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Discovery of Highly Obscured Galaxies in the Zone of Avoidance.pdf

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Discovery of Highly Obscured Galaxies in the Zone of Avoidance

a r X i v : 0 8 0 5 .2 5 9 4 v 1 [ a s t r o - p h ] 1 6 M a y 2 0 0 8 Accepted for publication in the Astronomical Journal Preprint typeset using LATEX style emulateapj v. 10/09/06 DISCOVERY OF HIGHLY OBSCURED GALAXIES IN THE ZONE OF AVOIDANCE F.R. Marleau1, A. Noriega-Crespo1, R. Paladini1, D. Clancy1, S. Carey1, S. Shenoy1, K.E. Kraemer2, T. Kuchar3, D.R. Mizuno3, and S. Price2 Accepted for publication in the Astronomical Journal ABSTRACT We report the discovery of twenty-five previously unknown galaxies in the Zone of Avoidance. Our systematic search for extended extra-galactic sources in the GLIMPSE and 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 Zone of Avoidance using mid-to-far infrared surveys. Subject headings: galaxies: distances and redshifts — large-scale structure of universe — infrared: galaxies 1. INTRODUCTION The last frontier in mapping the large-scale structure of the local Universe is the Zone of Avoidance (ZoA). Starting in the late 1980s, redshift surveys have provided an increasingly detailed picture of the large-scale str