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A Candidate Neutron Star Associated with Galactic Center Supernova Remnant Sagittarius A East | | Sangwook Park
; Michael P. Muno
; Frederick K. Baganoff
; Yoshitomo Maeda
; Mark Morris
; George Chartas
; Divas Sanwal
; David N. Burrows
; Gordon P. Garmire
; | | Date: |
8 Jun 2005 | | Subject: | astro-ph | | Affiliation: | Penn State), Michael P. Muno (UCLA), Frederick K. Baganoff (MIT), Yoshitomo Maeda (ISAS), Mark Morris (UCLA), George Chartas (Penn State), Divas Sanwal (Penn State), David N. Burrows (Penn State), and Gordon P. Garmire (Penn State | | Abstract: | We present imaging and spectral studies of the supernova remnant (SNR) Sagittarius (Sgr) A East from deep observations with the {it Chandra X-Ray Observatory}. The spatially-resolved spectral analysis of Sgr A East reveals the presence of a two-temperature thermal plasma ($kT$ $sim$ 1 keV and 5 keV) near the center of the SNR. The central region is dominated by emission from highly-ionized Fe-rich ejecta. We estimate a conservative upper limit on the total Fe ejecta mass of the SNR, M$_{Fe}$ $<$ 0.27 M$_{odot}$. Comparisons with standard SN nucleosynthesis models suggest that this Fe mass limit is consistent with a Type II SN explosion for the origin of Sgr A East. On the other hand, the soft X-ray emission extending toward the north of the SNR can be described by a single-temperature ($kT$ $sim$ 1.3 keV) thermal plasma with normal chemical composition. This portion of the SNR is thus X-ray emission from the heated interstellar medium rather than the metal-rich stellar ejecta. We point out that a hard pointlike source CXOGC J174545.5$-$285829 (the so-called ``cannonball’’) at the northern edge of the SNR shows unusual X-ray characteristics among other Galactic center sources. The morphological, spectral, and temporal characteristics of this source suggest an identification as a high-velocity neutron star. Based on the suggested Type II origin for the SNR Sgr A East and the proximity between the two, we propose that CXOGC J174545.5$-$285829 is a high-velocity neutron star candidate, born from the core-collapse SN which also created the SNR Sgr A East. | | Source: | arXiv, astro-ph/0506168 | | Services: | Forum | Review | PDF | Favorites | |
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