Chapter 26
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chapter19 - Empyrean Quest Publishers
... Dusty gas clouds obscure our view because they absorb visible light This is the interstellar medium that makes new star systems ...
... Dusty gas clouds obscure our view because they absorb visible light This is the interstellar medium that makes new star systems ...
Lecture 8: The distance ladder
... (L / 3 × 1010 Lsolar) ≈ (vmax / 200 km/s)4 – where the velocity quantity is now the rotational speed at the maxima of the gas spectrum – so work out L from the T-F relation, measure flux F and get d • again this has a physical basis: – from the circular velocity formula, M ∝ vmax2 Rd – again as ...
... (L / 3 × 1010 Lsolar) ≈ (vmax / 200 km/s)4 – where the velocity quantity is now the rotational speed at the maxima of the gas spectrum – so work out L from the T-F relation, measure flux F and get d • again this has a physical basis: – from the circular velocity formula, M ∝ vmax2 Rd – again as ...
81 KB - CSIRO Publishing
... interactions (mergers, tidal stripping, etc.) can change the nature of an object over time. The criteria listed above apply to objects today and not their past or future state. Below we briefly mention some special cases of stellar systems which challenge attempts to define a galaxy. 4 Special Cases ...
... interactions (mergers, tidal stripping, etc.) can change the nature of an object over time. The criteria listed above apply to objects today and not their past or future state. Below we briefly mention some special cases of stellar systems which challenge attempts to define a galaxy. 4 Special Cases ...
The first billion years of galaxy formation and evolution
... For the first time it will be possible to do a detailed characterization of the ISM in primeval galaxies during the epoch of reionization This will revolutionize our understanding of galaxy formation and evolution at all cosmic epochs ...
... For the first time it will be possible to do a detailed characterization of the ISM in primeval galaxies during the epoch of reionization This will revolutionize our understanding of galaxy formation and evolution at all cosmic epochs ...
v = H o χ d “Hubble`s Law”
... A. Thermal radiation from a massive star cluster B. Emission lines from hot gas C. 21 cm from hydrogen gas D. H-alpha from hydrogen gas E. Synchrotron radiation from a black hole ...
... A. Thermal radiation from a massive star cluster B. Emission lines from hot gas C. 21 cm from hydrogen gas D. H-alpha from hydrogen gas E. Synchrotron radiation from a black hole ...
Galaxies - Indiana University Astronomy
... At least two supernovae have been detected in recent years in the nearby Whirlpool Galaxy, Messier 51. M51 is located at a distance of about 31 million light years (about 10 megaparsecs) in the direction of the constellation Canes Venatici. Stars can explode as supernovae in different ways, and the ...
... At least two supernovae have been detected in recent years in the nearby Whirlpool Galaxy, Messier 51. M51 is located at a distance of about 31 million light years (about 10 megaparsecs) in the direction of the constellation Canes Venatici. Stars can explode as supernovae in different ways, and the ...
Quasars- The Brightest Black Holes
... advantage of such an event is that we always know the position of the Moon exactly. If one then compares the precise location of the edge of its disc against the sky at the moments when the radio signal from 3C273 first disappeared and then re-emerged, the intersection of the two arcs pinpoints the ...
... advantage of such an event is that we always know the position of the Moon exactly. If one then compares the precise location of the edge of its disc against the sky at the moments when the radio signal from 3C273 first disappeared and then re-emerged, the intersection of the two arcs pinpoints the ...
Chapter 20. Galaxies
... AGNs that are predominantly found at high redshift (i.e. very distant from us). This is partly because they are a rare phenomenon and partly because they were more common earlier in the history of the Universe. Quasars occur when the central black holes are massive and fed large amounts of gas, resu ...
... AGNs that are predominantly found at high redshift (i.e. very distant from us). This is partly because they are a rare phenomenon and partly because they were more common earlier in the history of the Universe. Quasars occur when the central black holes are massive and fed large amounts of gas, resu ...
Introduction
... to stars. These stars return much of their mass, often enriched in “metals” – elements heavier than H and He – to the interstellar medium (ISM). Stellar evolution also yields remnants which add to the dark matter content, and both stars and gas may be accreted by black holes. Galaxies are sometimes ...
... to stars. These stars return much of their mass, often enriched in “metals” – elements heavier than H and He – to the interstellar medium (ISM). Stellar evolution also yields remnants which add to the dark matter content, and both stars and gas may be accreted by black holes. Galaxies are sometimes ...
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.