Powerpoint for today
... - contains young and old stars, gas, dust. Has spiral structure - vertical thickness roughly 100 pc - 2 kpc (depending on component. Most gas and dust in thinner layer, most stars in thicker layer) ...
... - contains young and old stars, gas, dust. Has spiral structure - vertical thickness roughly 100 pc - 2 kpc (depending on component. Most gas and dust in thinner layer, most stars in thicker layer) ...
PH607lec12-5gal3
... Often low surface brightness, so they are hard to find! Why are dwarf galaxies important?? Majority of galaxies are dwarfs!! There are probably lots of these, in the Local Group there are >30! Dwarf galaxies may be remnants of galaxy formation process: “proto-dwarf” gas clouds came together to form ...
... Often low surface brightness, so they are hard to find! Why are dwarf galaxies important?? Majority of galaxies are dwarfs!! There are probably lots of these, in the Local Group there are >30! Dwarf galaxies may be remnants of galaxy formation process: “proto-dwarf” gas clouds came together to form ...
Elliptical galaxies
... Many of the normal ellipticals contain visible amounts of dust, partially manifested as a dust disk. The metallicity of ellipticals and S0 galaxies increases towards the galaxy center, as derived from color gradients. Also in S0 galaxies the bulge appears redder than the ...
... Many of the normal ellipticals contain visible amounts of dust, partially manifested as a dust disk. The metallicity of ellipticals and S0 galaxies increases towards the galaxy center, as derived from color gradients. Also in S0 galaxies the bulge appears redder than the ...
ppt - NRAO
... E.g.: Taurus (of course), Orion is much larger than the Orion Nebula, It is not clear if all of Perseus is at the same distance (NGC1333 vs. IC 348), Ophiuchus streamers, etc.. (Note that these regions tend to be heavily obscured, so optical experiments are unlikely to improve significantly the situ ...
... E.g.: Taurus (of course), Orion is much larger than the Orion Nebula, It is not clear if all of Perseus is at the same distance (NGC1333 vs. IC 348), Ophiuchus streamers, etc.. (Note that these regions tend to be heavily obscured, so optical experiments are unlikely to improve significantly the situ ...
Lecture notes 18: Galaxies and galaxy clusters
... their physical parameters with masses 107 −1013 MS and diameters 0.1−100 kpc. The spirals were subdived into the sequence Sa – Sc and SBa – SBc for the barred spirals. The range in parameters for these galaxies is smaller: masses 109 − 1012 MS and diameters 5 − 100 kpc. Hubble ordered the various ga ...
... their physical parameters with masses 107 −1013 MS and diameters 0.1−100 kpc. The spirals were subdived into the sequence Sa – Sc and SBa – SBc for the barred spirals. The range in parameters for these galaxies is smaller: masses 109 − 1012 MS and diameters 5 − 100 kpc. Hubble ordered the various ga ...
Lecture 21 (pdf from the powerpoint)
... b) Rich, regular clusters are dominated by central giant ellipticals. c) Both spiral and elliptical galaxies are seen at very high redshift. d) Some galaxies seems to be undergoing bursts of star formation. ...
... b) Rich, regular clusters are dominated by central giant ellipticals. c) Both spiral and elliptical galaxies are seen at very high redshift. d) Some galaxies seems to be undergoing bursts of star formation. ...
• Only a few graded so far, but I have been impressed with the
... a)! Yes, we’re all going to die! b)! No, in about 1 billion years the oceans will likely boil. c)! Yes, due to a new estimate of the Milky Way mass, it will probably happen sooner, so live it up furball. d)! No, galaxies are mostly empty space so the Sun is safe, except for the possibility of our or ...
... a)! Yes, we’re all going to die! b)! No, in about 1 billion years the oceans will likely boil. c)! Yes, due to a new estimate of the Milky Way mass, it will probably happen sooner, so live it up furball. d)! No, galaxies are mostly empty space so the Sun is safe, except for the possibility of our or ...
The age–metallicity distribution of earth-harbouring stars
... • The relation between age and metallicity is very tight and agrees with the general predictions of the chemical evolution theory. • The Sun is more metalrich than 85% of its coeval stars. • Direct spectroscopic findings of terrestrial planets would be more efficient if young stars (having 3 t ...
... • The relation between age and metallicity is very tight and agrees with the general predictions of the chemical evolution theory. • The Sun is more metalrich than 85% of its coeval stars. • Direct spectroscopic findings of terrestrial planets would be more efficient if young stars (having 3 t ...
Exploring the Helium Reionization Era
... Exploring the Helium Reionization Era In Big Bang cosmology, the universe began as a hot, dense, gas fireball. Due to its extreme initial temperature, charged particles (ions) within the gas were not bound together into neutral atoms, but freely streamed outward with other subatomic particles as th ...
... Exploring the Helium Reionization Era In Big Bang cosmology, the universe began as a hot, dense, gas fireball. Due to its extreme initial temperature, charged particles (ions) within the gas were not bound together into neutral atoms, but freely streamed outward with other subatomic particles as th ...
Chapter 16
... 2. The center portion was the first to become dense enough for stars to form. Dense pockets in orbit around the center became globular clusters. 3. The initial cloud had some rotation, and as it contracted it spun faster. The rotating matter formed into a disk. 4. Density waves formed in the Galaxy’ ...
... 2. The center portion was the first to become dense enough for stars to form. Dense pockets in orbit around the center became globular clusters. 3. The initial cloud had some rotation, and as it contracted it spun faster. The rotating matter formed into a disk. 4. Density waves formed in the Galaxy’ ...
HIGH RESOLTION SPH SIMULATIONS OF GALAXY CLUSTERS
... Spatial smoothing= 0.5 kpc Different feedback params. ...
... Spatial smoothing= 0.5 kpc Different feedback params. ...
Chapter 14
... High Mass Stars – Less than 100 M on Main Sequence – Become Neutron Stars (1.4M < M < 3M) » Neutron Degeneracy Pressure ...
... High Mass Stars – Less than 100 M on Main Sequence – Become Neutron Stars (1.4M < M < 3M) » Neutron Degeneracy Pressure ...
Review Sheet and Study Hints - Tufts Institute of Cosmology
... draw evolutionary tracks in the HRD for stars of different masses comment on relative evolutionary time-scales globular cluster HRD’s main sequence turnoff and ages distance determinations use the HRD to determine star-formation histories in galaxies ...
... draw evolutionary tracks in the HRD for stars of different masses comment on relative evolutionary time-scales globular cluster HRD’s main sequence turnoff and ages distance determinations use the HRD to determine star-formation histories in galaxies ...
ASTRONOMY 120
... If you wish, you may discuss the questions with friends, but please turn in your own hand-written solutions, with questions answered in your own way. 1. Chaisson Review and Discussion 21.1 Under what circumstances will a binary star produce a nova? (3 points) A nova is a binary star system that sudd ...
... If you wish, you may discuss the questions with friends, but please turn in your own hand-written solutions, with questions answered in your own way. 1. Chaisson Review and Discussion 21.1 Under what circumstances will a binary star produce a nova? (3 points) A nova is a binary star system that sudd ...
thumbnail images - Kapteyn Astronomical Institute
... Young stars generally shine most of their light in the blue, while old stars are brighter in the red. Young stars generally have high L/M ratios (Luminosities for a given mass), so the mass of a galaxy is generally determined by the red stars. So: to find the mass, a red band is required. Redshift m ...
... Young stars generally shine most of their light in the blue, while old stars are brighter in the red. Young stars generally have high L/M ratios (Luminosities for a given mass), so the mass of a galaxy is generally determined by the red stars. So: to find the mass, a red band is required. Redshift m ...
Clase-06_Star_Formation - Departamento de Astronomía
... timescales are of order 107-108 years the burst is often confined to a few hundred pc near the nucleus, although disc-wide bursts are also common SB are usually found in interacting galaxies, merging systems and bursting dwarves ...
... timescales are of order 107-108 years the burst is often confined to a few hundred pc near the nucleus, although disc-wide bursts are also common SB are usually found in interacting galaxies, merging systems and bursting dwarves ...
Galaxy Formation,! Reionization, ! the First Stars and Quasars! Ay 127!
... • Observations have found populations of what must be young galaxies (ages < 1 Gyr), ostensibly progenitors of large galaxies today, at z ~ 5 - 7! • The frontier is now at z ~ 7 - 20, the so-called Reionization Era! ...
... • Observations have found populations of what must be young galaxies (ages < 1 Gyr), ostensibly progenitors of large galaxies today, at z ~ 5 - 7! • The frontier is now at z ~ 7 - 20, the so-called Reionization Era! ...
solar.gmu.edu
... •A quasar’s luminosity can be calculated from its apparent brightness and the distance using the inverse-square law •Even though small, the luminosity of a quasar (1038 to 1042 Watts) can be very larger, i.e., several thousand times more than the entire Milly Way Galaxies (1037). •A quasar has emiss ...
... •A quasar’s luminosity can be calculated from its apparent brightness and the distance using the inverse-square law •Even though small, the luminosity of a quasar (1038 to 1042 Watts) can be very larger, i.e., several thousand times more than the entire Milly Way Galaxies (1037). •A quasar has emiss ...
StellarManual
... distance of 10 parsecs from the Earth, which means that absolute magnitude is also an implicit measure of intrinsic brightness and how much energy a star is releasing per second (luminosity). Thus: Avior (m = 1.9) and Alkaid (m = 1.9) appear to be the same brightness, but Avior (M = -4.8) emits more ...
... distance of 10 parsecs from the Earth, which means that absolute magnitude is also an implicit measure of intrinsic brightness and how much energy a star is releasing per second (luminosity). Thus: Avior (m = 1.9) and Alkaid (m = 1.9) appear to be the same brightness, but Avior (M = -4.8) emits more ...
PH607lec11-4gal2
... Half of all disk galaxies show a central bar which contains up to 1/3 of the total light Bars are almost as flat as surrounding disks. S0 galaxies can have bars – a bar can persist in the absence of gas Bar patterns are not static, they rotate with a pattern speed, but unlike spiral arms they are n ...
... Half of all disk galaxies show a central bar which contains up to 1/3 of the total light Bars are almost as flat as surrounding disks. S0 galaxies can have bars – a bar can persist in the absence of gas Bar patterns are not static, they rotate with a pattern speed, but unlike spiral arms they are n ...
Slide 1
... A superstructure can have extents of order 100 Mpc, have masses above 105 solar masses. A cluster is member of supercluster ...
... A superstructure can have extents of order 100 Mpc, have masses above 105 solar masses. A cluster is member of supercluster ...
Spatial distribution of stars in the Milky Way
... Thus for an infinite, homogeneous, transparent Galaxy, the sky should be a very bright surface. This result is known as Olbers' paradox, and it shows that one of the assumptions we have made must be wrong. Clearly, it is not correct to assume that the Galaxy has an infinite extent. A similar problem ...
... Thus for an infinite, homogeneous, transparent Galaxy, the sky should be a very bright surface. This result is known as Olbers' paradox, and it shows that one of the assumptions we have made must be wrong. Clearly, it is not correct to assume that the Galaxy has an infinite extent. A similar problem ...
First Light for May, 2001 - South Bay Astronomical Society
... a lot of faint objects. I started out hunting through all the different globular clusters that swarm around the galactic core like moths around a light. Many were small and faint, but some were small yet very bright. I was way late getting around to M5 which, even though low, was still magnificent. ...
... a lot of faint objects. I started out hunting through all the different globular clusters that swarm around the galactic core like moths around a light. Many were small and faint, but some were small yet very bright. I was way late getting around to M5 which, even though low, was still magnificent. ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.