نتایج جستجو برای: sgr 193031
تعداد نتایج: 3001 فیلتر نتایج به سال:
The identification of two new Planetary Nebulae in the Sagittarius Dwarf Spheroidal Galaxy (Sgr) is presented. This brings the total number to four. Both new PNe were previously classified as Galactic objects. The first, StWr 2-21, belongs to the main body of Sgr, from its velocity and location. The second, the halo PN BoBn 1, has a location, distance and velocity in agreement with the leading ...
The Galactic center provides a unique astrophysical laboratory for us to study various astrophysical processes. In this paper, we review and outline the latest results from observations of Sgr A∗ in terms of source structure and variations in flux density. Sgr A∗ phenomenon represents a typical case of low radiative efficiency accretion flow surrounding a supermassive black hole in low luminosi...
In order to observe nearly simultaneous emission from Gamma-ray Bursts (GRBs), the Robotic Optical Transient Search Experiment (ROTSE) receives triggers via the GRB Coordinates Network (GCN). Since beginning operations in March, 1998, ROTSE has also taken useful data for 10 SGR events: 8 from SGR 1900+14 and 2 from SGR 1806-20. We have searched for new or variable sources in the error regions o...
The center of our Galaxy hosts a supermassive black hole, Sagittarius (Sgr) A∗. Young, massive stars within 0.5 pc of Sgr A∗ are evidence of an episode of intense star formation near the black hole a few Myr ago, which might have left behind a young neutron star traveling deep into Sgr A∗’s gravitational potential. On 2013 April 25, a short X-ray burst was observed from the direction of the Gal...
We report the discovery of a new soft gamma repeater (SGR), SGR 1627–41, and present BATSE observations of the burst emission and BeppoSAX NFI observations of the probable persistent Xray counterpart to this SGR. All but one burst spectrum are well fit by an optically thin thermal bremsstrahlung (OTTB) model with kT values between 25 and 35 keV. The spectrum of the X-ray counterpart, SAX J1635....
With 10 years of high-resolution imaging data now available on the stellar cluster in the Galactic Center, we analyze the dynamics of the stars at projected distances ≤ 1.2 ′′ from the central black hole candidate Sagittarius A* (Sgr A*). We find evidence for radial anisotropy of the cluster of stars surrounding Sgr A*. We confirm/find accelerated motion for 6 stars, with 4 stars having passed ...
Burning mouth syndrome (BMS) is characterized by oral burning or painful sensations without pathological changes; its real cause is unknown. We previously reported that autonomic lability was probably associated with the pathogenesis of BMS based on the results of frequency analysis of heart rate variability (HRV). HRV is composed of time and frequency domains, although the significance of the ...
The main characteristics of a wide photometric survey of the Sgr dwarf spheroidal galaxy are shortly presented. V and I photometry has been obtained for ∼ 90000 stars toward Sgr and for ∼ 9000 stars in a region devoid of Sgr stars (for decontamination purposes). The full potential of this large database is far from being completely explored. Here we present only preliminary results from the ana...
Wepresent V,I deep CCD photometry for three fields of the dwarf galaxy in Sagittarius (Sgr), located at l=5.6, b=14.1. One of the fields is centered on the globular cluster NGC 6715 (M54), which lies in one of the dense clumps of the Sgr galaxy. Comparing the CMD of Sgr with those of globular clusters which are believed to be kinematically associated with the dwarf galaxy (Da Costa & Armandroff...
The radio source Sgr A at the center of our Galaxy is believed to be a 2.6× 10M⊙ black hole which accretes gas from the winds of nearby stars. We show that limits on the X-ray and infrared emission from the Galactic Center provide an upper limit of ∼ 8 × 10M⊙ yr −1 on the mass accretion rate in Sgr A. The advection-dominated accretion flow (ADAF) model favors a rate <∼ 10 M⊙ yr . In comparison,...
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