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Discovery of highly obscured galaxies in the zone of avoidance

Marleau, F. R. and Noriega-Crespo, A. and Paladini, R. and Clancy, D. and Carey, S. and Shenoy, S. and Kraemer, K. E. and Kuchar, T. and Mizuno, D. R. and Price, S. (2008) Discovery of highly obscured galaxies in the zone of avoidance. Astronomical Journal, 136 (2). pp. 662-675. ISSN 0004-6256. doi:10.1088/0004-6256/136/2/662.

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We report the discovery of 25 previously unknown galaxies in the zone of avoidance (ZoA). Our systematic search for extended extragalactic sources in the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) and MIPS Galactic Plane Survey (MIPSGAL) mid-infrared surveys of the Galactic plane has revealed two overdensities of these sources, located around l ~ 47° and 55° and |b| ≾ 1° in the Sagitta-Aquila region. These overdensities are consistent with the local large-scale structure found at similar Galactic longitude and extending from |b| ~ 4 to 40°. We show that the infrared spectral energy distribution of these sources is indeed consistent with those of normal galaxies. Photometric estimates of their redshift indicate that the majority of these galaxies are found in the redshift range z ≃ 0.01-0.05, with one source located at z ≃ 0.07. Comparison with known sources in the local universe reveals that these galaxies are located at similar overdensities in redshift space. These new galaxies are the first evidence of a bridge linking the large-scale structure between both sides of the Galactic plane at very low Galactic latitude and clearly demonstrate the feasibility of detecting galaxies in the ZoA using mid-to-far infrared surveys.

Item Type:Article
Related URLs:
URLURL TypeDescription
Noriega-Crespo, A.0000-0002-6296-8960
Paladini, R.0000-0002-5158-243X
Carey, S.0000-0002-0221-6871
Additional Information:© 2008 The American Astronomical Society. Received 2007 September 25, accepted for publication 2008 May 6. Published 2008 July 8. Print publication: Issue 2 (2008 August). We thank an anonymous referee for helpful suggestions on improving the manuscript. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:galaxies: distances and redshifts – infrared: galaxies – large-scale structure of universe
Issue or Number:2
Record Number:CaltechAUTHORS:MARaj08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13234
Deposited On:05 Feb 2009 06:57
Last Modified:08 Nov 2021 22:36

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