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Characterizing Dust Attenuation in Local Star-forming Galaxies: Inclination Effects and the 2175 Å Feature

Battisti, A. J. and Calzetti, D. and Chary, R.-R. (2017) Characterizing Dust Attenuation in Local Star-forming Galaxies: Inclination Effects and the 2175 Å Feature. Astrophysical Journal, 851 (2). Art. No. 90. ISSN 1538-4357. https://resolver.caltech.edu/CaltechAUTHORS:20171215-095223510

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Abstract

We characterize the influence that inclination has on the shape and normalization in average dust attenuation curves derived from a sample of ~10,000 local star-forming galaxies. To do this, we utilize aperture-matched multiwavelength data from the Galaxy Evolution Explorer, the Sloan Digital Sky Survey, the United Kingdom Infrared Telescope, and the Two Micron All-sky Survey. We separate our sample into groups according to axial ratio (b/a) and obtain an estimate of their average total-to-selective attenuation k(λ). The attenuation curves are found to be shallower at UV wavelengths with increasing inclination, whereas the shape at longer wavelengths remains unchanged. The highest inclination subpopulation b/a < 0.42 exhibits an NUV excess in its average selective attenuation, which, if interpreted as a 2175 Å feature, is best fit with a bump strength of 17%–26% of the MW value. No excess is apparent in the average attenuation curve of lower inclination galaxies. The differential reddening between the stellar continuum and ionized gas is found to decrease with increasing inclination. We find that higher inclination galaxies have slightly higher values of R_V , although this is poorly constrained given the uncertainties. We outline possible explanations for these trends within a two component dust model (dense cloud+diffuse dust) and find that they can be naturally explained if carriers of the 2175 Å feature are preferentially destroyed in star-forming regions (UV-bright regions).


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/aa9a43DOIArticle
http://iopscience.iop.org/article/10.3847/1538-4357/aa9a43PublisherArticle
ORCID:
AuthorORCID
Battisti, A. J.0000-0003-4569-2285
Calzetti, D.0000-0002-5189-8004
Chary, R.-R.0000-0001-7583-0621
Additional Information:© 2017. The American Astronomical Society. Received 2017 August 25; revised 2017 October 27; accepted 2017 November 11; published 2017 December 15. The authors thank the anonymous referee, whose suggestions helped clarify and improve the content of this work. A.J.B. also thanks K. Grasha for comments that improved the clarity of this paper and T.M. Tripp for suggestions that led to the analysis of GALEX spectroscopic sources. Part of this work has been supported by the National Aeronautics and Space Administration (NASA), via the Jet Propulsion Laboratory Euclid Project Office, as part of the "Science Investigations as Members of the Euclid Consortium and Euclid Science Team" program. This work is based on observations made with the NASA Galaxy Evolution Explorer. GALEX is operated for NASA by the California Institute of Technology under NASA contract NAS5-98034. This work has made use of SDSS data. Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the US Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society, and the Higher Education Funding Council for England. The SDSS website is http://www.sdss.org/. The SDSS is managed by the Astrophysical Research Consortium for the Participating Institutions. This work has made use of data obtained with the United Kingdom Infrared Telescope. UKIRT is supported by NASA and operated under an agreement among the University of Hawaii, the University of Arizona, and Lockheed Martin Advanced Technology Center; operations are enabled through the cooperation of the East Asian Observatory. When the data reported here were acquired, UKIRT was operated by the Joint Astronomy Centre on behalf of the Science and Technology Facilities Council of the United Kingdom. This publication makes use of data products from the Two Micron All-sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the NASA and the National Science Foundation.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
NASANAS5-98034
Subject Keywords:dust, extinction; galaxies: evolution; galaxies: general; galaxies: ISM
Issue or Number:2
Record Number:CaltechAUTHORS:20171215-095223510
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20171215-095223510
Official Citation:A. J. Battisti et al 2017 ApJ 851 90
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83939
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:15 Dec 2017 21:43
Last Modified:03 Oct 2019 19:12

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