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A NuSTAR observation of the fast symbiotic nova V745 Sco in outburst

Orio, M. and Rana, V. and Page, K. L. and Sokoloski, J. and Harrison, F. (2015) A NuSTAR observation of the fast symbiotic nova V745 Sco in outburst. Monthly Notices of the Royal Astronomical Society, 448 (1). L35-L39. ISSN 0035-8711. doi:10.1093/mnrasl/slu195.

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The fast recurrent nova V745 Sco was observed in the 3–79 keV X-rays band with NuSTAR 10 d after the optical discovery. The measured X-ray emission is consistent with a collisionally ionized optically thin plasma at temperature of about 2.7 keV. A prominent iron line observed at 6.7 keV does not require enhanced iron in the ejecta. We attribute the X-ray flux to shocked circumstellar material. No X-ray emission was observed at energies above 20 keV, and the flux in the 3–20 keV range was about 1.6 × 10^(−11) erg cm^(−2) s^(−1). The emission measure indicates an average electron density of the order of 10^7 cm^(−2). The X-ray flux in the 0.3–10 keV band almost simultaneously measured with Swift was about 40 times larger, mainly due to the luminous central supersoft source emitting at energy below 1 keV. The fact that the NuSTAR spectrum cannot be fitted with a power law, and the lack of hard X-ray emission, allow us to rule out Comptonized gamma-rays, and to place an upper limit of the order of 10^(−11) erg cm^(−2) s^(−1) on the gamma-ray flux of the nova on the tenth day of the outburst.

Item Type:Article
Related URLs:
URLURL TypeDescription
Rana, V.0000-0003-1703-8796
Page, K. L.0000-0001-5624-2613
Harrison, F.0000-0003-2992-8024
Additional Information:© 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2014 December 3. Received 2014 November 26; in original form 2014 October 17. First published online January 9, 2015. We wish to acknowledge the support of the following awards and funding agencies: MO of ASI (Italian Space Agency) through an INAF-ASI grant, JLS of the NSF award AST-1211778, and KLP of the UK Space Agency funding the UK Swift Science Data Centre.
Group:NuSTAR, Space Radiation Laboratory
Funding AgencyGrant Number
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
United Kingdom Space Agency (UKSA)UNSPECIFIED
Subject Keywords:binaries: close –white dwarfs –X-rays: stars
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2015-68
Issue or Number:1
Record Number:CaltechAUTHORS:20150603-103349166
Persistent URL:
Official Citation:M. Orio, V. Rana, K. L. Page, J. Sokoloski, and F. Harrison A NuSTAR observation of the fast symbiotic nova V745 Sco in outburst MNRAS (March 21, 2015) Vol. 448 L35-L39 doi:10.1093/mnrasl/slu195 First published online January 9, 2015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57975
Deposited By: Tony Diaz
Deposited On:03 Jun 2015 17:43
Last Modified:10 Nov 2021 21:57

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