Spitzer IRAC survey of the galactic center Virtual Observatory Resource

Authors
  1. Ramirez S.V.
  2. Arendt R.G.
  3. Sellgren K.
  4. Stolovy S.R.
  5. Cotera A.,Smith H.A.
  6. Yusef-Zadeh F.
  7. Published by
    CDS
Abstract

We have obtained Spitzer IRAC observations of the central 2.0{deg}x1.4{deg} (~280x200pc) of the Galaxy at 3.6-8.0um. A point-source catalog of 1065565 objects is presented. The catalog includes magnitudes for the point sources at 3.6, 4.5, 5.8, and 8.0um, as well as JHKs photometry from Two Micron All Sky Survey (2MASS). The point-source catalog is confusion limited with average limits of 12.4, 12.1, 11.7, and 11.2mag for [3.6], [4.5], [5.8], and [8.0], respectively. We find that the confusion limits are spatially variable because of stellar surface density, background surface brightness level, and extinction variations across the survey region. The overall distribution of point-source density with Galactic latitude and longitude is essentially constant, but structure does appear when sources of different magnitude ranges are selected. Bright stars show a steep decreasing gradient with Galactic latitude and a slow decreasing gradient with Galactic longitude, with a peak at the position of the Galactic center. From IRAC color-magnitude and color-color diagrams, we conclude that most of the point sources in our catalog have IRAC magnitudes and colors characteristic of red giant and asymptotic giant branch (AGB) stars.

Keywords
  1. astronomical-object-identification
  2. surveys
  3. infrared-photometry
Bibliographic source Bibcode
2008ApJS..175..147R
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/II/295
IVOA Identifier IVOID
ivo://CDS.VizieR/II/295

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http://vizieridia.saao.ac.za/viz-bin/conesearch/II/295/GC-IRAC?

History

2010-04-23T10:50:36Z
Resource record created
2010-04-23T10:50:36Z
Created
2017-06-01T08:53:12Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr