NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-19 T05:37:46 PDT
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For refcode 2000ApJ...529..219S:
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2000ApJ...529..219S Mid-Infrared Infrared Space Observatory Spectroscopy of the Prototypical LINER NGC 1052: Shocks Reconsidered H. Sugai and M. A. Malkan Received 1999 March 12; accepted 1999 September 9 ABSTRACT We have observed the prototypical LINER NGC 1052 with the Infrared Space Observatory Short-Wavelength Spectrometer. While we have detected the [Ne II] 12.8 micron line, we have obtained a strict upper limit for the [Ne III] 15.6 micron line. A large [Ne II]/[Ne III] line ratio and small [Ne III]/[O III] {lambda}5007 and [Ne II]/[OIII] line ratios are consistent with slow-shock models with ~130 km s^-1^ shock velocity. Our results support the original suggestions of shock excitation as a dominant source for NGC 1052. We have fitted the infrared and optical line ratios with a combination of shock and photoionization models. The best combination among the simple models we considered suggests that the contribution of shock and photoionization to [O III] {lambda}5007 emission is four-fifths and one- fifth, respectively. Subject headings: galaxies: active-galaxies: individual (NGC 1052) - galaxies: nuclei-infrared: galaxies-line: formation
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