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G359.97-0.038: A Hard X-Ray Filament Associated with a Supernova Shell-Molecular Cloud Interaction

Nynka, Melania and Hailey, Charles J. and Zhang, Shuo and Morris, Mark R. and Zhao, Jun-Hui and Goss, Miller and Bauer, Franz E. and Boggs, Stephen E. and Craig, William W. and Christensen, Finn E. and Gotthelf, Eric V. and Harrison, Fiona A. and Mori, Kaya and Perez, Kerstin M. and Stern, Daniel and Zhang, William W. (2015) G359.97-0.038: A Hard X-Ray Filament Associated with a Supernova Shell-Molecular Cloud Interaction. Astrophysical Journal, 800 (2). Art. No. 119. ISSN 0004-637X. doi:10.1088/0004-637X/800/2/119.

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We present the first high-energy X-ray (>10 keV) observations of the non-thermal filament G359.97-0.038 using the Nuclear Spectroscopic Telescope Array (NuSTAR). This filament is one of approximately 20 X-ray filaments of unknown origin located in the central 20 pc region in the Galactic Center near Sgr A^*. Its NuSTAR and Chandra broadband spectrum is characterized by a single power law with Γ = 1.3 ± 0.3 that extends from 2 to 50 keV, with an unabsorbed luminosity of 1.3 × 10^(33) erg s^(–1) (d/8 kpc)^2 in the 2-8 keV band. Despite possessing a cometary X-ray morphology that is typical of a pulsar wind nebula (PWN) in high-resolution Chandra imaging, our spatially resolved Chandra spectral analysis found no significant spectral softening along the filament as would be expected from particle synchrotron cooling. Coincident radio emission is detected using the Very Large Array at 5.5 and 8.3 GHz. We examine and subsequently discard a PWN or magnetic flux tube as the origin of G359.97-0.038. We use broadband spectral characteristics and a morphological analysis to show that G359.97-0.038 is likely an interaction site between the shell of Sgr A East and an adjacent molecular cloud. This is supported by CS molecular line spectroscopy and the presence of an OH maser.

Item Type:Article
Related URLs:
URLURL TypeDescription
Nynka, Melania0000-0002-3310-1946
Zhang, Shuo0000-0002-2967-790X
Morris, Mark R.0000-0002-6753-2066
Zhao, Jun-Hui0000-0002-1317-3328
Bauer, Franz E.0000-0002-8686-8737
Boggs, Stephen 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
Mori, Kaya0000-0002-9709-5389
Perez, Kerstin M.0000-0002-6404-4737
Stern, Daniel0000-0003-2686-9241
Zhang, William W.0000-0002-1426-9698
Additional Information:© 2015 American Astronomical Society. Received 2014 September 29; accepted 2014 December 9; published 2015 February 18. 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. F.E.B. acknowledges support from CONICYT-Chile (Basal-CATA PFB-06/2007, FONDECYT 1141218, “EMBIGGEN” Anillo ACT1101), and Project IC120009 “Millennium Institute of Astrophysics (MAS)” funded by the Iniciativa Científica Milenio del Ministerio de Economía, Fomento y Turismo. 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).
Group:NuSTAR, Space Radiation Laboratory
Funding AgencyGrant Number
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1141218
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)EMBIGGEN Anillo ACT1101
Iniciativa Científica Milenio del Ministerio de Economía, Fomento y TurismoProject IC120009 “Millennium Institute of Astrophysics (MAS)”
Subject Keywords:Galaxy: center
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2015-78
Issue or Number:2
Record Number:CaltechAUTHORS:20150323-152801857
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Official Citation:G359.97-0.038: A Hard X-Ray Filament Associated with a Supernova Shell-Molecular Cloud Interaction Melania Nynka et al. 2015 ApJ 800 119
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55993
Deposited By: Ruth Sustaita
Deposited On:24 Mar 2015 17:00
Last Modified:10 Nov 2021 20:53

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