Show simple item record

dc.contributor.authorMelia, Fulvio
dc.date.accessioned2018-10-24T23:49:57Z
dc.date.available2018-10-24T23:49:57Z
dc.date.issued2018-07-24
dc.identifier.citationMelia, F. (2018). J1342+ 0928 supports the timeline in the Rh= ct cosmology. Astronomy & Astrophysics, 615, A113; DOI: https://doi.org/10.1051/0004-6361/201832752en_US
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.doi10.1051/0004-6361/201832752
dc.identifier.urihttp://hdl.handle.net/10150/630548
dc.description.abstractAims. The discovery of quasar J1342+0928 (z = 7.54) reinforces the time compression problem associated with the premature formation of structure in A cold dark matter (ACDM). Adopting the Planck parameters, we see this quasar barely 690 Myr after the big bang, no more than several hundred Myr after the transition from Pop III to Pop II star formation. Yet conventional astrophysics would tell us that a 10 M-circle dot seed, created by a Pop II/III supernova, should have taken at least 820 Myr to grow via Eddington-limited accretion. This failure by ACDM constitutes one of its most serious challenges, requiring exotic "fixes", such as anomalously high accretion rates, or the creation of enormously massive (similar to 10(5) M-circle dot) seeds, neither of which is ever seen in the local Universe, or anywhere else for that matter. Indeed, to emphasize this point, J1342+0928 is seen to be accreting at about the Eddington rate, negating any attempt at explaining its unusually high mass due to such exotic means. In this paper, we aim to demonstrate that the discovery of this quasar instead strongly confirms the cosmological timeline predicted by the R-h = Ct Universe. Methods. We assume conventional Eddington-limited accretion and the time versus redshift relation in this model to calculate when a seed needed to start growing as a function of its mass in order to reach the observed mass of J1342+0928 at z = 7.54. Results. Contrary to the tension created in the standard model by the appearance of this massive quasar so early in its history, we find that in the R-h = Ct cosmology, a 10 M-circle dot seed at z similar to 15 (the start of the Epoch of Reionization at t similar to 878 Myr) would have easily grown into an 8 x 10(8) M-circle dot black hole at z = 7.54 (t similar to 1.65 Gyr) via conventional Eddington-limited accretion.en_US
dc.description.sponsorshipAmherst Collegeen_US
dc.language.isoenen_US
dc.publisherEDP SCIENCES S Aen_US
dc.relation.urlhttps://www.aanda.org/10.1051/0004-6361/201832752en_US
dc.rights© ESO 2018.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectcosmology: theoryen_US
dc.subjectcosmology: observationsen_US
dc.subjectearly Universeen_US
dc.subjectgalaxies: activeen_US
dc.subjectquasars: supermassive black holesen_US
dc.titleJ1342+0928 supports the timeline in the R-h = ct cosmologyen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Dept Phys, Appl Math Programen_US
dc.contributor.departmentUniv Arizona, Dept Astronen_US
dc.identifier.journalASTRONOMY & ASTROPHYSICSen_US
dc.description.noteOpen access journal.en_US
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_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleAstronomy & Astrophysics
dc.source.volume615
dc.source.beginpageA113
refterms.dateFOA2018-10-24T23:49:58Z


Files in this item

Thumbnail
Name:
aa32752-18.pdf
Size:
200.5Kb
Format:
PDF
Description:
Final Published version

This item appears in the following Collection(s)

Show simple item record