Global Attenuation in Spiral Galaxies in Optical and Infrared Bands
Abstract
The emerging light from a galaxy is under the influence of its own interstellar medium, as well as its spatial orientation. Considering a sample of 2239 local spiral galaxies in optical (Sloan Digital Sky Survey u, g, r, i, and z) and infrared bands (WISE W1, W1), we study the dependency of the global intrinsic attenuation in spiral galaxies on their morphologies, sizes, and spatial inclinations. Reddening is minimal at the extremes of low mass and gas depletion and maximal in galaxies that are relatively massive and metal-rich and still retain substantial gas reserves. A principal component constructed from observables that monitor galaxy mass, relative H i content to old stars, and infrared surface brightness is strongly correlated with the amplitude of obscuration. We determine both a parametric model for dust obscuration and a nonparametric model based on the Gaussian process formalism. An average dust attenuation curve is derived for wavelengths between 0.36 and 4.5 μm.
Additional Information
© 2019 The American Astronomical Society. Received 2019 April 23; revised 2019 August 30; accepted 2019 September 3; published 2019 October 14. We are pleased to acknowledge the citizen participation to scientific research of undergraduate students at University of Hawaii, members of amateur astronomy clubs in France Planétarium de Vaulx-en-Velin, Association Clair d'étoiles et Brin d'jardin, Société astronomique de Lyon, Club d'astronomie Lyon Ampère, Club d'astronomie des monts du lyonnais, Club d'astronomie de Dijon, and friends who helped us with measuring inclinations of spiral galaxies in our sample. Support for E.K. and R.B.T. was provided by NASA through grant No. 88NSSC18K0424 from the Space Telescope Science Institute. H.C. acknowledges support from Institut Universitaire de France. This research has made use of the NASA/IPAC Extragalactic Database, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research made use of Montage, funded by the National Aeronautics and Space Administrations Earth Science Technology Office, Computational Technologies Project, under Cooperative Agreement No. NCC5-626 between NASA and the California Institute of Technology. The code is maintained by the NASA/IPAC Infrared Science Archive.Attached Files
Published - Kourkchi_2019_ApJ_884_82.pdf
Accepted Version - 1909.01572.pdf
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Additional details
- Eprint ID
- 99257
- Resolver ID
- CaltechAUTHORS:20191014-140001387
- 88NSSC18K0424
- NASA
- Institut Universitaire de France (IUF)
- NASA/JPL/Caltech
- NCC5-626
- NASA
- Created
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2019-10-14Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field