WFIRSTSurveyScience
... A space-based near-IR survey of the outer galaxy can overcome many of these problems and allow use of the Milky Way as a laboratory for how the star-formation process depends on metallicity, gas surface density and triggering mechanisms. The most distant star-forming regions in the galaxy are expect ...
... A space-based near-IR survey of the outer galaxy can overcome many of these problems and allow use of the Milky Way as a laboratory for how the star-formation process depends on metallicity, gas surface density and triggering mechanisms. The most distant star-forming regions in the galaxy are expect ...
Read the article
... smaller spiral (light months), seem to exist in the galactic center. Among the O/B stars moving close to SgrA* only S2 has been seen to complete two-third of its Keplerian orbit around SgrA* (Schödel et al. 2002). The Keplerian orbits of the other stars are more a matter of guess. Apart from S2, th ...
... smaller spiral (light months), seem to exist in the galactic center. Among the O/B stars moving close to SgrA* only S2 has been seen to complete two-third of its Keplerian orbit around SgrA* (Schödel et al. 2002). The Keplerian orbits of the other stars are more a matter of guess. Apart from S2, th ...
ppt
... – Stellar dynamics of galaxy agree with dark matter model (Wyse et al.) – Mass of the Milky Way (0.7 - 2.0 x 1012 solar) from high-velocity stars ...
... – Stellar dynamics of galaxy agree with dark matter model (Wyse et al.) – Mass of the Milky Way (0.7 - 2.0 x 1012 solar) from high-velocity stars ...
Planisphere
... RA-Dec coordinates are only good for storing the location of stars in reference books. This coordinate system, called the equatorial system, tells us nothing about how to actually find something in the sky when we go outside. The altitude-azimuth coordinate system, called the horizon system, fulfill ...
... RA-Dec coordinates are only good for storing the location of stars in reference books. This coordinate system, called the equatorial system, tells us nothing about how to actually find something in the sky when we go outside. The altitude-azimuth coordinate system, called the horizon system, fulfill ...
A new formula for the rotation velocity – and density distribution of a
... a function of the distance from the center of the galaxy. Such a rotational curve has been determined from gas and stars in the distant parts of our galaxy, far beyond our distance to the center. Unexpectedly, it does not follow the Keplerian decrease in which the circular rotation velocity v decrea ...
... a function of the distance from the center of the galaxy. Such a rotational curve has been determined from gas and stars in the distant parts of our galaxy, far beyond our distance to the center. Unexpectedly, it does not follow the Keplerian decrease in which the circular rotation velocity v decrea ...
Determination of spiral orbits with constant tangential velocity
... laws of gravity, one comes across a surprising contradiction. The Newtonian equations of motion show that the stars that are located far away from the center have to move more slowly than those located closer to the center. Lower speeds are expected again only very close to the center, because the c ...
... laws of gravity, one comes across a surprising contradiction. The Newtonian equations of motion show that the stars that are located far away from the center have to move more slowly than those located closer to the center. Lower speeds are expected again only very close to the center, because the c ...
Which Phase of the Interstellar Medium Corelates with the Star
... All of these models produce similar results for nearby spiral galaxies, where the majority of gravitationally bound structures are also molecular and cooled by CO. However, whether star formation follows global dynamics, the H i to H2 transition, or the C ii to CO transition makes a very large diffe ...
... All of these models produce similar results for nearby spiral galaxies, where the majority of gravitationally bound structures are also molecular and cooled by CO. However, whether star formation follows global dynamics, the H i to H2 transition, or the C ii to CO transition makes a very large diffe ...
My talk on CO at z=0 from Santiago in June, 2011
... BIGIEL+ ’11, LEROY+ IN PREP. compiling many others ...
... BIGIEL+ ’11, LEROY+ IN PREP. compiling many others ...
Protogalaxies Encyclopedia of Astronomy & Astrophysics eaa.iop.org S G Djorgovski
... or formation histories at work. The interplay of mass assembly and star formation fundamentally determines the galaxy morphology and the origin of disks in SPIRAL GALAXIES. In general, random merging of fragments leads to the formation of spheroidal (or, more accurately, triaxial) systems such as th ...
... or formation histories at work. The interplay of mass assembly and star formation fundamentally determines the galaxy morphology and the origin of disks in SPIRAL GALAXIES. In general, random merging of fragments leads to the formation of spheroidal (or, more accurately, triaxial) systems such as th ...
It is now recognized that the vast majority of ellipticals are of
... • In contrast, E galaxies with close companions often have luminosity profiles which rise above a de Vaucouleurs law at large radii. These features may be plausibly blamed on tidal interactions. • E galaxies in closely interacting systems sometimes exhibit outer isophotes which are visibly eggshaped ...
... • In contrast, E galaxies with close companions often have luminosity profiles which rise above a de Vaucouleurs law at large radii. These features may be plausibly blamed on tidal interactions. • E galaxies in closely interacting systems sometimes exhibit outer isophotes which are visibly eggshaped ...
Answer to question 1 - Northwestern University
... If Supernovae are so good, why bother? Supernovae are not frequent => not frequent enough if we want to measure the distance to some objects directly. Indirect = Hubble relationship (or a fancier form for z > 0.1) and measure a redshift. Indirect doesn’t work if it’s too close = closer than about 2 ...
... If Supernovae are so good, why bother? Supernovae are not frequent => not frequent enough if we want to measure the distance to some objects directly. Indirect = Hubble relationship (or a fancier form for z > 0.1) and measure a redshift. Indirect doesn’t work if it’s too close = closer than about 2 ...
Protogalaxies
... or formation histories at work. The interplay of mass assembly and star formation fundamentally determines the galaxy morphology and the origin of disks in SPIRAL GALAXIES. In general, random merging of fragments leads to the formation of spheroidal (or, more accurately, triaxial) systems such as th ...
... or formation histories at work. The interplay of mass assembly and star formation fundamentally determines the galaxy morphology and the origin of disks in SPIRAL GALAXIES. In general, random merging of fragments leads to the formation of spheroidal (or, more accurately, triaxial) systems such as th ...
Lecture6
... clumpy, cool, dense clouds called `dark nebulae’ in or near molecular clouds (cool clouds with CO and H2 molecules). Bursts of protostar formation takes place when these dense regions are hit by high speed (`supersonic’, meaning speed faster than the sound speed) winds from a near-by supernova explo ...
... clumpy, cool, dense clouds called `dark nebulae’ in or near molecular clouds (cool clouds with CO and H2 molecules). Bursts of protostar formation takes place when these dense regions are hit by high speed (`supersonic’, meaning speed faster than the sound speed) winds from a near-by supernova explo ...
Starbursts – from 30 Doradus to Lyman
... Another line of argument has to do with the mass deposition in stars over cosmic time. There is evidence that some 50% of all stars in local galaxies at the present epoch may have been generated in (luminous) infrared galaxies, which we now know are among the major contributors to starbursts at inte ...
... Another line of argument has to do with the mass deposition in stars over cosmic time. There is evidence that some 50% of all stars in local galaxies at the present epoch may have been generated in (luminous) infrared galaxies, which we now know are among the major contributors to starbursts at inte ...
The Science of Life in the Universe (Chap 2
... • it does show relative differences among higher atomic weight elements better than linear scale ...
... • it does show relative differences among higher atomic weight elements better than linear scale ...
presentation (PPT format)
... • How did astronomers first discover other galaxies? • How did astronomers first determine the distances to galaxies? • Do all galaxies have spiral arms, like the Milky Way? • How do modern astronomers tell how far away galaxies are? • How do the spectra of galaxies tell astronomers that the univers ...
... • How did astronomers first discover other galaxies? • How did astronomers first determine the distances to galaxies? • Do all galaxies have spiral arms, like the Milky Way? • How do modern astronomers tell how far away galaxies are? • How do the spectra of galaxies tell astronomers that the univers ...
The Science of Life in the Universe (Chap 2
... • it does show relative differences among higher atomic weight elements better than linear scale ...
... • it does show relative differences among higher atomic weight elements better than linear scale ...
Chapter 3 Notes
... • it does show relative differences among higher atomic weight elements better than linear scale ...
... • it does show relative differences among higher atomic weight elements better than linear scale ...
Lecture 4-Energy sources
... • Over last 10 Billion years there have been many galaxy collisions in galaxy clusters. • When two galaxies pass through each other stars will continue on their original path – more or less. • Interstellar gas clouds collide and cannot pass through each other. • They get stripped and pass into the g ...
... • Over last 10 Billion years there have been many galaxy collisions in galaxy clusters. • When two galaxies pass through each other stars will continue on their original path – more or less. • Interstellar gas clouds collide and cannot pass through each other. • They get stripped and pass into the g ...
Energy sources
... • Over last 10 Billion years there have been many galaxy collisions in galaxy clusters. • When two galaxies pass through each other stars will continue on their original path – more or less. • Interstellar gas clouds collide and cannot pass through each other. • They get stripped and pass into the g ...
... • Over last 10 Billion years there have been many galaxy collisions in galaxy clusters. • When two galaxies pass through each other stars will continue on their original path – more or less. • Interstellar gas clouds collide and cannot pass through each other. • They get stripped and pass into the g ...
white paper
... from GMCs (100pc) down to clump/cores (few pc) in galaxies out to the Virgo Cluster, with an order of magnitude faster mapping speed than ALMA. • A complete census of the cold molecular gas fueling the star formation history of the Universe back to the first galaxies: octave bandwidth at ∼ 1cm wavel ...
... from GMCs (100pc) down to clump/cores (few pc) in galaxies out to the Virgo Cluster, with an order of magnitude faster mapping speed than ALMA. • A complete census of the cold molecular gas fueling the star formation history of the Universe back to the first galaxies: octave bandwidth at ∼ 1cm wavel ...
Astrophysics in the Time Domain: Results and lessons
... NGC 4216 in a simulated halo from: John Kormendy (http://chandra.as.utexas.edu/~kormendy/dm-halo-pic.html) ...
... NGC 4216 in a simulated halo from: John Kormendy (http://chandra.as.utexas.edu/~kormendy/dm-halo-pic.html) ...
17.1 Introduction
... of convection, which then prevents the helium ionization zone from driving the pulsation. For hotter temperatures, the helium ionization zone is located too far out in the atmosphere for significant pulsations to occur. There are complications, of course. Stars spend only a short fraction of their l ...
... of convection, which then prevents the helium ionization zone from driving the pulsation. For hotter temperatures, the helium ionization zone is located too far out in the atmosphere for significant pulsations to occur. There are complications, of course. Stars spend only a short fraction of their l ...