Abstract
We present results of optical follow-up observations of candidate ultra-luminous X-ray sources (ULXs). Using Keck optical spectroscopy, 17 of the candidates from the Colbert & Ptak (2002) catalog have been identified; this is one of the largest sets of optical identifications of such objects thus far. 15 are background active galactic nuclei (AGN); 2 are foreground stars in our Galaxy. These findings are compared with background and foreground object expectations, as derived from log N-log S relations. Also, the results are briefly discussed in terms of the spiral-galaxy/ULX connection.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 306-307 |
| Number of pages | 2 |
| Journal | Proceedings of the International Astronomical Union |
| Volume | 1 |
| Issue number | S230 |
| DOIs | |
| State | Published - 2005 |
Keywords
- Black hole physics
- Catalogs
- Galaxies: distances and redshifts
- Galaxies: individual (NGC 720, NGC 1316, NGC 1365, NGC 1399, NGC 2775, NGC 3266, IC 2597, NGC 3923, NGC 4151, NGC 4373, NGC 5128)
- Quasars: general
- X-rays: galaxies
ASJC Scopus subject areas
- Medicine (miscellaneous)
- Astronomy and Astrophysics
- Nutrition and Dietetics
- Public Health, Environmental and Occupational Health
- Space and Planetary Science
