The correlation between central black hole (BH) mass and bulge stellar velocity dispersion has become a fundamental tool to investigate the link between BH growth and galaxy formation. However, the current BH census in nearby galaxies is highly biased toward early-type galaxies. It is important to increase the number of direct BH mass measurements along the spiral sequence, not only to better delineate the M-sigma relation but also to verify tentative claims that the scatter and zero point of the relation may vary with galaxy morphology and the formation history of the bulge. With these goals in mind, we carried out an ACS/WFC narrow-band (F658N) imaging survey of nearby S0-Sbc galaxies to identify circumnuclear Halpha disks suitable for follow-up STIS spectroscopy. Past experience indicates that such a pre-selection strategy significantly improves the chances of obtaining successful dynamical models to measure BH masses. We found 6 good new candidates of circumnuclear gas disks in spiral galaxies. STIS G750M spectra will be obtained for each source using three parallel slits to map out the gas kinematics in the inner portion of the nuclear disks: a 52X0.1 slit centered on the nucleus and one flanking 52X0.2 slit positioned on each side of the nucleus. We will perform dynamical modeling to measure the central BH masses. If successful, this study will provide a significant increase in the current sample of spirals with secure BH masses, with important ramifications for improving and refining the M-sigma relation.

We will use the G750M grating with central wavelength set to 6581 Ang. Each galaxy will be observed with three slit positions, all aligned within +/- 5 deg of the major axis of the galaxy. The central position will use the 52X0.1 slit, which will be exposed for 2 orbits. Each flanking slit position will be offset by +/- 0.15", will use the 52X0.2 slit, and will be exposed for 1 orbit each. Each orbit will consist of 3 dithered exposures along the slit. We will use the nucleus for diffuse-source acquisition with flux-centering method and checkbox of 7 pixels. The nucleus will be placed at the E1 aperture position. AGN/QUASARS 12 false 0.0 0.0 false false false false false false SUPPORTED GALAXY NUCLEUS SEYFERT SPIRAL B=11.4 J2000 04 07 46.9100 +69 48 44.80 J2000 GALAXY NUCLEUS SEYFERT SPIRAL B=11.2 J2000 09 50 22.2300 +72 16 43.10 J2000 GALAXY NUCLEUS SEYFERT SPIRAL B=11.0 J2000 11 26 8.5800 +43 35 9.30 J2000 GALAXY NUCLEUS SEYFERT SPIRAL B=12.3 J2000 12 54 37.7900 +46 31 52.20 J2000 GALAXY NUCLEUS SEYFERT SPIRAL B=12.2 J2000 13 56 16.6700 +47 14 8.50 J2000 GALAXY NUCLEUS SEYFERT SPIRAL B=12.4 J2000 15 00 0.3900 +01 53 28.80 J2000 STIS/CCD Spectroscopic No No G750M 6581 STIS/CCD Spectroscopic No No G750M 6581 STIS/CCD Spectroscopic No No G750M 6581 STIS/CCD Spectroscopic No No G750M 6581 STIS/CCD Spectroscopic No No G750M 6581 STIS/CCD Spectroscopic No No G750M 6581 POS-TARG DITHER 0.15 LINE false false 3 90.0 STIS-ALONG-SLIT 1 false The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 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