

We present results from a multi-month reverberation mapping campaign undertaken primarily at MDM Observatory with supporting observations from around the world. We measure broad line region (BLR) radii and black hole masses for six objects. A velocity-resolved analysis of the H$\beta$ response shows the presence of diverse kinematic signatures in the BLR.

Reverberation mapping takes advantage of the presence of a time delay or lag, $\tau$, between continuum and emission line flux variations observed through spectroscopic monitoring campaigns to infer the radius of the broad line region (BLR) and, subsequently, the central black hole mass in type 1 AGNs. The primary goal of this campaign was to obtain either new or improved H$\beta$ reverberation lag measurements for several relatively low luminosity AGNs. Using cross correlation techniques to measure the time delay between the mean optical continuum flux density around 5100Å and the integrated H$\beta$ flux, we determine the H$\beta$ lags and black hole mass measurements listed in Columns 2 and 3 of Table 1, respectively. Column 4 tells if this measurement is new, an improvement meant to replace a previous, less reliable measurement, or simply an additional measurement not used to replace a previous value. The complete results from this study are currently being prepared for publication (Denney et al., in preparation). A subsequent velocity-resolved analysis of the H$\beta$response shows that three of the six primary targets demonstrate kinematic signatures (Column 5) of infall, outflow, and non-radial virialized motions (see @Denney09 [Denney et al. 2009]).

  Object     $\tau_{\rm cent}$(days)   M$_{\rm BH}(\times 10^6 {\rm M}_\odot)$       Data Use        Kinematic Signature
  --------- ------------------------- ----------------------------------------- ------------------- ---------------------
  NGC3227    $3.75^{+0.76}_{-0.82}$            $7.63^{+1.62}_{-1.72}$               improvement            infall
  NGC3516    $11.68^{+1.02}_{-1.53}$            $31.7^{+2.8}_{-4.2}$                improvement            outflow
  NGC5548    $12.40^{+2.74}_{-3.85}$            $44.2^{+9.9}_{-13.8}$            add'l measurement         virial
  Mrk290     $8.72^{+1.21}_{-1.02}$             $24.3^{+3.7}_{-3.7}$                    new                   —
  Mrk817     $14.04^{+3.41}_{-3.47}$           $61.9^{+15.0}_{-15.3}$            add'l measurement            —
  NGC4051    $1.87^{+0.54}_{-0.50}$            $1.73^{+0.55}_{-0.52}$               improvement               —

  : Mean H$\beta$ Lags and Black Hole Masses

2009, *ApJL*, 704, L80

{'source': 'arXiv_out/0910'}