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Discovery of Oxygen Kalpha X-ray Emission from the Rings of Saturn | Anil Bhardwaj
; Ronald F. Elsner
; J. Hunter Waite
; Jr.
; G. Randall Gladstone
; Thomas E. Cravens
; Peter G. Ford
; | Date: |
19 May 2005 | Journal: | Astrophys.J. 627 (2005) L73-L76 | Subject: | astro-ph | Abstract: | Using the Advanced CCD Imaging Spectrometer (ACIS), the Chandra X-ray Observatory (CXO) observed the Saturnian system for one rotation of the planet (~37 ks) on 20 January, 2004, and again on 26-27 January, 2004. In this letter we report the detection of X-ray emission from the rings of Saturn. The X-ray spectrum from the rings is dominated by emission in a narrow (~130 eV wide) energy band centered on the atomic oxygen K-alpha fluorescence line at 0.53 keV. The X-ray power emitted from the rings in the 0.49-0.62 keV band is 84 MW, which is about one-third of that emitted from Saturn disk in the photon energy range 0.24-2.0 keV. Our analysis also finds a clear detection of X-ray emission from the rings in the 0.49-0.62 keV band in an earlier (14-15 April, 2003) Chandra ACIS observation of Saturn. Fluorescent scattering of solar X-rays from oxygen atoms in the H2O icy ring material is the likely source mechanism for ring X-rays, consistent with the scenario of solar photo-production of a tenuous ring oxygen atmosphere and ionosphere recently discovered by Cassini. | Source: | arXiv, astro-ph/0505409 | Services: | Forum | Review | PDF | Favorites |
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