NuSTAR Hard X-Ray of the Galactic Center Region. I. Hard X-Ray Morphology and Spectroscopy of the Diffuse Emission

Mori, Kaya; Hailey, Charles J.; Krivonos, Roman; Hong, Jaesub; Ponti, Gabriele; Bauer, Franz; Perez, Kerstin; Nynka, Melania; Zhang, Shuo; Tomsick, John A.; Alexander, David M.; Baganoff, Frederick K.; Barret, Didier; Barrière, Nicolas; Boggs, Steven E.; Canipe, Alicia M.; Christensen, Finn E.; Craig, William W.; Forster, Karl; Giommi, Paolo; Grefenstette, Brian W.; Grindlay, Jonathan E.; Harrison, Fiona A.; Hornstrup, Allan; Kitaguchi, Takao; Koglin, Jason E.; Luu, Vy; Madsen, Kristen K.; Mao, Peter H.; Miyasaka, Hiromasa; Perri, Matteo; Pivovaroff, Michael J.; Puccetti, Simonetta; Rana, Vikram; Stern, Daniel; Westergaard, Niels J.; Zhang, William W.; Zoglauer, Andreas

doi:10.1088/0004-637X/814/2/94

Title: NuSTAR Hard X-Ray of the Galactic Center Region. I. Hard X-Ray Morphology and Spectroscopy of the Diffuse Emission

Journal Article · Thu Nov 19 00:00:00 EST 2015 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.1088/0004-637X/814/2/94· OSTI ID:1480407

^[1]; Hailey, Charles J. ^[1];

^[2]; Hong, Jaesub ^[3]; Ponti, Gabriele ^[4];

^[5]; Perez, Kerstin ^[6]; Nynka, Melania ^[1]; Zhang, Shuo ^[1];

^[7];

^[8]; Baganoff, Frederick K. ^[9];

^[10]; Barrière, Nicolas ^[7]; Boggs, Steven E. ^[7]; Canipe, Alicia M. ^[1];

^[11]; Craig, William W. ^[12]; Forster, Karl ^[13]; Giommi, Paolo ^[14] more »

Columbia Univ., New York, NY (United States)
Univ. of California, Berkeley, CA (United States); Russian Academy of Sciences, Moscow (Russia)
Harvard Smithsonian Center for Astrophysics, Cambridge, MA (United States)
Max-Planck-Institut f. extraterrestrische Physik, Garching (Germany)
Pontificia Univ. Catolica de Chile, Santiago (Chile); Millennium Institute of Astrophysics, Santiago (Chile); Space Science Institute, Boulder, CO (United States)
Columbia Univ., New York, NY (United States); Harvard College, Haverford, PA (United States)
Univ. of California, Berkeley, CA (United States)
Durham Univ., Durham (United Kingdom)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Univ. de Toulouse, Toulouse (France); CNRS, Toulouse Cedex (France)
Technical Univ. of Denmark, Lyngby (Denmark)
Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
California Inst. of Technology (CalTech), Pasadena, CA (United States)
ASI Science Data Center, Roma (Italy)
Hiroshima Univ., Hiroshima (Japan)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
ASI Science Data Center, Roma (Italy); INAF - Astronomico di Roma, Monteporzio (Italy)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)

Here, we present the first sub-arcminute images of the Galactic Center above 10 keV, obtained with NuSTAR. NuSTAR resolves the hard X-ray source IGR J17456–2901 into non-thermal X-ray filaments, molecular clouds, point sources, and a previously unknown central component of hard X-ray emission (CHXE). NuSTAR detects four non-thermal X-ray filaments, extending the detection of their power-law spectra with Γ ~ 1.3–2.3 up to ~50 keV. A morphological and spectral study of the filaments suggests that their origin may be heterogeneous, where previous studies suggested a common origin in young pulsar wind nebulae (PWNe). NuSTAR detects non-thermal X-ray continuum emission spatially correlated with the 6.4 keV Fe Kα fluorescence line emission associated with two Sgr A molecular clouds: MC1 and the Bridge. Broadband X-ray spectral analysis with a Monte-Carlo based X-ray reflection model self-consistently determined their intrinsic column density (~10²³ cm^–2), primary X-ray spectra (power-laws with Γ ~ 2) and set a lower limit of the X-ray luminosity of Sgr A* flare illuminating the Sgr A clouds to L_X ≳ 10³⁸ erg s–1. Above ~20 keV, hard X-ray emission in the central 10 pc region around Sgr A* consists of the candidate PWN G359.95–0.04 and the CHXE, possibly resulting from an unresolved population of massive CVs with white dwarf masses M_WD ~ 0.9 M_⊙. Spectral energy distribution analysis suggests that G359.95–0.04 is likely the hard X-ray counterpart of the ultra-high gamma-ray source HESS J1745–290, strongly favoring a leptonic origin of the GC TeV emission.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1480407

Report Number(s):: LLNL-JRNL-746966; 931727

Journal Information:: The Astrophysical Journal (Online), Vol. 814, Issue 2; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 37 works

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Gamma-Ray And X-Ray Emission From The Galactic Centre: Hints On The Nuclear Star Cluster Formation History Arca-Sedda, Manuel; Kocsis, Bence; Brandt, Timothy Zenodo https://doi.org/10.5281/zenodo.1438361	text	January 2018
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