Characterization of a Sample of Intermediate-type Active Galactic Nuclei. II. Host Bulge Properties and Black Hole Mass Estimates

Benítez, Erika; Méndez-Abreu, J.; Fuentes-Carrera, Isaura; Cruz-González, Irene; Martínez, Benoni; López-Martín, L.; Jiménez-Bailón, Elena; Chavushyan, Vahram; León-Tavares, Jonathan
Bibliographical reference

The Astrophysical Journal, Volume 763, Issue 2, article id. 136, 13 pp. (2013).

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2
2013
Number of authors
9
IAC number of authors
2
Citations
9
Refereed citations
9
Description
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+10 –17% 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-σ* relation and found them within a range of 5.69 ± 0.21 < log M σ*BH < 8.09 ± 0.24. Comparing these M σ*BH values with masses derived from the FWHM of Hβ and the continuum luminosity at 5100 Å from their SDSS-DR7 spectra (M BH), we find that 8 out of 10 (80+7 –17%) galaxies have black hole masses that are compatible within a factor of 3. This result would support that M BH and M σ*BH 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+18 –15%) objects of the sample have their M σ*BH and M BH compatible within 3σ errors. We also find that estimations based on the M BH-σ* relation for pseudobulges are not compatible in 50% ± 20% of the objects.
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