Star-dust geometry main determinant of dust attenuation in galaxies

Abstract

Analysing a large representative sample of local galaxies (8707), we find that the variation in the shape of their dust attenuation curves is driven primarily by their structure, i.e., distribution of stars (and dust) within them. The attenuation curve for spheroid dominated galaxies, as compared to the disc dominated ones, is nearly twice as steep. Both structural types cover distinct ranges of attenuation slope values. Similar findings are reflected in the case of star-forming and passive galaxies. Spheroids and passive galaxies witness minimal attenuation in the optical compared to UV wavelengths underlining the lack of dusty birth-clouds that define complex star-dust geometry. The distinction in the attenuation properties of spheroids and discs is maintained in each stellar mass range emphasising that structure is the primal cause of variation. However, within a structural group, the attenuation curve becomes shallower with both the increase in total stellar mass and optical depth of the galaxy. Overall, with the extinction curve fixed to be the same for all galaxies, the star-dust geometry emerges to be the prime determinant of the variation in their attenuation properties.

Accepted for publication in MNRAS Letters, 5 pages, 3 figures

References in corpus (11)

• Cosmic Star Formation History
• Structural Properties of Pseudo-Bulges, Classical Bulges and Elliptical Galaxies: an SDSS Perspective
• The Kormendy relation of massive elliptical galaxies at z~1.5. Evidence for size evolution ?
• The Sloan Digital Sky Survey Stripe 82 Imaging Data: Depth-Optimized Co-adds Over 300 Deg^2 in Five Filters
• Far-infrared surveys of galaxy evolution
• Inclination-Dependent Extinction Effects in Disk Galaxies in the Sloan Digital Sky Survey
• Bulge plus disc and Sérsic decomposition catalogues for 16,908 galaxies in the SDSS Stripe 82 co-adds: A detailed study of the $ugriz$ structural measurements
• VICS82: the VISTA-CFHT Stripe 82 near-infrared survey
• The evolution of disc galaxies with and without classical bulges since z~1
• Correlation of structure and stellar properties of galaxies in Stripe 82
• Formation of disc galaxies around z~2

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• SE3D: Building a radiative transfer emulator to fit panchromatic resolved galaxy observations with 3D models of dust and stars