Hard X-ray observations of Extremely Red Objects
Abstract
Extremely Red Objects (EROs, R-K>5) constitute a heterogeneous class of extragalactic sources including high redshift elliptical galaxies, dusty star-forming systems and heavily obscured AGNs. Hard X-ray observations provide an unique and powerful tool to uncover obscured nuclear or star-forming activity. We present the results of XMM-Newton observations of the largest sample of EROs available to date (about 450 objects over a contiguous area of 700 arcmin2). Five of the 46 hard X-ray selected sources brighter than 3x 10-15 cgs in the 2-10 keV band, are associated with EROs. All of the X-ray detected EROs show rather extreme X-ray-to-optical flux ratios, suggesting the presence of highly obscured AGN activity. We also report on the X-ray stacking analysis of spectroscopically identified EROs in the Chandra Deep Field South.
- Publication:
-
Astronomische Nachrichten
- Pub Date:
- 2003
- DOI:
- 10.1002/asna.200310029
- arXiv:
- arXiv:astro-ph/0211307
- Bibcode:
- 2003AN....324..113B
- Keywords:
-
- galaxies: active;
- galaxies: starburst;
- surveys;
- X-rays;
- Astrophysics
- E-Print:
- 4 pages, 3 figures. Proceedings for the "X-ray Surveys: in the light of new observatories" workshop. To be published in Astron. Nachrichten