Bibliographic Details
| Title: |
Ultraluminous X-ray sources out to z~0.3 in the COSMOS field |
| Authors: |
Mainieri, V., Vignali, C., Merloni, A., Civano, F., Puccetti, S., Brusa, M., Gilli, R., Bolzonella, M., Comastri, A., Zamorani, G., Aller, M., Carollo, M., Scarlata, C., Elvis, M., Aldcroft, T. L., Cappelluti, N., Fabbiano, G., Finoguenov, A., Fiore, F., Fruscione, A., Koekemoer, A. M., Contini, T., Kneib, J. P., Fevre, O. Le, Lilly, S., Renzini, A., Scodeggio, M., Bardelli, S., Bongiorno, A., Caputi, K., Coppa, G., Cucciati, O., de la Torre, S., de Ravel, L., Franzetti, P., Garilli, B., Iovino, A., Kampczyk, P., Knobel, C., Kovac, K., Lamareille, F., Borgne, J. F. Le, Brun, V. Le, Maier, C., Mignoli, M., Pello, R., Peng, Y., Montero, E. Perez, Ricciardelli, E., Silverman, J. D., Tanaka, M., Tasca, L., Tresse, L., Vergani, D., Zucca, E., Capak, P., Ilbert, O., Impey, C., Salvato, M., Scoville, N., Taniguchi, Y., Trump, J. |
| Publication Year: |
2010 |
| Collection: |
Astrophysics |
| Subject Terms: |
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena |
| More Details: |
Using Chandra observations we have identified a sample of seven off-nuclear X-ray sources, in the redshift range z=0.072-0.283, located within optically bright galaxies in the COSMOS Survey. Using the multi-wavelength coverage available in the COSMOS field, we study the properties of the host galaxies of these ULXs. In detail, we derived their star formation rate from H_alpha measurements and their stellar masses using SED fitting techniques with the aim to compute the probability to have an off-nuclear source based on the host galaxy properties. We divide the host galaxies in different morphological classes using the available ACS/HST imaging. We find that our ULXs candidates are located in regions of the SFR versus M$_star$ plane where one or more off-nuclear detectable sources are expected. From a morphological analysis of the ACS imaging and the use of rest-frame colours, we find that our ULXs are hosted both in late and early type galaxies. Finally, we find that the fraction of galaxies hosting a ULX ranges from ~0.5% to ~0.2% going from L[0.5-2 keV]=3 x 10^39 erg s^-1 to L[0.5-2 keV]= 2 x 10^40 erg s^-1.
Comment: 10 pages, 9 figures, accepted for publication in Astronomy & Astrophysics |
| Document Type: |
Working Paper |
| DOI: |
10.1051/0004-6361/200912544 |
| Access URL: |
http://arxiv.org/abs/1002.4299 |
| Accession Number: |
edsarx.1002.4299 |
| Database: |
arXiv |
