期刊
ASTROPHYSICAL JOURNAL
卷 911, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/abe70c
关键词
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资金
- National Science Foundation [AST 1817233]
- NASA through Space Telescope Science Institute [HST GO-15662.001A, GO-15915.001A]
- NASA [NAS 5-26555]
- Keck Visiting Scholars Program
- W. M. Keck Foundation
- Alfred P. Sloan Foundation
- U.S. Department of Energy
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- American Museum of Natural History
- Astrophysical Institute Potsdam
- University of Basel
- University of Cambridge
- Case Western Reserve University
- University of Chicago
- Drexel University
- Fermilab
- Institute for Advanced Study
- Japan Participation Group
- Johns Hopkins University
- Joint Institute for Nuclear Astrophysics
- Kavli Institute for Particle Astrophysics and Cosmology
- Korean Scientist Group
- Chinese Academy of Sciences (LAMOST)
- Los Alamos National Laboratory
- Max Planck Institute for Astronomy (MPIA)
- Max Planck Institute for Astrophysics (MPA)
- New Mexico State University
- Ohio State University
- University of Pittsburgh
- University of Portsmouth
- Princeton University
- United States Naval Observatory
- University of Washington
- National Aeronautics and Space Administration
The study confirms the presence of AGN activity in 55% of the nine Ma < 1010 Me dwarf galaxies, and finds a similar CL detection rate to larger galaxies hosting AGNs. By analyzing the kinematics of the CL region and the scaling of gas velocity with ionization potential, the study investigates the connection between CLs and galaxy-wide outflows. The faster outflow velocities measured in [Si VI] compared to those in [O III], and the lack of J-band CN absorption features, provide further evidence that these outflows are driven by AGNs in low-mass galaxies.
We have obtained Keck near-infrared spectroscopy of a sample of nine Ma < 1010 Me dwarf galaxies to confirm active galactic nuclei (AGNs) activity and the presence of galaxy-wide, AGN-driven outflows through coronal line (CL) emission. We find strong CL detections in 5/9 galaxies (55%) with line ratios incompatible with shocks, confirming the presence of AGNs in these galaxies. Similar CL detection rates are found in larger samples of more massive galaxies hosting type 1 and 2 AGNs. We investigate the connection between the CLs and galaxy-wide outflows by analyzing the kinematics of the CL region as well as the scaling of gas velocity with ionization potential of different CLs. In addition, using complementary Keck Cosmic Web Imager observations of these objects, we find that the outflow velocities measured in [Si VI] are generally faster than those seen in [O III]. The galaxies with the fastest outflows seen in [O III] also have the highest [Si VI] luminosity. The lack of J-band CN absorption features, which are often associated with younger stellar populations, provides further evidence that these outflows are driven by AGNs in low-mass galaxies.
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