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A hard x-ray test o...
A hard x-ray test of hcn enhancements as a tracer of embedded black hole growth
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- Privon, G. (författare)
- University of Florida
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- Ricci, C. (författare)
- Beijing University of Technology,George Mason University,Universidad Diego Portales,Diego Portales University
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- Aalto, Susanne, 1964 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Viti, Serena (författare)
- University College London (UCL)
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- Armus, Lee (författare)
- California Institute of Technology (Caltech)
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- Diaz-Santos, T. (författare)
- Chinese Academy of Sciences,Universidad Diego Portales,Diego Portales University
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- Gonzalez-Alfonso, E. (författare)
- Universidad de Alcala,University of Alcalá
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- Iwasawa, K. (författare)
- Institucio Catalana de Recerca i Estudis Avancats (ICREA),Catalan Institution for Research and Advanced Studies (ICREA),Universitat de Barcelona,University of Barcelona
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- Jeff, D. L. (författare)
- University of Florida
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- Treister, E. (författare)
- Pontificia Universidad Catolica de Chile
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- Bauer, F. E. (författare)
- Instituto Milenio de Astrofísica,Millennium Institute of Astrophysics,Pontificia Universidad Catolica de Chile,Space Science Institute
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- Evans, A. S. (författare)
- National Radio Astronomy Observatory,University of Virginia
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- Garg, P. (författare)
- University of Florida
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- Herrero-Illana, R. (författare)
- European Southern Observatory Santiago,Institut de Ciències de l'Espai (ICE) - CSIC,Institute of Space Sciences (ICE) - CSIC
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- Mazzarella, J. (författare)
- California Institute of Technology (Caltech)
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- Larson, K. (författare)
- California Institute of Technology (Caltech)
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- Blecha, L. (författare)
- University of Florida
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- Barcos-Muoz, L. (författare)
- National Radio Astronomy Observatory
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- Charmandaris, V. (författare)
- Panepistimio Kritis,University of Crete,Idryma Technologias kai Erevnas (FORTH),Foundation for Research and Technology Hellas (FORTH)
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- Stierwalt, S. (författare)
- California Institute of Technology (Caltech),Occidental College
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- Pérez-Torres, M.A. (författare)
- Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA)
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(creator_code:org_t)
- 2020-04-24
- 2020
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 893:2
- Relaterad länk:
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https://discovery.uc...
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https://research.cha...
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https://research.cha...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- Enhanced emission from the dense gas tracer HCN (relative to HCO+) has been proposed as a signature of active galactic nuclei (AGN). In a previous single-dish millimeter line survey we identified galaxies with HCN/HCO+ (1-0) intensity ratios consistent with those of many AGN but whose mid-infrared spectral diagnostics are consistent with little to no (≲15%) contribution of an AGN to the bolometric luminosity. To search for putative heavily obscured AGN, we present and analyze NuSTAR hard X-ray (3-79 keV) observations of four such galaxies from the Great Observatories All-sky LIRG Survey. We find no X-ray evidence for AGN in three of the systems and place strong upper limits on the energetic contribution of any heavily obscured (NH > 1024 cm-2) AGN to their bolometric luminosity. The upper limits on the X-ray flux are presently an order of magnitude below what XDR-driven chemistry models predict are necessary to drive HCN enhancements. In a fourth system we find a hard X-ray excess consistent with the presence of an AGN, but contributing only ∼3% of the bolometric luminosity. It is also unclear if the AGN is spatially associated with the HCN enhancement. We further explore the relationship between HCN/HCO+ (for several J upper levels) and LAGN/LIR f for a larger sample of systems in the literature. We find no evidence for correlations between the line ratios and the AGN fraction derived from X-rays, indicating that HCN/HCO+ intensity ratios are not driven by the energetic dominance of AGN, nor are they reliable indicators of ongoing supermassive black hole accretion. © 2020. The American Astronomical Society. All rights reserved
Ämnesord
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Nyckelord
- Dust
- Galaxies
- Infrared galaxies
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Privon, G.
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Ricci, C.
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Aalto, Susanne, ...
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Viti, Serena
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Armus, Lee
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Diaz-Santos, T.
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visa fler...
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Gonzalez-Alfonso ...
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Iwasawa, K.
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Jeff, D. L.
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Treister, E.
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Bauer, F. E.
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Evans, A. S.
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Garg, P.
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Herrero-Illana, ...
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Mazzarella, J.
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Larson, K.
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Blecha, L.
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Barcos-Muoz, L.
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Charmandaris, V.
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Stierwalt, S.
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Pérez-Torres, M. ...
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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och Subatomär fysik
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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och Astronomi astrof ...
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- NATURVETENSKAP
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NATURVETENSKAP
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och Atom och molekyl ...
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Chalmers tekniska högskola