https://doi.org/10.1051/epjconf/202225700016
Dust Emission in Galaxies at Millimeter Wavelengths: Cooling of star forming regions in NGC6946
1 School of Astronomy, Institute for Research in Fundamental Sciences (IPM), Larak Garden, 19395-5531 Tehran, Iran
2 LLR (Laboratoire Leprince-Ringuet), CNRS, École Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
3 School of Physics and Astronomy, Cardiff University, Queen’s Buildings, The Parade, Cardiff, CF24 3AA, UK
4 AIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, 91191 Gifsur-Yvette, France
5 Univ. Grenoble Alpes, CNRS, Grenoble INP, LPSC-IN2P3, 38000 Grenoble, France
6 Institut d’Astrophysique Spatiale (IAS), CNRS, Université Paris Sud, Orsay, France
7 Institut Néel, CNRS, Université Grenoble Alpes, France
8 Institut de RadioAstronomie Millimétrique (IRAM), Grenoble, France
9 Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France
10 Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro 5, I-00185 Roma, Italy
11 Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
12 Centro de Astrobiología (CSIC-INTA), Torrejón de Ardoz, 28850 Madrid, Spain
13 Université de Toulouse, UPS-OMP, F-31028 Toulouse, France; CNRS, IRAP, Av. du Colonel Roche BP 44346, F-31028 Toulouse cedex 4, France
14 Instituto de Radioastronomía Milimétrica (IRAM), Granada, Spain
15 National Observatory of Athens, Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, Ioannou Metaxa and Vasileos Pavlou GR-15236, Athens, Greece
16 Department of Astrophysics, Astronomy & Mechanics, Faculty of Physics, University of Athens, Panepistimiopolis, GR-15784 Zografos, Athens, Greece
17 Sterrenkundig Observatorium Universiteit Gent, Krijgslaan 281 S9, B-9000 Gent, Belgium
18 Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, UK
19 LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Université, UPMC, 75014 Paris, France
20 School of Earth and Space Exploration and Department of Physics, Arizona State University, Tempe, AZ 85287, USA
21 Laboratoire de Physique de l’École Normale Supérieure, ENS, PSL Research University, CNRS, Sorbonne Université, Université de Paris, 75005 Paris, France
22 Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA, 19104, USA
23 Institut d’Astrophysique de Paris, Sorbonne Université, CNRS (UMR7095), 75014 Paris, France
24 Instituto de Astrofísica de Canarias, Vía L’actea S/N, 38205 La Laguna, Spain
25 Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
26 Caltech, Pasadena, CA 91125, USA
* e-mail: gejlali@ipm.ir
Published online: 17 January 2022
Interstellar dust plays an important role in the formation of molecular gas and the heating and cooling of the interstellar medium. The spatial distribution of the mm-wavelength dust emission from galaxies is largely unexplored. The NIKA2 Guaranteed Time Project IMEGIN (Interpreting the Millimeter Emission of Galaxies with IRAM and NIKA2) has recently mapped the mm emission in the grand design spiral galaxy NGC6946. By subtracting the contributions from the free-free, synchrotron, and CO line emission, we map the distribution of the pure dust emission at 1:15mm and 2mm. Separating the arm/interarm regions, we find a dominant 2mm emission from interarms indicating the significant role of the general interstellar radiation field in heating the cold dust. Finally, we present maps of the dust mass, temperature, and emissivity index using the Bayesian MCMC modeling of the spectral energy distribution in NGC6946.
© The Authors, published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
