M94 as a Unique Testbed for Black Hole Mass Estimates and AGN Activity at Low Luminosities
Figure 2
NGC 4736 within emission-line diagnostic diagrams. Filled circles reflect measurements based on the Palomar observations. Diamonds represent measurements from Moustakas and Kennicutt Jr. [45], while crosses show measurements from our MMT spectrum. The vertical bands indicate the -STIS measurements and the associated errors (with no correction for reddening; O III] and are not available in the spectra). The solid (black) curves indicate the Kewley et al. [6] classification, while the dotted (blue) lines indicate criteria used by Ho et al. [43]. The background grey points correspond to measurements of SDSS nearby galaxies from Constantin et al. [19].
