Optical/Near-IR Observations of a Deep Chandra Field Around the Blazar 1156+295

Details Optical/Near-IR Observations of a Deep Chandra Field Around the Blazar 1156+295 Optical/Near-IR Observations of a Deep Chandra Field Around the Blazar 1156+295

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001tysc.confe.132c&link_type=abstract

Two Years of Science with Chandra, Abstracts from the Symposium held in Washington, DC, 5-7 September, 2001, meeting abstract.

Statistics

Extragalactic Diffuse Emission And Surveys

Scientific paper

We present follow-up observations of a 60 ksec ACIS-I Chandra exposure centered on the gamma-ray blazar 1156+295. We have imaged the central 100 square arc minutes of the field in optical down to B/R ~26, and the central 48 square arc minutes in K down to K~21. We present and analyze the X-ray spectra, colors, and population statistics of the serendipitous sources found in the field. Our results are largely consistent with those of Mushotzky et al. (2000) and the Chandra Deep Fields. However, we find that a somewhat larger fraction (~25%) of our X-ray sources have no optical counterparts down to R≈ 26.5. Several (~60 %) of the objects with no optical identification, however, are detected in K at the level K ~19-21. These objects could be very high redshift (z>5) ojbects, or lower redshift (15 are typically very hard. The optical colors for most of the Chandra sources are blue (B-R<1), indicating some level of unobscured starburst or AGN activity. At faint X-ray flux levels (<2× 10-15 erg cm-2 sec-1), a new class of optically bright, red sources appears. Preliminary spectroscopy suggests that these are examples of the nearby "normal" galaxies found in other fields. The X-ray spectra of these sources are also typically hard. As an example of possible cosmic variance, however, we find that the fraction of optically bright sources with X-ray counterparts is significantly lower than that found by Barger et al. 2000 (~1 vs. 10 %). An accurate determination of the average value of this fraction is crucial for AGN lifetime and black hole accretion efficiency arguments.

Affiliated with

Also associated with

No associations

Rating

Optical/Near-IR Observations of a Deep Chandra Field Around the Blazar 1156+295 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 Optical/Near-IR Observations of a Deep Chandra Field Around the Blazar 1156+295, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical/Near-IR Observations of a Deep Chandra Field Around the Blazar 1156+295 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1163615