Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-08-28
Astrophys.J.690:143-153,2009
Astronomy and Astrophysics
Astrophysics
10 pages, 7 figures, 3 tables, accepted for publication in ApJ, 2009
Scientific paper
10.1088/0004-637X/690/1/143
We present Suzaku spectra of X-ray emission in the fields just off the LMC X-3 sight line. OVII, OVIII, and NeIX emission lines are clearly detected, suggesting the presence of an optically thin thermal plasma with an average temperature of 2.4E6. This temperature is significantly higher than that inferred from existing X-ray absorption line data obtained with Chandra grating observations of LMC X-3, strongly suggesting that the gas is not isothermal. We then jointly analyze these data to characterize the spatial and temperature distributions of the gas. Assuming a vertical exponential Galactic disk model, we estimate the gas temperature and density at the Galactic plane and their scale heights as 3.6(2.9, 4.7)E6 K and 1.4(0.3, 3.4)E-3 cm^{-3} and 1.4(0.2, 5.2) kpc and $2.8(1.0, 6.4)$ kpc, respectively. This characterization can account for all the \ovi line absorption, as observed in a FUSE spectrum of LMC X-3, but only predicts less than one tenth of the OVI line emission intensity typically detected at high Galactic latitudes. The bulk of the OVI emission most likely arises at interfaces between cool and hot gases.
Hagihara Toshishige
McCammon Dan
Mitsuda Kazu
Wang Daniel Q.
Yamasaki Noriko Y.
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