Measuring the Rotational Speed of Spiral Galaxies and
... Go over Section A in the Exercise with the students: 2. Remind students of the different types of galaxies (spirals, ellipticals, and irregulars) and that spiral galaxies can be approximated as flattened circular disks that rotate. Explain that galaxies are made of stars, gas, and dark matter. Go ov ...
... Go over Section A in the Exercise with the students: 2. Remind students of the different types of galaxies (spirals, ellipticals, and irregulars) and that spiral galaxies can be approximated as flattened circular disks that rotate. Explain that galaxies are made of stars, gas, and dark matter. Go ov ...
POISE AND EVOLUTION OF THE GALAXY : STRUCTURE ,
... luminous stars ; with a similar width, of the order of 1000 light-years, at least [Fig. 1a]. Such a reconstituted shape is by no way exceptional : quite a lot of galaxies, probably spiral as seen edgeon, in profile, indeed, display such a sandwich structure in direct observation, through the lengthy ...
... luminous stars ; with a similar width, of the order of 1000 light-years, at least [Fig. 1a]. Such a reconstituted shape is by no way exceptional : quite a lot of galaxies, probably spiral as seen edgeon, in profile, indeed, display such a sandwich structure in direct observation, through the lengthy ...
A Universe of Disks
... disks form around young stars and perhaps how gas disks coalesce around black holes at the centers of galaxies. Whether an entire galaxy becomes a disk is a timing issue: spiral galaxies emerge from gas that becomes rotationally supported before patches of the gas contract into stars. If stars are b ...
... disks form around young stars and perhaps how gas disks coalesce around black holes at the centers of galaxies. Whether an entire galaxy becomes a disk is a timing issue: spiral galaxies emerge from gas that becomes rotationally supported before patches of the gas contract into stars. If stars are b ...
Summer 2004 ISP 205: Visions of the Universe Professor: ER Capriotti Sample Questions
... A. hot and the gravitational field is strong. B. cold and the gravitational field is strong. C. hot and the gravitational field is weak. D. cold and the gravitational field is weak. E. hot and the atmosphere is made of hydrogen. 68. Mars and Mercury have similar velocities of escape, yet Mars has an ...
... A. hot and the gravitational field is strong. B. cold and the gravitational field is strong. C. hot and the gravitational field is weak. D. cold and the gravitational field is weak. E. hot and the atmosphere is made of hydrogen. 68. Mars and Mercury have similar velocities of escape, yet Mars has an ...
Is $^ 6$ Li in metal-poor halo stars produced in situ by solar
... (1997) have questioned this result on the basis of the 6 Li production efficiency: assuming the flaring activity of the contemporary Sun for one billion years, they found the amount of flareproduced 6 Li to be negligible as compared with the abundance measured in HD 84937. There are two main reasons t ...
... (1997) have questioned this result on the basis of the 6 Li production efficiency: assuming the flaring activity of the contemporary Sun for one billion years, they found the amount of flareproduced 6 Li to be negligible as compared with the abundance measured in HD 84937. There are two main reasons t ...
Science and the Universe
... • There is indirect evidence that much of our Galaxy is made of material that cannot be observed with presentday instruments – Thus, much of our Galaxy seems to consist of dark matter • Stars in a number of places form clusters, each containing up to hundreds of thousands of stars and taking up a vo ...
... • There is indirect evidence that much of our Galaxy is made of material that cannot be observed with presentday instruments – Thus, much of our Galaxy seems to consist of dark matter • Stars in a number of places form clusters, each containing up to hundreds of thousands of stars and taking up a vo ...
Big Dipper’s Binary Star Has Surprises
... planets around nearby stars, but his attention is not completely off Alcor and Mizar. “Some of us have a feeling that Alcor might actually have another surprise in store for us,” he says. —Jonathan Sherwood ’04 (MA), ’09S (MBA) ...
... planets around nearby stars, but his attention is not completely off Alcor and Mizar. “Some of us have a feeling that Alcor might actually have another surprise in store for us,” he says. —Jonathan Sherwood ’04 (MA), ’09S (MBA) ...
Giant molecular clouds in the dwarf galaxy NGC 1569
... on Plateau de Bure. We find the CO emission is not spatially associated with the two super star clusters in the galaxy, but rather is found in the vicinity of an HII region. With the resolution of our data, we can resolve the CO emission into five distinct giant molecular clouds, four are detected a ...
... on Plateau de Bure. We find the CO emission is not spatially associated with the two super star clusters in the galaxy, but rather is found in the vicinity of an HII region. With the resolution of our data, we can resolve the CO emission into five distinct giant molecular clouds, four are detected a ...
Globular and Open Clusters in our Galaxy
... The overall number of currently known globular clusters in our Galaxy is about 150. They can be find about anywhere in the celestial sphere, but with a significant concentration towards the Milky Way center, which explains why the constellations of Sagittarius, Ophiuchus and Scorpius solely congrega ...
... The overall number of currently known globular clusters in our Galaxy is about 150. They can be find about anywhere in the celestial sphere, but with a significant concentration towards the Milky Way center, which explains why the constellations of Sagittarius, Ophiuchus and Scorpius solely congrega ...
Stellar Spectroscopy during Exoplanet Transits
... of atmospheric structure. These line profiles from disk center (µ = cos = 1) towards the limb are from a CO5BOLD model of a main-sequence star; solar metallicity, Teff = 6800 K. (Models by Hans-Günter Ludwig, Landessternwarte Heidelberg) ...
... of atmospheric structure. These line profiles from disk center (µ = cos = 1) towards the limb are from a CO5BOLD model of a main-sequence star; solar metallicity, Teff = 6800 K. (Models by Hans-Günter Ludwig, Landessternwarte Heidelberg) ...
Zeeman observations: Measuring magnetic fields in the atomic and
... However, special care should be taken to characterize and correct the instrumental polarization. ...
... However, special care should be taken to characterize and correct the instrumental polarization. ...
Powerpoint file
... There are only two astronomical bodies that have a radius ~ 1 REarth: 1. White Dwarf 2. A terrestrial planet White Dwarfs have a mass of ~ 1 Solar Mass, so the radial velocity amplitude should be ~ 100s km/s. This is excluded by low precision radial velocity measurements. ...
... There are only two astronomical bodies that have a radius ~ 1 REarth: 1. White Dwarf 2. A terrestrial planet White Dwarfs have a mass of ~ 1 Solar Mass, so the radial velocity amplitude should be ~ 100s km/s. This is excluded by low precision radial velocity measurements. ...
Wednesday, Sept. 24 - Department of Physics and Astronomy
... – Individual packet of EM energy that makes up EM radiation ...
... – Individual packet of EM energy that makes up EM radiation ...
Physics of the Interstellar Medium
... high irregular gas motions. Here the energy input from cold accretion streams may drive turbulent motions at the measured rate. Yet another problem is coupling interstellar turbulence with heating- and cooling processes and chemical reaction rates in order to generate the filamentary mixture of diff ...
... high irregular gas motions. Here the energy input from cold accretion streams may drive turbulent motions at the measured rate. Yet another problem is coupling interstellar turbulence with heating- and cooling processes and chemical reaction rates in order to generate the filamentary mixture of diff ...
Chemical abundances and winds of massive stars in M31: a B
... Numerous surveys have identified OB and WR stars beyond the Magellanic Clouds e.g. Massey et al. (1986); Moffat & Shara (1987), although little quantitative analysis has been carried out to date. The only detailed studies of WolfRayet stars beyond the Magellanic Clouds have been studies of late WN s ...
... Numerous surveys have identified OB and WR stars beyond the Magellanic Clouds e.g. Massey et al. (1986); Moffat & Shara (1987), although little quantitative analysis has been carried out to date. The only detailed studies of WolfRayet stars beyond the Magellanic Clouds have been studies of late WN s ...
Theory vs. Theory - ASIAA
... 2. Sum this flux over nearly horizontal surfaces to find the total vertical convective energy flux as a function of height in the disk. ...
... 2. Sum this flux over nearly horizontal surfaces to find the total vertical convective energy flux as a function of height in the disk. ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.