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High-energy X-Rays from J174545.5-285829, the Cannonball: A Candidate Pulsar Wind Nebula Associated with Sgr A East

Nynka, Melania and Hailey, Charles J. and Mori, Kaya and Baganoff, Frederick K. and Bauer, Franz E. and Boggs, Steven E. and Craig, William W. and Christensen, Finn E. and Gotthelf, Eric V. and Harrison, Fiona A. and Hong, Jaesub and Perez, Kerstin M. and Stern, Daniel and Zhang, Shou and Zhang, William W. (2013) High-energy X-Rays from J174545.5-285829, the Cannonball: A Candidate Pulsar Wind Nebula Associated with Sgr A East. Astrophysical Journal Letters, 778 (2). Art. No. L31. ISSN 2041-8205. doi:10.1088/2041-8205/778/2/L31.

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We report the unambiguous detection of non-thermal X-ray emission up to 30 keV from the Cannonball, a few-arcsecond long diffuse X-ray feature near the Galactic Center, using the NuSTAR X-ray observatory. The Cannonball is a high-velocity (v_(proj) ~ 500 km s^(–1)) pulsar candidate with a cometary pulsar wind nebula (PWN) located ~2' north-east from Sgr A^*, just outside the radio shell of the supernova remnant Sagittarius A (Sgr A) East. Its non-thermal X-ray spectrum, measured up to 30 keV, is well characterized by a Γ ~ 1.6 power law, typical of a PWN, and has an X-ray luminosity of L(3-30 keV) = 1.3 × 10^(34) erg s^(–1). The spectral and spatial results derived from X-ray and radio data strongly suggest a runaway neutron star born in the Sgr A East supernova event. We do not find any pulsed signal from the Cannonball. The NuSTAR observations allow us to deduce the PWN magnetic field and show that it is consistent with the lower limit obtained from radio observations.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Nynka, Melania0000-0002-3310-1946
Mori, Kaya0000-0002-9709-5389
Bauer, Franz E.0000-0002-8686-8737
Boggs, Steven E.0000-0001-9567-4224
Christensen, Finn E.0000-0001-5679-1946
Gotthelf, Eric V.0000-0003-3847-3957
Harrison, Fiona A.0000-0003-2992-8024
Perez, Kerstin M.0000-0002-6404-4737
Stern, Daniel0000-0003-2686-9241
Zhang, William W.0000-0002-1426-9698
Additional Information:© 2013 American Astronomical Society. Received 2013 September 25; accepted 2013 October 22; published 2013 November 13. This work was supported under NASA contract No. NNG08FD60C, and made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We thank the NuSTAR Operations, Software and Calibration teams for support with the execution and analysis of these observations. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). The authors wish to thank Jules Halpern for useful discussions.
Group:NuSTAR, Space Radiation Laboratory
Funding AgencyGrant Number
Subject Keywords:Galaxy: center; ISM: individual objects (Sagittarius A, Sagittarius A East); ISM: supernova remnants; stars: neutron; X-rays: individual (Cannonball)
Issue or Number:2
Record Number:CaltechAUTHORS:20140107-142025993
Persistent URL:
Official Citation: High-energy X-Rays from J174545.5-285829, the Cannonball: A Candidate Pulsar Wind Nebula Associated with Sgr A East Melania Nynka et al. 2013 ApJ 778 L31
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43251
Deposited By: Ruth Sustaita
Deposited On:07 Jan 2014 23:23
Last Modified:10 Nov 2021 16:35

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