XMM-Newton image of the Daddi Field
Minimum credit line: Image courtesy of M. Brusa, A. Comastri (INAF-OAB Bologna, Italy), the Hellas2Xmm team, ESO and ESA. (for details, see Conditions of Use).
Credit: ESA/XMM-Newton, CC BY-SA 3.0 IGO
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| About this Image |
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A medium-deep (about 60 ks) XMM-Newton X-ray image of the "Daddi" field: a carefully selected area of the sky extensively observed in the optical and near-infrared. Deep K-band (2.2 micron) photometry allowed to identify a sizeable sample of Extremely Red Objects (EROs) which are defined on the basis of a color criterium (R-K > 5) and thus extremely faint in the R band, sometimes below the detection limit of deep optical imaging. Having the colors expected for high-z (> 1) elliptical galaxies they can be used as tracers of massive galaxy formation at early cosmological epochs. However a significant fraction of EROs may also be high-z starbursts and Active Galactic Nuclei (AGN) strongly reddened by dust extinction. Indeed the multiwavelength follow-up observations of deep Chandra surveys allowed to identify several tens of X-ray emitting (presumably AGN) with EROs colors. The XMM-Newton survey of the Daddi field has been conceived to statistically investigate the fraction of X-ray emitting EROs among an optically selected sample. The color-coded X-ray image has been obtained combining pn and MOS data in three energy bands (0.3-1.5 keV, 1.5-2.5 keV; 2.5-8 keV; red, green, blue, respectively). The image is about 30 x 30 arcminutes in size. Thanks to the high-energy troughput of XMM-Newton several EROs have been clearly detected in the X-rays with a relatively hard spectrum (blue) indicating the presence of obscuration. A detailed analysis of their properties is in progress, and VIMOS spectroscopy is planned at ESO/VLT. As and example, optical and infrared imaging along with VLT spectroscopy of an X-ray emitting ERO detected in the HELLAS2XMM survey are shown in side panels. The bright near-infrared source is almost invisible in the R band image. Even more interesting appears to be the optical spectrum where narrow optical emission lines are superimposed on a red continuum.
Investigator(s): M. Brusa, A. Comastri
| For More Information |
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- Read the Journal article
- Detailed description of this image
- Query XSA archive for XMM-Newton data in the field of Daddi field
- For unfamiliar terms, visit the XMM-Newton Astronomical Glossary
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