165 citations · 1.3k across the 24 of their papers we have counts for
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astro-ph2007★ 116 cited
The Discovery of an Active Galactic Nucleus in the Late-type Galaxy NGC 3621: Spitzer Spectroscopic Observations
S. Satyapal, D. Vega, T. Heckman +2
We report the discovery of an Active Galactic Nucleus (AGN) in the nearby SAd galaxy NGC 3621 using Spitzer high spectral resolution observations. These observations reveal the pre…
astro-ph2007★ 76 cited
Mid-Infrared Fine Structure Line Ratios in Active Galactic Nuclei Observed with Spitzer IRS: Evidence for Extinction by the Torus
R. P. Dudik, J. C. Weingartner, S. Satyapal +3
We present the first systematic investigation of the [NeV] (14um/24um) and [SIII] (18um/33um) infrared line flux ratios, traditionally used to estimate the density of the ionized g…