Small galaxies are growing smaller
... Harvard College Observatory assistant astronomer Sylvia Mussells on plates taken by Shapley (see A&G 2003 45 1.18). Sculptor, in particular, was very much less luminous (by another factor ~100) than previously known galaxies – with modern distance estimates it has MV ≈ –10 – and these two were the f ...
... Harvard College Observatory assistant astronomer Sylvia Mussells on plates taken by Shapley (see A&G 2003 45 1.18). Sculptor, in particular, was very much less luminous (by another factor ~100) than previously known galaxies – with modern distance estimates it has MV ≈ –10 – and these two were the f ...
The Missing Mass
... Centripetal force does not strongly effect the gas that is above and below the rotation plane. So … • Gas falling in from the top collides with gas falling in from the bottom. This gas sticks together and forms the galaxy’s disk. • All star formation now occurs in a disk (where all the gas is). The ...
... Centripetal force does not strongly effect the gas that is above and below the rotation plane. So … • Gas falling in from the top collides with gas falling in from the bottom. This gas sticks together and forms the galaxy’s disk. • All star formation now occurs in a disk (where all the gas is). The ...
Galaxy Hunters Article, Cosmology Information, First Star Facts
... created supercomputer simulations that show how stars were formed from these gases. The first step, according to the simulations, was when gravity gathered gases into diffuse clouds. As the gases cooled, they coalesced at the center of each cloud into a clump no larger than our sun. The dump collaps ...
... created supercomputer simulations that show how stars were formed from these gases. The first step, according to the simulations, was when gravity gathered gases into diffuse clouds. As the gases cooled, they coalesced at the center of each cloud into a clump no larger than our sun. The dump collaps ...
Young Stars in AGN
... Heckman, Krolik, Meurer, Calzetti, Kinney, Koratkar, Leitherer, Robert and Wilson (1995): ApJ 452, 549 Heckman, Gonzalez-Delgado, Leitherer, Meurer, Krolik, Wilson, Koratkar and Kinney (1997): ApJ 482, 114 ...
... Heckman, Krolik, Meurer, Calzetti, Kinney, Koratkar, Leitherer, Robert and Wilson (1995): ApJ 452, 549 Heckman, Gonzalez-Delgado, Leitherer, Meurer, Krolik, Wilson, Koratkar and Kinney (1997): ApJ 482, 114 ...
Paper - Astrophysics - University of Oxford
... Indeed the more massive stars die in spectacular supernova explosions that can outshine a whole galaxy. With an ELT these explosions can be seen to such vast distances (corresponding to redshift about 10) that their light has taken most of the age of the Universe to reach us. The frequency of these ...
... Indeed the more massive stars die in spectacular supernova explosions that can outshine a whole galaxy. With an ELT these explosions can be seen to such vast distances (corresponding to redshift about 10) that their light has taken most of the age of the Universe to reach us. The frequency of these ...
Galaxies - SD43 Teacher Sites
... Despite the immense number of galaxies, most can be classified according to one of three basic shapes: spiral, elliptical, and irregular. • A spiral galaxy, when viewed from above, looks like a pinwheel, with many long “arms” spiralling out from a centre core (Figure 10.11). Viewed from along its ed ...
... Despite the immense number of galaxies, most can be classified according to one of three basic shapes: spiral, elliptical, and irregular. • A spiral galaxy, when viewed from above, looks like a pinwheel, with many long “arms” spiralling out from a centre core (Figure 10.11). Viewed from along its ed ...
DAVID A. RIETHMILLER - Department of Physics and Astronomy
... Ph.D. Thesis Topic – Ohio University (current): My current research explores the hydrodynamic history of elliptical galaxies, simulating various prescriptions for interstellar gas cooling and AGN energy feedback against real X-ray observations of ellipticals. The goal is to isolate those prescriptio ...
... Ph.D. Thesis Topic – Ohio University (current): My current research explores the hydrodynamic history of elliptical galaxies, simulating various prescriptions for interstellar gas cooling and AGN energy feedback against real X-ray observations of ellipticals. The goal is to isolate those prescriptio ...
Properties of Ellipticals and Spirals
... Spirals have Gas and Dust and Young Stars – continual star formation Ellipicals are devoid of gas and dust and can no longer form young stars Ellipicals have old stars – but they have high metallicity ...
... Spirals have Gas and Dust and Young Stars – continual star formation Ellipicals are devoid of gas and dust and can no longer form young stars Ellipicals have old stars – but they have high metallicity ...
9 Dwarf Galaxies
... Need dedicated surveys Recent automated CCD surveys suggest there may be more LSB galaxies than all the other types of galaxy put together Peculiar Galaxies In particular, interacting galaxies Many cataloged by Arp in 1966 ...
... Need dedicated surveys Recent automated CCD surveys suggest there may be more LSB galaxies than all the other types of galaxy put together Peculiar Galaxies In particular, interacting galaxies Many cataloged by Arp in 1966 ...
PH607lec10-4gal2
... Need dedicated surveys Recent automated CCD surveys suggest there may be more LSB galaxies than all the other types of galaxy put together Peculiar Galaxies In particular, interacting galaxies Many cataloged by Arp in 1966 ...
... Need dedicated surveys Recent automated CCD surveys suggest there may be more LSB galaxies than all the other types of galaxy put together Peculiar Galaxies In particular, interacting galaxies Many cataloged by Arp in 1966 ...
PH607lec11-4gal2
... Recent automated CCD surveys suggest there may be more LSB galaxies than all the other types of galaxy put together Peculiar Galaxies In particular, interacting galaxies Many cataloged by Arp in 1966 ...
... Recent automated CCD surveys suggest there may be more LSB galaxies than all the other types of galaxy put together Peculiar Galaxies In particular, interacting galaxies Many cataloged by Arp in 1966 ...
PH607lec12-5gal3
... Need dedicated surveys Recent automated CCD surveys suggest there may be more LSB galaxies than all the other types of galaxy put together Peculiar Galaxies In particular, interacting galaxies Many cataloged by Arp in 1966 ...
... Need dedicated surveys Recent automated CCD surveys suggest there may be more LSB galaxies than all the other types of galaxy put together Peculiar Galaxies In particular, interacting galaxies Many cataloged by Arp in 1966 ...
Galaxy Powerpoint Notes
... Galaxy collisions The Big Band Theory states that the Universe began a long time ago, with galaxies and early stars forming just after. It also states that the Universe is still expanding today, meaning that the galaxies that we see today are travelling at high speeds. Eventually, sooner or later, t ...
... Galaxy collisions The Big Band Theory states that the Universe began a long time ago, with galaxies and early stars forming just after. It also states that the Universe is still expanding today, meaning that the galaxies that we see today are travelling at high speeds. Eventually, sooner or later, t ...
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. ...
A Study of the Spiral Galaxy M101 Elizabeth City State University
... show examples of each type. Galaxies have an enormous range in mass and size as indicated in Table 1. Galaxies are separated by vast gulfs of space. For example, our own Milky Way is over 160,000 light years away from its nearest extragalactic neighbor, the Large Magellanic Cloud. Despite these larg ...
... show examples of each type. Galaxies have an enormous range in mass and size as indicated in Table 1. Galaxies are separated by vast gulfs of space. For example, our own Milky Way is over 160,000 light years away from its nearest extragalactic neighbor, the Large Magellanic Cloud. Despite these larg ...
The Hubble Ultra Deep Field Project Overview
... The velocity you calculated for this star is much less than the speed of light, so we could have found a decent approximation to the answer using z = v/c. But, if you use the approximation equation to calculate the recession velocity based on the spectral shift from the spectrum of a distant galaxy ...
... The velocity you calculated for this star is much less than the speed of light, so we could have found a decent approximation to the answer using z = v/c. But, if you use the approximation equation to calculate the recession velocity based on the spectral shift from the spectrum of a distant galaxy ...
The evolution of spiral galaxies in clusters Kutdemir, Elif
... ers, which are not common processes in clusters. The high relative speeds of galaxies in the inner regions of galaxy clusters prevent the formation of a gravitationally bound pair during close encounters. Cluster outskirts, where galaxy groups with relatively low velocity dispersions fall in, are su ...
... ers, which are not common processes in clusters. The high relative speeds of galaxies in the inner regions of galaxy clusters prevent the formation of a gravitationally bound pair during close encounters. Cluster outskirts, where galaxy groups with relatively low velocity dispersions fall in, are su ...
Ch17_Galaxies
... separate class of object from normal S spirals, computer simulations show bar may be result of a close encounter between two galaxies • The Milky Way is probably an SB galaxy ...
... separate class of object from normal S spirals, computer simulations show bar may be result of a close encounter between two galaxies • The Milky Way is probably an SB galaxy ...
PDF
... morphology by exploiting deep HST images spanning a substantial range in look-back time. Prior to HST, attempts had been made from the best ground-based observatories to resolve and classify distant galaxies but, even in the best conditions, galaxies as close as redshifts of 0.3–0.5 (corresponding t ...
... morphology by exploiting deep HST images spanning a substantial range in look-back time. Prior to HST, attempts had been made from the best ground-based observatories to resolve and classify distant galaxies but, even in the best conditions, galaxies as close as redshifts of 0.3–0.5 (corresponding t ...
has occurred over the past 14 billion years COSMIC DOWNSIZING
... which objects are in front and which are more distant — among the thousands of galaxies in a typical deep-field image. The standard way to perform this task is to obtain a spectrum of each galaxy in the image and measure its redshift. Because of the universe’s expansion, the light from distant sourc ...
... which objects are in front and which are more distant — among the thousands of galaxies in a typical deep-field image. The standard way to perform this task is to obtain a spectrum of each galaxy in the image and measure its redshift. Because of the universe’s expansion, the light from distant sourc ...
Galaxy Questions Info
... A spiral galaxy consists of a flattened disk containing spiral (pinwheel-shaped) arms, a bulge at its center, and a halo. Spiral galaxies have a variety of shapes, and they are classified according to the size of the bulge and the tightness and appearance of the arms. The spiral arms, which wrap aro ...
... A spiral galaxy consists of a flattened disk containing spiral (pinwheel-shaped) arms, a bulge at its center, and a halo. Spiral galaxies have a variety of shapes, and they are classified according to the size of the bulge and the tightness and appearance of the arms. The spiral arms, which wrap aro ...
Lecture-25 Notes - Georgia Southern University Astrophysics
... Plot at left shows the number of! Quasars per unit volume as a! function of the universe’s age! (i.e., a function of “z”).! Quasars were 35x more common! at z~2.5 than today, ~1010 years! ago. (They are rare today).! ...
... Plot at left shows the number of! Quasars per unit volume as a! function of the universe’s age! (i.e., a function of “z”).! Quasars were 35x more common! at z~2.5 than today, ~1010 years! ago. (They are rare today).! ...
First Light for May, 2001 - South Bay Astronomical Society
... both methods can be used on a exo-system, the size and mass of the planets can be determined. Given these two methods, it’s not entirely surprising that many of the earliest exo-planets discovered were all “Hot Jupiters”, large massive planets in very close orbits around their stars. 51 Pegasi has a ...
... both methods can be used on a exo-system, the size and mass of the planets can be determined. Given these two methods, it’s not entirely surprising that many of the earliest exo-planets discovered were all “Hot Jupiters”, large massive planets in very close orbits around their stars. 51 Pegasi has a ...
The Galaxies
... studying how the stars in our galaxy move, we can tell that most of the galaxy’s mass is in the corona, in a form that doesn’t give off light. ► It is called dark matter. ► We’re not sure what it is, although there are several very good ideas. ...
... studying how the stars in our galaxy move, we can tell that most of the galaxy’s mass is in the corona, in a form that doesn’t give off light. ► It is called dark matter. ► We’re not sure what it is, although there are several very good ideas. ...
Pea galaxy
A Pea galaxy, also referred to as a Pea or Green Pea, might be a type of Luminous Blue Compact Galaxy which is undergoing very high rates of star formation. Pea galaxies are so-named because of their small size and greenish appearance in the images taken by the Sloan Digital Sky Survey (SDSS).Pea Galaxies were first discovered in 2007 by the volunteer users within the forum section of the online astronomy project Galaxy Zoo (GZ).