STIS follow-up spectroscopy of Seyfert galaxies from Cycle 11 near-UV imaging survey

Physics

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Hst Proposal Id #10215 Agn/Quasars

Scientific paper

We propose a near-UV {3000-5500AA} long-slit spectroscopic study of a sample of 23 Seyfert galaxies with bright circumnuclear U-band structures, selected from our Cycle 11 ACS near-UV snapshot survey. This survey collected HST U-band images for 78 galaxies, which also have optical and near-IR images available in the archive. We propose to enrich this image database with STIS spectra in the near-UV. The novel aspect of the present proposal is the availability of the near-UV images which will allow us to select the best slit centering and orientation to probe the circumnuclear structures. Our goal is to investigate the nature of these structures, characterizing the circumnuclear continuum and ionizing source of these galaxies at a spatial resolution of sim10 parsecs, where we will probe the black hole environment. With the proposed observations, we will derive properties of the circumnuclear stellar populations of the selected galaxies {ages, masses and metallicities}, evolutionary effects connecting the growth of the black hole with the growth of the galaxy bulge, as well as the relation between the black hole mass, accretion rate {luminosity} and the circumnuclear stellar population properties. This dataset will also allow us to study the effect of the bulge and black hole on the evaporation of young star clusters in these galaxies.

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