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Large Scale Structure at 24 Microns in the SWIRE Survey

Masci, Frank J. (2006) Large Scale Structure at 24 Microns in the SWIRE Survey. In: Spitzer Space Telescope: New Views of the Cosmos. ASP Conference Series. Vol.357. Astronomical Society of the Pacific , San Francisco, CA, pp. 271-272. ISBN 978-1-583812-25-9.

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We present initial results of galaxy clustering at 24μm by analyzing statistics of the projected galaxy distribution from counts-in-cells. This study focuses on the ELAIS-North1 SWIRE field. The sample covers ≃5.9 deg^2 and contains 24,715 sources detected at 24μm to a 5.6σ limit of 250μJy (in the lowest coverage regions). We have explored clustering as a function of 3.6 - 24μm and 24μm flux density using angular-averaged two-point correlation functions derived from the variance of counts-in-cells on scales 0°.05-0°.7. Using a power-law parameterization, w_2(θ)=A(θ/deg)^(1-γ), we find [A,γ] = [(5.43±0.20)×10^(-4),2.01±0.02] for the full sample (1σ errors throughout). We have inverted Limber's equation and estimated a spatial correlation length of r_0=3.32±0.19 h^(-1)Mpc for the full sample, assuming stable clustering and a redshift model consistent with observed 24μm counts. We also find that blue [f_ν(24)/f_ν(3.6)≤5.5] and red [f_ν(24)/f_ν(3.6)≥6.5] galaxies have the lowest and highest r_0 values respectively, implying that redder galaxies are more clustered (by a factor of ≈3 on scales ≳ 0°.2). Overall, the clustering estimates are smaller than those derived from optical surveys, but in agreement with results from IRAS and ISO in the mid-infrared. This extends the notion to higher redshifts that infrared selected surveys show weaker clustering than optical surveys.

Item Type:Book Section
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Masci, Frank J.0000-0002-8532-9395
Additional Information:© 2006 Astronomical Society of the Pacific. Submitted on 8 Mar 2005. Support for this work was provided by NASA through an award issued by the Jet Propulsion Laboratory, California Institute of Technology under NASA contract 1407.
Group:Infrared Processing and Analysis Center (IPAC)
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Series Name:ASP Conference Series
Record Number:CaltechAUTHORS:20110726-131900633
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Official Citation:Large Scale Structure at 24 Microns in the SWIRE Survey Authors: Masci, F. J.; SWIRE Team Publication: The Spitzer Space Telescope: New Views of the Cosmos ASP Conference Series, Volume 357, proceedings of the conference held 9-12 November, 2004 in Pasadena, California, USA. Edited by L. Armus and W.T. Reach. San Francisco: Astronomical Society of the Pacific, 2006., p.271 Publication Date: 12/2006 Origin: ASP Bibliographic Code:2006ASPC..357..271M
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24549
Deposited By: Ruth Sustaita
Deposited On:27 Jul 2011 14:50
Last Modified:03 Oct 2019 02:57

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