2007A&A...473..747L


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.16CEST17:10:52

2007A&A...473..747L - Astronomy and Astrophysics, volume 473, 747-759 (2007/10-3)

Nuclear starburst-driven evolution of the central region in NGC 6764.

LEON S., ECKART A., LAINE S., KOTILAINEN J.K., SCHINNERER E., LEE S.-W., KRIPS M., REUNANEN J. and SCHARWAECHTER J.

Abstract (from CDS):

We study the CO and the radio continuum emission in an active galaxy to analyze the interplay between the central activity and the molecular gas. We present new high-resolution observations of the 12CO(1-0) and 12CO(2-1) emission lines, and 3.5cm and 20cm radio continuum emission in the central region of the LINER/starburst galaxy NGC 6764. The galaxy has an outflow morphology in radio continuum, spatially coincident with the CO and Hα emission, and centered slightly off the radio continuum peak at the LINER nucleus. The total molecular gas mass in the center is about 7x108M, using a CO luminosity to total molecular gas conversion factor that is three times lower than the standard one. 12CO(1-0) emission is found near the boundaries of the radio continuum emission cone. The outflow has a projected expansion velocity of 25km/s relative to the systemic velocity of NGC 6764. About 4x106M of molecular gas is detected in the outflow. The approximate location (∼1 kpc) of the dynamical inner Lindblad resonance has been derived from the rotation curve. The peak of the CO emission is slightly (<200pc) offset from the peak of the radio continuum. The molecular gas has most likely been ejected by the stellar winds from the recent starburst, but the CO line ratios show indication of an interaction with the AGN. The energy released by the nuclear starburst is sufficient to explain the observed outflow, even if the data cannot exclude the AGN from being the major energy source. Comparison of the outflow with hydrodynamical simulations suggests that the nuclear starburst is 3-7Myr old and the bubble-like outflow is still confined and not freely expanding.

Abstract Copyright:

Journal keyword(s): ISM: jets and outflows - galaxies: active - ISM: kinematics and dynamics - ISM: individual objects: NGC 6764 - radio lines: galaxies

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2846 2
2 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 3966 2
3 NGC 2782 Sy2 09 14 05.120 +40 06 49.68 12.29 12.30 11.63     ~ 426 3
4 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5195 6
5 NGC 3079 Sy2 10 01 57.80342 +55 40 47.2428 11.57 11.54 10.86     ~ 1211 3
6 NGC 3256 IG 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 729 2
7 NGC 5775 GiP 14 53 57.653 +03 32 40.10   13.0 11.34     ~ 379 2
8 ICRF J182931.7+484446 Sy1 18 29 31.7812801678 +48 44 46.158815781   17.05 16.81 16.860   ~ 619 1
9 NGC 6764 LIN 19 08 16.348 +50 55 59.14   15.00 14.32     ~ 266 1

    Equat.    Gal    SGal    Ecl

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2019.09.16-17:10:52

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