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| Content Provider | Springer Nature Link |
|---|---|
| Author | Srivastava, P. K. Pramesh Rao, A. |
| Copyright Year | 2010 |
| Abstract | W51 is a giant radio complex lying along the tangent to the Sagitarius arm at a distance of about 7 kpc from the Sun, with an extension of about 1° in the sky. It is divided into three components A, B, C where W51A and W51B consist of many compact HII regions while W51C is a supernova remnant. We have made continuum radio observations of these HII regions of the W51 complex at 240, 610, 1060 and 1400 MHz using GMRT with lower resolution (20″ × 15″) at the lowest frequency. The observed spectra of the prominent thermal subcomponents of W51 have been fitted to a free-free emission spectrum and their physical properties like electron temperatures and emission measures have been estimated. The electron temperatures from continuum spectra are found to be lower than the temperatures reported from radio recombination line (RRL) studies of these HII regions indicating the need for a filling factor even at this resolution. Also, the observed brightness at 240 MHz is found to be higher than expected from the best fits suggesting the need for a multicomponent model for the region. |
| Starting Page | 43 |
| Ending Page | 58 |
| Page Count | 16 |
| File Format | |
| ISSN | 02506335 |
| Journal | Journal of Astrophysics and Astronomy |
| Volume Number | 31 |
| Issue Number | 1 |
| e-ISSN | 09737758 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2010-04-25 |
| Publisher Institution | Indian Academy of Sciences |
| Publisher Place | India |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | ISM HII regions radio continuum individual (W51) Astrophysics and Astroparticles Astronomy, Observations and Techniques |
| Content Type | Text |
| Resource Type | Article |
| Subject | Astronomy and Astrophysics Space and Planetary Science |
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