the printable Observing Olympics Object Info Sheet in pdf
... nebula has been expanding at a constant rate of 10 milli-arcseconds a year, then it would take 1000 ± 260 years to reach a diameter of 20 arcseconds. This may be an upper limit to the age, because ejected material will be slowed when it encounters material ejected from the star at earlier stages of ...
... nebula has been expanding at a constant rate of 10 milli-arcseconds a year, then it would take 1000 ± 260 years to reach a diameter of 20 arcseconds. This may be an upper limit to the age, because ejected material will be slowed when it encounters material ejected from the star at earlier stages of ...
Spectroscopic confirmation of a galaxy at redshift z=8.6
... emitted by young, massive stars in primeval galaxies ionized the intergalactic medium surrounding their host galaxies, cleared sightlines along which the light of the young galaxies could escape, and fundamentally altered the physical state of the intergalactic gas in the Universe continuously until ...
... emitted by young, massive stars in primeval galaxies ionized the intergalactic medium surrounding their host galaxies, cleared sightlines along which the light of the young galaxies could escape, and fundamentally altered the physical state of the intergalactic gas in the Universe continuously until ...
Publisher: Emily Barrosse Acquisitions Editor: Kelley Tyner
... with a white dwarf. In this section, we will discuss the role of white dwarfs in some of the apparently new stars, novae (pronounced “novee”; the singular form is nova). In the next section, we will see how white dwarfs may also be contributors to even more luminous objects now known as supernovae. ...
... with a white dwarf. In this section, we will discuss the role of white dwarfs in some of the apparently new stars, novae (pronounced “novee”; the singular form is nova). In the next section, we will see how white dwarfs may also be contributors to even more luminous objects now known as supernovae. ...
Powerpoint slides
... diameters away. Galaxies are much closer together than stars, relative to their size. Do not be fooled, however; it is still very difficult to travel between them. You can ask another volunteer to be a photon of light traveling between the two galaxies, but it will take him or her 2 million years to ...
... diameters away. Galaxies are much closer together than stars, relative to their size. Do not be fooled, however; it is still very difficult to travel between them. You can ask another volunteer to be a photon of light traveling between the two galaxies, but it will take him or her 2 million years to ...
Galaxy alignment within dark matter halos
... the DM outer halo than the early-accreted counterparts. Formation time seems useless for ‘galaxy color’, why? (Environment is more important, recycle, quenching) However, due to strong tidal stripping in N-body simulation at halo center, there is no ‘orphan’ galaxies which should be red and carr ...
... the DM outer halo than the early-accreted counterparts. Formation time seems useless for ‘galaxy color’, why? (Environment is more important, recycle, quenching) However, due to strong tidal stripping in N-body simulation at halo center, there is no ‘orphan’ galaxies which should be red and carr ...
Goal: To understand the structure and makeup of our own Milky Way
... have supernovae. • Just behind that you have bubbles from where all the supernovae have merged. • After that you are left with normal stars and normal space which slowly cool until they hit the next spiral arm in a few hundred million years. • With this process, the Milky Way produces about 7 new st ...
... have supernovae. • Just behind that you have bubbles from where all the supernovae have merged. • After that you are left with normal stars and normal space which slowly cool until they hit the next spiral arm in a few hundred million years. • With this process, the Milky Way produces about 7 new st ...
Cygnus X-1
... Cygnus X-1 is one of the most likely candidates as being a black hole. Cygnus X-1 is about 14,000 light years away from earth. So this means that what we are seeing, is many, many, years old. It is a very inconsistent source for X-ray emissions. The emissions of X-rays for Cygnus X-1 flicker in hund ...
... Cygnus X-1 is one of the most likely candidates as being a black hole. Cygnus X-1 is about 14,000 light years away from earth. So this means that what we are seeing, is many, many, years old. It is a very inconsistent source for X-ray emissions. The emissions of X-rays for Cygnus X-1 flicker in hund ...
Xiao Yang Xia
... (2) Star formation rate and accretion rate onto the central BH in IR QSOs at low redshift follow Mbulge- MBH relation, i.e., the ratio of the star formation rate and the accretion rate is about several hundred for IR QSOs, but decreases with the central black hole mass. This shows that the tight cor ...
... (2) Star formation rate and accretion rate onto the central BH in IR QSOs at low redshift follow Mbulge- MBH relation, i.e., the ratio of the star formation rate and the accretion rate is about several hundred for IR QSOs, but decreases with the central black hole mass. This shows that the tight cor ...
in search of antimatter in the universe
... ellipse. One such galaxy is Centaurus A, which is the closest galaxy to us with an AGN jet, at 3.7 Mega parsecs (1 parsec is 3.1x1016 m). This means its jet can be studied in greater detail than is possible in more remote sources. (Figure 5). This has allowed ‘knots’ in the jet to be resolved in x-r ...
... ellipse. One such galaxy is Centaurus A, which is the closest galaxy to us with an AGN jet, at 3.7 Mega parsecs (1 parsec is 3.1x1016 m). This means its jet can be studied in greater detail than is possible in more remote sources. (Figure 5). This has allowed ‘knots’ in the jet to be resolved in x-r ...
PPT - ALFALFA survey
... The galaxies detected in the ADBS exhibit a broad range of HI masses, with a median value of log(MHI) = 9.21 and a tail extending to values below 108 solar masses. ...
... The galaxies detected in the ADBS exhibit a broad range of HI masses, with a median value of log(MHI) = 9.21 and a tail extending to values below 108 solar masses. ...
Determining Distances to Other Galaxies
... position angle of these ellipses vary with radius, a spiral-shaped density wave can be formed from a set of nested ovals. Density wave theory is really based on the premise that mutual gravitational attraction of stars and gas clouds at different radii can offset the spiral’s tendency to wind-up. Th ...
... position angle of these ellipses vary with radius, a spiral-shaped density wave can be formed from a set of nested ovals. Density wave theory is really based on the premise that mutual gravitational attraction of stars and gas clouds at different radii can offset the spiral’s tendency to wind-up. Th ...
All_Stars
... Cluster age = 100 Myr. All lower mass stars have reached the MS, but the stars along the upper half of the MS have all ended their lives. ...
... Cluster age = 100 Myr. All lower mass stars have reached the MS, but the stars along the upper half of the MS have all ended their lives. ...
Physics case for Antares+
... (AGN) are believed to be the most likely origin of the extra-galactic cosmic rays. The observation in TeV gamma rays of the most distant of these objects is severely hampered by absorption, via pair production, on the extragalactic background; possible associated neutrinos would not be affected. 3.1 ...
... (AGN) are believed to be the most likely origin of the extra-galactic cosmic rays. The observation in TeV gamma rays of the most distant of these objects is severely hampered by absorption, via pair production, on the extragalactic background; possible associated neutrinos would not be affected. 3.1 ...
Lecture 13 Local group chapter 4 of S+G
... which are dwarf ellipticals and irregulars with low mass; most are satellites of MW, M31 or M33 The gravitational interaction between these systems is complex but the local group is apparently bound. Major advantages – close and bright- all nearby enough that individual stars can be well measured as ...
... which are dwarf ellipticals and irregulars with low mass; most are satellites of MW, M31 or M33 The gravitational interaction between these systems is complex but the local group is apparently bound. Major advantages – close and bright- all nearby enough that individual stars can be well measured as ...
SUMMARY White dwarfs, neutron stars, and black holes are the
... Thinking about how the speed of stellar evolution relates to the mass of the stars, and about what happens when novas occur, can you explain how you might have a binary system with an 8solar mass blue mainsequence star and a 1solarmass white dwarf? ...
... Thinking about how the speed of stellar evolution relates to the mass of the stars, and about what happens when novas occur, can you explain how you might have a binary system with an 8solar mass blue mainsequence star and a 1solarmass white dwarf? ...
A Chandra Observation of the Massive Star-Forming
... from an evaporating gaseous globule (EGG) for the first time A significant population of X-ray emitting low mass stars (~700) detected, increasing the cluster known members by a factor of 40 ...
... from an evaporating gaseous globule (EGG) for the first time A significant population of X-ray emitting low mass stars (~700) detected, increasing the cluster known members by a factor of 40 ...
Low-Res Version - Chandra X
... sun. Its mass has been estimated at 120 times the mass of our sun, making it a candidate for the most massive known star in our galaxy. The Chandra observation shows three distinct structures: an outer, horseshoe-shaped ring associated with a shock wave from matter blown away from the star about 200 ...
... sun. Its mass has been estimated at 120 times the mass of our sun, making it a candidate for the most massive known star in our galaxy. The Chandra observation shows three distinct structures: an outer, horseshoe-shaped ring associated with a shock wave from matter blown away from the star about 200 ...
Galaxy Hunters Article, Cosmology Information, First Star Facts
... largest meetings ever devoted to the origin of galaxies. The first star was born about 14 billion years ago, Abel believes, in a universe that was more mysterious but also far simpler than our own. Smaller and denser than today, the universe was pitch-black and contained mostly hydrogen and helium w ...
... largest meetings ever devoted to the origin of galaxies. The first star was born about 14 billion years ago, Abel believes, in a universe that was more mysterious but also far simpler than our own. Smaller and denser than today, the universe was pitch-black and contained mostly hydrogen and helium w ...
Document
... winter of 1984 and completed over the next ten years. In this map of the survey, the redshifts of about 18,000 galaxies are measured in the northern sky out to v = 12,000 km/s (equivalent to z = 0.04). The z-axis into the plane represents a cylindrical height in redshift space also of v = 12,000 km/ ...
... winter of 1984 and completed over the next ten years. In this map of the survey, the redshifts of about 18,000 galaxies are measured in the northern sky out to v = 12,000 km/s (equivalent to z = 0.04). The z-axis into the plane represents a cylindrical height in redshift space also of v = 12,000 km/ ...
Galaxy Powerpoint Notes
... II. Spiral Galaxy : II. Spiral Galaxy The appearance of spiral galaxies are very easy to distinguish. They feature a shape that looks like a disk that usually has a bulge in the center and with arms that spiral outwards as the galaxy rotates. The most common spiral galaxies in our universe are the M ...
... II. Spiral Galaxy : II. Spiral Galaxy The appearance of spiral galaxies are very easy to distinguish. They feature a shape that looks like a disk that usually has a bulge in the center and with arms that spiral outwards as the galaxy rotates. The most common spiral galaxies in our universe are the M ...
Lect16-3-28-and-30-1..
... opposite rings Burrows found a common center. However, it is offset from the heart of the supernova ejecta. When Burrows did a detailed inspection of the HST image, he found a dim object which may be the source of the beam at the predicted location. The object is about 1/3 light-year from the center ...
... opposite rings Burrows found a common center. However, it is offset from the heart of the supernova ejecta. When Burrows did a detailed inspection of the HST image, he found a dim object which may be the source of the beam at the predicted location. The object is about 1/3 light-year from the center ...
STEPHAN`S QUINTET
... Stephan's Quintet in the constellation Pegasus is al grouping of five galaxies of which four form the first compact galaxy group ever discovered. The group was discovered by Édouard Stephan in 1877 at Marseilles Observatory. These galaxies are of interest because of their violent collisions. Four of ...
... Stephan's Quintet in the constellation Pegasus is al grouping of five galaxies of which four form the first compact galaxy group ever discovered. The group was discovered by Édouard Stephan in 1877 at Marseilles Observatory. These galaxies are of interest because of their violent collisions. Four of ...
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.