Issue |
EPJ Web Conf.
Volume 293, 2024
mm Universe 2023 - Observing the Universe at mm Wavelengths
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Article Number | 00016 | |
Number of page(s) | 6 | |
DOI | https://doi.org/10.1051/epjconf/202429300016 | |
Published online | 28 March 2024 |
https://doi.org/10.1051/epjconf/202429300016
Constraining millimeter dust emission in nearby galaxies with NIKA2: The case of NGC2146 and NGC2976
1 Institute for Research in Fundamental Sciences (IPM), School of Astronomy, Tehran, Iran
2 Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France
3 School of Physics and Astronomy, Cardiff University, CF24 3AA, UK
4 Université Paris-Saclay, Université Paris Cité, CEA, CNRS, AIM, 91191, Gif-sur-Yvette, France
5 Université Grenoble Alpes, CNRS, Grenoble INP, LPSC-IN2P3, 38000 Grenoble, France
6 Max Planck Institute for Extraterrestrial Physics, 85748 Garching, Germany
7 Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France
8 Université Grenoble Alpes, CNRS, Institut Néel, France
9 Institut de RadioAstronomie Millimétrique (IRAM), Grenoble, France
10 Dipartimento di Fisica, Sapienza Università di Roma, 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 National Observatory of Athens, IAASARS, GR-15236, Athens, Greece
14 Faculty of Physics, University of Athens, GR-15784 Zografos, Athens, Greece
15 High Energy Physics Division, Argonne National Laboratory, Lemont, IL 60439, USA
16 Instituto de Radioastronomía Milimétrica (IRAM), Granada, Spain
17 LERMA, Observatoire de Paris, PSL Research Univ., CNRS, Sorbonne Univ., UPMC, 75014 Paris, France
18 School of Earth & Space and Department of Physics, Arizona State University, AZ 85287, USA
19 School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK
20 INAF-Osservatorio Astronomico di Cagliari, 09047 Selargius, Italy
21 LPENS, ENS, PSL Research Univ., CNRS, Sorbonne Univ., Université de Paris, 75005 Paris, France
22 Department of Physics and Astronomy, University of Pennsylvania, PA 19104, USA
23 Institut d’Astrophysique de Paris, CNRS (UMR7095), 75014 Paris, France
24 University of Lyon, UCB Lyon 1, CNRS/IN2P3, IP2I, 69622 Villeurbanne, France
25 Sterrenkundig Observatorium Universiteit Gent, Krijgslaan 281 S9, B-9000 Gent, Belgium
26 Institut d’Astrophysique Spatiale (IAS), CNRS, Université Paris Sud, Orsay, France
27 IRAP, Université de Toulouse, CNRS, UPS, IRAP, Toulouse Cedex 4, France
* e-mail: gejlali@ipm.ir
Published online: 28 March 2024
This study presents the first millimeter continuum mapping observations of two nearby galaxies, the starburst spiral galaxy NGC2146 and the dwarf galaxy NGC2976, at 1.15 mm and 2 mm using the NIKA2 camera on the IRAM 30m telescope, as part of the Guaranteed Time Large Project IMEGIN. These observations provide robust resolved information about the physical properties of dust in nearby galaxies by constraining their FIR-radio SED in the millimeter domain. After subtracting the contribution from the CO line emission, the SEDs are modeled spatially using a Bayesian approach. Maps of dust mass surface density, temperature, emissivity index, and thermal radio component of the galaxies are presented, allowing for a study of the relations between the dust properties and star formation activity (using observations at 24μm as a tracer). We report that dust temperature is correlated with star formation rate in both galaxies. The effect of star formation activity on dust temperature is stronger in NGC2976, an indication of the thinner interstellar medium of dwarf galaxies. Moreover, an anti-correlation trend is reported between the dust emissivity index and temperature in both galaxies.
© The Authors, published by EDP Sciences, 2024
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