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Chandra Deep Field South: the optically faint population
Author(s) -
Mainieri V.,
Rosati P.,
ino M.,
Szokoly G.,
Bergeron J.,
Hasinger G.,
Lehmann I.,
Tozzi P.
Publication year - 2003
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200310006
Subject(s) - photometry (optics) , physics , chandra deep field south , astrophysics , population , astronomy , hubble deep field , active galactic nucleus , stars , galaxy , medicine , environmental health , hubble space telescope
A not negligible fraction (∼15%) of X‐ray sources detected in the 1 Msec observation of the Chandra Deep Field South (CDFS) are not detected down to R ≃ 27, however they are registered in deep near‐IR imaging.We use deep multicolor photometry from the VLT (FORS+ISAAC instruments), covering a broad wavelength range, to discuss the adequacy of such techniques for X‐ray selected sources and to constrain the nature of this optically faint population.