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ALMA Observations of Warm Molecular Gas and Cold Dust in NGC 34
- Source :
- The Astrophysical Journal, 787(1). IOP PUBLISHING LTD
- Publication Year :
- 2014
-
Abstract
- We present ALMA Cycle-0 observations of the CO (6-5) line emission (rest-frame frequency = 691.473 GHz) and of the 435$��m$ dust continuum emission in the nuclear region of NGC 34, a local luminous infrared galaxy (LIRG) at a distance of 84 Mpc (1" = 407 pc) which contains a Seyfert 2 active galactic nucleus (AGN) and a nuclear starburst. The CO emission is well resolved by the ALMA beam ($\rm 0."26\times 0."23$), with an integrated flux of $\rm f_{CO~(6-5)} = 1004\; (\pm 151) \; Jy\; km\; s^{-1}$. Both the morphology and kinematics of the CO (6-5) emission are rather regular, consistent with a compact rotating disk with a size of 200 pc. A significant emission feature is detected on the red-shifted wing of the line profile at the frequency of the $\rm H^{13}CN\; (8-7)$ line, with an integrated flux of $\rm 17.7 \pm 2.1 (random) \pm 2.7 (sysmatic)\; Jy\;km\; s^{-1}$. However, it cannot be ruled out that the feature is due to an outflow of warm dense gas with a mean velocity of $\rm 400\; km\; s^{-1}$. The continuum is resolved into an elongated configuration, and the observed flux corresponds to a dust mass of $\rm M_{dust} = 10^{6.97\pm 0.13}\; M_{sun}$. An unresolved central core ($\rm radius \simeq 50\; pc$) contributes $28\%$ of the continuum flux and $19\%$ of the CO (6-5) flux, consistent with insignificant contributions of the AGN to both emissions. Both the CO (6-5) and continuum spatial distributions suggest a very high gas column density ($\rm >= 10^4\; M_{sun}\; pc^{-2}$) in the nuclear region at $\rm radius<br />10 pages, 13 figures, accepted for publication in Astrophysical Journal
- Subjects :
- Luminous infrared galaxy
Physics
submillimeter: galaxies
Active galactic nucleus
galaxies: active
FOS: Physical sciences
Astronomy and Astrophysics
galaxies: starburst
Astrophysics
Continuum flux
Astrophysics - Astrophysics of Galaxies
galaxies: general
galaxies: Seyfert
13. Climate action
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
galaxies: interactions
[PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph]
galaxies: evolution
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal, 787(1). IOP PUBLISHING LTD
- Accession number :
- edsair.doi.dedup.....0ea4571e3f258c1dd454341031095530