Deep X-Ray Imaging of the Central 20 Parsecs of the Galaxy with Chandra

Mark Morris, Fred Baganoff, Michael Muno, Christian Howard, Yoshitomo Maeda, Eric Feigelson, Marshall Bautz, William Nielsen Brandt, George Chartas, Gordon Garmire, Leisa K. Townsley

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A deep observation toward the Galactic center with the Chandra X-Ray Observatory revealed a number of extended features, in addition to Sgr A* and SgrA East. Here, we focus on two curious, extended X-ray structures: large-scale (∼10 pc) bipolar lobes centered on Sgr A* and a bright cometary source located 0.3 pc from Sgr A*, CXOGC J174539.7-290020. The bipolar lobes consist of a number of emission clumps oriented along a line perpendicular to the Galactic plane, suggesting that a series of ejections has taken place on characteristic time scales of hundreds to thousands of years. The clumps are embedded in a low-intensity, edge-brightened lobe which is most evident in a flux ratio map. At two locations along the lobe, nonthermal linear features are present, suggesting that relativistic electrons may be impinging on the compressed, magnetic wall of this structure. The cometary X-ray source has no counterpart at other wavelengths; its orientation is consistent with a high-velocity neutron star ejected from the grouping of stars at IRS13, but there are problems with that hypothesis, and other models warrant consideration.

Original languageEnglish (US)
Pages (from-to)167-172
Number of pages6
JournalAstronomische Nachrichten
Volume324
Issue numberSUPPL.1
DOIs
StatePublished - Sep 1 2003

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lobes
galaxies
clumps
x rays
observatory
ejection
neutron stars
wavelength
timescale
electron
observatories
stars
wavelengths
electrons

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Morris, Mark ; Baganoff, Fred ; Muno, Michael ; Howard, Christian ; Maeda, Yoshitomo ; Feigelson, Eric ; Bautz, Marshall ; Brandt, William Nielsen ; Chartas, George ; Garmire, Gordon ; Townsley, Leisa K. / Deep X-Ray Imaging of the Central 20 Parsecs of the Galaxy with Chandra. In: Astronomische Nachrichten. 2003 ; Vol. 324, No. SUPPL.1. pp. 167-172.
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Morris, M, Baganoff, F, Muno, M, Howard, C, Maeda, Y, Feigelson, E, Bautz, M, Brandt, WN, Chartas, G, Garmire, G & Townsley, LK 2003, 'Deep X-Ray Imaging of the Central 20 Parsecs of the Galaxy with Chandra', Astronomische Nachrichten, vol. 324, no. SUPPL.1, pp. 167-172. https://doi.org/10.1002/asna.200385110

Deep X-Ray Imaging of the Central 20 Parsecs of the Galaxy with Chandra. / Morris, Mark; Baganoff, Fred; Muno, Michael; Howard, Christian; Maeda, Yoshitomo; Feigelson, Eric; Bautz, Marshall; Brandt, William Nielsen; Chartas, George; Garmire, Gordon; Townsley, Leisa K.

In: Astronomische Nachrichten, Vol. 324, No. SUPPL.1, 01.09.2003, p. 167-172.

Research output: Contribution to journalArticle

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AU - Baganoff, Fred

AU - Muno, Michael

AU - Howard, Christian

AU - Maeda, Yoshitomo

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AU - Bautz, Marshall

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AU - Chartas, George

AU - Garmire, Gordon

AU - Townsley, Leisa K.

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AB - A deep observation toward the Galactic center with the Chandra X-Ray Observatory revealed a number of extended features, in addition to Sgr A* and SgrA East. Here, we focus on two curious, extended X-ray structures: large-scale (∼10 pc) bipolar lobes centered on Sgr A* and a bright cometary source located 0.3 pc from Sgr A*, CXOGC J174539.7-290020. The bipolar lobes consist of a number of emission clumps oriented along a line perpendicular to the Galactic plane, suggesting that a series of ejections has taken place on characteristic time scales of hundreds to thousands of years. The clumps are embedded in a low-intensity, edge-brightened lobe which is most evident in a flux ratio map. At two locations along the lobe, nonthermal linear features are present, suggesting that relativistic electrons may be impinging on the compressed, magnetic wall of this structure. The cometary X-ray source has no counterpart at other wavelengths; its orientation is consistent with a high-velocity neutron star ejected from the grouping of stars at IRS13, but there are problems with that hypothesis, and other models warrant consideration.

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