نتایج جستجو برای: 30 cm disk
تعداد نتایج: 689375 فیلتر نتایج به سال:
During the disk-mediated accretion phase, the high-resolution X-ray spectrum of the low-mass Xray binary system EXO 0748-676 reveals a photoionized plasma which is orbiting the neutron star. Our observations with the Chandra High Energy Transmission Grating Spectrometer (HETGS) constrain the structure of the upper layers of the accretion disk, by means of the recombination emission lines from t...
CO is widely used as a tracer of molecular gas. However, there is now mounting evidence that gas phase carbon is depleted in the disk around TW Hya. Previous efforts to quantify this depletion have been hampered by uncertainties regarding the radial thermal structure in the disk. Here we present resolved ALMA observations of CO 3-2, CO 3-2, CO 6-5, and CO 6-5 emission in TW Hya, which allow us ...
We report variability of the X-ray source, X-7, in NGC 6946, during a 60 ksec Chandra observation when the count rate decreased by a factor of ∼ 1.5 in ∼ 5000 secs. Spectral fitting of the high and low count rate segments of the light curve reveal that the simplest and most probable interpretation is that the X-ray spectra are due to disk black body emission with an absorbing hydrogen column de...
The study of the kinematics of globular clusters in the outer regions of the Large Magellanic Cloud by Schommer et al. [1] suggested a flat rotation curve, perhaps out to 15 kpc: the LMC might have a dark matter halo. Here, from a composite H i and star cluster rotation curve (fig. 1), I want to estimate the parameters of an isothermal halo added to a ‘maximum disk.’ Luks and Rohlfs [2], in the...
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