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Ultraluminous X-ray sources: new distance indicators?

Różańska, A. and Bresler, K. and Beldycki, B. and Madej, J. and Adhikari, T. P. (2018) Ultraluminous X-ray sources: new distance indicators? Astronomy and Astrophysics, 612 . Art. No. L12. ISSN 0004-6361. https://resolver.caltech.edu/CaltechAUTHORS:20171006-100014623

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Abstract

Aims. In this paper we fit the NuSTAR and XMM-Newton data of three sources: NGC 7793 P13, NGC5907 ULX1, and Circinus ULX5. Methods. Our single model contains emission from a non-spherical system: a neutron star plus an accretion disk directed towards the observer. Results. We obtained a very good fit with the reduced χ2 per degree of freedom equal to 1.08 for P13, 1.01 for ULX1, and 1.14 for ULX5. The normalization of our model constrains the distance to the source. The resulting distances are D = 3.41_(−0.10)^(+0.11), 6.55_(−0.81)^(+0.69), and 2.60_(−0.03)^(+0.05) Mpc for P13, ULX1, and ULX5 respectively. The distances to P13 and ULX5 are in perfect agreement with previous distance measurements to their host galaxies. Conclusions. Our results confirm that P13, ULX1, and ULX5 may contain central hot neutron stars. When the outgoing emission is computed by integration over the emitting surface and successfully fitted to the data, then the resulting model normalization is the direct distance indicator.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1051/0004-6361/201832864DOIArticle
http://arxiv.org/abs/1710.02024arXivDiscussion Paper
ORCID:
AuthorORCID
Różańska, A.0000-0002-5275-4096
Alternate Title:Ultra Luminous X-ray sources - new distance indicators?
Additional Information:© 2018 ESO. Article published by EDP Sciences. Received 20 February 2018; Accepted 16 April 2018; Published online 10 May 2018. This research was supported by Polish National Science Center grants No. 2015/17/B/ST9/03422, 2015/18/M/ST9/00541, and 2016/21/N/ST9/03311. This research has made use of data obtained with NuSTAR, a project led by Caltech, funded by NASA, and managed by NASA/JPL, and has utilized the NUSTARDAS software package, jointly developed by ASDC (Italy) and Caltech (USA). This work has also made use of data obtained with XMM-Newton directly funded by ESA Member States.
Group:NuSTAR
Subject Keywords:accretion, accretion disks – stars: neutron – X-rays: general
Record Number:CaltechAUTHORS:20171006-100014623
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20171006-100014623
Official Citation:Ultraluminous X-ray sources: new distance indicators? A. Różańska, K. Bresler, B. Bełdycki, J. Madej and T. P. Adhikari A&A, 612 (2018) L12 DOI: https://doi.org/10.1051/0004-6361/201832864
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:82155
Collection:CaltechAUTHORS
Deposited By: Joy Painter
Deposited On:06 Oct 2017 17:15
Last Modified:03 Oct 2019 18:51

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