The Milky Way Galaxy
... • Surveys of Giant Molecular Clouds (GMCs) are likely to trace the spiral arms since these are sites of star formation • positions interior to Sun’s orbit in Galaxy have some distance ambiguity •Less distance ambiguity outside of Solar orbit, and better evidence of arm-like morphology ...
... • Surveys of Giant Molecular Clouds (GMCs) are likely to trace the spiral arms since these are sites of star formation • positions interior to Sun’s orbit in Galaxy have some distance ambiguity •Less distance ambiguity outside of Solar orbit, and better evidence of arm-like morphology ...
MilkyWay
... • Surveys of Giant Molecular Clouds (GMCs) are likely to trace the spiral arms since these are sites of star formation • positions interior to Sun’s orbit in Galaxy have some distance ambiguity •Less distance ambiguity outside of Solar orbit, and better evidence of arm-like morphology ...
... • Surveys of Giant Molecular Clouds (GMCs) are likely to trace the spiral arms since these are sites of star formation • positions interior to Sun’s orbit in Galaxy have some distance ambiguity •Less distance ambiguity outside of Solar orbit, and better evidence of arm-like morphology ...
Supernova Neutrinos
... for astronomers. SNEWS exists to alert astronomers of a nearby supernova. ...
... for astronomers. SNEWS exists to alert astronomers of a nearby supernova. ...
HOU Supernova Light Curves
... Type II supernovas occur in regions with lots of bright, young stars, such as the spiral arms of galaxies. They apparently do not occur in elliptical galaxies, which are dominated by old, low-mass stars. Since bright young stars are typically stars with masses greater than about 10 times the mass o ...
... Type II supernovas occur in regions with lots of bright, young stars, such as the spiral arms of galaxies. They apparently do not occur in elliptical galaxies, which are dominated by old, low-mass stars. Since bright young stars are typically stars with masses greater than about 10 times the mass o ...
Ch. 25 - UTK Department of Physics and Astronomy
... coming to us from them has probably gone through many interesting regions. We can ...
... coming to us from them has probably gone through many interesting regions. We can ...
The Dynamics of the Galaxies in the Local Group
... Milky Way Future • The Milky Way will merge with the Andromeda galaxy to become an elliptical galaxy – Their collision does not need to be as direct a hit as shown in the movie – They do always approach each other close enough to make a merger inevitable ...
... Milky Way Future • The Milky Way will merge with the Andromeda galaxy to become an elliptical galaxy – Their collision does not need to be as direct a hit as shown in the movie – They do always approach each other close enough to make a merger inevitable ...
Milky Way Galaxy
... The Universe is filled with these star systems which themselves cluster together into larger systems. ...
... The Universe is filled with these star systems which themselves cluster together into larger systems. ...
The Milky Way Galaxy (ch. 23)
... The illustration below shows how the disk and halo stellar populations of our Galaxy are distinct in their spectra, with the halo stars having weaker spectral lines than disk stars of the same temperature (spectral type). Why would this be so?? ...
... The illustration below shows how the disk and halo stellar populations of our Galaxy are distinct in their spectra, with the halo stars having weaker spectral lines than disk stars of the same temperature (spectral type). Why would this be so?? ...
1-structure-of-the-universe-and-the-big-bang
... D) calculations of the temperature and luminosity of stars 33. The explosion associated with the theory and the formation of the universe inferred to have occurred how many billion ago? A) less than 1 B) 2.5 C) 4.6 D) over 10 34. Earth, the Sun, and billions of stars are contained within A) B) C) D) ...
... D) calculations of the temperature and luminosity of stars 33. The explosion associated with the theory and the formation of the universe inferred to have occurred how many billion ago? A) less than 1 B) 2.5 C) 4.6 D) over 10 34. Earth, the Sun, and billions of stars are contained within A) B) C) D) ...
The Milky Way Galaxy is Heading for a Major Cosmic Collision
... Milky Way Future • The Milky will merge with the Andromeda galaxy to become an elliptical galaxy – Their collision does not need to be as direct a hit as shown in the movie – They do always approach each other close enough to make a merger inevitable ...
... Milky Way Future • The Milky will merge with the Andromeda galaxy to become an elliptical galaxy – Their collision does not need to be as direct a hit as shown in the movie – They do always approach each other close enough to make a merger inevitable ...
A Central Engine for Cosmic Gamma
... A CE should be capable of attaining peak power within tens of milliseconds and exhibiting large fluctuations thereafter. The main power emission is often in sub-bursts between which the CE is relatively dormant, typically for about 10 seconds, but sometimes for as long as several 102 seconds or as s ...
... A CE should be capable of attaining peak power within tens of milliseconds and exhibiting large fluctuations thereafter. The main power emission is often in sub-bursts between which the CE is relatively dormant, typically for about 10 seconds, but sometimes for as long as several 102 seconds or as s ...
Syllabus
... Note #2: As indicated above, we will have 9 (nine) lecture exams. Each exam will correspond to one of chapters of the textbook. Note #3: The lowest lecture test grade will be dropped. Note #4: An extra- credit paper will also be available for students for up to an additional 8% of the overall course ...
... Note #2: As indicated above, we will have 9 (nine) lecture exams. Each exam will correspond to one of chapters of the textbook. Note #3: The lowest lecture test grade will be dropped. Note #4: An extra- credit paper will also be available for students for up to an additional 8% of the overall course ...
1 Introduction - High Point University
... Type II supernovae involve very massive stars at the ends of their lives. These stars fuse progressively more massive nuclei in their cores—C, O, Mg, Ne, Si—and finally a core of iron is formed. Since 56 Fe is the most stable nuclei, it is not possible to get any more energy from nuclear fusion and ...
... Type II supernovae involve very massive stars at the ends of their lives. These stars fuse progressively more massive nuclei in their cores—C, O, Mg, Ne, Si—and finally a core of iron is formed. Since 56 Fe is the most stable nuclei, it is not possible to get any more energy from nuclear fusion and ...
1-structure-of-the-universe-and-the-big-bang
... D) calculations of the temperature and luminosity of stars 33. The explosion associated with the theory and the formation of the universe inferred to have occurred how many billion ago? A) less than 1 B) 2.5 C) 4.6 D) over 10 34. Earth, the Sun, and billions of stars are contained within A) B) C) D) ...
... D) calculations of the temperature and luminosity of stars 33. The explosion associated with the theory and the formation of the universe inferred to have occurred how many billion ago? A) less than 1 B) 2.5 C) 4.6 D) over 10 34. Earth, the Sun, and billions of stars are contained within A) B) C) D) ...
UC Davis
... Known sources -- Supernovae & GRBs » Coincidence with observed electromagnetic observations. » No close supernovae occurred during the first science run » Second science run – We are analyzing the recent very bright and close GRB030329 NO RESULT YET ...
... Known sources -- Supernovae & GRBs » Coincidence with observed electromagnetic observations. » No close supernovae occurred during the first science run » Second science run – We are analyzing the recent very bright and close GRB030329 NO RESULT YET ...
the galaxy in which we live - Cosmos
... launched by ESA in 1989. But clearly, conclusions about the large-scale structure and dynamics of our Milky Way need a much deeper and more extensive survey. Gaia, a satellite that the European Space Agency will launch in 2013, will finally be able to solve these questions. Here are some examples: D ...
... launched by ESA in 1989. But clearly, conclusions about the large-scale structure and dynamics of our Milky Way need a much deeper and more extensive survey. Gaia, a satellite that the European Space Agency will launch in 2013, will finally be able to solve these questions. Here are some examples: D ...
Phys 100 – Astronomy (Dr. Ilias Fernini) Review Questions for
... a. searching for single stars that emit large amounts of x-rays. * b. finding x-ray binaries where the compact companion has a mass in excess of 3 M . c. searching for large spherical regions from which no light is detected. d. looking for pulsars with periods less than one millisecond. 64. The mat ...
... a. searching for single stars that emit large amounts of x-rays. * b. finding x-ray binaries where the compact companion has a mass in excess of 3 M . c. searching for large spherical regions from which no light is detected. d. looking for pulsars with periods less than one millisecond. 64. The mat ...
19 The Milky Way Galaxy
... Structure of the Milky Way 1. Select bright objects that you can see throughout the Milky Way and trace their directions and distances. 2. Observe objects at radio and infrared wavelengths to circumvent the problem of optical obscuration, and catalog their directions and distances. 3. Trace the orbi ...
... Structure of the Milky Way 1. Select bright objects that you can see throughout the Milky Way and trace their directions and distances. 2. Observe objects at radio and infrared wavelengths to circumvent the problem of optical obscuration, and catalog their directions and distances. 3. Trace the orbi ...
Slides
... What is the dark matter? Is it just one thing? What is driving the acceleration of the universe? ...
... What is the dark matter? Is it just one thing? What is driving the acceleration of the universe? ...
Copyright © 2010 Pearson Education, Inc. Chapter 13 Neutron Stars
... Neutron Star Binaries These X-ray bursts are thought to originate on neutron stars that have binary partners. The process is very similar to a nova, but much more energy is emitted due to the extremely strong gravitational field of the neutron star. ...
... Neutron Star Binaries These X-ray bursts are thought to originate on neutron stars that have binary partners. The process is very similar to a nova, but much more energy is emitted due to the extremely strong gravitational field of the neutron star. ...
Lecture Notes
... They were discovered in the 1940s by Carl Seyfert and appear as normal spirals, but with very bright nuclei and emit strong non-thermal spectrum. The visible spectrum contains broad (5 000–10 000 km/s) emission lines indicating clouds of gas moving at very high speeds in the nucleus of the galaxy. ∼ ...
... They were discovered in the 1940s by Carl Seyfert and appear as normal spirals, but with very bright nuclei and emit strong non-thermal spectrum. The visible spectrum contains broad (5 000–10 000 km/s) emission lines indicating clouds of gas moving at very high speeds in the nucleus of the galaxy. ∼ ...
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.