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SWAN: NGC 253's Nucleated Star Bursting Environment

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

Mark Gorski ,
Jürgen Ott ,
David Meier ,
Emmanuel Momjian ,
Fabian Walter  and
Richard Rand
Mark Gorski
Affiliation:
Department of Physics, University of University of New Mexico, 1919 Lomas Blvd. NE, Albuquerque, NM 87131, USA emails: [email protected], [email protected] National Radio Astronomy Observatory, P.O. Box O 1003 Lopezville Roadx Socorro, NM 87801-0387, USA emails: [email protected], [email protected]
Jürgen Ott
Affiliation:
National Radio Astronomy Observatory, P.O. Box O 1003 Lopezville Roadx Socorro, NM 87801-0387, USA emails: [email protected], [email protected]
David Meier
Affiliation:
National Radio Astronomy Observatory, P.O. Box O 1003 Lopezville Roadx Socorro, NM 87801-0387, USA emails: [email protected], [email protected] Physics Department, New Mexico Tech, 801 Leroy Place, Socorro, NM 87801, USAemail: [email protected]
Emmanuel Momjian
Affiliation:
National Radio Astronomy Observatory, P.O. Box O 1003 Lopezville Roadx Socorro, NM 87801-0387, USA emails: [email protected], [email protected]
Fabian Walter
Affiliation:
Max Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany email: [email protected]
Richard Rand
Affiliation:
Department of Physics, University of University of New Mexico, 1919 Lomas Blvd. NE, Albuquerque, NM 87131, USA emails: [email protected], [email protected]
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Abstract

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We present the first results from SWAN: “Survey of Water and Ammonia in Nearby galaxies”. Nearby galaxies are conveniently located to probe molecular gas properties on scales of 10 to 200 pc, which are appropriate for the study of Giant Molecular Clouds (GMCs). The resolution of the Very Large Array in D and C configurations corresponds to a few 10s of parsecs in these galaxies. To advance studies of galaxy evolution it is paramount to understand how processes in the molecular Interstellar Medium(ISM) and star formation are linked on these scales. We have observed the metastable transitions of ammonia and the 22GHz water maser line in four nearby galaxies: NGC 253, IC 342, NGC 2146, and NGC 6946 using the VLA. These galaxies were chosen to span an order of magnitude in star formation rate, and a range of galactic ecosystems. We use the ammonia transitions to derive kinetic temperatures, which exposes the heating and cooling balance of the ISM. We then aim to relate these conditions to energetic feedback from star formation as indicated by water masers.

Currently, our analysis is focused on NGC 253. NGC 253 is a barred spiral starburst galaxy with a nucleated star formation rate (SFR) of ≈ 3M⊙ per year. We use a distance of 3.9Mpc for analysis. We have observed ammonia transitions (1,1) to (5,5) and the 22GHz water maser line with a resolution of ≈63pc. We have identified nine regions across the nucleated starburst for study. The ammonia (3,3) line appears to be masing in the centermost 200pc. We have identified two regions of water maser emission. The first region is a minor axis extension, about the center of the galaxy, and is very close to the outflow. By means of these measurements, we gain an understanding of the molecular ISM associated with the nucleated starburst environment in NGC 253.

Keywords

galaxies: individual (NGC 253)ISMstarburstmasersmolecular data
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S315: From Interstellar Clouds to Star-Forming Galaxies: Universal Processes? , August 2015 , E29
Copyright
Copyright © International Astronomical Union 2016 

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