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D.M. Alexander, W.N. Brandt, A.E. Hornschemeier, G.P. Garmire, D.P. Schneider (PSU), A.J. Barger (IfA), P.S. Broos (PSU), L.L. Cowie (IfA), L.K. Townsley (PSU), M.W. Bautz (MIT), D.N. Burrows, G. Chartas, E.D. Feigelson (PSU), R. Griffiths (Carnegie Mellon), D. Lumb (ESTEC), J.A. Nousek, L.W. Ramsey (PSU), W.L.W. Sargent (Palomar)
We present a multi-wavelength analysis of the Chandra study in the Hubble Deep Field (HDF) and its environs (the Caltech region) obtained using 225 ks of data collected by the Advanced CCD Imaging Spectrometer (ACIS). We have detected 82 sources within this region and have positionally cross-correlated these sources with multi-wavelength source lists.
We focus on the possible AGN detections of 5 Chandra sources. We argue that one of these sources is a high-redshift QSO II candidate object based on its X-ray, optical and infrared colours. The other 4 sources are all extremely red objects (EROs, R-K>5) and have hard X-ray colours. The possible identification of AGN activity in these objects (~10% of the EROs in this region) could prove important from the viewpoints of understanding the nature of EROs and the nature of the hard X-ray background.
We acknowledge the financial support of NASA grant NAS 8-38252 and the NSF CAREERS grant AST-998 3783.