2012/12/06 by Erika Benítez, Jairo Méndez-Abreu, Isaura Fuentes-Carrera +6
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Galaxies: Formation, Evolution, Phenomena #astro-ph.CO
paper · pdf · doi:10.1088/0004-637x/763/2/136
published as 2013 ApJ 763, Number 2, 136 · 32 pages, 12 figures, 3 tables, accepted for publication in ApJ, Dec 04 2012. Subjects: Cosmology and Extragalactic Astrophysics (astro-ph.CO)
arxiv created 2012/12/06 · openalex publication_date 2013/01/17 · arxiv updated 2013/01/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
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.