CHARACTERIZATION OF A SAMPLE OF INTERMEDIATE-TYPE ACTIVE GALACTIC NUCLEI. II. HOST BULGE PROPERTIES AND BLACK HOLE MASS ESTIMATES

We present a study of the host bulge properties and their relations with the black hole mass for a sample of 10 intermediate-type active galactic nuclei (AGNs). Our sample consists mainly of early-type spirals, four of them hosting a bar. For 70(-17)(+10)% of the galaxies, we have been able to determine the type of the bulge, and find that these objects probably harbor a pseudobulge or a combination of classical bulge/pseudobulge, suggesting that pseudobulges might be frequent in intermediate-type AGNs. In our sample, 50% +/- 14% of the objects show double-peaked emission lines. Therefore, narrow double-peaked emission lines seem to be frequent in galaxies harboring a pseudobulge or a combination of classical bulge/pseudobulge. Depending on the bulge type, we estimated the black hole mass using the corresponding M-BH-sigma* relation and found them within a range of 5.69 +/- 0.21 < log M-BH(sigma)* < 8.09 +/- 0.24. Comparing these M-BH(sigma)* values with masses derived from the FWHM of H beta and the continuum luminosity at 5100 angstrom from their SDSS-DR7 spectra (M-BH), we find that 8 out of 10 (80(-17)(+7)%) galaxies have black hole masses that are compatible within a factor of 3. This result would support that M-BH and M-BH(sigma)* are the same for intermediate-type AGNs, as has been found for type 1 AGNs. However, when the type of the bulge is taken into account, only three out of the seven (43(-15)(+18)%) objects of the sample have their M-BH(sigma)* and M-BH compatible within 3 sigma errors. We also find that estimations based on the M-BH-sigma* relation for pseudobulges are not compatible in 50% +/- 20% of the objects.