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Reply to “Comment on ‘Understanding the γ -ray emission from the globular cluster 47 Tuc: Evidence for dark matter?”’

Brown, Anthony M.; Lacroix, Thomas; Lloyd, Sheridan; Bœhm, Céline; Chadwick, Paula

Reply to “Comment on ‘Understanding the γ -ray emission from the globular cluster 47 Tuc: Evidence for dark matter?”’ Thumbnail


Authors

Thomas Lacroix

Céline Bœhm



Abstract

Analyzing nine years of Fermi-LAT observations, we recently studied the spectral properties of the prominent globular cluster [Phys. Rev. 98, 041301 (2018)]. In particular, we investigated several models to explain the observed gamma-ray emission, ranging from millisecond pulsars (MSPs) to dark matter (DM), with the motivation for the latter model driven by recent evidence that 47 Tuc harbors an intermediate-mass black hole [B. Kiziltan et al., Nature (London) 542, 203 (2017)]. This investigation found evidence that the observed gamma-ray emission from 47 Tuc is due to two source populations of MSPs and DM. In preceding Comment [Phys. Rev. D 100, 068301 (2019)], Bartels and Edwards comment that this evidence is an artifact of the MSP spectra used in our paper. Here, we reply to this comment and argue that (i) Bartels and Edwards do not give due consideration to a very important implication of their result and (ii) there is tension between our MSP fit and their MSP fit when taking uncertainties into consideration. As such, we still conclude there is evidence for a DM component which motivates a deeper radio study of the prominent globular cluster 47 Tuc.

Citation

Brown, A. M., Lacroix, T., Lloyd, S., Bœhm, C., & Chadwick, P. (2019). Reply to “Comment on ‘Understanding the γ -ray emission from the globular cluster 47 Tuc: Evidence for dark matter?”’. Physical Review D, 100(6), Article 068302. https://doi.org/10.1103/physrevd.100.068302

Journal Article Type Article
Online Publication Date Sep 25, 2019
Publication Date Sep 25, 2019
Deposit Date Oct 16, 2019
Publicly Available Date Oct 16, 2019
Journal Physical Review D
Print ISSN 2470-0010
Electronic ISSN 2470-0029
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 100
Issue 6
Article Number 068302
DOI https://doi.org/10.1103/physrevd.100.068302

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Copyright Statement
Reprinted with permission from the American Physical Society: Brown, Anthony M., Lacroix, Thomas, Lloyd, Sheridan, Bœhm, Céline & Chadwick, Paula (2019). Reply to “Comment on ‘Understanding the γ -ray emission from the globular cluster 47 Tuc: Evidence for dark matter?”’. Physical Review D 100(6): 068302 © 2019 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.







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