NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-20 T16:06:25 PDT
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For refcode 2008ApJ...684..270K:
Retrieve 18 NED objects in this reference.
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NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2008ApJ...684..270K Properties of Polycyclic Aromatic Hydrocarbons in Local Elliptical Galaxies Revealed by the Infrared Spectrograph on Spitzer Kaneda, H.; Onaka, T.; Sakon, I.; Kitayama, T.; Okada, Y.; Suzuki, T. Abstract. We performed mid-infrared spectroscopic observations of 18 local dusty elliptical galaxies by using the Infrared Spectrograph (IRS) on board Spitzer. We have significantly detected polycyclic aromatic hydrocarbon (PAH) features from 14 out of the 18 galaxies and, thus, found that the presence of PAHs is not rare but rather common in dusty elliptical galaxies. Most of these galaxies show an unusually weak 7.7 micron emission feature relative to 11.3 and 17 micron emission features. A large fraction of the galaxies also exhibit H_2_ rotational line and ionic fine-structure line emissions, which have no significant correlation with the PAH emissions. The PAH features are well correlated with the continuum at 35 micron, whereas they are not correlated with the continuum at 6 micron. We conclude that the PAH emission of the elliptical galaxies is mostly of interstellar origin rather than of stellar origin, and that the unusual PAH Interband strength ratios are likely to be due to a large fraction of neutral to ionized PAHs. Key words: ISM: Dust, Extinction, Galaxies: Elliptical and Lenticular, cD, Galaxies: ISM, Infrared: ISM, ISM: Lines and Bands
Retrieve 18 NED objects in this reference.
Please click here for ADS abstract

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