High-z quasars in the R h = ct universe

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

One cannot understand the early appearance of 109 M supermassive black holes without invoking anomalously high accretion rates or the creation of exotically massive seeds, neither of which is seen in the local universe. Recent observations have compounded this problem by demonstrating that most, if not all, of the high-z quasars appear to be accreting at the Eddington limit. In the context of ΛCDM, the only viable alternative now appears to be the assemblage of supermassive black holes via mergers, as long as the seeds started forming at redshifts >40, but ceased being created by z ∼ 20-30. In this paper, we show that, whereas the high-z quasars may be difficult to explain within the framework of the standard model, they can instead be interpreted much more sensibly in the context of the R h = ct universe. In this cosmology, 5-20 M seeds produced after the onset of re-ionization (at z ≲ 15) could have easily grown to M ≳ 109 M by z ≳ 6, merely by accreting at the standard Eddington rate.

Original languageEnglish (US)
Article number72
JournalAstrophysical Journal
Volume764
Issue number1
DOIs
StatePublished - Feb 10 2013

Fingerprint

quasars
seeds
universe
seed
cosmology
merger
ionization
accretion
rate

Keywords

  • cosmology: observations
  • cosmology: theory
  • dark ages, reionization, first stars
  • early universe
  • large-scale structure of universe
  • quasars: general

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

High-z quasars in the R h = ct universe. / Melia, Fulvio.

In: Astrophysical Journal, Vol. 764, No. 1, 72, 10.02.2013.

Research output: Contribution to journalArticle

@article{7402f982318a4ca895a0d4434968620a,
title = "High-z quasars in the R h = ct universe",
abstract = "One cannot understand the early appearance of 109 M ⊙ supermassive black holes without invoking anomalously high accretion rates or the creation of exotically massive seeds, neither of which is seen in the local universe. Recent observations have compounded this problem by demonstrating that most, if not all, of the high-z quasars appear to be accreting at the Eddington limit. In the context of ΛCDM, the only viable alternative now appears to be the assemblage of supermassive black holes via mergers, as long as the seeds started forming at redshifts >40, but ceased being created by z ∼ 20-30. In this paper, we show that, whereas the high-z quasars may be difficult to explain within the framework of the standard model, they can instead be interpreted much more sensibly in the context of the R h = ct universe. In this cosmology, 5-20 M⊙ seeds produced after the onset of re-ionization (at z ≲ 15) could have easily grown to M ≳ 109 M⊙ by z ≳ 6, merely by accreting at the standard Eddington rate.",
keywords = "cosmology: observations, cosmology: theory, dark ages, reionization, first stars, early universe, large-scale structure of universe, quasars: general",
author = "Fulvio Melia",
year = "2013",
month = "2",
day = "10",
doi = "10.1088/0004-637X/764/1/72",
language = "English (US)",
volume = "764",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - High-z quasars in the R h = ct universe

AU - Melia, Fulvio

PY - 2013/2/10

Y1 - 2013/2/10

N2 - One cannot understand the early appearance of 109 M ⊙ supermassive black holes without invoking anomalously high accretion rates or the creation of exotically massive seeds, neither of which is seen in the local universe. Recent observations have compounded this problem by demonstrating that most, if not all, of the high-z quasars appear to be accreting at the Eddington limit. In the context of ΛCDM, the only viable alternative now appears to be the assemblage of supermassive black holes via mergers, as long as the seeds started forming at redshifts >40, but ceased being created by z ∼ 20-30. In this paper, we show that, whereas the high-z quasars may be difficult to explain within the framework of the standard model, they can instead be interpreted much more sensibly in the context of the R h = ct universe. In this cosmology, 5-20 M⊙ seeds produced after the onset of re-ionization (at z ≲ 15) could have easily grown to M ≳ 109 M⊙ by z ≳ 6, merely by accreting at the standard Eddington rate.

AB - One cannot understand the early appearance of 109 M ⊙ supermassive black holes without invoking anomalously high accretion rates or the creation of exotically massive seeds, neither of which is seen in the local universe. Recent observations have compounded this problem by demonstrating that most, if not all, of the high-z quasars appear to be accreting at the Eddington limit. In the context of ΛCDM, the only viable alternative now appears to be the assemblage of supermassive black holes via mergers, as long as the seeds started forming at redshifts >40, but ceased being created by z ∼ 20-30. In this paper, we show that, whereas the high-z quasars may be difficult to explain within the framework of the standard model, they can instead be interpreted much more sensibly in the context of the R h = ct universe. In this cosmology, 5-20 M⊙ seeds produced after the onset of re-ionization (at z ≲ 15) could have easily grown to M ≳ 109 M⊙ by z ≳ 6, merely by accreting at the standard Eddington rate.

KW - cosmology: observations

KW - cosmology: theory

KW - dark ages, reionization, first stars

KW - early universe

KW - large-scale structure of universe

KW - quasars: general

UR - http://www.scopus.com/inward/record.url?scp=84873972831&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84873972831&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/764/1/72

DO - 10.1088/0004-637X/764/1/72

M3 - Article

AN - SCOPUS:84873972831

VL - 764

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 72

ER -