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Cited by 386

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THE DUST ATTENUATION LAW IN DISTANT GALAXIES: EVIDENCE FOR VARIATION WITH SPECTRAL TYPE

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Kriek, Mariska, Conroy, Charlie·2013·The Astrophysical Journal

Abstract

This Letter utilizes composite spectral energy distributions (SEDs) constructed from NEWFIRM Medium-Band Survey photometry to constrain the dust attenuation curve in 0.5 < z < 2.0 galaxies. Based on similarities between the full SED shapes (0.3–8 μm), we have divided galaxies in 32 different spectral classes and stacked their photometry. As each class contains galaxies over a range in redshift, the resulting rest-frame SEDs are well sampled in wavelength and show various spectral features including Hα and the UV dust bump at 2175 Å. We fit all composite SEDs with flexible stellar population synthesis models, while exploring attenuation curves with varying slopes and UV bump strengths. The Milky Way and Calzetti law provide poor fits at UV wavelengths for nearly all SEDs. Consistent with previous studies, we find that the best-fit attenuation law varies with spectral type. There is a strong correlation between the best-fit dust slope and UV bump strength, with steeper laws having stronger bumps. Moreover, the attenuation curve correlates with specific star formation rate (SFR), with more active galaxies having shallower dust curves and weaker bumps. There is also a weak correlation with inclination. The observed trends can be explained by differences in the dust-to-star geometry, a varying grain size distribution, or a combination of both. Our results have several implications for galaxy evolution studies. First, the assumption of a universal dust model leads to biases in derived galaxy properties. Second, the presence of a dust bump may result in underestimated values for the UV slope, used to correct SFRs of distant galaxies.

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Metadata

Authors
Kriek, M., & Conroy, C.
Venue
The Astrophysical Journal
Published
2013-09-05
Volume
775
Issue
1
Pages
L16
ISSN
  • 2041-8205 (ISSN-L)
  • 2041-8213
OpenAlex
W1982945295
Cited by
386
References
38
FWCI
8.02
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: THE DUST ATTENUATION LAW IN DISTANT GALAXIES: EVIDENCE FOR VARIATION WITH SPECTRAL TYPE. https://app.cochat.ai/papers/10.1088/2041-8205/775/1/l16
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Kriek, M., & Conroy, C. (2013). THE DUST ATTENUATION LAW IN DISTANT GALAXIES: EVIDENCE FOR VARIATION WITH SPECTRAL TYPE. The Astrophysical Journal. https://doi.org/10.1088/2041-8205/775/1/l16

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