Folie 1 - Pi of the Sky
... The first generation of stars. Early galaxy formation. The chemical enrichment of the universe. The reionizaion of the universe, all the way back to the ‘dark ages’. Soltan institute for Nuclear Studies Warsaw 14.01.2005 ...
... The first generation of stars. Early galaxy formation. The chemical enrichment of the universe. The reionizaion of the universe, all the way back to the ‘dark ages’. Soltan institute for Nuclear Studies Warsaw 14.01.2005 ...
Pounds K. - X-ray Astronomy and Cosmology group group
... bleep bleep lasted for only 21 days - but shook the world rocket case visible for several months and orbit decay used to ...
... bleep bleep lasted for only 21 days - but shook the world rocket case visible for several months and orbit decay used to ...
An Analysis of the Behavior of Vela X-1
... compact object is ~283 seconds and it is not changing. – The compact object is a neutron star based on its luminosity (from the energy spectrum flux) of ~1036 ergs sec-1 – It is a pulsar because it is in a MXRB and has a Power law Model fit. Literature support: Kretschmar, 2004, Charles and Seward, ...
... compact object is ~283 seconds and it is not changing. – The compact object is a neutron star based on its luminosity (from the energy spectrum flux) of ~1036 ergs sec-1 – It is a pulsar because it is in a MXRB and has a Power law Model fit. Literature support: Kretschmar, 2004, Charles and Seward, ...
essay - Caltech Astronomy
... It is my deep conviction that all phenomena in nature are interesting. The key to appreciate Nature is to discover phenomena. For this reason I list my best four discoveries: the first millisecond pulsar, the first brown dwarf, the discovery that gamma-ray bursts (GRB) are of extra-galactic origin a ...
... It is my deep conviction that all phenomena in nature are interesting. The key to appreciate Nature is to discover phenomena. For this reason I list my best four discoveries: the first millisecond pulsar, the first brown dwarf, the discovery that gamma-ray bursts (GRB) are of extra-galactic origin a ...
Mass extinctions and supernova explosions
... running out of nuclear fuel (type II SNe), or in binary systems, where mass flow from a main sequence star onto a white dwarf, exceeding the Chandrasekhar limit and causing a thermonuclear explosion (type Ia SNe). Cosmic rays are a particle radiation, composed mostly of protons and a small fraction ...
... running out of nuclear fuel (type II SNe), or in binary systems, where mass flow from a main sequence star onto a white dwarf, exceeding the Chandrasekhar limit and causing a thermonuclear explosion (type Ia SNe). Cosmic rays are a particle radiation, composed mostly of protons and a small fraction ...
the Full Chapter 6 -
... most energetic events in the Universe are the gamma-ray bursts: catastrophic terminal explosions of very massive, rapidly spinning stars. In less than a second, they release more energy than the Sun does in ten billion years. Hubble, Spitzer, Chandra, XMM-Newton, Integral and GLAST are versatile gia ...
... most energetic events in the Universe are the gamma-ray bursts: catastrophic terminal explosions of very massive, rapidly spinning stars. In less than a second, they release more energy than the Sun does in ten billion years. Hubble, Spitzer, Chandra, XMM-Newton, Integral and GLAST are versatile gia ...
Study of the Point Spread Function of AGILE
... the first of a new generation of high-energy space Figure 1: the AGILE payload. The gammamissions based on solid-state silicon technology, ray imager GRID and, on top of it, the hard X-ray Super-AGILE detector. combining for the first time two sophisticated co-axial instruments: the Gamma-Ray Imagin ...
... the first of a new generation of high-energy space Figure 1: the AGILE payload. The gammamissions based on solid-state silicon technology, ray imager GRID and, on top of it, the hard X-ray Super-AGILE detector. combining for the first time two sophisticated co-axial instruments: the Gamma-Ray Imagin ...
Folie 1 - univie.ac.at
... The 20cm cube structure houses three orthogonal reaction wheels and three magnetorquer coils for three-axis attitude control and momentum dumping. Attitude determination is provided by a magnetometer, six sun sensors and a star tracker. This equipment will enable attitude determination to 1 arcminut ...
... The 20cm cube structure houses three orthogonal reaction wheels and three magnetorquer coils for three-axis attitude control and momentum dumping. Attitude determination is provided by a magnetometer, six sun sensors and a star tracker. This equipment will enable attitude determination to 1 arcminut ...
Final Exam Space Unit Review
... “at an azimuth of 180oS). Azimuth coordinates MUST have degrees PLUS direction. Do the 3 practice problems on pg. 359 and the Alt-Azimuth Coordinates Practice Sheet (BLM 5Draw and label “altitude” and “azimuth” on the appropriate line for each star. Learning check: A celestial object that is locat ...
... “at an azimuth of 180oS). Azimuth coordinates MUST have degrees PLUS direction. Do the 3 practice problems on pg. 359 and the Alt-Azimuth Coordinates Practice Sheet (BLM 5Draw and label “altitude” and “azimuth” on the appropriate line for each star. Learning check: A celestial object that is locat ...
The X-ray/hard X-ray/gamma-ray connection of gamma
... The 553.7 ks IBIS/ISGRI exposure is cut into 7 time spans of 79 ks each. XSS J12270-4859 is detected with similar significance around 4σ in all but one, there is no long-term variability of XSS J12270-4859 in 18–60 kev band. The 3rd time span has the lowest significance. Though with similar exposure ...
... The 553.7 ks IBIS/ISGRI exposure is cut into 7 time spans of 79 ks each. XSS J12270-4859 is detected with similar significance around 4σ in all but one, there is no long-term variability of XSS J12270-4859 in 18–60 kev band. The 3rd time span has the lowest significance. Though with similar exposure ...
Copyright 1995 Scientific American, Inc.
... should therefore disrupt the binary and nary phase. Since then, the discovery of at Harvard, Þrst measured the gravitasend the two neutron stars (the old three other neutron star binaries shows tional redshift, the loss of energy by one and the one that has just formed ) that other massive pairs hav ...
... should therefore disrupt the binary and nary phase. Since then, the discovery of at Harvard, Þrst measured the gravitasend the two neutron stars (the old three other neutron star binaries shows tional redshift, the loss of energy by one and the one that has just formed ) that other massive pairs hav ...
Radio-quiet Isolated Neutron Stars
... Detected in the RASS between 1990/09/14~1990/10/02. Identified with the 1992/10/16 PSPC data. No variability at levels greater than ~1% in 1hr, or <30% on timescale up to 15 years. ...
... Detected in the RASS between 1990/09/14~1990/10/02. Identified with the 1992/10/16 PSPC data. No variability at levels greater than ~1% in 1hr, or <30% on timescale up to 15 years. ...
The Birth of a Supernova Seen in Real Time
... actually an intense and short-lived X-ray outburst at the moment that the shock wave rips the star apart, the so-called "break out" emission. Unfortunately, since such a transient signal is incredibly hard to detect, this X-ray signature has never been observed. As a result, no supernova has ever be ...
... actually an intense and short-lived X-ray outburst at the moment that the shock wave rips the star apart, the so-called "break out" emission. Unfortunately, since such a transient signal is incredibly hard to detect, this X-ray signature has never been observed. As a result, no supernova has ever be ...
- IRSF: Past and Future
... the central part of the SMC have been repeatedly observed. Over more than 10 years we have observed the two survey areas about 100 and 140 times for the LMC and SMC, respectively. This is the world’s first and only survey that provides near-infrared time series data with such a long time baseline an ...
... the central part of the SMC have been repeatedly observed. Over more than 10 years we have observed the two survey areas about 100 and 140 times for the LMC and SMC, respectively. This is the world’s first and only survey that provides near-infrared time series data with such a long time baseline an ...
The Sun (continued). - Department of Physics and Astronomy
... They collide with other charged particles and change their direction (random walk). They also decrease their energy while walking. It takes ~10 million year to get outside. The random bouncing occurs in the radiation zone (from the core to ~70% of the Sun’s radius). At T<2 million K, the convection ...
... They collide with other charged particles and change their direction (random walk). They also decrease their energy while walking. It takes ~10 million year to get outside. The random bouncing occurs in the radiation zone (from the core to ~70% of the Sun’s radius). At T<2 million K, the convection ...
LIGHT VS. DISTANCE
... What is brightness? Definition for a STAR: the amount of energy that lands on a square meter of Earth every second. Unit: watts/square meter ...
... What is brightness? Definition for a STAR: the amount of energy that lands on a square meter of Earth every second. Unit: watts/square meter ...
Broad Relativistic Iron Lines from Neutron Star LMXBs
... What is the nature of super-dense (5-10 times the nuclear density) degenerate matter (temperature 108 K) at the neutron star core? This is a fundamental problem of physics. Particle colliders (which probe a different regime of temperature/density) cannot answer this question. One has to constrain ...
... What is the nature of super-dense (5-10 times the nuclear density) degenerate matter (temperature 108 K) at the neutron star core? This is a fundamental problem of physics. Particle colliders (which probe a different regime of temperature/density) cannot answer this question. One has to constrain ...
PowerPoint プレゼンテーション
... Quarks to Universe in Computational Science(QUCS 2012) @NARA Prefectural New Public Hall ...
... Quarks to Universe in Computational Science(QUCS 2012) @NARA Prefectural New Public Hall ...
Document
... Blazars are powerful gamma-ray sources. The most powerful of them have equivalent isotropic luminosity 1049 erg/s. Collimation θ2/2 ~ 10-2 – 10-3. θ – jet opening angle. EGRET detected 66 (+27) sources of this type. New breakthrough is expected after the launch of GLAST. Several sources have been de ...
... Blazars are powerful gamma-ray sources. The most powerful of them have equivalent isotropic luminosity 1049 erg/s. Collimation θ2/2 ~ 10-2 – 10-3. θ – jet opening angle. EGRET detected 66 (+27) sources of this type. New breakthrough is expected after the launch of GLAST. Several sources have been de ...
AGN jets
... Blazars are powerful gamma-ray sources. The most powerful of them have equivalent isotropic luminosity 1049 erg/s. Collimation θ2/2 ~ 10-2 – 10-3. θ – jet opening angle. EGRET detected 66 (+27) sources of this type. New breakthrough is expected after the launch of GLAST. Several sources have been de ...
... Blazars are powerful gamma-ray sources. The most powerful of them have equivalent isotropic luminosity 1049 erg/s. Collimation θ2/2 ~ 10-2 – 10-3. θ – jet opening angle. EGRET detected 66 (+27) sources of this type. New breakthrough is expected after the launch of GLAST. Several sources have been de ...
Stars and galaxies Intro
... • Use special reflectors to focus X-rays and produce an image • The first X-ray telescopes were used to observe the sun. FYI: The Chandra X-ray Observatory ...
... • Use special reflectors to focus X-rays and produce an image • The first X-ray telescopes were used to observe the sun. FYI: The Chandra X-ray Observatory ...
PSR J1833-1034
... – For each energy bin we apply the likelihood analysis in an energy range as large as the width of the bin – In this case the investigated source is modeled with a segment of power-law with fixed index ( = 2.0) for each energy bin – Minimized the Likelihood, the differential flux of our source in e ...
... – For each energy bin we apply the likelihood analysis in an energy range as large as the width of the bin – In this case the investigated source is modeled with a segment of power-law with fixed index ( = 2.0) for each energy bin – Minimized the Likelihood, the differential flux of our source in e ...
VERA Project : overview and current status
... High-precision Astrometric Missions Near-future projects for 10 micro-arcsec astrometry ...
... High-precision Astrometric Missions Near-future projects for 10 micro-arcsec astrometry ...