Last Year`s Exam, Section B
... of stellar structure), what could astronomers on Earth learn about this system? In your answer you should consider properties of the star, e.g. mass, temperature, chemical composition, and properties of its planetary system. If you make any extra assumptions about the system, e.g. its location or or ...
... of stellar structure), what could astronomers on Earth learn about this system? In your answer you should consider properties of the star, e.g. mass, temperature, chemical composition, and properties of its planetary system. If you make any extra assumptions about the system, e.g. its location or or ...
Lecture 14 - Center for Astrophysics and Space Astronomy CASA
... We now see a dozen or so every year in distant galaxies. ...
... We now see a dozen or so every year in distant galaxies. ...
pptx
... the Sun’s mass, then its mass is 10 M, which is read as “10 solar masses”. If a star has radius that is 1/5 of the Sun’s radius, than that radius is written as 0.2 R, or “0.2 solar radii”. ...
... the Sun’s mass, then its mass is 10 M, which is read as “10 solar masses”. If a star has radius that is 1/5 of the Sun’s radius, than that radius is written as 0.2 R, or “0.2 solar radii”. ...
closed-box model
... Whenever such a discrepancy arises we need to turn to the assumptions that have been made to see which one could have been incorrect. In this case, one of the critical assumptions made was that the initial gas was metal-free. – If we, for example, assume there was some initial pre-enrichment in the ...
... Whenever such a discrepancy arises we need to turn to the assumptions that have been made to see which one could have been incorrect. In this case, one of the critical assumptions made was that the initial gas was metal-free. – If we, for example, assume there was some initial pre-enrichment in the ...
Formation of ellipticals: Merging with or without star formation?
... All the scaling relations must be explained by a consistent formation scenario. Focussing on a subset of scaling relations may easily lead to wrong conclusions, such as that dissipationless merging is a possible way to form Es. ...
... All the scaling relations must be explained by a consistent formation scenario. Focussing on a subset of scaling relations may easily lead to wrong conclusions, such as that dissipationless merging is a possible way to form Es. ...
PowerPoint file - Northwest Creation Network
... observational indication of conformation. Thus the ‘generally accepted’ theory of stellar formation may be one of a hundred unsupported dogmas which constitute a large part of present-day astrophysics.” ...
... observational indication of conformation. Thus the ‘generally accepted’ theory of stellar formation may be one of a hundred unsupported dogmas which constitute a large part of present-day astrophysics.” ...
z - STScI
... after the Big Bang (to z ~ 5.6) – New stars appear to be forming at roughly a constant rate until very recently (1 < z < 5) – SCUBA may have detected a significant component of dust-hidden star formation at cosmological distances ...
... after the Big Bang (to z ~ 5.6) – New stars appear to be forming at roughly a constant rate until very recently (1 < z < 5) – SCUBA may have detected a significant component of dust-hidden star formation at cosmological distances ...
Star Formation: Interstellar Gas and Dust
... • Pressure support from below = gravitational attraction towards center • But following exhaustion of H fuel in center: No further nuclear burning Î Temperature drops Î Pressure drops Î Core contracts • Core contraction releases gravitational energy • So center heats up • But never enough to maintai ...
... • Pressure support from below = gravitational attraction towards center • But following exhaustion of H fuel in center: No further nuclear burning Î Temperature drops Î Pressure drops Î Core contracts • Core contraction releases gravitational energy • So center heats up • But never enough to maintai ...
Age patterns in a sample of spiral galaxies
... dominant) spiral arms. Spatial variation in the current SFR and SFH across a galaxy can provide vital clues to its dynamical and secular evolution. ...
... dominant) spiral arms. Spatial variation in the current SFR and SFH across a galaxy can provide vital clues to its dynamical and secular evolution. ...
1 Star Formation and Main Sequence Evolution Condensation
... but fragments into clumps with a range of masses ...
... but fragments into clumps with a range of masses ...
The Milky Way
... galaxy C) Spiral arms contain a very high density of less than one solar mass stars D) Stars preferentially form in spiral arms ...
... galaxy C) Spiral arms contain a very high density of less than one solar mass stars D) Stars preferentially form in spiral arms ...
Chapter 19. Mapping the Universe from Herschel to Sloan
... a rather nearby cluster of stars, within the boundaries of the Milky Way Galaxy or whether they were supergiants in a distant stellar system. If distant, then the size of these systems of stars would rival or exceed the size of our own galaxy! The key to getting the distance to these systems came fr ...
... a rather nearby cluster of stars, within the boundaries of the Milky Way Galaxy or whether they were supergiants in a distant stellar system. If distant, then the size of these systems of stars would rival or exceed the size of our own galaxy! The key to getting the distance to these systems came fr ...
Hubble’s Law & Black Holes at a Galaxy’s Center
... Black Hole at the Center of the Milky Way Galaxy ...
... Black Hole at the Center of the Milky Way Galaxy ...
The MGC - St Andrews Astronomy Group
... • The MGC-BRIGHT is re-calibrating our insight into the local universe • Interpretation of faint galaxy counts and N(z)s is fundamentally flawed until local information is refined • Morphology represents a new research avenue • Elliptical counts could constrain Lambda, if other errors are minimal • ...
... • The MGC-BRIGHT is re-calibrating our insight into the local universe • Interpretation of faint galaxy counts and N(z)s is fundamentally flawed until local information is refined • Morphology represents a new research avenue • Elliptical counts could constrain Lambda, if other errors are minimal • ...
VNGS_april2014v2 - McMaster Physics and Astronomy
... • Temperature versus density (left) and pressure (right) • Blue = cold gas • Red = warm gas • CO+CI solutions ...
... • Temperature versus density (left) and pressure (right) • Blue = cold gas • Red = warm gas • CO+CI solutions ...
A Universe of Galaxies - Pennsylvania State University
... What can outshine ~1000 supernovae for millions of years, and be just slightly larger than our Solar System? Theoretically, not much – only a very, very big black hole. • Start with a black hole with a mass of 10,000,000,000 Mʘ • Have a star come close enough to be tidally disrupted • Have the mater ...
... What can outshine ~1000 supernovae for millions of years, and be just slightly larger than our Solar System? Theoretically, not much – only a very, very big black hole. • Start with a black hole with a mass of 10,000,000,000 Mʘ • Have a star come close enough to be tidally disrupted • Have the mater ...
Measuring large distances
... around an intervening galaxy by the curvature of space, and follow 2 distinct paths to the Earth. By tracking both paths exactly, an estimate can be made of the distance of the “lensing” galaxy. ...
... around an intervening galaxy by the curvature of space, and follow 2 distinct paths to the Earth. By tracking both paths exactly, an estimate can be made of the distance of the “lensing” galaxy. ...
Test#4
... d) a rapidly evolving black hole 28. Black holes a) created by science fiction writers b) the result of stars too massive for neutrons to support them c) condensed molecular clouds before star formation takes place d) small dark spot seen on the surface of the Sun 29. It is unlikely that astronauts ...
... d) a rapidly evolving black hole 28. Black holes a) created by science fiction writers b) the result of stars too massive for neutrons to support them c) condensed molecular clouds before star formation takes place d) small dark spot seen on the surface of the Sun 29. It is unlikely that astronauts ...
Lecture 1, PPT version
... Like the Milky Way, M31 is a spiral galaxy where most of the stars reside in a thin disk. The sun resides in the outer reaches of the Milky Way’s disk. Any idea where all the stars you see around M31 are actually located? ...
... Like the Milky Way, M31 is a spiral galaxy where most of the stars reside in a thin disk. The sun resides in the outer reaches of the Milky Way’s disk. Any idea where all the stars you see around M31 are actually located? ...
Lectures 7
... (p is the momentum of the particle, B the magnetic field, q the charge) In handier units r=3.3x107γ/B(gauss)cm ; γ is the relativistic factor sqrt(1/(1-v2/c2)) With B~5uG the gyroradius of a proton with γ~104 (a typical value) is ~10-4 pc. so cosmic rays are trapped within the Galaxy by the magnetic ...
... (p is the momentum of the particle, B the magnetic field, q the charge) In handier units r=3.3x107γ/B(gauss)cm ; γ is the relativistic factor sqrt(1/(1-v2/c2)) With B~5uG the gyroradius of a proton with γ~104 (a typical value) is ~10-4 pc. so cosmic rays are trapped within the Galaxy by the magnetic ...
PHYSICS 1500 - ASTRONOMY TOTAL: 100 marks Section A Please
... (a) regions in the interstellar medium comprised of twice-ionised hydrogen. (b) regions in the interstellar medium comprised of molecular hydrogen. (c) regions in the interstellar medium detected by the observing the 21 cm (1420 MHz) radio signal. (d) emission nebulae in which hydrogen is ionised by ...
... (a) regions in the interstellar medium comprised of twice-ionised hydrogen. (b) regions in the interstellar medium comprised of molecular hydrogen. (c) regions in the interstellar medium detected by the observing the 21 cm (1420 MHz) radio signal. (d) emission nebulae in which hydrogen is ionised by ...
Giant molecular clouds: star factories
... compared to cosmological simulations, but how the galaxy forms, galaxy mergers and accretion of gas onto the galaxy are neglected. However, generally the timescales (hundreds of Myrs) of the simulations are quite short, so neglecting these processes is reasonable. Spiral galaxies generally fall into ...
... compared to cosmological simulations, but how the galaxy forms, galaxy mergers and accretion of gas onto the galaxy are neglected. However, generally the timescales (hundreds of Myrs) of the simulations are quite short, so neglecting these processes is reasonable. Spiral galaxies generally fall into ...
Galaxy Formation,! Reionization, ! the First Stars and Quasars! Ay 127!
... plus the dissipative processes - it is a very messy process, much more complicated than LSS formation and growth! • Probably closely related to the formation of the massive central black holes as well! • Generally, we think of massive galaxy formation at high redshifts (z ~ 3 - 10, say); dwarfs ma ...
... plus the dissipative processes - it is a very messy process, much more complicated than LSS formation and growth! • Probably closely related to the formation of the massive central black holes as well! • Generally, we think of massive galaxy formation at high redshifts (z ~ 3 - 10, say); dwarfs ma ...