ICON
NAVO Directory
X Tip: What's a "Resource"?
Hosted By
STScI Home
Space Telescope
Science Institute

Resource Record Summary

Catalog Service:
Luminous radio galaxies & type-2 quasars

Short name: J/MNRAS/436/997
IVOA Identifier: ivo://CDS.VizieR/J/MNRAS/436/997Publisher: CDS[+][Pub. ID]
More Info: http://cdsarc.unistra.fr/cgi-bin/cat/J/MNRAS/436/997
VO Compliance: Level 2: This is a VO-compliant resource.
Status: active
Registered: 2016 Jun 24 13:06:44Z
Get XML

Description


We present the results of a comparison between the environments of (1) a complete sample of 46 southern 2-Jy radio galaxies at intermediate redshifts (0.05<z<0.7), (2) a complete sample of 20 radio-quiet type-2 quasars (0.3<=z<=0.41), and (3) a control sample of 107 quiescent early-type galaxies at 0.2<=z<0.7 in the Extended Groth Strip. The environments have been quantified using angular clustering amplitudes (Bgq) derived from deep optical imaging data. Based on these comparisons, we discuss the role of the environment in the triggering of powerful radio-loud and radio-quiet quasars. When we compare the Bgq distributions of the type-2 quasars and quiescent early-type galaxies, we find no significant difference between them. This is consistent with the radio-quiet quasar phase being a short-lived but ubiquitous stage in the formation of all massive early-type galaxies. On the other hand, powerful radio galaxies are in denser environments than the quiescent population, and this difference between distributions of Bgq is significant at the 3{sigma} level. This result supports a physical origin of radio loudness, with high-density gas environments favouring the transformation of active galactic nucleus (AGN) power into radio luminosity, or alternatively, affecting the properties of the supermassive black holes themselves. Finally, focusing on the radio-loud sources only, we find that the clustering of weak-line radio galaxies (WLRGs) is higher than the strong-line radio galaxies (SLRGs), constituting a 3{sigma} result. 82 percent of the 2-Jy WLRGs are in clusters, according to our definition (Bgq>~400), versus only 31 percent of the SLRGs.

More About this Resource

[+] About the Resource Providers

This section describes who is responsible for this resource

[+] Status of This Resource

This section provides some status information: the resource version, availability, and relevant dates.

[+] What This Resource is About

This section describes what the resource is, what it contains, and how it might be relevant.

[+] Data Coverage Information

This section describes the data's coverage over the sky, frequency, and time.

[+] Rights and Usage Information

This section describes the rights and usage information for this data.

Available Service Interfaces

[+] Custom Service

This is service that does not comply with any IVOA standard but instead provides access to special capabilities specific to this resource.

[+] Custom Service

This is service that does not comply with any IVOA standard but instead provides access to special capabilities specific to this resource.

[+] Table Access Protocol - Auxiliary ServiceXX

This is a standard IVOA service that takes as input an ADQL or PQL query and returns tabular data.

[+] Simple Cone SearchXXSearch Me

This is a standard IVOA service that takes as input a position in the sky and a radius and returns catalog records with positions within that radius.

[+] Simple Cone SearchXXSearch Me

This is a standard IVOA service that takes as input a position in the sky and a radius and returns catalog records with positions within that radius.

[+] Simple Cone SearchXXSearch Me

This is a standard IVOA service that takes as input a position in the sky and a radius and returns catalog records with positions within that radius.

[+] Simple Cone SearchXXSearch Me

This is a standard IVOA service that takes as input a position in the sky and a radius and returns catalog records with positions within that radius.



Developed with the support of the National Science Foundation
under Cooperative Agreement AST0122449 with the Johns Hopkins University
The NAVO project is a member of the International Virtual Observatory Alliance

This NAVO Application is hosted by the Space Telescope Science Institute

Member
ivoa logo
Contact Us