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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559509.0, MPI für Astronomie / Publikationen_mpia
Black hole accretion and star formation as drivers of gas excitation and chemistry in Markarian 231
Authors:van der Werf, P. P.; Isaak, K. G.; Meijerink, R.; Spaans, M.; Rykala, A.; Fulton, T.; Loenen, A. F.; Walter, F.; Weiß, A.; Armus, L.; Fischer, J.; Israel, F. P.; Harris, A. I.; Veilleux, S.; Henkel, C.; Savini, G.; Lord, S.; Smith, H. A.; González-Alfonso, E.; Naylor, D.; Aalto, S.; Charmandaris, V.; Dasyra, K. M.; Evans, A.; Gao, Y.; Greve, T. R.; Güsten, R.; Kramer, C.; Martí­n-Pintado, J.; Mazzarella, J.; Papadopoulos, P. P.; Sanders, D. B.; Spinoglio, L.; Stacey, G.; Vlahakis, C.; Wiedner, M. C.; Xilouris, E. M.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:A&A
Start Page:id.L42
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present a full high resolution SPIRE FTS spectrum of the nearby ultraluminous infrared galaxy Mrk 231. In total 25 lines are detected, including CO J = 5-4 through J = 13-12, 7 rotational lines of H2O, 3 of OH+ and one line each of H2O+, CH+, and HF. We find that the excitation of the CO rotational levels up to J = 8 can be accounted for by UV radiation from star formation. However, the approximately flat luminosity distribution of the CO lines over the rotational ladder above J = 8 requires the presence of a separate source of excitation for the highest CO lines. We explore X-ray heating by the accreting supermassive black hole in Mrk 231 as a source of excitation for these lines, and find that it can reproduce the observed luminosities. We also consider a model with dense gas in a strong UV radiation field to produce the highest CO lines, but find that this model strongly overpredicts the hot dust mass in Mrk 231. Our favoured model consists of a star forming disk of radius 560 pc, containing clumps of dense gas exposed to strong UV radiation, dominating the emission of CO lines up to J = 8. X-rays from the accreting supermassive black hole in Mrk 231 dominate the excitation and chemistry of the inner disk out to a radius of 160 pc, consistent with the X-ray power of the AGN in Mrk 231. The extraordinary luminosity of the OH+ and H2O+ lines reveals the signature of X-ray driven excitation and chemistry in this region.
Free Keywords:galaxies: individual: Mrk 231; galaxies: active; galaxies: ISM; galaxies: nuclei; galaxies: starburst; infrared: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL: [ID No:1]
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