Assigned ID: 86 ----- Attempting Submission 1 (Wed Feb 22 11:59:25 GMT 2012) ----- ----- Attempting Submission 1 (Tue Jul 10 05:13:35 GMT 2012) ----- Calibrating black hole mass estimators using the enlarged sample of reverberation-mapped AGNs Accurate estimates of black hole masses are crucial to understanding the growth of black holes and the co- evolution of black holes and galaxies. Black hole masses can be determined in AGNs using the kinematics of the broad-line region based on the virial assumption. The velocity profiles of the Hbeta, Mg II, and CIV lines from single-epoch spectra are commonly used to infer the gas kinematics of low-z, mid-z, and high-z quasars, respectively. However, this method is well calibrated only in the local universe based on the Hbeta and Halpha lines, while high redshift results depend on the CIV- and Mg II-based mass estimators. Particularly, CIV results have been extensively debated, because of evidence for non-virial outflows and the effects of absorption. The best sample for calibrating single-epoch mass estimators is the set of reverberation-mapped AGNs with direct measurements of the BLR size, which provides a unique local baseline for determining the BLR size-luminosity relation and for calibrating UV mass estimators. We will test and calibrate single-epoch mass estimators, using the enlarged sample of reverberation-mapped AGNs by combining new data for 6 objects at M_BH < 10^7.5 M_sun, with archival data for 30 additional AGNs that have suitable previous UV observations. The enlarged sample provides an important new opportunity to better constrain and test the UV mass estimators by extending both the total sample size and the mass range over which the UV methods can be applied. We propose to obtain STIS UV and optical spectroscopy of 6 AGNs which currently lack high-quality UV spectra for measuring the C IV and Mg II line properties and UV continuum. We will use three gratings, i.e., G140L (∼1150-1700 ̊A), G230L (∼1600-3200 ̊A), and G430L (∼2900-5700 ̊A) to observe the C IV, Mg II, and Hβ lines as well as the important UV continuum. We collected GALEX FUV and NUV AB magnitudes and B band magnitude from our LAMP photometry (Walsh et al. 2009) for exposure time calculations (see Table 1). Based on the STIS ETC, we calculated the exposure time to achieve S/N∼15-20 per resolution element at continuum (1350 ̊A, 3000 ̊A, and 5100 ̊A, respectively) to securely measure the line width (FWHM and line dispersion) after subtracting the continuum. For a source with FUV=17, NUV=17, and B=17, the required exposure time is ∼1800 sec with G140L, ∼1400 sec with G230L, and ∼ 250 sec with G430L using the 52X0.2 slit. Thus, for bright objects in our sample (see Table 1), 2 orbits can provide the entire FUV to optical spectra, including guide star and target acquisition, and 8 min. and 5 min. overhead for MAMA and CCD exposures, respectively. For 3 fainter objects with FUV∼18, longer exposure time is necessary to the same S/N, and we request 3 orbits for these objects. Considering potential variability of the UV continuum (a factor of ∼2) and S/N requirements, we ask for a total of 15 orbits for the sample of 6 AGNs. For the STIS CCD observations, we will use the recommended E1 aperture position to minimize CTE losses. We will obtain either 2 or 3 dithered exposures in each grating setting (dithered along the slit) in order to optimally clean cosmic-ray hits and bad pixels, and our STIS CCD exposures will be < 1000 sec each, as recommended in the STIS handbook. AGN/QUASARS 12 false 0.0 0.0 false false false false SUPPORTED GALAXY BLR SEYFERT This object was generated by the targetselector and retrieved from the NED database. J2000 J2000 GALAXY BLR SEYFERT This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY BLR SEYFERT This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY BLR SEYFERT This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY BLR SEYFERT J2000 J2000 GALAXY BLR SEYFERT This object was generated by the targetselector and retrieved from the SIMBAD database. 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