نتایج جستجو برای: extended star
تعداد نتایج: 292583 فیلتر نتایج به سال:
We discuss the gamma-ray absorption in the inner region of the microquasar SS433. Our investigation includes several contributions to the opacity of this system. They result from the ambient fields generated by the primary star, possibly an A-type supergiant, and a very extended disk around the black hole. We find an important source for gamma-ray absorption in the UV photon field from the exte...
Using coherent states of the Weyl-Heisenberg algebra hN , extended Voros products and Moyal brakets are derived. The covariance of Voros product under canonical transformations is discussed. Star product related to BarutGirardello coherent states of the Lie algebra su(1, 1) is also considered. The star eigenvalue problem of singular harmonic osillator is investigated.
We have constructed an extended halo model (EHM) which relates the total stellar mass and star-formation rate (SFR) to halo mass (Mh). An empirical relation between the distribution functions of total stellar mass of galaxies and host halo mass, tuned to match the spatial density of galaxies over 0 < z < 2 and the clustering properties at z ∼ 0, is extended to include two different scenarios de...
We present 10 μm, ISO-SWS and Australia Telescope Compact Array observations of the region in the cluster Wd1 in Ara centred on the B[e] star Ara C. An ISOSWS spectrum reveals emission from highly ionised species in the vicinity of the star, suggesting a secondary source of excitation in the region. We find strong radio emission at both 3.5cm and 6.3cm, with a total spatial extent of over 20 ar...
We report on low-resolution spectroscopy of GX339–4 during its current, extended X-ray 'off' state in May 2000 (r=20.1) obtained with the VLT Focal Re-ducer/low dispersion Spectrograph (FORS1). Although we do not positively detect the secondary star in GX339–4 we place an upper limit of 30 percent on the contribution of a " normal " K-type secondary star spectrum to the observed flux. Using thi...
The problem of star formation within the interacting pair NGC7733/34 has been studied, based on the UBVRI photometry of the source. The distribution of the colors of selected regions within the galaxies is used to infer an estimate for the age distribution of the star forming regions. The results seem to indicate the presence of numerous extended young star-forming regions in the disk of one of...
let $d$ be an integral domain and $star$ a semistar operation stable and of finite type on it. we define the semistar dimension (inequality) formula and discover their relations with $star$-universally catenarian domains and $star$-stably strong s-domains. as an application, we give new characterizations of $star$-quasi-pr&quot;{u}fer domains and um$t$ domains in terms of dimension ine...
We present Chandra observations of two star-forming galaxies (M 82 and the Antennae) and three starburst/AGN composite galaxies (NGC 1808, NGC 6240, NGC 7331). In both star-forming galaxies we detect a large number of sources with diverse properties. Some of them can be identified as X-ray binaries, based on their variability and spectra. However, there is a significant number of very soft and/...
During a previous outburst phase, the neutron star 4U 2129+47 exhibited evidence for a spatially extended Accretion Disk Corona (ADC) via broad, partial X-ray eclipses occurring periodically on the 5.24 hr orbit. Since 1983, however, 4U 2129+47 has entered a quiescent state several orders of magnitude fainter. We have performed a 37 ksec (≈2 binary orbits) Chandra observation of 4U 2129+47 to d...
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