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Chandra counterparts of CANDELS GOODS-S sources | | N. Cappelluti
; A. Comastri
; A. Fontana
; G. Zamorani
; R. Amorin
; M. Castellano
; E. Merlin
; P. Santini
; D. Elbaz
; C. Schreiber
; X. Shu
; T. Wang
; J. S. Dunlop
; N. Bourne
; V. A. Bruce
; F. Buitrago
; Michał J. Michałowski
; S. Derriere
; H. C. Ferguson
; S. M. Faber
; F. Vito
; | | Date: |
2 Dec 2015 | | Abstract: | 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 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, this sample significantly increases the number of X--ray selected
candidate high-z AGN. | | Source: | arXiv, 1512.0510 | | Services: | Forum | Review | PDF | Favorites | |
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