IAS/CEA Evolution of Dust in Nearby Galaxies (ICED): The spatially-resolved dust properties of NGC4254

¹ Sterrenkundig Observatorium Universiteit Gent, Krijgslaan 281 S9, B-9000 Gent, Belgium
² Université Paris-Saclay, Université Paris Cité, CEA, CNRS, AIM, 91191, Gif-sur-Yvette, France
³ Institut d’Astrophysique Spatiale (IAS), CNRS, Université Paris Sud, Orsay, France
⁴ Institute for Research in Fundamental Sciences (IPM), School of Astronomy, Tehran, Iran
⁵ Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France
⁶ School of Physics and Astronomy, Cardiff University, CF24 3AA, UK
⁷ Université Grenoble Alpes, CNRS, Grenoble INP, LPSC-IN2P3, 38000 Grenoble, France
⁸ Max Planck Institute for Extraterrestrial Physics, 85748 Garching, Germany
⁹ Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France
¹⁰ Université Grenoble Alpes, CNRS, Institut Néel, France
¹¹ Institut de RadioAstronomie Millimétrique (IRAM), Grenoble, France
¹² Dipartimento di Fisica, Sapienza Università di Roma, I-00185 Roma, Italy
¹³ Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
¹⁴ Centro de Astrobiología (CSIC-INTA), Torrejón de Ardoz, 28850 Madrid, Spain
¹⁵ Institute for Research in Fundamental Sciences (IPM), School of Astronomy, Tehran, Iran
¹⁶ National Observatory of Athens, IAASARS, GR-15236, Athens, Greece
¹⁷ Faculty of Physics, University of Athens, GR-15784 Zografos, Athens, Greece
¹⁸ High Energy Physics Division, Argonne National Laboratory, Lemont, IL 60439, USA
¹⁹ Instituto de Radioastronomía Milimétrica (IRAM), Granada, Spain
²⁰ LERMA, Observatoire de Paris, PSL Research Univ., CNRS, Sorbonne Univ., UPMC, 75014 Paris, France
²¹ School of Earth & Space and Department of Physics, Arizona State University, AZ 85287, USA
²² School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK
²³ INAF-Osservatorio Astronomico di Cagliari, 09047 Selargius, Italy
²⁴ LPENS, ENS, PSL Research Univ., CNRS, Sorbonne Univ., Université de Paris, 75005 Paris, France
²⁵ Department of Physics and Astronomy, University of Pennsylvania, PA 19104, USA
²⁶ Institut d’Astrophysique de Paris, CNRS (UMR7095), 75014 Paris, France
²⁷ University of Lyon, UCB Lyon 1, CNRS/IN2P3, IP2I, 69622 Villeurbanne, France
²⁸ IRAP, Université de Toulouse, CNRS, UPS, IRAP, Toulouse Cedex 4, France

^* e-mail: lara.pantoni@ugent.be

Published online: 28 March 2024

Abstract

We present the first preliminary results of the project ICED, focusing on the face-on galaxy NGC4254. We use the millimetre maps observed with NIKA2 at lRAM-30m. as part of the IMEGIN Guaranteed Time Large Program. and of a wide collection of ancillary data (multi-wavelength photometry and gas phase spectral lines) that are publicly available. We derive the global and local properties of interstellar dust grains through infrared-to-radio spectral energy distribution fitting, using the hierarchical Bayesian code HerBIE. which includes the grain properties of the state-of-the-art dust model. THEMIS. Our method allows us to get the following dust parameters: dust mass, average interstellar radiation field, and fraction of small grains. Also, it is effective in retrieving the intrinsic correlations between dust parameters and interstellar medium properties. We find an evident anti-correlation between the interstellar radiation field and the fraction of small grains in the centre of NGC4254. meaning that, at strong radiation field intensities, very small amorphous carbon grains are efficiently destroyed by the ultra-violet photons coming from newly formed stars, through photo-desorption and sublimation. We observe a flattening of the anti-correlation at larger radial distances, which may be driven by the steep metallicity gradient measured in NGC4254.