Christ University, Bengaluru, India
- Rights
- Restricted Access
- Relation
- ISSN: 2506335
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Mondal C.; Subramaniam A.; George K., “Tracing the outer disk of NGC300: An ultraviolet view,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 23, 2025, https://archives.christuniversity.in/items/show/16612.