Constraining Millimeter Dust Emission in Nearby Galaxies with NIKA2: the case of NGC2146 and NGC2976
2 LAGRANGE - Joseph Louis LAGRANGE
3 Cardiff University
4 AIM (UMR_7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
5 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
6 Sterrenkundig Observatorium, Universiteit Gent
7 LAM - Laboratoire d'Astrophysique de Marseille
8 NEEL - HELFA - Hélium : du fondamental aux applications
9 IRAM - Institut de RadioAstronomie Millimétrique
10 NEEL - Cryo - Cryogénie
11 UNIROMA - Università degli Studi di Roma "La Sapienza" = Sapienza University [Rome]
12 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble
13 CAB - Centro de Astrobiologia [Madrid]
14 IAS - Institut d'astrophysique spatiale
15 IRAP - Institut de recherche en astrophysique et planétologie
16 NOA - National Observatory of Athens
17 ANL - Argonne National Laboratory [Lemont]
18 IRAM - Instituto de RadioAstronomía Milimétrica
19 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres
20 University of Leeds
21 Astrophysique
22 University of Pennsylvania [Philadelphia]
23 IAP - Institut d'Astrophysique de Paris
24 IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
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Abstract
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 24$\mu$m 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.