Supermassive black holes, pseudobulges, and the narrow-line Seyfert 1 galaxies

Understand

We present HST/ACS observations of ten galaxies that host narrow-line Seyfert 1 (NLS1) nuclei, believed to contain relatively smaller mass black holes accreting at high Eddington ratios.

• We deconvolve each ACS image into a nuclear point source (AGN), a bulge, and a disk, and fitted the bulge with a Sersic profile and the disk with an exponential profile.
• We find that at least five galaxies can be classified as having pseudobulges.
• All ten galaxies lie below the \mbh--L$_{bulge}$ relation, confirming earlier results.