NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T17:53:03 PDT
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For refcode 2011A&A...527A.150L:
Retrieve 28 NED objects in this reference.
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2011A&A...527A.150L A survey of HC_3_N in extragalactic sources. Is HC_3_N a tracer of activity in ULIRGs? Lindberg, J. E.; Aalto, S.; Costagliola, F.; Perez-Beaupuits, J.-P.; Monje, R.; Muller, S. Abstract. Context. HC_3_N is a molecule that is mainly associated with Galactic star-forming regions, but it has also been detected in extragalactic environments. Aims: To present the first extragalactic survey of HC_3_N, when combining earlier data from the literature with six new single-dish detections, and to compare HC_3_N with other molecular tracers (HCN, HNC), as well as other properties (silicate absorption strength, IR flux density ratios, C II flux, and megamaser activity). Methods: We present mm IRAM 30 m, OSO 20 m, and SEST observations of HC_3_N rotational lines (mainly the J = 10-9 transition) and of the J = 1-0 transitions of HCN and HNC. Our combined HC_3_N data account for 13 galaxies (excluding the upper limits reported for the non-detections), while we have HCN and HNC data for more than 20 galaxies. Results: A preliminary definition "HC_3_N-luminous galaxy" is made based upon the HC_3_N/HCN ratio. Most (~80%) HC_3_N-luminous galaxies seem to be deeply obscured galaxies and (U)LIRGs. A majority (~60% or more) of the HC_3_N-luminous galaxies in the sample present OH mega- or strong kilomaser activity. A possible explanation is that both HC_3_N and OH megamasers need warm dust for their excitation. Alternatively, the dust that excites the OH megamaser offers protection against UV destruction of HC_3_N. A high silicate absorption strength is also found in several of the HC_3_N-luminous objects, which may help the HC_3_N to survive. Finally, we find that a high HC_3_N/HCN ratio is related to a high dust temperature and a low C II flux. Key words: galaxies: ISM, galaxies: starburst, galaxies: active, radio lines: galaxies, radio lines: ISM, ISM: molecules
Retrieve 28 NED objects in this reference.
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