Optically dim counterparts of hard X-ray selected AGNs

Details Optically dim counterparts of hard X-ray selected AGNs Optically dim counterparts of hard X-ray selected AGNs

2000-02-24

arxiv.org/abs/astro-ph/0002447v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, to appear in A&A Letters

Scientific paper

We present near-IR photometry and imaging observations of a small sample of sources identified in the BeppoSAX 5-10 keV survey (HELLAS) which resolves ~ 20-30% of the X-ray background at these energies. The near-IR data are combined with optical spectra and photometry. Only 40% of the sources in our sample have the blue, power law continuum typical of color-selected QSOs. The remaining 60% are dominated by a galactic component which, on the basis of the continuum colors and shape, have ages ranging from 10^9 to 10^10 years. The images show that the blue QSOs are pointlike at our angular resolution, while all the other sources are extended, consistent with their spectral appearance and low redshift. Since down to R=20 only about two thirds of the HELLAS sources have a counterpart, the preliminary HELLAS census comprises in roughly equal parts: i) blue QSOs (mostly at high redshifts); ii) optically dim, galaxy-dominated active nuclei (mostly at modest redshifts); and iii) empty fields (possibly highly absorbed QSOs at high redshifts).

Affiliated with

Also associated with

No associations

Rating

Optically dim counterparts of hard X-ray selected AGNs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Optically dim counterparts of hard X-ray selected AGNs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optically dim counterparts of hard X-ray selected AGNs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-358056