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Constraining millimeter dust emission in nearby galaxies with NIKA2: The case of NGC2146 and NGC2976

Mayet, F., Ejlali, G., Adam, R., Ade, P. ORCID:, Ajeddig, H., André, P., Artis, E., Aussel, H., Baes, M., Beelen, A., Benoît, A., Berta, S., Bing, L., Bourrion, O., Calvo, M., Catalano, A., De Petris, M., Désert, F.-X., Doyle, S. ORCID:, Driessen, E.F.C., Galliano, F., Gomez, A., Goupy, J., Jones, A.P., Hanser, C., Hughes, A., Katsioli, S., Kéruzoré, F., Kramer, C., Ladjelate, B., Lagache, G., Leclercq, S., Lestrade, J.-F., Macías-Pérez, J.F., Madden, S. C., Maury, A., Mauskopf, P. ORCID:, Mayet, F., Monfardini, A., Moyer-Anin, A., Muñoz-Echeverría, M., Nersesian, A., Pantoni, L., Paradis, D., Perotto, L., Pisano, G., Ponthieu, N., Revéret, V., Rigby, A.J., Ritacco, A., Romero, C., Roussel, H., Ruppin, F., Schuster, K., Sievers, A., Smith, M.W.S.L. ORCID:, Tabatabaei, F.S., Tedros, J., Tucker, C. ORCID:, Xilouris, E.M., Zylka, R., Catalano, A., Macías-Pérez, J.F. and Perotto, L. 2024. Constraining millimeter dust emission in nearby galaxies with NIKA2: The case of NGC2146 and NGC2976. EPJ Web of Conferences 293 , 00016. 10.1051/epjconf/202429300016

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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.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Publisher: Società Italiana di Fisica
ISSN: 2100-014X
Date of First Compliant Deposit: 17 May 2024
Date of Acceptance: 28 March 2024
Last Modified: 22 May 2024 10:00

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