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RXTE PCA Contributions to Monitoring Fast Transients
... Rapid Burster and GRS 1747-312: similar durations, different luminosities; XTE J1751-305 vs SAX J1808.4-3658: shorter, but higher luminosity. Many faint transients with distance estimates (from bursts or globular cluster membership) are just distant, not low luminosity at peak or low average dM/dt . ...
... Rapid Burster and GRS 1747-312: similar durations, different luminosities; XTE J1751-305 vs SAX J1808.4-3658: shorter, but higher luminosity. Many faint transients with distance estimates (from bursts or globular cluster membership) are just distant, not low luminosity at peak or low average dM/dt . ...
... • Galaxies and other objects may have motions that have nothing to do with the expansion of space • When galaxies orbit each other, sometimes their orbital speed is much larger than the redshift caused by expansion. • We cannot use Hubble’s law for nearby galaxies, and certainly not for any objects ...
PDF - ASSA
... very high-energy gamma rays. These are absorbed in the atmosphere, where they create a short-lived shower of particles. The HESS telescopes detect the faint, short flashes of bluish light which these particles emit (named Cherenkov light, lasting a few billionths of a second), collecting the light wi ...
... very high-energy gamma rays. These are absorbed in the atmosphere, where they create a short-lived shower of particles. The HESS telescopes detect the faint, short flashes of bluish light which these particles emit (named Cherenkov light, lasting a few billionths of a second), collecting the light wi ...
NSDL_WS_1_Astonomy
... We think Low mass (< 1 Msun) stars also puff out, and eventually become white dwarfs. We do know they are very long lived -- longer than the universe is old. ...
... We think Low mass (< 1 Msun) stars also puff out, and eventually become white dwarfs. We do know they are very long lived -- longer than the universe is old. ...
Comprehensive search for natural satellites of Vesta by the Dawn
... radius of detection was 3.1 m and 4.3 m for 20 s and 270 s exposures respectively. We discuss the reason for the reverse relation between detection limits and exposure times in Section 6. If any larger collisional ejecta were in orbit around Vesta in the past, they are not there now. 2. Observations ...
... radius of detection was 3.1 m and 4.3 m for 20 s and 270 s exposures respectively. We discuss the reason for the reverse relation between detection limits and exposure times in Section 6. If any larger collisional ejecta were in orbit around Vesta in the past, they are not there now. 2. Observations ...
Optical Spectroscopy of a Flare on Barnard`s Star
... Švestka 1972; Garcı́a-Alvarez et al. 2002). As described below, while the H and He lines are broadened, other chromospheric lines such as Ca II H&K are not broadened during the flare event. This is evidence for Stark broadening. The measured Balmer decrements (relative to Hγ) are listed in Table 3 ...
... Švestka 1972; Garcı́a-Alvarez et al. 2002). As described below, while the H and He lines are broadened, other chromospheric lines such as Ca II H&K are not broadened during the flare event. This is evidence for Stark broadening. The measured Balmer decrements (relative to Hγ) are listed in Table 3 ...
ctioPI
... CALIBRATION FRAMES --- BIASES AND DOME FLATS ________________________________________________________________________ Only one set of calibration frames is taken each night. The set of calibration frames should be for either the full-chip or quarter-chip mode, BUT NOT BOTH. Science images may still ...
... CALIBRATION FRAMES --- BIASES AND DOME FLATS ________________________________________________________________________ Only one set of calibration frames is taken each night. The set of calibration frames should be for either the full-chip or quarter-chip mode, BUT NOT BOTH. Science images may still ...
Thinking Outside the Sphere
... Fludd presents the cosmos as a biblical allegory in this image. The globe of the earth is illustrated with the figures of Adam and Eve in the Garden of Eden; the narrative of Creation in Genesis is represented by the fish of the sea and birds of the air. The sun, moon, and planets created on the fou ...
... Fludd presents the cosmos as a biblical allegory in this image. The globe of the earth is illustrated with the figures of Adam and Eve in the Garden of Eden; the narrative of Creation in Genesis is represented by the fish of the sea and birds of the air. The sun, moon, and planets created on the fou ...
The Formation and Evolution of Massive Black Holes - Ira-Inaf
... massive star is to collapse into a black hole with a mass similar to that of its progenitor. However, this is not the case when the content of heavy elements increases. In today’s universe, a very massive star would lose most of its mass in powerful winds before collapsing into a stellar mass black ...
... massive star is to collapse into a black hole with a mass similar to that of its progenitor. However, this is not the case when the content of heavy elements increases. In today’s universe, a very massive star would lose most of its mass in powerful winds before collapsing into a stellar mass black ...
sporadic solar radio emission at decameter wavelengths
... In 2001–2002 we have firstly observed Type II bursts in the frequency range 10–30MHz (Figure 4 and 5) [Mel’nik et al. 2004b]. At these frequencies they drifted with rate 30 – 70 kHz/s. Their instantaneous bandwidth was 1–3 MHz. They often consist of lanes similar to the ones at higher frequencies. T ...
... In 2001–2002 we have firstly observed Type II bursts in the frequency range 10–30MHz (Figure 4 and 5) [Mel’nik et al. 2004b]. At these frequencies they drifted with rate 30 – 70 kHz/s. Their instantaneous bandwidth was 1–3 MHz. They often consist of lanes similar to the ones at higher frequencies. T ...
infoBIT - Gift Lake School
... all reveal different interpretations of how the universe works. Seen from Earth, everything in the sky appears to be in motion. The Sun rises and sets. The Moon, in its ever-changing phases, travels across the sky. Planets shift against a background of stars. Even constellations (groupings of stars) ...
... all reveal different interpretations of how the universe works. Seen from Earth, everything in the sky appears to be in motion. The Sun rises and sets. The Moon, in its ever-changing phases, travels across the sky. Planets shift against a background of stars. Even constellations (groupings of stars) ...
talk
... GMRT HI images HST V and I band optical images ► TRGB distance (accuracy of ~ 10%) known for most galaxies First large sample of faint dwarfs with accurate distances ...
... GMRT HI images HST V and I band optical images ► TRGB distance (accuracy of ~ 10%) known for most galaxies First large sample of faint dwarfs with accurate distances ...
Grade 9 Space Review 50KB Nov 18 2009 10:52:00 AM
... 27. Write a short paragraph describing two essential parts that all telescopes have in common and state the purpose of each part. Use a diagram to illustrate your answer. 28. Not all telescopes use light. Write a short paragraph explaining this statement and provide several examples. 29. Amateur ast ...
... 27. Write a short paragraph describing two essential parts that all telescopes have in common and state the purpose of each part. Use a diagram to illustrate your answer. 28. Not all telescopes use light. Write a short paragraph explaining this statement and provide several examples. 29. Amateur ast ...
Complete Lecture Notes (pdf file)
... Rs the stellar radius. Energy may also be lost in the form of neutrinos or by direct mass loss (generally unobservable). Astronomers measure: f • To obtain L for: ...
... Rs the stellar radius. Energy may also be lost in the form of neutrinos or by direct mass loss (generally unobservable). Astronomers measure: f • To obtain L for: ...
icso-2014-New desing-new challenge for space large
... ni divulgué à un tiers sans l'accord préalable et écrit de Thales Alenia Space - © 2012, Thales Alenia Space ...
... ni divulgué à un tiers sans l'accord préalable et écrit de Thales Alenia Space - © 2012, Thales Alenia Space ...
The Sun
... to be stable. Earth's magnetic field reverses ~ every million years. The Sun's magnetic field is generated close to the surface. The magnetic field is dragged with the Sun's differential rotation, and it will wind up. ...
... to be stable. Earth's magnetic field reverses ~ every million years. The Sun's magnetic field is generated close to the surface. The magnetic field is dragged with the Sun's differential rotation, and it will wind up. ...
It is now recognized that the vast majority of ellipticals are of
... absorbing material is distributed in rings or disks. Dust lanes may be aligned with either the major or minor axes, or they may be warped. • E galaxies contain modest amounts of cool and warm gas, although not as much as is found in S galaxies. A few E galaxies have extended disks of neutral hydroge ...
... absorbing material is distributed in rings or disks. Dust lanes may be aligned with either the major or minor axes, or they may be warped. • E galaxies contain modest amounts of cool and warm gas, although not as much as is found in S galaxies. A few E galaxies have extended disks of neutral hydroge ...
Detection of the Stochastic Background of nHz Gravitational Radiation from Massive Black
... [1] The pulse arrival time at the telescope is referenced through the GPS System (left) to the USNO master clock ensemble in Wash., DC (below). ...
... [1] The pulse arrival time at the telescope is referenced through the GPS System (left) to the USNO master clock ensemble in Wash., DC (below). ...
Astronomy and Astrophysics (ASTRO)
... ASTRO 584: Galactic Astronomy (3-0) Cr. 3. Alt. S., offered even-numbered years. Prereq: ASTRO 405 or ASTRO 505 or permission of instructor Overall structure of our Galaxy and the interstellar medium. Physical processes in the interstellar medium (e.g., heating and cooling mechanisms, turbulence). O ...
... ASTRO 584: Galactic Astronomy (3-0) Cr. 3. Alt. S., offered even-numbered years. Prereq: ASTRO 405 or ASTRO 505 or permission of instructor Overall structure of our Galaxy and the interstellar medium. Physical processes in the interstellar medium (e.g., heating and cooling mechanisms, turbulence). O ...
Astronomical Geography: An Examination of the Early American
... book included only this short introductory paragraph on planetary satellites: "A satellite, or moon, is a body revolving round a planet, and, in company with the planet, round the sun . Of these there are 18 in our solar system, distributed in the following manner: 1 to Earth ; 4 to Jupiter; 7 to Sa ...
... book included only this short introductory paragraph on planetary satellites: "A satellite, or moon, is a body revolving round a planet, and, in company with the planet, round the sun . Of these there are 18 in our solar system, distributed in the following manner: 1 to Earth ; 4 to Jupiter; 7 to Sa ...
International Ultraviolet Explorer
![](https://en.wikipedia.org/wiki/Special:FilePath/International_Ultraviolet_Explorer.gif?width=300)
The International Ultraviolet Explorer (IUE) was an astronomical observatory satellite primarily designed to take ultraviolet spectra. The satellite was a collaborative project between NASA, the UK Science Research Council and the European Space Agency (ESA). The mission was first proposed in early 1964, by a group of scientists in the United Kingdom, and was launched on January 26, 1978 aboard a NASA Delta rocket. The mission lifetime was initially set for 3 years, but in the end it lasted almost 18 years, with the satellite being shut down in 1996. The switch-off occurred for financial reasons, while the telescope was still functioning at near original efficiency.It was the first space observatory to be operated in real time by astronomers who visited the groundstations in the United States and Europe. Astronomers made over 104,000 observations using the IUE, of objects ranging from solar system bodies to distant quasars. Among the significant scientific results from IUE data were the first large scale studies of stellar winds, accurate measurements of the way interstellar dust absorbs light, and measurements of the supernova SN1987A which showed that it defied stellar evolution theories as they then stood. When the mission ended, it was considered the most successful astronomical satellite ever.