Poster Title: Super Massive Black Holes masses in spiral galaxies. HST-STIS observations for 3 new objects
Abstract: We present long-slit HST-STIS measurements of the ionized gas kinematics in the nucleus of three spiral galaxies, namely NGC 2179, NGC 4343 and NGC 4435. The sample galaxies have been selected by means of ground based spectroscopy. Indeed, they are characterized by a strong central velocity gradient of ionized gas which is consistent with the presence of a SMBH. For each target galaxy we obtained the Ha and [NII] 6583 A kinematics along the major axis and two 0"25 offset position on the two sides of the nucleus. Out of three objects, only NGC 4435 turned out to have a ionized gas disk in regular motion. Preliminary modeling indicates a SMBH mass upper limit of 2e6 solar masses, which is definitely below the M-sigma relation for galaxies.
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