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EXCITATION MECHANIS...
EXCITATION MECHANISMS FOR HCN(1-0) AND HCO+ (1-0) IN GALAXIES FROM THE GREAT OBSERVATORIES ALL-SKY LIRG SURVEY
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- Privon, G. (författare)
- University of Virginia,Universidad de Concepción,University of Concepcion,California Institute of Technology (Caltech)
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- Herrero-Illana, R. (författare)
- Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA)
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- Evans, A. S. (författare)
- National Radio Astronomy Observatory,University of Virginia
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- Iwasawa, K. (författare)
- Universitat de Barcelona,University of Barcelona
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- Perez-Torres, Miguel Angel (författare)
- Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA)
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- Armus, L. (författare)
- Spitzer Science Center, United States
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- Diaz-Santos, T. (författare)
- Spitzer Science Center, United States,Universidad Diego Portales,Diego Portales University
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- Murphy, E. J. (författare)
- California Institute of Technology (Caltech)
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- Stierwalt, S. (författare)
- University of Virginia
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- Aalto, Susanne, 1964 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Mazzarella, J. (författare)
- California Institute of Technology (Caltech)
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- Barcos-Munoz, Loreto (författare)
- University of Virginia
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- Borish, H. J. (författare)
- University of Virginia
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Inami, H. (författare)
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- Kim, D. C. (författare)
- National Radio Astronomy Observatory
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- Treister, E. (författare)
- Universidad de Concepción,University of Concepcion
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- Surace, J. A. (författare)
- Spitzer Science Center, United States
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- Lord, S. (författare)
- SETI Institute
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- Conway, John, 1963 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Frayer, D. (författare)
- National Radio Astronomy Observatory
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- Alberdi, Antxon (författare)
- Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA)
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(creator_code:org_t)
- 2015
- 2015
- Engelska.
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Ingår i: Astrophysical Journal. - 1538-4357 .- 0004-637X. ; 814:1
- Relaterad länk:
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http://publications.... (primary) (free)
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- We present new Institut de Radioastronomie Millimetrique (TRAM) 30 m spectroscopic observations of the similar to 88 GHz band, including emission from the CCH (N = 1 -> 0) multiplet, HCN (J = 1 -> 0), HCO (J = 1 -> 0), and HNC (J = 1 -> 0), for a sample of 58 local luminous and ultraluminous infrared galaxies from the Great Observatories All-sky LIRG Survey (GOALS). By combining our new TRAM data with literature data and Spitzer /IRS spectroscopy, we study the correspondence between these putative tracers of dense gas and the relative contribution of active galactic nuclei (AGNs) and star formation to the mid-infrared luminosity of each system. We find the HCN (1-0) emission to be enhanced in AGN-dominated systems (L'(HCN(1 0))/ L'(HCO+(1-o))) = 1.84), compared to composite and starburst-dominated systems (L'HCN(1413/(1-0)) = 1.14, and 0.88, respectively). However, some composite and starburst systems have LH/ CN (1 0) /LH/ CO (1 0) ratios comparable to those of AGNs, indicating that enhanced HCN emission is not uniquely associated with energetically dominant AGNs. After removing AGN-dominated systems from the sample, we find a linear relationship (within the uncertainties) between logio(L'(HCN(1-0))) and log(10)(LIR), consistent with most previous findings. Lc N(1 0) /LIR, typically interpreted as the dense-gas depletion time, appears to have no systematic trend with LIR for our sample of luminous and ultraluminous infrared galaxies, and has significant scatter. The galaxyintegrated L'(HCN(1-0)) and L'(HCO+(1-0)) emission do not appear to have a simple interpretation in terms of the AGN dominance or the star formation rate, and are likely determined by multiple processes, including density and radiative effects.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- galaxies: starburst
- galaxies: active
- galaxies: ISM
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- art (ämneskategori)
- ref (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Privon, G.
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Herrero-Illana, ...
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Evans, A. S.
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Iwasawa, K.
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Perez-Torres, Mi ...
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Armus, L.
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visa fler...
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Diaz-Santos, T.
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Murphy, E. J.
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Stierwalt, S.
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Aalto, Susanne, ...
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Mazzarella, J.
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Barcos-Munoz, Lo ...
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Borish, H. J.
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Inami, H.
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Kim, D. C.
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Treister, E.
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Surace, J. A.
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Lord, S.
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Conway, John, 19 ...
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Frayer, D.
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Alberdi, Antxon
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visa färre...
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Chalmers tekniska högskola