期刊
ASTROPHYSICAL JOURNAL
卷 779, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/779/2/173
关键词
galaxies: active; galaxies: individual (NGC 1266); galaxies: nuclei; radio continuum: galaxies
资金
- NASA [NAS5-26555]
- Gordon and Betty Moore Foundation
- Kenneth T. and Eileen L. Norris Foundation
- James S. McDonnell Foundation
- Associates of the California Institute of Technology
- University of Chicago
- state of California
- state of Maryland
- National Science Foundation
- CARMA partner universities
- NSF [1109803]
- state of Illinois
- STFC [ST/K00106X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K00106X/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1109803, 1140019, 1140063, 1139950, 1140031] Funding Source: National Science Foundation
We present new high spatial resolution Karl G. Jansky Very Large Array (VLA) Hi absorption and Very Long Baseline Array (VLBA) continuum observations of the active-galactic-nucleus-(AGN-)driven molecular outflow candidate NGC 1266. Although other well-known systems with molecular outflows may be driven by star formation (SF) in a central molecular disk, the molecular mass outflow rate of 13 M-circle dot yr(-1) in NGC 1266 reported by Alatalo et al. exceeds SF rate estimates from a variety of tracers. This suggests that an additional energy source, such as an AGN, may play a significant role in powering the outflow. Our high spatial resolution Hi absorption data reveal compact absorption against the radio continuum core co-located with the putative AGN, and the presence of a blueshifted spectral component re-affirms that gas is indeed flowing out of the system. Our VLBA observations at 1.65 GHz reveal one continuum source within the densest portion of the molecular gas, with a diameter d < 8 mas (1.2 pc), a radio power P-rad = 1.48 x 10(20) W Hz(-1), and a brightness temperature T-b > 1.5 x 10(7) K that is most consistent with an AGN origin. The radio continuum energetics implied by the compact VLBA source, as well as archival VLA continuum observations at lower spatial resolution, further support the possibility that the AGN in NGC 1266 could be driving the molecular outflow. These findings suggest that even low-level AGNs may be able to launch massive outflows in their host galaxies.
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