NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-03-26 T07:08:00 PDT
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For refcode 2013MNRAS.432..374R:
Retrieve 91 NED objects in this reference.
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NED Abstract

Copyright by Royal Astronomical Society. 2013MNRAS.432..374R A Spitzer-IRS spectroscopic atlas of early-type galaxies in the Revised Shapley-Ames Catalog Rampazzo, R.; Panuzzo, P.; Vega, O.; Marino, A.; Bressan, A.; Clemens, M. S. Abstract. We produce an atlas of homogeneously reduced and calibrated low-resolution IRS spectra of the nuclear regions of nearby early-type galaxies (ETGs, i.e. Es and S0s), in order to build a reference sample in the mid-infrared window. From the Spitzer Heritage Archive we extract ETGs in the Revised Shapley-Ames Catalog of Bright Galaxies having an IRS SL and/or LL spectrum. We recover 91 spectra out of 363 galaxies classified as ETGs in the catalogue: 56 E (E0-E6), 8 mixed E/S0+S0/E and 27 S0 (both normal and barred - SB0) plus mixed types SB0/Sa+SB0/SBa. For each galaxy, we provide the fully reduced and calibrated spectrum and the intensity of nebular and molecular emission lines as well as of the polycyclic aromatic hydrocarbons (PAHs) after a template spectrum of a passively evolving ETG has been subtracted. Spectra are classified into five mid-infrared classes, ranging from active galactic nuclei (class-4) and star-forming nuclei (class-3), to transition class-2 (with PAHs) and class-1 (no-PAHs), to passively evolving nuclei (class-0). A demographic study of mid-infrared spectra shows that Es are significantly more passive than S0s: 46^{+11}_{-10}_ per cent of Es and 20^{+11}_{-7}_ per cent of S0s have a spectrum of class-0. Emission lines are revealed in 64^{+12}_{-6}_ per cent of ETGs. The H_2_S(1) line is found with similar rate in Es (34^{+10}_{-8}_ per cent) and in S0s (51^{+15}_{-12}_ per cent). PAHs are detected in 47^{+8}_{-7}_ per cent of ETGs, but only 9^{+4}_{-3}_ per cent have PAH ratios typical of star-forming galaxies. Several indicators, such as peculiar morphologies and kinematics, the irregular shape of dust-lanes, and radio and X-ray properties, suggest that mid-infrared spectral classes are associated with phases of accretion/feedback phenomena occurring in the nuclei of ETGs. Key words: techniques: spectroscopic, galaxies: elliptical and lenticular, cD, galaxies: fundamental parameters, infrared: galaxies
Retrieve 91 NED objects in this reference.
Please click here for ADS abstract

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