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Exploring Infrared Properties of Giant Low Surface Brightness Galaxies

Rahman, Nurur and Howell, Justin H. and Helou, George and Mazzarella, Joseph M. and Buckalew, Brent (2007) Exploring Infrared Properties of Giant Low Surface Brightness Galaxies. Astrophysical Journal, 663 (2). pp. 908-923. ISSN 0004-637X. doi:10.1086/518554.

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We present an analysis of Spitzer Space Telescope observations of the three low surface brightness (LSB) optical giant galaxies Malin 1, UGC 6614, and UGC 9024. Mid- and far-infrared morphology, spectral energy distributions, and integrated colors are used to derive the dust mass, dust-to-gas mass ratio, total infrared luminosity, and star formation rate (SFR). We also investigate UGC 6879, which is intermediate between high surface brightness (HSB) and LSB galaxies. The 8 μm images indicate that polycyclic aromatic hydrocarbon (PAH) molecules are present in the central regions of all three metal-poor LSB galaxies. The diffuse optical disks of Malin 1 and UGC 9024 remain undetected at mid- and far-infrared wavelengths. The dustiest of the three LSB galaxies, UGC 6614, has infrared morphology that varies significantly with wavelength; 160 μm (cool) dust emission is concentrated in two clumps on the northeast and northwest sides of a distinct ring seen in the 24 and 8 μm images (and a broken ring at 70 μm) at a radius of ~40" (18 kpc) from the galaxy center. The 8 and 24 μm emission is cospatial with Hα emission previously observed in the outer ring of UGC 6614. The estimated dust-to-gas ratios, from less than 10^(-3) to 10^(-2), support previous indications that the LSB galaxies are relatively dust-poor compared to the HSB galaxies. The total infrared luminosities are approximately 1/3 to 1/2 the blue-band luminosities, suggesting that old stellar populations are the primary source of dust heating in these LSB objects. The SFR estimated from the infrared data ranges ~0.01-0.88 M_⊙ yr^(-1), consistent with results from optical studies.

Item Type:Article
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Helou, George0000-0003-3367-3415
Mazzarella, Joseph M.0000-0002-8204-8619
Additional Information:© 2007 The American Astronomical Society. Received 2007 January 10; accepted 2007 March 30. The anonymous referee is thanked for constructive comments and suggestions. We happily thank D. Dale for his model fits. We also thank Y. Wu, B. R. Brandl, and J. R. Houck for helpful communications. We acknowledge useful discussions from A. Blain, G. D. Bothun, and S. S. McGaugh on LSB galaxy populations. One of us (N. R.) gratefully acknowledges the support of a Research Associateship administered by Oak Ridge Associated Universities (ORAU) during this research. This research has made use of the NASA/ IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration, and the LEDA database in France. This study is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. This study has made use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and IPAC/ Caltech, funded by NASA and the National Science Foundation. This study also acknowledges the use of data products from the Sloan Digital Sky Survey.
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Oak Ridge Associated Universities (ORAU)UNSPECIFIED
Subject Keywords:galaxies : individual (Malin 1, UGC 6614, UGC 6879; UGC 9024); galaxies : ISM galaxies : spiral; galaxies : structure
Issue or Number:2
Record Number:CaltechAUTHORS:20091116-091302719
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Official Citation:Exploring Infrared Properties of Giant Low Surface Brightness Galaxies Nurur Rahman, Justin H. Howell, George Helou, Joseph M. Mazzarella, and Brent Buckalew 2007 ApJ 663 908-923 doi: 10.1086/518554
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16711
Deposited By: Tony Diaz
Deposited On:25 Nov 2009 21:28
Last Modified:08 Nov 2021 23:29

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