تقرير
Chandra counterparts of CANDELS GOODS-S sources
| العنوان: | Chandra counterparts of CANDELS GOODS-S sources |
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| المؤلفون: | Cappelluti, N., Comastri, A., Fontana, A., Zamorani, G., Amorin, R., Castellano, M., Merlin, E., Santini, P., Elbaz, D., Schreiber, C., Shu, X., Wang, T., Dunlop, J. S., Bourne, N., Bruce, V. A., Buitrago, F., Michałowski, Michał J., Derriere, S., Ferguson, H. C., Faber, S. M., Vito, F. |
| سنة النشر: | 2015 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Astrophysics of Galaxies |
| الوصف: | Improving the capabilities of detecting faint X-ray sources is fundamental to increase the statistics on faint high-z AGN and star-forming galaxies. We performed a simultaneous Maximum Likelihood PSF fit in the [0.5-2] keV and [2-7] keV energy bands of the 4 Ms{\em Chandra} Deep Field South (CDFS) data at the position of the 34930 CANDELS H-band selected galaxies. For each detected source we provide X-ray photometry and optical counterpart validation. We validated this technique by means of a raytracing simulation. We detected a total of 698 X-ray point-sources with a likelihood $\mathcal{L}$$>$4.98 (i.e. $>$2.7$\sigma$). We show that the prior knowledge of a deep sample of Optical-NIR galaxies leads to a significant increase of the detection of faint (i.e. $\sim$10$^{-17}$ cgs in the [0.5-2] keV band) sources with respect to "blind" X-ray detections. By including previous X-ray catalogs, this work increases the total number of X-ray sources detected in the 4 Ms CDFS, CANDELS area to 793, which represents the largest sample of extremely faint X-ray sources assembled to date. Our results suggest that a large fraction of the optical counterparts of our X-ray sources determined by likelihood ratio actually coincides with the priors used for the source detection. Most of the new detected sources are likely star-forming galaxies or faint absorbed AGN. We identified a few sources sources with putative photometric redshift z$>$4. Despite the low number statistics and the uncertainties on the photo-z, this sample significantly increases the number of X--ray selected candidate high-z AGN. Comment: 15 Pages, 10 Figures, Accepted by ApJ, version before editing, Catalog available at: http://www.astrodeep.eu/chandra-counterparts/ , CDS and www.astrodeep.edu |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/0004-637X/823/2/95 |
| URL الوصول: | http://arxiv.org/abs/1512.00510 |
| رقم الأكسشن: | edsarx.1512.00510 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/0004-637X/823/2/95 |
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