Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30291f&link_type=abstract
Spitzer Proposal ID #30291
Physics
Scientific paper
As AGNs are intimately related to dust, it is essential to study them at wavelengths which minimize the obscuring effects of dust extinction, while maximizing the dust emission diagnostics. IRS spectroscopy will be able to measure the fine structure lines from the ionized gas excited both from black hole accretion and from stellar ionization, and also lines from H2 as diagnostics of PDRs, shock excitation from starbursts, and hard X-ray heating from the AGN. By combining our proposed observations with similar ones in the ROC, we will assemble a complete database sample of active galaxies - the "12 Micron Sample" of 53 Seyfert 1s and 63 Seyfert 2's. We will address five goals. (i) Test the evolutionary scenario (of HII, Seyfert 2, Seyfert 1) by comparing over activity type observable physical quantities such as: the hardness of the ionizing continuum; the star formation rate and the dust extinction; (ii) establish what is the contribution to the total energy budget in each galaxy arising from black hole accretion and from star formation activity in the Local Universe. This will be done by separating spectroscopically through detailed modeling the AGN from the starburst component; (iii) characterize the star formation activity in Seyfert galaxies; (iv) derive the fraction of radiant energy in the local Universe produced by stars and that produced by accretion onto massive black holes, and derive the respective luminosity functions; (v) assess the importance of bolometric luminosity, ionizing radiation, and nuclear physical conditions to classification schemes. Our observations will enable us to produce accurate local templates for application to AGNs in the early epochs of the Universe.
Andreani Paola
Ashby Matt
Fazio Giovanni
Gonzalez Eduardo
Hunt Leslie
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