Stellar Masses
... • The prelude to Hubble’s Law was the establishment of measurements of galactic distances and also measurements of their Doppler shifts. • Vesto Slipher [Lowell Observatory] measured the redshifts of many galaxies[nebulae] in the early decades of the 20thC. They were expected to be random but he fou ...
... • The prelude to Hubble’s Law was the establishment of measurements of galactic distances and also measurements of their Doppler shifts. • Vesto Slipher [Lowell Observatory] measured the redshifts of many galaxies[nebulae] in the early decades of the 20thC. They were expected to be random but he fou ...
Powerpoint
... pulsar of < 5 ms period if rotation and B-fields are to matter. This is much faster than observed in common pulsars. A concern: If calculate the presupernova evolution with the same efficient magnetic field generating algorithms as used in some core collapse simulations, will it be rotating at all? ...
... pulsar of < 5 ms period if rotation and B-fields are to matter. This is much faster than observed in common pulsars. A concern: If calculate the presupernova evolution with the same efficient magnetic field generating algorithms as used in some core collapse simulations, will it be rotating at all? ...
Link again
... 900 kilometers. Pallas and Vesta have diameters around 500 kilometers. There are thousands that are kilometer sized and millions smaller that a large boulder in the asteroid belt (the region between Mars and Jupiter). Chunks of ice called “comets” can be found in orbits beyond Pluto. Some comets hav ...
... 900 kilometers. Pallas and Vesta have diameters around 500 kilometers. There are thousands that are kilometer sized and millions smaller that a large boulder in the asteroid belt (the region between Mars and Jupiter). Chunks of ice called “comets” can be found in orbits beyond Pluto. Some comets hav ...
Astronomy
... 900 kilometers. Pallas and Vesta have diameters around 500 kilometers. There are thousands that are kilometer sized and millions smaller that a large boulder in the asteroid belt (the region between Mars and Jupiter). Chunks of ice called “comets” can be found in orbits beyond Pluto. Some comets hav ...
... 900 kilometers. Pallas and Vesta have diameters around 500 kilometers. There are thousands that are kilometer sized and millions smaller that a large boulder in the asteroid belt (the region between Mars and Jupiter). Chunks of ice called “comets” can be found in orbits beyond Pluto. Some comets hav ...
ICRANet Scientific Report 2012
... 2) To create an adjunct Faculty containing many renowned scientists who have made internationally recognized contributions to the field of relativistic astrophysics and whose research interests are closely related to those of ICRANet. These scientists spend from one to six months at the Pescara Cent ...
... 2) To create an adjunct Faculty containing many renowned scientists who have made internationally recognized contributions to the field of relativistic astrophysics and whose research interests are closely related to those of ICRANet. These scientists spend from one to six months at the Pescara Cent ...
News Release - האוניברסיטה העברית
... central disk, followed by mergers between disks. The assumption is that the stars formed slowly within the gaseous disks, and that the disks converted into globes when they merged. In such a merger, the colliding gas clouds produce a big burst of new stars at a rate of hundreds of solar masses per y ...
... central disk, followed by mergers between disks. The assumption is that the stars formed slowly within the gaseous disks, and that the disks converted into globes when they merged. In such a merger, the colliding gas clouds produce a big burst of new stars at a rate of hundreds of solar masses per y ...
Frantic Finish - Max-Planck
... THE ASTRONOMERS GUESSING It could then also be possible to solve a mystery that has increasingly moved into the research spotlight in recent years: ultrabright supernovae, or superluminous supernovae, as astronomers call them. The scientists observed the first example of this type in 2010. Although ...
... THE ASTRONOMERS GUESSING It could then also be possible to solve a mystery that has increasingly moved into the research spotlight in recent years: ultrabright supernovae, or superluminous supernovae, as astronomers call them. The scientists observed the first example of this type in 2010. Although ...
Universe ppt - Killeen ISD
... Moving Galaxies - Astronomers use information about how galaxies are moving as one way to develop ideas about how the universe formed. By examining the visible light spectrum of a galaxy, astronomers can tell how fast the galaxy is moving toward or away from our galaxy (the Milky Way). Only a few of ...
... Moving Galaxies - Astronomers use information about how galaxies are moving as one way to develop ideas about how the universe formed. By examining the visible light spectrum of a galaxy, astronomers can tell how fast the galaxy is moving toward or away from our galaxy (the Milky Way). Only a few of ...
slides
... The central core (which, in the most massive stars, is made of iron) undergoes a sudden gravitational collapse, reducing in size until all the electrons in the atoms are smashed down into the nulcei. ...
... The central core (which, in the most massive stars, is made of iron) undergoes a sudden gravitational collapse, reducing in size until all the electrons in the atoms are smashed down into the nulcei. ...
Supernova and Supernova Remnants lec 1-2
... They are also cosmic accelerators (cosmic rays). Birth places of neutron stars and stellar mass black holes. laboratories for study of magnetic fields, shock physics, jets, winds, nuclear physics etc • SNR evolution (and their appearance now) depends on many factors: – age – environment (density) – ...
... They are also cosmic accelerators (cosmic rays). Birth places of neutron stars and stellar mass black holes. laboratories for study of magnetic fields, shock physics, jets, winds, nuclear physics etc • SNR evolution (and their appearance now) depends on many factors: – age – environment (density) – ...
Carolina Kehrig
... elevated HeII emission for a longer period of time (e.g. Eldridge+2009,2011; Talks by J.Eldridge & E.Stanway) ...
... elevated HeII emission for a longer period of time (e.g. Eldridge+2009,2011; Talks by J.Eldridge & E.Stanway) ...
Section I - General Information Proposal Title: The effect of the group
... what happens to the gas in the more common group environment is still unclear, because we still lack an HI survey able to probe the gas-poor regime for a statistically significant sample of galaxies in groups. We propose to use Arecibo to measure the HI content of about 200 galaxies in large groups ...
... what happens to the gas in the more common group environment is still unclear, because we still lack an HI survey able to probe the gas-poor regime for a statistically significant sample of galaxies in groups. We propose to use Arecibo to measure the HI content of about 200 galaxies in large groups ...
Catching Andromeda`s Light
... Andromeda’s spiral arms, he thought they might also trace the Milky Way’s spiral arms. So in 1951, Morgan mapped the locations of all the red clouds of gas he and his colleagues could find. He discovered that the gas clouds lined up along spiral arms, indicating that we live in a spiral galaxy. Why ...
... Andromeda’s spiral arms, he thought they might also trace the Milky Way’s spiral arms. So in 1951, Morgan mapped the locations of all the red clouds of gas he and his colleagues could find. He discovered that the gas clouds lined up along spiral arms, indicating that we live in a spiral galaxy. Why ...
OVERVIEW: Stars and space
... Supernovae When a red supergiant star causes iron in its core to undergo nuclear fusion energy is absorbed causing a great implosion. This rebounds and causes a massive explosion that can for a few days outshine a whole galaxy. This is called a supernova. Supernovae are very rare. They can be seen ...
... Supernovae When a red supergiant star causes iron in its core to undergo nuclear fusion energy is absorbed causing a great implosion. This rebounds and causes a massive explosion that can for a few days outshine a whole galaxy. This is called a supernova. Supernovae are very rare. They can be seen ...
This document was created for people who do not have access to
... of our Milky Way galaxy. As we leave the Milky Way, we find ourselves in a universe filled with billions of galaxies. Because the light from distant galaxies takes vast amounts of time to reach our telescopes here on Earth, we see these galaxies as they looked in the past, when the universe was very ...
... of our Milky Way galaxy. As we leave the Milky Way, we find ourselves in a universe filled with billions of galaxies. Because the light from distant galaxies takes vast amounts of time to reach our telescopes here on Earth, we see these galaxies as they looked in the past, when the universe was very ...
How Big Is Our Universe? - Harvard
... The image at left is the oldest and youngest picture of the universe ever taken. Oldest, because it has taken the light nearly 14 billion years to reach us. Youngest, because it is a snapshot of our newborn universe, long before the first stars and galaxies formed. The bright patterns show clumps of ...
... The image at left is the oldest and youngest picture of the universe ever taken. Oldest, because it has taken the light nearly 14 billion years to reach us. Youngest, because it is a snapshot of our newborn universe, long before the first stars and galaxies formed. The bright patterns show clumps of ...
GRB EXPERIMENT
... • They become active and emit bursts at apparently random times • Two common types of bursts: – Short (100 ms, up to 1041 erg s-1) – Giant flares (several hundred seconds, periodic emission, up to 1046 erg s-1) ...
... • They become active and emit bursts at apparently random times • Two common types of bursts: – Short (100 ms, up to 1041 erg s-1) – Giant flares (several hundred seconds, periodic emission, up to 1046 erg s-1) ...
Galaxies have different sizes and shapes.
... Galaxies differ greatly in size. Some contain as few as a hundred million stars, but the biggest have more than a trillion stars. Galaxies also vary in shape. Astronomers have classified galaxies into three main types based on their shape. Check Your Reading ...
... Galaxies differ greatly in size. Some contain as few as a hundred million stars, but the biggest have more than a trillion stars. Galaxies also vary in shape. Astronomers have classified galaxies into three main types based on their shape. Check Your Reading ...
Chapter 27 Quasars, Active Galaxies, and Gamma
... from stars, nebulae, and some galaxies. • There were also point-like, or star-like, radio sources which varied rapidly these are the `quasi-stellar’ radio sources or quasars. • In visible light quasars appear as points, like stars. ...
... from stars, nebulae, and some galaxies. • There were also point-like, or star-like, radio sources which varied rapidly these are the `quasi-stellar’ radio sources or quasars. • In visible light quasars appear as points, like stars. ...
Blowing Bubbles in Space: The Birth and Death of Practically
... viewed end-on rather than a spherical bubble. • The intriguing result implies that the massive star's explosion has produced a shape similar to what is seen in some planetary nebulae associated with lower mass stars. • SMC=190 kly away, so this field of view spans about 150 light-years. ...
... viewed end-on rather than a spherical bubble. • The intriguing result implies that the massive star's explosion has produced a shape similar to what is seen in some planetary nebulae associated with lower mass stars. • SMC=190 kly away, so this field of view spans about 150 light-years. ...
Supernova Stalking - Susanna Kumlien Reportage
... was conducted by Ariel Goobar, another member of the Stockholm team. The discovery made world news, and the eager reader of Loft Bookazine may recall a tidbit on the topic (Volume 1, 2014). The supernova in the galaxy of M82, also known as the Cigar Nebula, proved to be a Type 1a-supernova, a so-cal ...
... was conducted by Ariel Goobar, another member of the Stockholm team. The discovery made world news, and the eager reader of Loft Bookazine may recall a tidbit on the topic (Volume 1, 2014). The supernova in the galaxy of M82, also known as the Cigar Nebula, proved to be a Type 1a-supernova, a so-cal ...
Gamma-ray burst
Gamma-ray bursts (GRBs) are flashes of gamma rays associated with extremely energetic explosions that have been observed in distant galaxies. They are the brightest electromagnetic events known to occur in the universe. Bursts can last from ten milliseconds to several hours. The initial burst is usually followed by a longer-lived ""afterglow"" emitted at longer wavelengths (X-ray, ultraviolet, optical, infrared, microwave and radio).Most observed GRBs are believed to consist of a narrow beam of intense radiation released during a supernova or hypernova as a rapidly rotating, high-mass star collapses to form a neutron star, quark star, or black hole. A subclass of GRBs (the ""short"" bursts) appear to originate from a different process – this may be due to the merger of binary neutron stars. The cause of the precursor burst observed in some of these short events may be due to the development of a resonance between the crust and core of such stars as a result of the massive tidal forces experienced in the seconds leading up to their collision, causing the entire crust of the star to shatter.The sources of most GRBs are billions of light years away from Earth, implying that the explosions are both extremely energetic (a typical burst releases as much energy in a few seconds as the Sun will in its entire 10-billion-year lifetime) and extremely rare (a few per galaxy per million years). All observed GRBs have originated from outside the Milky Way galaxy, although a related class of phenomena, soft gamma repeater flares, are associated with magnetars within the Milky Way. It has been hypothesized that a gamma-ray burst in the Milky Way, pointing directly towards the Earth, could cause a mass extinction event.GRBs were first detected in 1967 by the Vela satellites, a series of satellites designed to detect covert nuclear weapons tests. Hundreds of theoretical models were proposed to explain these bursts in the years following their discovery, such as collisions between comets and neutron stars. Little information was available to verify these models until the 1997 detection of the first X-ray and optical afterglows and direct measurement of their redshifts using optical spectroscopy, and thus their distances and energy outputs. These discoveries, and subsequent studies of the galaxies and supernovae associated with the bursts, clarified the distance and luminosity of GRBs. These facts definitively placed them in distant galaxies and also connected long GRBs with the explosion of massive stars, the only possible source for the energy outputs observed.