Evidence for Jet Collimation in SS 433 with the Chandra HETGS | Zendy

M. Namiki | Zendy; N. Kawai | Zendy; Taro Kotani | Zendy; Kazuo Makishima | Zendy

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Evidence for Jet Collimation in SS 433 with the Chandra HETGS

Author(s) -

M. Namiki,

N. Kawai,

Taro Kotani,

Kazuo Makishima

Publication year - 2003

Publication title -

publications of the astronomical society of japan

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.99

H-Index - 110

eISSN - 2053-051X

pISSN - 0004-6264

DOI - 10.1093/pasj/55.1.281

Subject(s) - physics , astrophysics , spectral line , line (geometry) , collimated light , spectrometer , jet (fluid) , emission spectrum , ionization , plasma , astronomy , ion , optics , nuclear physics , laser , geometry , mathematics , quantum mechanics , thermodynamics

High-resolution X-ray spectra of SS 433 obtained after a binary egress withthe Chandra High Energy Transmission Grating Spectrometer (HETGS) were studied.Many Doppler-shifted X-ray emission lines from highly ionized elements weredetected. The initial temperature of the jets is estimated to be 20 keV. Thelines are found to generally be broader than the instrumented resolution. Thewidths of the Fe XXV K-alpha and Si XIII K-alpha lines correspond to velocitydispersions of 2100 (+600/-340) km/s and 840 (+180/-150) km/s respectively, interms of Gaussian sigma. Neither the measured line widths nor their dependenceon the atomic number can be explained by thermal broadening alone. Alternativeexplanations of the observed line widths are discussed, including in particulara progressive jet collimation along its axis.Comment: 20 pages, 8 figur

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