Astrophys. J., 787, 48 (2014/May-3)
ALMA observations of warm molecular gas and cold dust in NGC 34.
XU C.K., CAO C., LU N., GAO Y., VAN DER WERF P., EVANS A.S., MAZZARELLA J.M., CHU J., HAAN S., DIAZ-SANTOS T., MEIJERINK R., ZHAO Y.-H., APPLETON P., ARMUS L., CHARMANDARIS V., LORD S., MURPHY E.J., SANDERS D.B., SCHULZ B. and STIERWALT S.
Abstract (from CDS):
We present Atacama Large Millimeter Array (ALMA) Cycle-0 observations of the CO (6-5) line emission (rest-frame frequency = 691.473 GHz) and of the 435 µm dust continuum emission in the nuclear region of NGC 34, a local luminous infrared galaxy 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 (0.''26x0.''23), with an integrated flux of fCO(6–5)= 1004 (± 151) Jy km/s. 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 redshifted wing of the line profile at the frequency of the H13CN (8-7) line, with an integrated flux of 17.7±2.1(random)±2.7(systematic) Jy km/s. However, it cannot be ruled out that the feature is due to an outflow of warm dense gas with a mean velocity of 400 km/s. The continuum is resolved into an elongated configuration, and the observed flux corresponds to a dust mass of Mdust= 106.97±0.13 M☉. An unresolved central core (radius ≃ 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 ( ≳ 104 M☉/pc2) in the nuclear region at radius ≲ 100 pc.
galaxies: active - galaxies: evolution - galaxies: general - galaxies: interactions - galaxies: starburst - galaxies: Seyfert - submillimeter: galaxies
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