---
_id: '11579'
abstract:
- lang: eng
  text: CR7 is the brightest z = 6.6 Ly α emitter (LAE) known to date, and spectroscopic
    follow-up by Sobral et al. suggests that CR7 might host Population (Pop) III stars.
    We examine this interpretation using cosmological hydrodynamical simulations.
    Several simulated galaxies show the same ‘Pop III wave’ pattern observed in CR7.
    However, to reproduce the extreme CR7 Ly α/He II1640 line luminosities (⁠Lα/HeII⁠)
    a top-heavy initial mass function and a massive ( ≳ 107 M⊙) Pop III burst with
    age ≲ 2 Myr are required. Assuming that the observed properties of Ly α and He II
    emission are typical for Pop III, we predict that in the COSMOS/UDS/SA22 fields,
    14 out of the 30 LAEs at z = 6.6 with Lα > 1043.3 erg s−1 should also host Pop
    III stars producing an observable LHeII≳1042.7ergs−1⁠. As an alternate explanation,
    we explore the possibility that CR7 is instead powered by accretion on to a direct
    collapse black hole. Our model predicts Lα, LHeII⁠, and X-ray luminosities that
    are in agreement with the observations. In any case, the observed properties of
    CR7 indicate that this galaxy is most likely powered by sources formed from pristine
    gas. We propose that further X-ray observations can distinguish between the two
    above scenarios.
acknowledgement: SS acknowledges support from the Netherlands Organization for Scientific
  research (NWO), VENI grant 639.041.233. RS acknowledges support from the European
  Research Council under the European Union (FP/2007-2013)/ERC grant agreement no.
  306476. DS acknowledges (i) financial support from the NWO through a Veni fellowship
  and (ii) funding from FCT through a FCT Investigator Starting Grant and Start-up
  Grant (IF/01154/2012/CP0189/CT0010) and from FCT grant PEstOE/FIS/UI2751/2014.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: A.
  full_name: Pallottini, A.
  last_name: Pallottini
- first_name: A.
  full_name: Ferrara, A.
  last_name: Ferrara
- first_name: F.
  full_name: Pacucci, F.
  last_name: Pacucci
- first_name: S.
  full_name: Gallerani, S.
  last_name: Gallerani
- first_name: S.
  full_name: Salvadori, S.
  last_name: Salvadori
- first_name: R.
  full_name: Schneider, R.
  last_name: Schneider
- first_name: D.
  full_name: Schaerer, D.
  last_name: Schaerer
- first_name: D.
  full_name: Sobral, D.
  last_name: Sobral
- first_name: Jorryt J
  full_name: Matthee, Jorryt J
  id: 7439a258-f3c0-11ec-9501-9df22fe06720
  last_name: Matthee
  orcid: 0000-0003-2871-127X
citation:
  ama: 'Pallottini A, Ferrara A, Pacucci F, et al. The brightest Lyα emitter: Pop
    III or black hole? <i>Monthly Notices of the Royal Astronomical Society</i>. 2015;453(3):2465-2470.
    doi:<a href="https://doi.org/10.1093/mnras/stv1795">10.1093/mnras/stv1795</a>'
  apa: 'Pallottini, A., Ferrara, A., Pacucci, F., Gallerani, S., Salvadori, S., Schneider,
    R., … Matthee, J. J. (2015). The brightest Lyα emitter: Pop III or black hole?
    <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press.
    <a href="https://doi.org/10.1093/mnras/stv1795">https://doi.org/10.1093/mnras/stv1795</a>'
  chicago: 'Pallottini, A., A. Ferrara, F. Pacucci, S. Gallerani, S. Salvadori, R.
    Schneider, D. Schaerer, D. Sobral, and Jorryt J Matthee. “The Brightest Lyα Emitter:
    Pop III or Black Hole?” <i>Monthly Notices of the Royal Astronomical Society</i>.
    Oxford University Press, 2015. <a href="https://doi.org/10.1093/mnras/stv1795">https://doi.org/10.1093/mnras/stv1795</a>.'
  ieee: 'A. Pallottini <i>et al.</i>, “The brightest Lyα emitter: Pop III or black
    hole?,” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 453, no.
    3. Oxford University Press, pp. 2465–2470, 2015.'
  ista: 'Pallottini A, Ferrara A, Pacucci F, Gallerani S, Salvadori S, Schneider R,
    Schaerer D, Sobral D, Matthee JJ. 2015. The brightest Lyα emitter: Pop III or
    black hole? Monthly Notices of the Royal Astronomical Society. 453(3), 2465–2470.'
  mla: 'Pallottini, A., et al. “The Brightest Lyα Emitter: Pop III or Black Hole?”
    <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 453, no. 3, Oxford
    University Press, 2015, pp. 2465–70, doi:<a href="https://doi.org/10.1093/mnras/stv1795">10.1093/mnras/stv1795</a>.'
  short: A. Pallottini, A. Ferrara, F. Pacucci, S. Gallerani, S. Salvadori, R. Schneider,
    D. Schaerer, D. Sobral, J.J. Matthee, Monthly Notices of the Royal Astronomical
    Society 453 (2015) 2465–2470.
date_created: 2022-07-14T08:58:36Z
date_published: 2015-11-01T00:00:00Z
date_updated: 2022-08-19T08:19:23Z
day: '01'
doi: 10.1093/mnras/stv1795
extern: '1'
external_id:
  arxiv:
  - '1506.07173'
intvolume: '       453'
issue: '3'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
- black hole physics
- 'stars: Population III'
- 'galaxies: high-redshift'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/1506.07173
month: '11'
oa: 1
oa_version: Preprint
page: 2465-2470
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  eissn:
  - 1365-2966
  issn:
  - 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'The brightest Lyα emitter: Pop III or black hole?'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 453
year: '2015'
...