 |
 |
Astron. Astrophys. 359, 953-959 (2000)
EROs in the EIS fields
I. The AXAF (Chandra) deep field *
M. Scodeggio ** and
D.R. Silva
European Southern Observatory, Karl-Schwarzschild-Strasse 2 85748 Garching bei München, Germany (marcos@ifctr.mi.cnr.it, mscodegg,dsilva@eso.org)
Received 28 May 1999 / Accepted 14 April 2000
Abstract
The publicly available EIS-DEEP optical-NIR data for the AXAF
(Chandra) Deep Field have been used to construct samples of Extremely
Red Objects (EROs) using various single-band and multi-band color
criteria. In this work we define as EROs objects with colors
consistent with passively evolving elliptical galaxies at
![[FORMULA]](img1.gif)
1. The EROs surface densities we
derive are intermediate between previous published values, emphasizing
again the need for larger survey areas to constrain the effects of
possible large-scale structure. Although various single-color selected
samples can be derived, the EROs sample selected using
![[FORMULA]](img2.gif)
jointly is likely to contain the
highest fraction of passively evolving luminous field elliptical
galaxies at 1, or conversely, the
lowest fraction of lower redshift interlopers. The surface density of
this multi-band selected EROs sample is consistent with the conclusion
that little or no field elliptical volume density evolution has
occurred in the redshift range 0 ![[FORMULA]](img3.gif)
1.5.
However, extensive spectroscopic followup is necessary to confirm this
conclusion.
Key words: galaxies: elliptical and lenticular,
cD 
galaxies:
evolution
galaxies:
formation
cosmology: observations
* Based on observations collected at the European Southern Observatory, La Silla, Chile; ESO programs No. 61.A-9005 and 162.O-0917
** Current address: Istituto di Fisica Cosmica "G. Occhialini", via Bassini 15, 20133 Milano, Italy
Send offprint requests to: Marco Scodeggio
This article contains no SIMBAD objects.
Contents
- 1. Introduction
- 2. The data
- 3. Single-color selected EROs samples
- 4. A multi-color selected EROs sample
- 5. Summary
- Acknowledgements
- References
© European Southern Observatory (ESO) 2000
Online publication: July 13, 2000
helpdesk.link@springer.de