# The AGN Hubble Diagram and its implications for cosmology

http://hdl.handle.net/10150/614769
Title:
The AGN Hubble Diagram and its implications for cosmology
Author:
Melia, F.
Issue Date:
2015-08-21
Publisher:
Springer Verlag
Citation:
The AGN Hubble Diagram and its implications for cosmology 2015, 359 (1) Astrophysics and Space Science
Journal:
Astrophysics and Space Science
Rights:
Collection Information:
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
Abstract:
We use a recently proposed luminosity distance measure for relatively nearby active galactic nuclei (AGNs) to test the predicted expansion of the Universe in the $R_{\rm h}=ct$ and $\Lambda$CDM cosmologies. This comparative study is particularly relevant to the question of whether or not the Universe underwent a transition from decelerated to accelerated expansion, which is believed to have occurred---on the basis of Type Ia SN studies---within the redshift range ($0\lesssim z\lesssim 1.3$) that will eventually be sampled by these objects. We find that the AGN Hubble Diagram constructed from currently available sources does not support the existence of such a transition. While the scatter in the AGN data is still too large for any firm conclusions to be drawn, the results reported here nonetheless somewhat strengthen similar results of comparative analyses using other types of source. We show that the Akaike, Kullback, and Bayes Information Criteria all consistently yield a likelihood of $\sim 84-96\%$ that $R_{\rm h}=ct$ is closer to the true" cosmology than $\Lambda$CDM is, though neither model adequately accounts for the data, suggesting an unnaccounted-for source of scatter.
ISSN:
0004-640X; 1572-946X
DOI:
10.1007/s10509-015-2483-4
Version:
Final accepted manuscript

# Full metadata record

DC FieldValue Language
dc.contributor.authorMelia, F.en
dc.date.accessioned2016-06-25T01:00:32Z-
dc.date.available2016-06-25T01:00:32Z-
dc.date.issued2015-08-21-
dc.identifier.citationThe AGN Hubble Diagram and its implications for cosmology 2015, 359 (1) Astrophysics and Space Scienceen
dc.identifier.issn0004-640X-
dc.identifier.issn1572-946X-
dc.identifier.doi10.1007/s10509-015-2483-4-
dc.identifier.urihttp://hdl.handle.net/10150/614769-
dc.description.abstractWe use a recently proposed luminosity distance measure for relatively nearby active galactic nuclei (AGNs) to test the predicted expansion of the Universe in the $R_{\rm h}=ct$ and $\Lambda$CDM cosmologies. This comparative study is particularly relevant to the question of whether or not the Universe underwent a transition from decelerated to accelerated expansion, which is believed to have occurred---on the basis of Type Ia SN studies---within the redshift range ($0\lesssim z\lesssim 1.3$) that will eventually be sampled by these objects. We find that the AGN Hubble Diagram constructed from currently available sources does not support the existence of such a transition. While the scatter in the AGN data is still too large for any firm conclusions to be drawn, the results reported here nonetheless somewhat strengthen similar results of comparative analyses using other types of source. We show that the Akaike, Kullback, and Bayes Information Criteria all consistently yield a likelihood of $\sim 84-96\%$ that $R_{\rm h}=ct$ is closer to the true" cosmology than $\Lambda$CDM is, though neither model adequately accounts for the data, suggesting an unnaccounted-for source of scatter.en
dc.language.isoenen
dc.publisherSpringer Verlagen
dc.titleThe AGN Hubble Diagram and its implications for cosmologyen
dc.typeArticleen
dc.identifier.journalAstrophysics and Space Scienceen
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal accepted manuscripten
All Items in UA Campus Repository are protected by copyright, with all rights reserved, unless otherwise indicated.
• # Files 1

• ms.pdf
143KB

Final Accepted Manuscript