main characteristics of the emission from elliptical galaxies
... Elliptical galaxies are one of the most characteristic objects we can nd in the sky. In order to unveil their properties, such as their structure or chemical composition, one must study their spectral emission. In fact they seem to behave rather dierently when observed with dierent eyes. This is ...
... Elliptical galaxies are one of the most characteristic objects we can nd in the sky. In order to unveil their properties, such as their structure or chemical composition, one must study their spectral emission. In fact they seem to behave rather dierently when observed with dierent eyes. This is ...
18Galaxies - NMSU Astronomy
... • Sometimes the balls are a little squashed, but they’re never flat like spirals • Elliptical galaxies don’t seem to have very much interstellar matter, so new stars are not forming, so most of the stars are old. • Some galaxies don’t fit nicely into either of these two categories, and are called ir ...
... • Sometimes the balls are a little squashed, but they’re never flat like spirals • Elliptical galaxies don’t seem to have very much interstellar matter, so new stars are not forming, so most of the stars are old. • Some galaxies don’t fit nicely into either of these two categories, and are called ir ...
Word doc - UC-HiPACC - University of California, Santa Cruz
... horizon” beyond which light cannot escape—is known to be a quarter the radius of Mercury’s orbit. But that entire volume is jam-packed with a mass 4 million times greater than our Sun. Starvation diet Weirdly, Sgr A* “is the most underluminous black hole observed,” remarked Peter Anninos of Lawrence ...
... horizon” beyond which light cannot escape—is known to be a quarter the radius of Mercury’s orbit. But that entire volume is jam-packed with a mass 4 million times greater than our Sun. Starvation diet Weirdly, Sgr A* “is the most underluminous black hole observed,” remarked Peter Anninos of Lawrence ...
Chapter 12 Quiz, Nov. 28, 2012, Astro 162, Section 4 12-1
... 12-30. Synchrotron radiation, a form of polarized electromagnetic radiation, has a spectrum that shows larger intensity for lower frequency. Such radiation has been observed to come from quasars and is produced by a) very hot objects. b) very cold objects. c) charged particles moving in a magnetic ...
... 12-30. Synchrotron radiation, a form of polarized electromagnetic radiation, has a spectrum that shows larger intensity for lower frequency. Such radiation has been observed to come from quasars and is produced by a) very hot objects. b) very cold objects. c) charged particles moving in a magnetic ...
Cartwheel Galaxy - Chandra X
... 8. Is there an X-ray candidate for an active galactic nucleus (AGN) in Arp 147? Explain. 9. Why might there not be new star formation in the elliptical galaxy on the left? 10. A study of ULXs has determined that very few X-ray sources with luminosity greater than 1040 erg s−1 remain after ~15 Myr a ...
... 8. Is there an X-ray candidate for an active galactic nucleus (AGN) in Arp 147? Explain. 9. Why might there not be new star formation in the elliptical galaxy on the left? 10. A study of ULXs has determined that very few X-ray sources with luminosity greater than 1040 erg s−1 remain after ~15 Myr a ...
HIERARCHICAL GALAXY ASSEMBLY AND ITS MANIFESTATIONS
... Colour-colour relations at z~2: star-forming vs passive galaxies ...
... Colour-colour relations at z~2: star-forming vs passive galaxies ...
Our galaxy, the Milky Way, has about 3 billion solar masses of HI
... their distance by some means such as stellar parallax or some other method. Once the luminosity a these stars are measured (by comparing their apparent magnitudes and their distance) and once the luminosity is established as constant for all objects of that class, then the luminosity of one of these ...
... their distance by some means such as stellar parallax or some other method. Once the luminosity a these stars are measured (by comparing their apparent magnitudes and their distance) and once the luminosity is established as constant for all objects of that class, then the luminosity of one of these ...
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.