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Sloan digital sky survey: Early data release
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere and collect spectra of ≈106 galaxies, 100,000Expand
Active Galactic Nuclei: From the Central Black Hole to the Galactic Environment
Preface What Are Active Galactic Nuclei? And Why Does Anyone Care? 2 How to Find AGNs 3 Evolution 4 Global Energetics and Black Holes 5 Black Hole Physics 6 Spherical Accretion 7 Accretion Disks andExpand
The Discrete Correlation Function: a New Method for Analyzing Unevenly Sampled Variability Data
TLDR
It is shown that physical interpretation of active galactic nuclei cross-correlation functions requires knowledge of the input function's fluctuation power spectrum, involves model-dependence in the form of symmetry assumptions, and must take into account intrinsic scale bias. Expand
CANDIDATE TYPE II QUASARS FROM THE SLOAN DIGITAL SKY SURVEY. I. SELECTION AND OPTICAL PROPERTIES OF A SAMPLE AT 0.3 < Z < 0.83
Type II quasars are the long-sought luminous analogs of type 2 (narrow emission line) Seyfert galaxies, suggested by unification models of active galactic nuclei (AGNs) and postulated to account forExpand
SPACE DENSITY OF OPTICALLY SELECTED TYPE 2 QUASARS
Type 2 quasars are luminous active galactic nuclei whose central regions are obscured by large amounts of gas and dust. In this paper, we present a catalog of type 2 quasars from the Sloan DigitalExpand
Ultraviolet-Optical Observations of the Seyfert 2 Galaxies NGC 7130, NGC 5135, and IC 3639: Implications for the Starburst-Active Galactic Nucleus Connection
We present and discuss Hubble Space Telescope (HST) (WFPC2 and FOC) images and ultraviolet (GHRS) spectra plus ground-based optical spectra of three Seyfert 2 nuclei (NGC 7130, NGC 5135 and IC 3639).Expand
Active galactic nuclei in the sloan digital sky survey. II. Emission-line luminosity function
The emission-line luminosity function of active galactic nuclei (AGNs) is measured from about 3000 AGNs included in the main galaxy sample of the Sloan Digital Sky Survey within a redshift range of 0Expand
Infrared spectra of obscuring dust tori around active galactic nuclei. I - Calculational method and basic trends
Using a new 2D radiative transfer algorithm, we have calculated the thermally reradiated infrared spectra of the compact dust tori which are thought to surround many AGN. These tori radiateExpand
Molecular tori in Seyfert galaxies - Feeding the monster and hiding it
The principal properties of the tori of gas which surround Seyfert nuclei are discussed. The internal state of the clouds and their size distribution function are examined, and it is shown that theExpand
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