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)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:1411.7388)
· References in the article
· Citations to the Article (17) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (28)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Black hole masses, accretion rates and hot- and cold-mode accretion in radio galaxies at z ˜ 1
Authors:
Fernandes, C. A. C.; Jarvis, M. J.; Martínez-Sansigre, A.; Rawlings, S.; Afonso, J.; Hardcastle, M. J.; Lacy, M.; Stevens, J. A.; Vardoulaki, E.
Affiliation:
AA(Observatório Nacional, Rua General José Cristino 77, 20921-400 Rio de Janeiro, RJ, Brazil; Observatório Astronómico de Lisboa, Faculdade de Ciências, Universidade de Lisboa, Tapada da Ajuda, P-1349-018 Lisbon, Portugal; Centro de Astronomia e Astrofísica da Universidade de Lisboa, Tapada da Ajuda, P-1349-018 Lisbon, Portugal; Subdepartment of Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 2DL, UK ), AB(Subdepartment of Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 2DL, UK; Department of Physics, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa), AC(Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth PO1 3FX, UK), AD(Subdepartment of Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 2DL, UK), AE(Observatório Astronómico de Lisboa, Faculdade de Ciências, Universidade de Lisboa, Tapada da Ajuda, P-1349-018 Lisbon, Portugal; Centro de Astronomia e Astrofísica da Universidade de Lisboa, Tapada da Ajuda, P-1349-018 Lisbon, Portugal), AF(Centre for Astrophysics Research, STRI, University of Hertfordshire, Hatfield AL10 9AB, UK), AG(National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA), AH(Centre for Astrophysics Research, STRI, University of Hertfordshire, Hatfield AL10 9AB, UK), AI(Subdepartment of Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 2DL, UK; Department of Physics, University of Crete, GR-71003 Heraklion, Greece)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 447, Issue 2, p.1184-1203 (MNRAS Homepage)
Publication Date:
02/2015
Origin:
OUP
Astronomy Keywords:
galaxies: active, galaxies: jets, galaxies: nuclei, quasars: general, infrared: galaxies, radio continuum: galaxies
Abstract Copyright:
2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stu2517
Bibliographic Code:
2015MNRAS.447.1184F

Abstract

Understanding the evolution of accretion activity is fundamental to our understanding of how galaxies form and evolve over the history of the Universe. We analyse a complete sample of 27 radio galaxies which includes both high-excitation galaxies (HEGs) and low-excitation galaxies (LEGs), spanning a mnrasrow redshift range of 0.9 < z < 1.1 and covering a factor of ˜1000 in radio luminosity. Using data from the Spitzer Space Telescope combined with ground-based optical and near-infrared imaging, we show that the host galaxies have masses in the range of 10.7 < log10(M/M&sun;) < 12.0 with HEGs and LEGs exhibiting no difference in their mass distributions. We also find that HEGs accrete at significantly higher rates than LEGs, with the HEG/LEG division lying at an Eddington ratio of lambda ˜ 0.04, which is in excellent agreement with theoretical predictions of where the accretion rate becomes radiatively inefficient, thus supporting the idea of HEGs and LEGs being powered by different modes of accretion. Our study also shows that at least up to L151 MHz ˜ 3 × 1027 W Hz-1 sr-1, HEGs and LEGs are indistinguishable in terms of their radio properties. From this result we infer that, at least for the lower radio luminosity range, another factor besides accretion rate must play an important role in the process of triggering jet activity.
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