John Regan
Positive or negative? The impact of X-ray feedback on the formation of direct collapse black hole seeds
Regan, John; Johansson, Peter; Wise, John
Authors
Peter Johansson
John Wise
Abstract
A nearby source of Lyman–Werner (LW) photons is thought to be a central component in dissociating H2 and allowing for the formation of a direct collapse black hole seed. Nearby sources are also expected to produce copious amounts of hydrogen ionizing photons and X-ray photons. We study here the feedback effects of the X-ray photons by including a spectrum due to high-mass X-ray binaries on top of a galaxy with a stellar spectrum. We explicitly trace photon packages emerging from the nearby source and track the radiative and chemical effects of the multifrequency source (Ephoton = 0.76 eV → 7500 eV). We find that X-rays have a strongly negative feedback effect, compared to a stellar only source, when the radiative source is placed at a separation greater than ≳ 1 kpc. The X-rays heat the low and medium density gas in the envelope surrounding the collapsing halo suppressing the mass inflow. The result is a smaller enclosed mass compared to the stellar only case. However, for separations of ≲ 1 kpc, the feedback effects of the X-rays becomes somewhat neutral. The enhanced LW intensity at close separations dissociates more H2 and this gas is heated due to stellar photons alone, the addition of X-rays is then not significant. This distance dependence of X-ray feedback suggests that a Goldilocks zone exists close to a forming galaxy where X-ray photons have a much smaller negative feedback effect and ideal conditions exist for creating massive black hole seeds.
Citation
Regan, J., Johansson, P., & Wise, J. (2016). Positive or negative? The impact of X-ray feedback on the formation of direct collapse black hole seeds. Monthly Notices of the Royal Astronomical Society, 461(1), 111-125. https://doi.org/10.1093/mnras/stw1307
Journal Article Type | Article |
---|---|
Acceptance Date | May 27, 2016 |
Online Publication Date | Jun 15, 2016 |
Publication Date | Sep 1, 2016 |
Deposit Date | Jun 29, 2016 |
Publicly Available Date | Jul 28, 2016 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 461 |
Issue | 1 |
Pages | 111-125 |
DOI | https://doi.org/10.1093/mnras/stw1307 |
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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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