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

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

2011-02-02

arxiv.org/abs/1102.0537v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

25 pages, 7 figures, submitted to ApJ

Scientific paper

We present HST/ACS observations of ten galaxies which host narrow line Seyfert 1 (NLS1) nuclei, believed to contain relatively smaller mass black holes accreting at high Eddington ratio. We deconvolved each ACS image into a nuclear point source (AGN), a bulge, and a disk and fitted the bulge and disk with Sersic profiles. We find that all ten galaxies lie below the Kormendy relation, so can be classified as having pseudobulges even though only four have Sersic indices less than 2. All ten galaxies lie below the black hole mass--bulge luminosity relation, confirming earlier results. Their locus is similar to that occupied by pseudobulges. We conclude that the black holes in narrow line Seyfert 1s are still growing and the growth is governed by secular processes, rather than by mergers. Active galaxies in pseudobulges point to an alternative track of black hole--galaxy co-evolution. Because of the intrinsic scatter in black hole mass--bulge properties scaling relations caused by a combination of factors such as the galaxy morphology, orientation, and redshift evolution, application of scaling relations to determine BH masses may not be as straightforward as has been hoped.

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