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A Comprehensive Study of 2000 Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey. I. The Sample

This is the first paper in a series dedicated to the study of the emission-line and continuum properties of narrow line Seyfert 1 galaxies (NLS1s). We carried out a systematic search for NLS1s from…
IOP Publishing (opens in a new tab)

ESTIMATING BLACK HOLE MASSES IN ACTIVE GALACTIC NUCLEI USING THE Mg ii λ2800 EMISSION LINE

We investigate the relationship between the linewidths of broad Mg ii λ2800 and Hβ in active galactic nuclei (AGNs) to refine them as tools to estimate black hole (BH) masses. We perform a detailed…
IOP Publishing (opens in a new tab)

Black hole mass and velocity dispersion of narrow line region in active galactic nuclei and narrow line Seyfert 1 galaxies

Controversy regarding whether Narrow Line Seyfert 1 galaxies (NLS1s) follow the same black hole -galactic bulge relation as normal galaxies has been raised by Mathur et al. ([CITE]) and Ferrarese et…
arXiv (opens in a new tab)

SDSS J094857.3+002225: A Very Radio Loud, Narrow-Line Quasar with Relativistic Jets?

We report the identification of a very radio loud, narrow-line quasar, SDSS J094857.3+002225, discovered in the Sloan Digital Sky Survey (SDSS) early data release (EDR). With FWHM (Hβ) ≈ 1500 km s-1…
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A Narrow-Line Seyfert 1-Blazar Composite Nucleus in 2MASX J0324+3410

We report the identification of 2MASX J032441.19+341045.9 (hereafter 2MASX J0324+3410) with an appealing object that shows the dual properties of both a narrow-line Seyfert 1 galaxy (NLS1) and a…
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A Comprehensive and Uniform Sample of Broad-line Active Galactic Nuclei from the SDSS DR7

A new, complete sample of 14,584 broad-line active galactic nuclei (AGNs) at z < 0.35 is presented, which are uncovered homogeneously from the complete database of galaxies and quasars observed…
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A wide star–black-hole binary system from radial-velocity measurements

Radial-velocity measurements of a Galactic B-type star show a dark companion that seems to be a black hole of about 68 solar masses, in a widely spaced binary system.
Springer (opens in a new tab)

THE BLUESHIFTING AND BALDWIN EFFECTS FOR THE [O iii] λ5007 EMISSION LINE IN TYPE 1 ACTIVE GALACTIC NUCLEI

We use homogeneous samples of radio-quiet Seyfert 1 galaxies and QSOs selected from the Sloan Digital Sky Survey to investigate the connection between the velocity shift and the equivalent width (EW)…
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WHAT CONTROLS THE Fe ii STRENGTH IN ACTIVE GALACTIC NUCLEI?

We used a large, homogeneous sample of 4178 z ⩽ 0.8 Seyfert 1 galaxies and QSOs selected from the Sloan Digital Sky Survey to investigate the strength of Fe ii emission and its correlation with other…
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SDSS J160531.84+174826.1: A Dwarf Disk Galaxy with an Intermediate-Mass Black Hole

We report the discovery of a dwarf Seyfert 1 active galactic nucleus (AGN) with a candidate intermediate-mass black hole, hosted by the dwarf galaxy SDSS J160531.84+174826.1 at z = 0.032. A broad…
IOP Publishing (opens in a new tab)
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