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A Comprehensive Study of 2 000 Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey: I. The Sample

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arxiv astro-ph/0603759 v1 pith:V4O5RH6Z submitted 2006-03-28 astro-ph

Hongyan Zhou , Tinggui Wang , Weimin Yuan , Honglin Lu , Xiaobo Dong , Junxian Wang , Youjun Lu This is my paper · ORCID
classification astro-ph
keywords samplegalaxiesaccuratelycarriedcontinuadigitalemissionfirst
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abstract

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 objects assigned as ``QSOs'' or ``galaxies'' in the spectroscopic sample of the Sloan Digital Sky Survey Data Release 3 (SDSS DR3) by a careful modeling of their emission lines and continua. The result is a uniform sample comprising $\sim 2~000$ NLS1. This sample dramatically increases the number of known NLS1 by a factor of $\sim 10$ over previous compilations. This paper presents the parameters of the prominent emission lines and continua, which were measured accurately with typical uncertainties $<10%$. Taking advantage of such an unprecedented large and uniform sample with accurately measured spectral parameters, we carried out various statistical analysis, some of which were only possible for the first time (abbreviated).

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Cited by 3 Pith papers

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  1. Extreme outflow velocities and weak UV emission lines indicate quasars shedding their dust cocoons

    astro-ph.GA 2026-07 unverdicted novelty 6.0 of 10

    Six z~2-3 quasars with extreme LoBAL outflows and weak UV lines are interpreted as weak-emission-line quasars emerging from dust cocoons via disc winds that shatter grains and produce steeper extinction.

  2. Little Red Dots as Supermassive Analogs of SS 433

    astro-ph.HE 2026-06 unverdicted novelty 6.0 of 10

    LRDs are interpreted as high-inclination hyper-Eddington accreting SMBHs analogous to SS 433, with V-shaped SEDs, X-ray weakness, and Balmer breaks emerging from disk self-shielding geometry.

  3. Unveil the nature of JWST-AGN and Little Red Dots with SKAO continuum surveys

    astro-ph.GA 2026-06 unverdicted novelty 3.0 of 10

    SKAO continuum surveys will detect radio emission from JWST AGN and LRDs and distinguish between Compton-thick absorption, intrinsically weak accretion, and dense gas cocoon scenarios.

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