X-ray sources in the Hubble Deep Field detected by Chandra

A. E. Hornschemeier, W. N. Brandt, G. P. Garmire, D. P. Schneider, P. S. Broos, L. K. Townsley, M. W. Bautz, D. N. Burrows, G. Chartas, E. D. Feigelson, R. Griffiths, D. Lumb, J. A. Nousek, W. L.W. Sargent

Research output: Contribution to journalArticlepeer-review

88 Scopus citations


We present first results from an X-ray study of the Hubble Deep Field North (HDF-N) and its environs obtained using 166 ks of data collected by the Advanced CCD Imaging Spectrometer (ACIS) on board the Chandra X-Ray Observatory. This is the deepest X-ray observation ever reported, and in the HDF-N itself we detect six X-ray sources down to a 0.5-8 keV flux limit of ≈4 × 10-16 ergs cm-2 s-1. Comparing these sources with objects seen in multiwavelength HDF-N studies shows positional coincidences with the extremely red object NICMOS J123651.74 + 621221.4, an active galactic nucleus (AGN), three elliptical galaxies, and one nearby spiral galaxy. The X-ray emission from the ellipticals is consistent with that expected from a hot interstellar medium, and the spiral galaxy emission may arise from a "super-Eddington" X-ray binary or ultraluminous supernova remnant. Four of the X-ray sources have been detected at radio wavelengths. We also place X-ray upper limits on AGN candidates found in the HDF-N, and we present the tightest constraints yet on X-ray emission from the SCUBA submillimeter source population. None of the 10 high-significance submillimeter sources reported in the HDF-N and its vicinity is detected with the Chandra ACIS. These sources appear to be dominated by star formation or have AGNs with Compton-thick tori and little circumnuclear X-ray scattering.

Original languageEnglish (US)
Pages (from-to)49-53
Number of pages5
JournalAstrophysical Journal
Issue number1 PART 1
StatePublished - Sep 20 2000

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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