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ALMA Explorations of Warm Dense Molecular Gas in Nearby LIRGs

Xu, C. Kevin (2014) ALMA Explorations of Warm Dense Molecular Gas in Nearby LIRGs. Proceedings of the International Astronomical Union, 10 . pp. 61-64. ISSN 1743-9213. http://resolver.caltech.edu/CaltechAUTHORS:20150218-101447334

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Abstract

We present results of ALMA (Cycle-0) observations of the CO (6-5) line emission and the 435μm continuum of two nearby luminous infrared galaxies (LIRGs) NGC 34 (a major merger with an AGN) and NGC 1614 (a minor merger with a circum-nuclear starburst). Using receivers in the highest frequency ALMA band available (Band-9), these observations achieved the best angular resolutions (∼0″.25) for ALMA Cycle-0 observations and resolved for the first time distributions of warm dense molecular gas (n > 10^5 cm^(−3), T > 100 K) in LIRGs with spatial resolutions better than 100 pc. Our ALMA data show a very tight correlation between the CO (6-5) line emission and the 435μm dust continuum emission, suggesting the warm dense molecular gas dominates the ISM in the central kpc of LIRGs, and gas heating and dust heating in the warm dense gas cores are strongly coupled. On the other hand, we saw very different spatial distributions and kinematic properties of warm dense gas in the two LIRGs, indicating that physical conditions in the ISM can be very different in different LIRGs.


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http://dx.doi.org/10.1017/S1743921314009314DOIArticle
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=9551307&fileId=S1743921314009314PublisherArticle
https://galaxy3d.univie.ac.at/OrganizationConference Website
Additional Information:© 2015 International Astronomical Union. Proceedings IAU Symposium No. 309. Published online: 09 February 2015. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2011.0.00182.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ.
Subject Keywords:galaxies: interactions - galaxies: evolution - galaxies: starburst - galaxies: general - galaxies: active - submillimeter: galaxies
Record Number:CaltechAUTHORS:20150218-101447334
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150218-101447334
Official Citation:C. Kevin Xu (2014). ALMA Explorations of Warm Dense Molecular Gas in Nearby LIRGs. Proceedings of the International Astronomical Union, 10, pp 61-64. doi:10.1017/S1743921314009314
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54939
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Feb 2015 05:13
Last Modified:31 Oct 2017 22:11

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