Baryons at Low Densities: The Stellar Halos around Galaxies
... was largely built from one, or a few, relatively massive (> 109 MA) accretion events, but at large radii many low-mass accretions have contributed to the recent buildup of the halo. The kinematics of the inner halo stars is however consistent with their origin from the disc — these stars were likely ...
... was largely built from one, or a few, relatively massive (> 109 MA) accretion events, but at large radii many low-mass accretions have contributed to the recent buildup of the halo. The kinematics of the inner halo stars is however consistent with their origin from the disc — these stars were likely ...
emission-weighted temperature X-ray surface brightness Star
... but also need input physics for radiative cooling, star formation, feedback from supernova and active galactic nuclei, thermal conduction - everything that can significantly impact energy balance in the gas. ...
... but also need input physics for radiative cooling, star formation, feedback from supernova and active galactic nuclei, thermal conduction - everything that can significantly impact energy balance in the gas. ...
Name - Thomas C. Cario Middle School
... thing we know of, as it travels at an incredible 186,000 miles (300,000 kilometers) per second. Your job is to calculate the value of one light-year. Calculate the number of seconds in one year. ...
... thing we know of, as it travels at an incredible 186,000 miles (300,000 kilometers) per second. Your job is to calculate the value of one light-year. Calculate the number of seconds in one year. ...
Understanding the Astrophysics of Galaxy Evolution: the role of
... and showed that LBGs had moderate mass (109 −1010 M⊙ ) and metallicity (0.3 solar), that they were forming stars very rapidly, and that supernovae were driving significant outflows. Since then, the race to claim the record for the highest redshift object has absorbed many in the field. Today, this r ...
... and showed that LBGs had moderate mass (109 −1010 M⊙ ) and metallicity (0.3 solar), that they were forming stars very rapidly, and that supernovae were driving significant outflows. Since then, the race to claim the record for the highest redshift object has absorbed many in the field. Today, this r ...
Document
... f(mu) is the distribution function of the mass ratio in binary systems A(t) and W(t) are the accretion and outflow rate, respectively ...
... f(mu) is the distribution function of the mass ratio in binary systems A(t) and W(t) are the accretion and outflow rate, respectively ...
NASA FUSE Satellite Solves the Case of the Missing Deuterium
... computer models that showed how deuterium, compared to hydrogen, might preferentially bind to interstellar dust grains, changing from an easily detectable gaseous form to an unobservable solid form. The new FUSE data strongly support this theory. In regions that remain undisturbed for long periods, ...
... computer models that showed how deuterium, compared to hydrogen, might preferentially bind to interstellar dust grains, changing from an easily detectable gaseous form to an unobservable solid form. The new FUSE data strongly support this theory. In regions that remain undisturbed for long periods, ...
Globular Cluster Formation in CDM Cosmologies
... • The Big-Bang is not like a bomb going off inside some space – it is spacetime itself that “explodes” – about 15 billion yrs ago. • Picture dots on a balloon (galaxies). As balloon expands (ie spacetime), galaxies carried away from one another. Every observer on every dot sees all the other dots re ...
... • The Big-Bang is not like a bomb going off inside some space – it is spacetime itself that “explodes” – about 15 billion yrs ago. • Picture dots on a balloon (galaxies). As balloon expands (ie spacetime), galaxies carried away from one another. Every observer on every dot sees all the other dots re ...
Nuclear Stellar Populations in Bright Spiral Galaxies
... sample (the ISO Atlas of Bright Spiral Galaxies). ~80% of the sample have spectra that are essentially identical and that exhibit only absorption features characteristic of the atmospheres of late-type stars. We present a composite near-infrared spectrum that characterizes these "quiescent" galaxies ...
... sample (the ISO Atlas of Bright Spiral Galaxies). ~80% of the sample have spectra that are essentially identical and that exhibit only absorption features characteristic of the atmospheres of late-type stars. We present a composite near-infrared spectrum that characterizes these "quiescent" galaxies ...
PowerPoint プレゼンテーション
... Angle Φ' in fluid rest fame is transformed to angle Φ. Radiation/ fluid motion concentrates in half opening angle 1/Γ. Relativistic beaming effect can be applied for relativistic isotopic ...
... Angle Φ' in fluid rest fame is transformed to angle Φ. Radiation/ fluid motion concentrates in half opening angle 1/Γ. Relativistic beaming effect can be applied for relativistic isotopic ...
The Milky Way Model - University of Chicago
... question: was the Milky Way the whole entire universe or was it just one of many “island universes” located within a much greater system? Eventually a famous astronomer, Edwin Hubble was able to use a powerful telescope to resolve the stars in these spiral nebulae - ending the debate - and measure t ...
... question: was the Milky Way the whole entire universe or was it just one of many “island universes” located within a much greater system? Eventually a famous astronomer, Edwin Hubble was able to use a powerful telescope to resolve the stars in these spiral nebulae - ending the debate - and measure t ...
Low-Res Version - Chandra X
... galaxy. It was formed from a relatively recent (30 million years ago) merger of two smaller galaxies. The merger is causing stars to form, evolve, and explode at an exceptionally rapid rate, creating the large cloud of multimillion degree Celsius gas seen in this image. The central region of the mer ...
... galaxy. It was formed from a relatively recent (30 million years ago) merger of two smaller galaxies. The merger is causing stars to form, evolve, and explode at an exceptionally rapid rate, creating the large cloud of multimillion degree Celsius gas seen in this image. The central region of the mer ...
The Milky Way - The Independent School
... As you begin studying galaxies, you will discover they are classified into different types, and that will lead you to insights into how galaxies form and evolve. In the next chapter, you will discover that some galaxies are violently active, and that will give you more clues to the evolution of gala ...
... As you begin studying galaxies, you will discover they are classified into different types, and that will lead you to insights into how galaxies form and evolve. In the next chapter, you will discover that some galaxies are violently active, and that will give you more clues to the evolution of gala ...
The Hydrogen 21-cm Emission Line
... The 21-cm emission will include contributions of hydrogen at different distances from the galactic center and different Doppler shifts with respect to us. Some of the emission will be from gas clouds just inside the orbit the orbit of the Sun moving at slightly faster angular speeds than the Sun. Th ...
... The 21-cm emission will include contributions of hydrogen at different distances from the galactic center and different Doppler shifts with respect to us. Some of the emission will be from gas clouds just inside the orbit the orbit of the Sun moving at slightly faster angular speeds than the Sun. Th ...
Family Space Day Overview – Galaxies
... Galaxies are large collections of stars and gas and dust. They have millions to billions of stars, all held into a cluster by gravitational attraction. Most galaxies are flat, but there are different shapes — some are spirals, some are elliptical, and some are irregular. Our Galaxy The Milky Way is ...
... Galaxies are large collections of stars and gas and dust. They have millions to billions of stars, all held into a cluster by gravitational attraction. Most galaxies are flat, but there are different shapes — some are spirals, some are elliptical, and some are irregular. Our Galaxy The Milky Way is ...
Messier 87
Messier 87 (also known as Virgo A or NGC 4486, and generally abbreviated to M87) is a supergiant elliptical galaxy in the constellation Virgo. One of the most massive galaxies in the local universe, it is notable for its large population of globular clusters—M87 contains about 12,000 compared to the 150-200 orbiting the Milky Way—and its jet of energetic plasma that originates at the core and extends outward at least 1,500 parsecs (4,900 light-years), travelling at relativistic speed. It is one of the brightest radio sources in the sky, and is a popular target for both amateur astronomy observations and professional astronomy study.French astronomer Charles Messier discovered M87 in 1781, cataloguing it as a nebulous feature while searching for objects that would confuse comet hunters. The second brightest galaxy within the northern Virgo Cluster, M87 is located about 16.4 million parsecs (53.5 million light-years) from Earth. Unlike a disk-shaped spiral galaxy, M87 has no distinctive dust lanes. Instead, it has an almost featureless, ellipsoidal shape typical of most giant elliptical galaxies, diminishing in luminosity with distance from the centre. Forming around one sixth of M87's mass, the stars in this galaxy have a nearly spherically symmetric distribution, their density decreasing with increasing distance from the core. At the core is a supermassive black hole, which forms the primary component of an active galactic nucleus. This object is a strong source of multiwavelength radiation, particularly radio waves. M87's galactic envelope extends out to a radius of about 150 kiloparsecs (490,000 light-years), where it has been truncated—possibly by an encounter with another galaxy. Between the stars is a diffuse interstellar medium of gas that has been chemically enriched by elements emitted from evolved stars.