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Which attenuation curves for star-forming galaxies?

Published online by Cambridge University Press:  10 June 2020

Véronique Buat ,
David Corre ,
Médéric Boquien  and
Katarzyna Małek
Véronique Buat
Affiliation:
Aix Marseille Univ, CNRS, CNES, LAM Marseille, France email: [email protected]
David Corre
Affiliation:
Aix Marseille Univ, CNRS, CNES, LAM Marseille, France email: [email protected]
Médéric Boquien
Affiliation:
Centro de Astronomía (CITEVA), Universidad de Antofagasta, Avenida Angamos 601, Antofagasta, Chile
Katarzyna Małek
Affiliation:
Aix Marseille Univ, CNRS, CNES, LAM Marseille, France email: [email protected] National Centre for Nuclear Research, ul. Hoza 69, 00-681 Warszawa, Poland
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Abstract

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Dust attenuation shapes the spectral energy distributions of galaxies and any modelling and fitting procedure of their spectral energy distributions must account for this process. We present results of two recent works dedicated at measuring the dust attenuation curves in star forming galaxies at redshift from 0.5 to 3, by fitting continuum (photometric) and line (spectroscopic) measurements simultaneously with CIGALE using variable attenuation laws based on flexible recipes. Both studies conclude to a large variety of effective attenuation laws with an attenuation law flattening when the obscuration increases. An extra attenuation is found for nebular lines. The comparison with radiative transfer models implies a flattening of the attenuation law up to near infrared wavelengths, which is well reproduced with a power-laws recipe inspired by the Charlot and Fall recipe. Here we propose a global modification of the Calzetti attenuation law to better reproduce the results of radiative transfer models.

Keywords

galaxies: high-redshift–dust : extinction –galaxies: ISM–infrared: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S341: Challenges in Panchromatic Modelling with Next Generation Facilities , November 2019 , pp. 70 - 73
Copyright
© International Astronomical Union 2020

References

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