Active Galactic Nuclei
... they have very high luminosities ~ 1011Lo which is 1000 times more luminous than a normal spiral galaxy. ...
... they have very high luminosities ~ 1011Lo which is 1000 times more luminous than a normal spiral galaxy. ...
Dust and Molecules in Early Galaxies
... 2. If the metallicity of the cloud is low (Z ~ 0.01 Zsun), dust extinction is expected to be so weak that 17 and 28mm lines are detectable by SPICA for objects at z < 5. Small very high-z population III objects will be detected by ALMA. 3. By this method, we can trace back the dynamical evolution of ...
... 2. If the metallicity of the cloud is low (Z ~ 0.01 Zsun), dust extinction is expected to be so weak that 17 and 28mm lines are detectable by SPICA for objects at z < 5. Small very high-z population III objects will be detected by ALMA. 3. By this method, we can trace back the dynamical evolution of ...
Dark Matter in the Universe
... meters (81 miles) per second. As eager spectators, we must it. For every gram of glowing material we can detect, watch this encounter for a few decades to know if M31 will strike our galaxy or merely slide by. If they do collide, we will there may be tens of grams of dark matter out there. Currently ...
... meters (81 miles) per second. As eager spectators, we must it. For every gram of glowing material we can detect, watch this encounter for a few decades to know if M31 will strike our galaxy or merely slide by. If they do collide, we will there may be tens of grams of dark matter out there. Currently ...
The Milky Way and Dark Matter
... 4. What observations have provided evidence that dark matter is present in spiral galaxies? 5. What kinds of objects have scientists eliminated as possible candidates for dark matter? 6. What are these things called WIMPs? Reinforcing Activity We will now do a demonstration to show how this works. M ...
... 4. What observations have provided evidence that dark matter is present in spiral galaxies? 5. What kinds of objects have scientists eliminated as possible candidates for dark matter? 6. What are these things called WIMPs? Reinforcing Activity We will now do a demonstration to show how this works. M ...
Weighing a Galaxy—11 Nov Ast 207 F2005 Nov-09 • Schedule
... 2. The amount of helium in the sun depends on the properties of deuterium. If deuterium is less tightly bound, would there be more or less helium on the surface of the sun? ...
... 2. The amount of helium in the sun depends on the properties of deuterium. If deuterium is less tightly bound, would there be more or less helium on the surface of the sun? ...
Linking Gas Fractions to Bimodalities in Galaxy Properties
... 107 M⊙ than to 1010 M⊙ (Mac Low & Ferrara 1999). Coldmode gas accretion may dominate in low-mass halos whose gas fails to shock to the virial temperature (Birnboim & Dekel 2003; Katz et al. 2003); here analytic estimates give a threshold mass of a few times 1011 M⊙ including dark matter, so a link t ...
... 107 M⊙ than to 1010 M⊙ (Mac Low & Ferrara 1999). Coldmode gas accretion may dominate in low-mass halos whose gas fails to shock to the virial temperature (Birnboim & Dekel 2003; Katz et al. 2003); here analytic estimates give a threshold mass of a few times 1011 M⊙ including dark matter, so a link t ...
1. INTRODUCTION 2. MASS AND LIGHT
... 2. The argument of ° 2 fails because the intervening structures happen to be contained within 5¡ of the LMC center (although they must extend over at least the inner D3¡ to account for the observed events). This possibility could only apply to a self-gravitating structure and not to an intrinsically ...
... 2. The argument of ° 2 fails because the intervening structures happen to be contained within 5¡ of the LMC center (although they must extend over at least the inner D3¡ to account for the observed events). This possibility could only apply to a self-gravitating structure and not to an intrinsically ...
3rd EXAM VERSION A key - Department of Physics and Astronomy
... D. The immense radiation output from the quasar carries away energy. The mass of the black hole gets smaller until it evaporates. 28. Observations indicate that blazers are A. quasars that have absorbed or merged with a smaller galaxy within a cluster B. distant spiral galaxies undergoing an intense ...
... D. The immense radiation output from the quasar carries away energy. The mass of the black hole gets smaller until it evaporates. 28. Observations indicate that blazers are A. quasars that have absorbed or merged with a smaller galaxy within a cluster B. distant spiral galaxies undergoing an intense ...
n - Ira-Inaf
... Warm Ionized Medium (WIM) [T ~ 104 K]: – Around massive and hot stars (OB) capable of strong UV emission (also around galactic centres, where the UV radiation field is strong). OB associations are very often found in SFR (e.g. Orion). – Equilibrium between photo – ionization and recombin ...
... Warm Ionized Medium (WIM) [T ~ 104 K]: – Around massive and hot stars (OB) capable of strong UV emission (also around galactic centres, where the UV radiation field is strong). OB associations are very often found in SFR (e.g. Orion). – Equilibrium between photo – ionization and recombin ...
Stellar Evolution - Lick Observatory
... • In the case of the Sun (or any 1Mo star) the gradual increase in radius and luminosity will continue for another 5 billion years. • While hydrogen fusion is the dominant energy source, there is a useful thermostat operating. If the Sun contracted and heated up, the fusion rates would increase and ...
... • In the case of the Sun (or any 1Mo star) the gradual increase in radius and luminosity will continue for another 5 billion years. • While hydrogen fusion is the dominant energy source, there is a useful thermostat operating. If the Sun contracted and heated up, the fusion rates would increase and ...
Sirius Astronomer - Orange County Astronomers
... observations than any previous one. Of the others, one (Borrelley) is similarly shaped, and Halley is roughly similar, usually being called peanut-shaped. The Deep Impact spacecraft was reused for this mission, after completing its flyby and impact (of a separate projectile) at comet Tempel 1. The r ...
... observations than any previous one. Of the others, one (Borrelley) is similarly shaped, and Halley is roughly similar, usually being called peanut-shaped. The Deep Impact spacecraft was reused for this mission, after completing its flyby and impact (of a separate projectile) at comet Tempel 1. The r ...
Chapter 16 - "The Universe"
... – The second stage begins when the hydrogen core becomes fused to produce helium. • As there are now less hydrogen fusion reactions, less energy is produced, which means less outward pressure, so the star begins to collapse due to gravitational pull. • This collapse begins to heat the helium core o ...
... – The second stage begins when the hydrogen core becomes fused to produce helium. • As there are now less hydrogen fusion reactions, less energy is produced, which means less outward pressure, so the star begins to collapse due to gravitational pull. • This collapse begins to heat the helium core o ...
Chapter 13: Interstellar Matter and Star Formation
... 1. The observed dark areas in the sky are caused by giant clouds of interstellar dust that block light from stars behind them. 2. In the 1930s, astronomers became aware that grains of dust exist throughout space. Interstellar cirrus clouds are faint, diffuse dust clouds found throughout interstellar ...
... 1. The observed dark areas in the sky are caused by giant clouds of interstellar dust that block light from stars behind them. 2. In the 1930s, astronomers became aware that grains of dust exist throughout space. Interstellar cirrus clouds are faint, diffuse dust clouds found throughout interstellar ...
May 2015 - Hermanus Astronomy
... however, is a late ‘boomer’. The Milky Way’s star-birthing frenzy peaked 10 billion years ago, but our Sun was late for the party, not forming until roughly 5 billion years ago. By that time, the star formation rate in our galaxy had plunged to a trickle. Missing the party, however, may not have bee ...
... however, is a late ‘boomer’. The Milky Way’s star-birthing frenzy peaked 10 billion years ago, but our Sun was late for the party, not forming until roughly 5 billion years ago. By that time, the star formation rate in our galaxy had plunged to a trickle. Missing the party, however, may not have bee ...
Using AO to Measure the Star Formation Histories of Massive Galaxies
... Can study entire star formation history from its resolved stars Complementary to studies of galaxies with z > 0.5, which are limited to integrated broadband photometry or IFU spectroscopy ...
... Can study entire star formation history from its resolved stars Complementary to studies of galaxies with z > 0.5, which are limited to integrated broadband photometry or IFU spectroscopy ...
Star Birth
... Where do new stars form? What steps are involved in forming a star like the Sun? When a star forms, why does it end up with only a fraction of the available matter? What do star clusters tell us about the formation of stars? Where in the Galaxy does star formation take place? How can the death of on ...
... Where do new stars form? What steps are involved in forming a star like the Sun? When a star forms, why does it end up with only a fraction of the available matter? What do star clusters tell us about the formation of stars? Where in the Galaxy does star formation take place? How can the death of on ...
AGN in hierarchical galaxy formation models
... • We have developed a model using GALFORM for explaining the radio loudness of AGN in hierarchical cosmological models. • We find that in the present universe SMBHs have a bimodal distribution of spins. • Giant ellipticals are found to host massive SMBHs (MBH>108Msun) that rotate rapidly, which c ...
... • We have developed a model using GALFORM for explaining the radio loudness of AGN in hierarchical cosmological models. • We find that in the present universe SMBHs have a bimodal distribution of spins. • Giant ellipticals are found to host massive SMBHs (MBH>108Msun) that rotate rapidly, which c ...
Document
... neutrons worth of 2-3 solar masses. Some neutron stars spin rapidly and are detectable via their magnetic field direction. These are known as pulsars. 12. Even more massive stars can collapse to form a black hole– the gravity is so high that even the pressure from degenerate neutrons can not balance ...
... neutrons worth of 2-3 solar masses. Some neutron stars spin rapidly and are detectable via their magnetic field direction. These are known as pulsars. 12. Even more massive stars can collapse to form a black hole– the gravity is so high that even the pressure from degenerate neutrons can not balance ...
Background Science - Faulkes Telescope Project
... surface, until it becomes unstable. The enormous explosion from these stars ejects material into the surroundings at very high velocities, sweeping up the surrounding gas into a shell or a giant bubble. This is known as a supernova remnant. The ejected material and the swept-up compressed gas are ve ...
... surface, until it becomes unstable. The enormous explosion from these stars ejects material into the surroundings at very high velocities, sweeping up the surrounding gas into a shell or a giant bubble. This is known as a supernova remnant. The ejected material and the swept-up compressed gas are ve ...
Weighing a Galaxy15 Nov 11/15/2010
... To find mass of sun, measure period T & size R of a planet’s orbit. Kepler’s 3rd Law: M = R3 / T2 for R in AU, T in years, and M in solar masses. ...
... To find mass of sun, measure period T & size R of a planet’s orbit. Kepler’s 3rd Law: M = R3 / T2 for R in AU, T in years, and M in solar masses. ...
An analogy
... – more peculiar galaxies are observed: could be due to patchy star formation (younger age) or to interactions being more frequent (denser Universe) – resolution is poor compared to local galaxies and usually limited to a few bandpasses, and not necessarily those observed for nearby galaxies – select ...
... – more peculiar galaxies are observed: could be due to patchy star formation (younger age) or to interactions being more frequent (denser Universe) – resolution is poor compared to local galaxies and usually limited to a few bandpasses, and not necessarily those observed for nearby galaxies – select ...
Stellar Evolution - University of California, Santa Cruz
... emission line that originally could not be identified with any known atoms. It was proposed that a new element, `nebulium’ was the source. • It was subsequently realized to come from a socalled `forbidden’ transition in oxygen atoms. The energy states are not truly forbidden, but only long-lived (ho ...
... emission line that originally could not be identified with any known atoms. It was proposed that a new element, `nebulium’ was the source. • It was subsequently realized to come from a socalled `forbidden’ transition in oxygen atoms. The energy states are not truly forbidden, but only long-lived (ho ...
Handout from Allaire Star Party
... Open clusters are also clusters of stars, but they are much smaller and younger than globular clusters. A typical open cluster might contain anywhere from less than 10 to more than 10,000 stars in an area about 50-100 light years across. When comparing these to globular clusters, which can have over ...
... Open clusters are also clusters of stars, but they are much smaller and younger than globular clusters. A typical open cluster might contain anywhere from less than 10 to more than 10,000 stars in an area about 50-100 light years across. When comparing these to globular clusters, which can have over ...
Great Migrations & other natural history tales
... PPM simulation (Piecewise Parabolic Method) VH-1 code Owen, Blondin et al. ...
... PPM simulation (Piecewise Parabolic Method) VH-1 code Owen, Blondin et al. ...