Wadhurst Astronomical Society Newsletter May 2017
... We were told about another active galaxy called a Starburst Galaxy where it is thought a nearby interacting galaxy is causing intense star formation far faster than in our galaxy, with many more supernovae being created seen in infra-red and x-ray wavelengths, so that there must be a great deal of a ...
... We were told about another active galaxy called a Starburst Galaxy where it is thought a nearby interacting galaxy is causing intense star formation far faster than in our galaxy, with many more supernovae being created seen in infra-red and x-ray wavelengths, so that there must be a great deal of a ...
STEPHAN`S QUINTET
... These galaxies are of interest because of their violent collisions. Four of the five galaxies in Stephan´s Quintet form a physical association, Hickson Compact Group 92, and are involved in a cosmic dance that most likely will end with the galaxies merging. Also of interest, NGC 7320 indicates a sma ...
... These galaxies are of interest because of their violent collisions. Four of the five galaxies in Stephan´s Quintet form a physical association, Hickson Compact Group 92, and are involved in a cosmic dance that most likely will end with the galaxies merging. Also of interest, NGC 7320 indicates a sma ...
Mapping the Stars
... • It is an object that is so massive that even light cannot escape its gravity. • They form sometimes from the leftovers of a supernova that has collapsed. • How are black holes found by astronomers? • Sometimes gas or dust from a nearby star will spiral into the black hole and give off X rays to he ...
... • It is an object that is so massive that even light cannot escape its gravity. • They form sometimes from the leftovers of a supernova that has collapsed. • How are black holes found by astronomers? • Sometimes gas or dust from a nearby star will spiral into the black hole and give off X rays to he ...
The Milky Way: Home to Star Clusters
... spiral galaxy in any sense of the word. On the other hand, it is the most important galaxy known, and is unique because it is the only place we know that harbours life. It is difficult to obtain a clear picture of the Milky Way’s structure as we are living on the inside, looking out across one of it ...
... spiral galaxy in any sense of the word. On the other hand, it is the most important galaxy known, and is unique because it is the only place we know that harbours life. It is difficult to obtain a clear picture of the Milky Way’s structure as we are living on the inside, looking out across one of it ...
The Milky Way as a Spiral galaxy
... •A composite of 77 photographs showing details of the star clouds in the Milky Way. By the early 1900’s the dark areas were understood to be obscuring clouds of dust and gas. This source of interstellar absorption invalidated the star counts Herschel (and later astronomers) used to estimate the siz ...
... •A composite of 77 photographs showing details of the star clouds in the Milky Way. By the early 1900’s the dark areas were understood to be obscuring clouds of dust and gas. This source of interstellar absorption invalidated the star counts Herschel (and later astronomers) used to estimate the siz ...
Teaching Text Structure with Understanding the Scale of the Universe
... By 1920, many scientists began to think that some of the objects they were seeing must be other galaxies like the Milky Way but separate from the Milky Way. They spoke of these separate clusters of stars as island universes. ...
... By 1920, many scientists began to think that some of the objects they were seeing must be other galaxies like the Milky Way but separate from the Milky Way. They spoke of these separate clusters of stars as island universes. ...
Exploring The Universe
... not have a well-defined structure. • Some irregular galaxies may be oddly shaped because the gravitational pull of nearby galaxies distorts their spiral arms. • Contain mostly YOUNG STARS ...
... not have a well-defined structure. • Some irregular galaxies may be oddly shaped because the gravitational pull of nearby galaxies distorts their spiral arms. • Contain mostly YOUNG STARS ...
Archaeology of the Milky Way - Max-Planck
... are so far away that it is generally possible to make statements only about the system as a whole, since it isn’t possible to recognize individual stars. Rix went down a different path years ago. He investigates the galaxy that is closest to us: our Milky Way. “It is only in our own galactic home th ...
... are so far away that it is generally possible to make statements only about the system as a whole, since it isn’t possible to recognize individual stars. Rix went down a different path years ago. He investigates the galaxy that is closest to us: our Milky Way. “It is only in our own galactic home th ...
LOFAR - Veres Péter
... Things to know about LFR: • deeply burried inside the host galaxy • size less than a few tenths of arcsecs • the cause: Refractive Interstellar Scintilation • only present at low frequencies Things to expect • if the LFVs turn out to be high redshift objects they define a clean sample of galaxies • ...
... Things to know about LFR: • deeply burried inside the host galaxy • size less than a few tenths of arcsecs • the cause: Refractive Interstellar Scintilation • only present at low frequencies Things to expect • if the LFVs turn out to be high redshift objects they define a clean sample of galaxies • ...
WFPC2
... The Hubble Deep Field What happens when you stare at a relatively blank piece of sky for 10 days straight? Hubble Astronomers asked this question in 1995, as here’s what we found out… ...
... The Hubble Deep Field What happens when you stare at a relatively blank piece of sky for 10 days straight? Hubble Astronomers asked this question in 1995, as here’s what we found out… ...
charts_set_9
... - contains young and old stars, gas, dust. Has spiral structure - vertical thickness roughly 100 pc - 2 kpc (depending on component. Most gas and dust in thinner layer, most stars in thicker layer) ...
... - contains young and old stars, gas, dust. Has spiral structure - vertical thickness roughly 100 pc - 2 kpc (depending on component. Most gas and dust in thinner layer, most stars in thicker layer) ...
AS1001:Extra-Galactic Astronomy Stars and Gas in Galaxies
... • Pre-dates rotation curve observations and analysis (1975). • Galaxies in clusters have very large observed velocities ( v ~ 1000 km/s ). • Galaxy clusters should be unbound! • But clusters ARE bound, so more mass must be present than the luminous matter. • Dark Matter needed to bind galaxy cl ...
... • Pre-dates rotation curve observations and analysis (1975). • Galaxies in clusters have very large observed velocities ( v ~ 1000 km/s ). • Galaxy clusters should be unbound! • But clusters ARE bound, so more mass must be present than the luminous matter. • Dark Matter needed to bind galaxy cl ...
Section9 - University of Chicago
... Consider a uniform spherical region with the following basic properties: temperature, T, uniform density, ρ, and size (radius), R. The total mass, M, ...
... Consider a uniform spherical region with the following basic properties: temperature, T, uniform density, ρ, and size (radius), R. The total mass, M, ...
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 ...
AS2001 - University of St Andrews
... Near centre of galaxy: Shorter orbit period--> More passes thru spiral shocks --> More star generations --> m lower --> Z higher. (Also, more infall of IGM on outskirts.) ...
... Near centre of galaxy: Shorter orbit period--> More passes thru spiral shocks --> More star generations --> m lower --> Z higher. (Also, more infall of IGM on outskirts.) ...
COMING EVENTS The Pluto Files Volume 37 Number 03 March
... Herschel finds less dark matter but more stars Herschel Press Release ESA’s Herschel space observatory has discovered a population of dust-enshrouded galaxies that do not need as much dark matter as previously thought to collect gas and burst into star formation. The galaxies are far away and each ...
... Herschel finds less dark matter but more stars Herschel Press Release ESA’s Herschel space observatory has discovered a population of dust-enshrouded galaxies that do not need as much dark matter as previously thought to collect gas and burst into star formation. The galaxies are far away and each ...
Chapter 5 Galaxies and Star Systems
... spiral galaxies, called barred-spiral galaxies, have a huge bar-shaped region of stars and gas that passes through their center. Not all galaxies have spiral arms. Elliptical galaxies look like round or flattened balls. These galaxies contain billions of the stars but have little gas and dust betwee ...
... spiral galaxies, called barred-spiral galaxies, have a huge bar-shaped region of stars and gas that passes through their center. Not all galaxies have spiral arms. Elliptical galaxies look like round or flattened balls. These galaxies contain billions of the stars but have little gas and dust betwee ...
How do the most massive galaxies constrain theories of
... Why are red galaxies red? o CDM models produce enough old, massive galaxies. the problem is a continuous ‘trickle’ of star formation o there must be some process that shuts off star formation after galaxies have become massive o this process must be rapid, and seems to be connected with the presenc ...
... Why are red galaxies red? o CDM models produce enough old, massive galaxies. the problem is a continuous ‘trickle’ of star formation o there must be some process that shuts off star formation after galaxies have become massive o this process must be rapid, and seems to be connected with the presenc ...
The Galaxy Presentation 2011
... •Early 1900’s - Kapteyn used stellar parallax to estimate the true size of the Galaxy Kapteyn Universe •10kpc diameter and 2kpc thick with the Sun less than a kpc from the center (rather heliocentric) •Tried to estimate Rayleigh scattering due to ISM gas but determined it to be insignificant (bec ...
... •Early 1900’s - Kapteyn used stellar parallax to estimate the true size of the Galaxy Kapteyn Universe •10kpc diameter and 2kpc thick with the Sun less than a kpc from the center (rather heliocentric) •Tried to estimate Rayleigh scattering due to ISM gas but determined it to be insignificant (bec ...
Conference Summary Richard Ellis (Caltech) ITALIA
... • How did the Hubble Sequence emerge at z<1 from the varied active and irregular sources at z > 2? What are the physical processes involved? Are the detailed models correct? • z > 6 the final frontier: did early galaxies reionize the Universe and what early feedback processes shape the later assembl ...
... • How did the Hubble Sequence emerge at z<1 from the varied active and irregular sources at z > 2? What are the physical processes involved? Are the detailed models correct? • z > 6 the final frontier: did early galaxies reionize the Universe and what early feedback processes shape the later assembl ...
Chapter 14 The Milky Way Galaxy
... spiral arms, the increased density triggers star formation. This may contribute to propagation of the arms. The origin of the spiral arms is not yet understood. ...
... spiral arms, the increased density triggers star formation. This may contribute to propagation of the arms. The origin of the spiral arms is not yet understood. ...
Star Planet - Stony Brook Astronomy
... Astronomers see a bright supernova explode in the Andromeda galaxy (the nearest big galaxy in the local group; located 2.6 million ly away). The remnants from such explosions disperse in about 10,000 years. ...
... Astronomers see a bright supernova explode in the Andromeda galaxy (the nearest big galaxy in the local group; located 2.6 million ly away). The remnants from such explosions disperse in about 10,000 years. ...
ASTR 105 Intro Astronomy: The Solar System
... A moderately large object that orbits a star. Planets may be rocky, icy, or gaseous in ...
... A moderately large object that orbits a star. Planets may be rocky, icy, or gaseous in ...
Assignment 10
... ____ 11. The Andromeda Galaxy (our nearest spiral neighbor) has spectral lines that show a blue shift. From this we may conclude that: a. the universe is no longer expanding b. this particular galaxy is moving toward us c. this galaxy has merged with the Milky Way and is now part of it d. this part ...
... ____ 11. The Andromeda Galaxy (our nearest spiral neighbor) has spectral lines that show a blue shift. From this we may conclude that: a. the universe is no longer expanding b. this particular galaxy is moving toward us c. this galaxy has merged with the Milky Way and is now part of it d. this part ...
Galaxy
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A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas and dust, and dark matter. The word galaxy is derived from the Greek galaxias (γαλαξίας), literally ""milky"", a reference to the Milky Way. Galaxies range in size from dwarfs with just a few thousand (103) stars to giants with one hundred trillion (1014) stars, each orbiting their galaxy's own center of mass. Galaxies are categorized according to their visual morphology, including elliptical, spiral, and irregular. Many galaxies are thought to have black holes at their active centers. The Milky Way's central black hole, known as Sagittarius A*, has a mass four million times greater than our own Sun. As of July 2015, EGSY8p7 is the oldest and most distant galaxy with a light travel distance of 13.2 billion light-years from Earth, and observed as it existed 570 million years after the Big Bang. Previously, as of May 2015, EGS-zs8-1 was the most distant known galaxy, estimated to have a light travel distance of 13.1 billion light-years away and to have 15% of the mass of the Milky Way.Approximately 170 billion (1.7 × 1011) to 200 billion (2.0 × 1011) galaxies exist in the observable universe. Most of the galaxies are 1,000 to 100,000 parsecs in diameter and usually separated by distances on the order of millions of parsecs (or megaparsecs). The space between galaxies is filled with a tenuous gas with an average density less than one atom per cubic meter. The majority of galaxies are gravitationally organized into associations known as galaxy groups, clusters, and superclusters. At the largest scale, these associations are generally arranged into sheets and filaments that are surrounded by immense voids.