An ultra-soft X-ray source (RX 215319-1514) and discovery of a narrow line Seyfert 1 galaxy
| dc.creator | Singh, Kulinder Pal | |
| dc.creator | Jones, Laurence R. | |
| dc.date | 1999-10-27 | |
| dc.date.accessioned | 2026-07-07T02:34:05Z | |
| dc.date.available | 2026-07-07T02:34:05Z | |
| dc.description | Two optical candidates - a galaxy and a star, are found within the error circle of the X-ray source position of an ultra-soft X-ray source discovered with ROSAT. Optical spectroscopy of the two candidates reveals that a) the galaxy is a narrow-line Seyfert type 1 galaxy, and b) the star is a late A-type or an early F-type. The Fx/Fopt ratio is too high for the star to be the counterpart of the X-ray source, but consistent with that for an active galaxy. Although higher resolution X-ray imaging of the region is needed to definitely settle the question of the counterpart of the X-ray source, the narrow-line Seyfert 1 galaxy is the best candidate. The spectral properties of the newly discovered narrow-line Seyfert 1 galaxy are also presented, including its extreme X-ray power law spectral (photon) index > 4. | |
| dc.description | 8 pages, 7 figures, Accepted for publication in MNRAS | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9910486 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9910486 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/15106 | |
| dc.subject | Astrophysics | |
| dc.title | An ultra-soft X-ray source (RX 215319-1514) and discovery of a narrow line Seyfert 1 galaxy | |
| dc.type | text |