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Title:
An extremely red r(1/4) galaxy in the test image of the Hubble Deep Field South
Authors:
TREU, T.; STIAVELLI, M.; WALKER, A. R.; WILLIAMS, R. E.; BAUM, S. A.; BERNSTEIN, G.; BLACKER, B. S.; CAROLLO, C. M.; CASERTANO, S.; DICKINSON, M. E.; DEMELLO, D. F.; FERGUSON, H. C.; FRUCHTER, A. S.; LUCAS, R. A.; MACKENTY, J.; MADAU, P.; POSTMAN, M.
Affiliation:
AA( Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126, Pisa, Italy (e-mail: treu@cibs.sns.it; mstiavel@astro.sns.it); Space Telescope Science Institute, 3700 San Martin Dr., 21218 MD, USA (e-mail: treu@stsci.edu; mstiavel@stsci.edu; wms@stsci.edu)), AB( Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126, Pisa, Italy (e-mail: treu@cibs.sns.it; mstiavel@astro.sns.it); Space Telescope Science Institute, 3700 San Martin Dr., 21218 MD, USA (e-mail: treu@stsci.edu; mstiavel@stsci.edu; wms@stsci.edu)), AC(Cerro Tololo Inter-American Observatory, NOAO, Casilla 603, La Serena, Chile (e-mail: awalker@noao.edu)), AD(Space Telescope Science Institute, 3700 San Martin Dr., 21218 MD, USA (e-mail: treu@stsci.edu; mstiavel@stsci.edu; wms@stsci.edu)), AE(Space Telescope Science Institute, 3700 San Martin Dr., 21218 MD, USA (e-mail: treu@stsci.edu; mstiavel@stsci.edu; wms@stsci.edu)), AF(University of Michigan, Department of Astronomy, 830 Dennison Building, Ann Arbor, MI 48109, USA), AG(Space Telescope Science Institute, 3700 San Martin Dr., 21218 MD, USA (e-mail: treu@stsci.edu; mstiavel@stsci.edu; wms@stsci.edu)), AH(Johns Hopkins University, 3701 San Martin Dr., 21218 MD, USA), AI(Space Telescope Science Institute, 3700 San Martin Dr., 21218 MD, USA (e-mail: treu@stsci.edu; mstiavel@stsci.edu; wms@stsci.edu); ), AJ(Space Telescope Science Institute, 3700 San Martin Dr., 21218 MD, USA (e-mail: treu@stsci.edu; mstiavel@stsci.edu; wms@stsci.edu)), AK(Space Telescope Science Institute, 3700 San Martin Dr., 21218 MD, USA (e-mail: treu@stsci.edu; mstiavel@stsci.edu; wms@stsci.edu)), AL(Space Telescope Science Institute, 3700 San Martin Dr., 21218 MD, USA (e-mail: treu@stsci.edu; mstiavel@stsci.edu; wms@stsci.edu)), AM(Space Telescope Science Institute, 3700 San Martin Dr., 21218 MD, USA (e-mail: treu@stsci.edu; mstiavel@stsci.edu; wms@stsci.edu)), AN(Space Telescope Science Institute, 3700 San Martin Dr., 21218 MD, USA (e-mail: treu@stsci.edu; mstiavel@stsci.edu; wms@stsci.edu)), AO(Space Telescope Science Institute, 3700 San Martin Dr., 21218 MD, USA (e-mail: treu@stsci.edu; mstiavel@stsci.edu; wms@stsci.edu)), AP(Space Telescope Science Institute, 3700 San Martin Dr., 21218 MD, USA (e-mail: treu@stsci.edu; mstiavel@stsci.edu; wms@stsci.edu)), AQ(Space Telescope Science Institute, 3700 San Martin Dr., 21218 MD, USA (e-mail: treu@stsci.edu; mstiavel@stsci.edu; wms@stsci.edu))
Journal:
Astronomy and Astrophysics, v.340, p.L10-L14 (1998)
Publication Date:
12/1998
Origin:
A&A
A&A Keywords:
GALAXIES: ELLIPTICAL AND LENTICULAR, CD, INFRARED: GALAXIES, GALAXIES: FORMATION, COSMOLOGY: OBSERVATIONS, EARLY UNIVERSE
Abstract Copyright:
(c) 1998: Astronomy & Astrophysics
Bibliographic Code:
1998A&A...340L..10T

Abstract

We report the serendipitous discovery of an extremely red object in the Hubble Deep Field South (HDFS) Test NICMOS (Near Infrared Camera and Multi Object Spectrograph) field of view. The object is resolved in the NICMOS image and has a light profile very well described by an r(1/4) law with effective radius r_{e}=0farcs 20+/-0.05 and H_AB=21.7+/-0.1 magnitudes. In contrast, the galaxy is undetected in the R and I band ground based images taken at the CTIO 4 m Blanco Telescope, giving a lower limit to the color of (R-H)_AB>3.9 and (I-H)_AB>3.5 at the 95% confidence level. The colors of a range of synthetic galactic spectra are computed, showing that the object is likely to be an ``old'' elliptical galaxy at redshift z>~ 1.7. Alternatively the colors can be reproduced by an ``old'' elliptical galaxy at somewhat lower redshift (>~ 1) with significant amount of dust, or by a younger galaxy at higher redshift. This object represents a very interesting target for future VLT observations.

Based on observations collected with the NASA/ESA HST, obtained at the STScI, which is operated by AURA, under NASA contract NAS5-26555 and at the CTIO, NOAO, which is operated by AURA, under cooperative agreement with the NSF.

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