Tools of Astronomy - Indiana University Astronomy
... X-ray mirrors are precisely shaped and aligned to incoming x-rays. They look more like barrels than the familiar dish mirrors of optical telescopes. ...
... X-ray mirrors are precisely shaped and aligned to incoming x-rays. They look more like barrels than the familiar dish mirrors of optical telescopes. ...
Exploring the Variable Sky with the Catalina Real-Time
... ~ 150 pc from the AGN No morphological indications of star forming regions outside of the unresolved nucleus Vicinity of an AGN is not conducive to star formation, except… … near the outer edge of the accretion disk, which is shielded from the UVX radiation, and should be violently unstable ...
... ~ 150 pc from the AGN No morphological indications of star forming regions outside of the unresolved nucleus Vicinity of an AGN is not conducive to star formation, except… … near the outer edge of the accretion disk, which is shielded from the UVX radiation, and should be violently unstable ...
The Milky Way: Spiral galaxies:
... •! We can perform a bulge/disk decomposition. •! And calculate bulge to disk and bulge to total ratios (by integrating exponential and r1/4-laws as in the problem set!) •! We find that B/D decreases along the Hubble ...
... •! We can perform a bulge/disk decomposition. •! And calculate bulge to disk and bulge to total ratios (by integrating exponential and r1/4-laws as in the problem set!) •! We find that B/D decreases along the Hubble ...
DTU_9e_ch15
... More than a million stars in the disk of our Galaxy fill this view, which covers a relatively clear window just 4° south of the galactic nucleus in Sagittarius. Beyond the disk stars you can see two prominent globular clusters. Although most regions of the sky toward Sagittarius are thick with dust, ...
... More than a million stars in the disk of our Galaxy fill this view, which covers a relatively clear window just 4° south of the galactic nucleus in Sagittarius. Beyond the disk stars you can see two prominent globular clusters. Although most regions of the sky toward Sagittarius are thick with dust, ...
Chapter 16
... 1. The Galaxy began as a tremendous cloud of gas and dust bigger than the present Galactic halo. Mutual gravitation between the cloud’s parts pulled it together. 2. The center portion was the first to become dense enough for stars to form. Dense pockets in orbit around the center became globular clu ...
... 1. The Galaxy began as a tremendous cloud of gas and dust bigger than the present Galactic halo. Mutual gravitation between the cloud’s parts pulled it together. 2. The center portion was the first to become dense enough for stars to form. Dense pockets in orbit around the center became globular clu ...
harvest09b - NMSU Astronomy
... OUTFLOWS expected to be most common in the redshift desert, where star formation is most active We directly observe the IGM enrichment process when it is peaking We directly observe the interplay (fueling by infall and outflow mass loss) between galaxy evolution and the baryonic environment in the ...
... OUTFLOWS expected to be most common in the redshift desert, where star formation is most active We directly observe the IGM enrichment process when it is peaking We directly observe the interplay (fueling by infall and outflow mass loss) between galaxy evolution and the baryonic environment in the ...
81 KB - CSIRO Publishing
... transition cases that might share common properties. Hopefully this results in additional insight into the physical processes that are operating. Perhaps the most famous recent case of classification in astronomy is the International Astronomical Union’s definition of a planet and its separation on ...
... transition cases that might share common properties. Hopefully this results in additional insight into the physical processes that are operating. Perhaps the most famous recent case of classification in astronomy is the International Astronomical Union’s definition of a planet and its separation on ...
Word version of Episode 704
... Finding the Andromeda galaxy M31 The Andromeda galaxy M31 can just, but only just, be seen with the naked eye. Its light, 2 million years old, is the oldest light you can see with the unaided eye. The Andromeda galaxy, M31, is the nearest neighbour large galaxy to our own Galaxy, the Milky Way. It i ...
... Finding the Andromeda galaxy M31 The Andromeda galaxy M31 can just, but only just, be seen with the naked eye. Its light, 2 million years old, is the oldest light you can see with the unaided eye. The Andromeda galaxy, M31, is the nearest neighbour large galaxy to our own Galaxy, the Milky Way. It i ...
Summary Of the Structure of the Milky Way
... nature of the Milky Way galaxy, but are not “deep” enough probes to fully reveal the structure of the Milky Way. • Open clusters can define the thickness of the Milky Way’s thin disk where star formation is active. • Globular clusters allow astronomers to know the direction to the center of our gala ...
... nature of the Milky Way galaxy, but are not “deep” enough probes to fully reveal the structure of the Milky Way. • Open clusters can define the thickness of the Milky Way’s thin disk where star formation is active. • Globular clusters allow astronomers to know the direction to the center of our gala ...
astronomy advisory panel strategy
... Understanding the birth of stars is fundamental to astrophysics. Any realistic explanation of the formation and evolution of galaxies requires us to know what determines the rate of star formation, what determines any variation in the mass distribution of stars formed, and what determines the charac ...
... Understanding the birth of stars is fundamental to astrophysics. Any realistic explanation of the formation and evolution of galaxies requires us to know what determines the rate of star formation, what determines any variation in the mass distribution of stars formed, and what determines the charac ...
Introduction to Galaxies - West Jefferson Local Schools
... • orbits of stars and gas are “circular”, rotating about disk axis • star formation is on-going; it is can be fairly constant over the age of the galaxy • gas and dust mass fraction is roughly 10-50% of full disk • due on-going star formation, ages of stars widely range from age of galaxy to new • s ...
... • orbits of stars and gas are “circular”, rotating about disk axis • star formation is on-going; it is can be fairly constant over the age of the galaxy • gas and dust mass fraction is roughly 10-50% of full disk • due on-going star formation, ages of stars widely range from age of galaxy to new • s ...
Save the Sky: Adventures in Sky Monitoring
... Most complete light curves for hundreds of bright variable stars starting from May 2000, when the first CONCAM was deployed on Kitt Peak. First devices to give real-time optical ground truth for the whole sky in support of major astronomical telescopes, including Gemini North, Keck, Subaru, IRTF, Sp ...
... Most complete light curves for hundreds of bright variable stars starting from May 2000, when the first CONCAM was deployed on Kitt Peak. First devices to give real-time optical ground truth for the whole sky in support of major astronomical telescopes, including Gemini North, Keck, Subaru, IRTF, Sp ...
The Fundamental Plane, Stellar Popula6ons
... What is the relaBon between stellar mass and dynamical mass, and how does this vary with parent halo mass & environment? How do the observed trends in stellar populaBons vary with environment (NN/local density/cluster radius/cluster richness)? What is origin of the ‘Blt’ of the FP and its ...
... What is the relaBon between stellar mass and dynamical mass, and how does this vary with parent halo mass & environment? How do the observed trends in stellar populaBons vary with environment (NN/local density/cluster radius/cluster richness)? What is origin of the ‘Blt’ of the FP and its ...
Galaxies - University of Iowa Astrophysics
... A) They all have the same distance. B) Their luminosity can be determined from their pulsation period. C) They all have the same luminosity. D) They all have the same radius. ...
... A) They all have the same distance. B) Their luminosity can be determined from their pulsation period. C) They all have the same luminosity. D) They all have the same radius. ...
Wednesday, Sept. 24 - Department of Physics and Astronomy
... • For peak of the black body curve to change colour, star would need to travel at least 10,000 km/s. Within our Milky Way Galaxy most stars orbit at a speed of 220 km/s. Even nearby galaxies – which I am showing detailed images of - are moving at only a few thousand km/s. ...
... • For peak of the black body curve to change colour, star would need to travel at least 10,000 km/s. Within our Milky Way Galaxy most stars orbit at a speed of 220 km/s. Even nearby galaxies – which I am showing detailed images of - are moving at only a few thousand km/s. ...
2 Galaxy morphology and classification
... The spheroid is the smooth elliptical distribution of stars found in elliptical galaxies. It is composed primarily of an old, metal-poor, population of stars typically having ages „ 12 Gyr or more. The spheroid is thought to be among the first stellar components to form. The stellar halo is a di↵use ...
... The spheroid is the smooth elliptical distribution of stars found in elliptical galaxies. It is composed primarily of an old, metal-poor, population of stars typically having ages „ 12 Gyr or more. The spheroid is thought to be among the first stellar components to form. The stellar halo is a di↵use ...
Spiral galaxies: Spiral galaxies: Inclination Spiral galaxies: Internal
... Galaxies in Ursa Major -- HI gas fraction is larger for fainter galaxies ...
... Galaxies in Ursa Major -- HI gas fraction is larger for fainter galaxies ...
Absolute magnitude of type Ia supernovae
... Research on the Relation between Type Ia Supernova’s Brightness and Galaxy’s Distance 1 Supernovae are violent phenomena in which runaway of thermonuclear fusion causes whole star’s explosion. In spite of calling a supernova as “a new star”, this phenomenon occurs at the last stage of a star’s evolu ...
... Research on the Relation between Type Ia Supernova’s Brightness and Galaxy’s Distance 1 Supernovae are violent phenomena in which runaway of thermonuclear fusion causes whole star’s explosion. In spite of calling a supernova as “a new star”, this phenomenon occurs at the last stage of a star’s evolu ...
Document
... 2. Microlensing on isolated stellar mass BHs • There are several good candidates • But it is necessary to find the black hole ITSELF! 3. Exotic emission mechanisms • As all other exotics: interesting, but not very probable • If it works, then GLAST will show us isolated BHs 4. Runaway stars • A rare ...
... 2. Microlensing on isolated stellar mass BHs • There are several good candidates • But it is necessary to find the black hole ITSELF! 3. Exotic emission mechanisms • As all other exotics: interesting, but not very probable • If it works, then GLAST will show us isolated BHs 4. Runaway stars • A rare ...
Astro 6590: Galaxies and the Universe Astro
... 4. The luminosity function (LF) of galaxies is distinctly nonGaussian with a long tail extending to low luminosities. 5. There are large peaks in the density distribution of matter and these in turn surround the visible portions of galaxies. • Dark matter! ...
... 4. The luminosity function (LF) of galaxies is distinctly nonGaussian with a long tail extending to low luminosities. 5. There are large peaks in the density distribution of matter and these in turn surround the visible portions of galaxies. • Dark matter! ...
18_Testbank - Lick Observatory
... C) because the current evidence suggests that they are the most powerful bursts of energy that ever occur anywhere in the universe, but we don't know how they are produced D) because current evidence suggests that they come from our own Milky Way, but we have no idea where in the Milky Way they occu ...
... C) because the current evidence suggests that they are the most powerful bursts of energy that ever occur anywhere in the universe, but we don't know how they are produced D) because current evidence suggests that they come from our own Milky Way, but we have no idea where in the Milky Way they occu ...
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.