Search: onr:"swepub:oai:research.chalmers.se:86e685ca-ca90-4670-8c4c-89c974096090" >
Evidence for CO Sho...
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Meijerink, R.Rijksuniversiteit Groningen,University of Groningen,Universiteit Leiden (UL),Leiden University (UL)
(author)
Evidence for CO Shock Excitation in NGC 6240 from Herschel SPIRE Spectroscopy
- Article/chapterEnglish2013
Publisher, publication year, extent ...
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2013
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LIBRIS-ID:oai:research.chalmers.se:86e685ca-ca90-4670-8c4c-89c974096090
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https://doi.org/10.1088/2041-8205/762/2/L16DOI
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https://research.chalmers.se/publication/173288URI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
Notes
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We present Herschel SPIRE FTS spectroscopy of the nearby luminous infrared galaxy NGC 6240. In total 20 linesare detected, including CO J = 4−3 through J = 13−12, 6 H2O rotational lines, and [C i] and [N ii] fine-structurelines. The CO to continuum luminosity ratio is 10 times higher in NGC 6240 than Mrk 231. Although the COladdersof NGC 6240 and Mrk 231 are very similar, UV and/or X-ray irradiation are unlikely to be responsible for theexcitation of the gas in NGC 6240.We applied both C and J shock models to the H2 v = 1–0 S(1) and v = 2–1 S(1)lines and the CO rotational ladder. The CO ladder is best reproduced by amodel with shock velocity vs = 10 km s−1and a pre-shock density nH = 5 × 104 cm−3. We find that the solution best fitting the H2 lines is degenerate. The shock velocities and number densities range between vs = 17–47 km s−1 and nH = 107–5×104 cm−3, respectively.The H2 lines thus need a much more powerful shock than the CO lines.We deduce that most of the gas is currently moderately stirred up by slow (10 km s−1) shocks while only a small fraction (1%) of the interstellar mediumis exposed to the high-velocity shocks. This implies that the gas is rapidly losing its highly turbulent motions. We argue that a high CO line-to-continuum ratio is a key diagnostic for the presence of shocks.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Kristensen, L.Universiteit Leiden (UL),Leiden University (UL)
(author)
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Weiss, A.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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van der Werf, P.Universiteit Leiden (UL),Leiden University (UL)
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Walter, F.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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Spaans, M.Rijksuniversiteit Groningen,University of Groningen
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Loenen, A.F.Universiteit Leiden (UL),Leiden University (UL)
(author)
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Fischer, J.Naval Research Laboratory
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Israel, F. P.Universiteit Leiden (UL),Leiden University (UL)
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Isaak, K.European Space Research and Technology Centre (ESA ESTEC)
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Papadopoulos, P. P.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Aalto, Susanne,1964Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)saalto
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Armus, L.Spitzer Science Center, United States
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Charmandaris, V.Panepistimio Kritis,University of Crete
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Dasyra, K.M.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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Diaz-Santos, T.Spitzer Science Center, United States
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Evans, A.National Radio Astronomy Observatory,University of Virginia
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Gao, YuChinese Academy of Sciences
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Gonzalez-Alfonso, E.Universidad de Alcala,University of Alcalá
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Güsten, R.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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Henkel, C.King Abdulaziz University,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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Kramer, C.Institut de Radioastronomie Millimétrique (IRAM)
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Lord, S.California Institute of Technology (Caltech)
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Martin-Pintado, J.CSIC - Instituto de Estructura de la Materia (IEM)
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Naylor, D. A.University of Lethbridge
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Sanders, D. B.University of Hawaii
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Smith, H.Harvard-Smithsonian Center for Astrophysics
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Spinoglio, L.Istituto nazionale di astrofisica (INAF)
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Stacey, G.Cornell University
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Veilleux, S.University of Maryland
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Wiedner, M.C.Centre national de la recherche scientifique (CNRS)
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Rijksuniversiteit GroningenUniversiteit Leiden (UL)
(creator_code:org_t)
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In:Astrophysical Journal Letters762:2, s. L16-L202041-82132041-8205
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Meijerink, R.
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Kristensen, L.
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Weiss, A.
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van der Werf, P.
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Walter, F.
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Spaans, M.
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Loenen, A.F.
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Fischer, J.
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Israel, F. P.
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Isaak, K.
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Papadopoulos, P. ...
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Aalto, Susanne, ...
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Armus, L.
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Charmandaris, V.
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Dasyra, K.M.
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Diaz-Santos, T.
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Evans, A.
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Gao, Yu
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Gonzalez-Alfonso ...
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Güsten, R.
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Henkel, C.
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Kramer, C.
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Lord, S.
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Martin-Pintado, ...
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Naylor, D. A.
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Sanders, D. B.
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Smith, H.
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Spinoglio, L.
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Stacey, G.
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Veilleux, S.
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Wiedner, M.C.
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