Issue |
A&A
Volume 641, September 2020
|
|
---|---|---|
Article Number | A119 | |
Number of page(s) | 9 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361/202038470 | |
Published online | 18 September 2020 |
Nonparametric galaxy morphology from UV to submm wavelengths
1
Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281 S9, 9000 Gent, Belgium
e-mail: maarten.baes@ugent.be
2
National Observatory of Athens, Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, Ioannou Metaxa and Vasileos Pavlou, 15236 Athens, Greece
3
INAF – Istituto di Radioastronomia, Via P. Gobetti 101, 40129 Bologna, Italy
4
INAF – Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
5
INAF – Istituto di Astrofisica Spaziale e Fisica cosmica, Via A. Corti 12, 20133 Milano, Italy
6
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
7
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
8
Instituto de Radioastronomía y Astrofísica, UNAM, Antigua Carretera a Pátzcuaro # 8701, Ex-Hda. San José de la Huerta, 58089 Morelia, Michoacán, Mexico
9
AIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, 91191 Gif-sur-Yvette, France
10
Central Astronomical Observatory of RAS, Pulkovskoye Chaussee 65/1, 196140 St. Petersburg, Russia
11
St. Petersburg State University, Universitetskij Pr. 28, 198504 St. Petersburg, Stary Peterhof, Russia
12
Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
Received:
22
May
2020
Accepted:
3
July
2020
We present the first nonparametric morphological analysis of a set of spiral galaxies from UV to submillimeter (submm) wavelengths. Our study is based on high-quality multi-wavelength imaging for nine well-resolved spiral galaxies from the DustPedia database, combined with nonparametric morphology indicators calculated in a consistent way using the StatMorph package. We measure the half-light radius, the concentration index, the asymmetry index, the smoothness index, the Gini coefficient, and the M20 indicator in various wavebands from UV to submm wavelengths, and in stellar mass, dust mass, and star formation rate maps. We find that the interstellar dust in galaxies is distributed in a more extended, less centrally concentrated, more asymmetric, and more clumpy way than the stars are. This is particularly evident when comparing morphological indicators based on the stellar mass and dust mass maps. This should serve as a warning sign against treating the dust in galaxies as a simple smooth component. We argue that the nonparametric galaxy morphology of galaxies from UV to submm wavelengths is an interesting test for cosmological hydrodynamics simulations.
Key words: galaxies: structure / galaxies: spiral
© ESO 2020
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