Sign on
ADS Classic is now deprecated. It will be completely retired in October 2019. This page will automatically redirect to the new ADS interface at that point.

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· arXiv e-print (arXiv:1007.1676)
· References in the article
· Citations to the Article (2) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
The Southern 2MASS Active Galactic Nuclei Survey: Spectroscopic Follow-up with Six Degree Field
Authors:
Masci, Frank J.; Cutri, Roc M.; Francis, Paul J.; Nelson, Brant O.; Huchra, John P.; Heath Jones, D.; Colless, Matthew; Saunders, Will
Affiliation:
AA(Infrared Processing and Analysis Center, Caltech 100-22, Pasadena, CA 91125, USA ), AB(Infrared Processing and Analysis Center, Caltech 100-22, Pasadena, CA 91125, USA), AC(Australian National University, ACT 0200, Australia), AD(Infrared Processing and Analysis Center, Caltech 100-22, Pasadena, CA 91125, USA; Vermont Academy, Saxtons River, VT 05154, USA), AE(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA), AF(Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia), AG(Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia), AH(Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia)
Publication:
Publications of the Astronomical Society of Australia, Volume 27, Issue 3, pp. 302-320. (PASA Homepage)
Publication Date:
09/2010
Origin:
PASA
Astronomy Keywords:
galaxies: active, quasars: general, infrared: general, surveys
Abstract Copyright:
(c) 2010 Astronomical Society of Australia
DOI:
10.1071/AS10001
Bibliographic Code:
2010PASA...27..302M

Abstract

The Two Micron All-Sky Survey (2MASS) has provided a uniform photometric catalog to search for previously unknown red active galactic nuclei (AGN) and Quasi-Stellar Objects (QSOs). We have extended the search to the southern equatorial sky by obtaining spectra for 1182 AGN candidates using the six degree field (6dF) multifibre spectrograph on the UK Schmidt Telescope. These were scheduled as auxiliary targets for the 6dF Galaxy Redshift Survey. The candidates were selected using a single color cut of J-Ks>2 to Ks<~15.5 and a galactic latitude of |b|>30°. 432 spectra were of sufficient quality to enable a reliable classification. 116 sources (~27%) were securely classified as type I AGN, 20 as probable type I AGN, and 57 as probable type II AGN. Most of them span the redshift range 0.05<z<0.5 and only 8 (~6%) were previously identified as AGN or QSOs. Our selection leads to a significantly higher AGN identification rate amongst local galaxies (>20%) than in any previous (mostly blue-selected) galaxy survey. A small fraction of the type I AGN could have their optical colors reddened by optically thin dust with AV<2mag relative to optically selected QSOs. A handful show evidence of excess far-infrared (IR) emission. The equivalent width (EW) and color distributions of the type I and II AGN are consistent with AGN unified models. In particular, the EW of the [Oiii] emission line weakly correlates with optical-near-IR color in each class of AGN, suggesting anisotropic obscuration of the AGN continuum. Overall, the optical properties of the 2MASS red AGN are not dramatically different from those of optically-selected QSOs. Our near-IR selection appears to detect the most near-IR luminous QSOs in the local universe to z~=0.6 and provides incentive to extend the search to deeper near-IR surveys.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)


Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints