Galaxies * Island universes
... A Galaxy’s color evolves from bluer, towards redder as stellar population ages, young blue stars die out Galaxy collisions common because they’re usually only 100 or fewer galaxy diameters apart Collisions between galaxies produce irregulars which settle into ellipticals More massive ellipticals hav ...
... A Galaxy’s color evolves from bluer, towards redder as stellar population ages, young blue stars die out Galaxy collisions common because they’re usually only 100 or fewer galaxy diameters apart Collisions between galaxies produce irregulars which settle into ellipticals More massive ellipticals hav ...
astro2_lec1 - Astronomy & Astrophysics Group
... distances to dozens of nebulae. Even the nearest, in Andromeda, was millions of light ...
... distances to dozens of nebulae. Even the nearest, in Andromeda, was millions of light ...
The Dance of the Fertile Universe
... need a very hot piece of the universe to do this, and so you can only get this thermonuclear furnace by having a cloud collapse and raise the temperature. You can only get it, in other words, in stars, with one exception, namely, in the very hot early universe before galaxies or stars were born. Sta ...
... need a very hot piece of the universe to do this, and so you can only get this thermonuclear furnace by having a cloud collapse and raise the temperature. You can only get it, in other words, in stars, with one exception, namely, in the very hot early universe before galaxies or stars were born. Sta ...
It is now recognized that the vast majority of ellipticals are of
... brightnesses. As , we can substitute the previous correlation and see that and therefore: ...
... brightnesses. As , we can substitute the previous correlation and see that and therefore: ...
Thermonuclear Reactions: The Beginning and the
... m is the earth's mass (5.94×1024 kg), a rocket (mass mx) must have a velocity of about 11 km/s to escape from the earth's surface (the escape velocity, ve). Conversely, for a given velocity, ve, one can calculate the mass and size of the large body needed to hamper such an escape. A body with our so ...
... m is the earth's mass (5.94×1024 kg), a rocket (mass mx) must have a velocity of about 11 km/s to escape from the earth's surface (the escape velocity, ve). Conversely, for a given velocity, ve, one can calculate the mass and size of the large body needed to hamper such an escape. A body with our so ...
Lecture 13 Local group chapter 4 of S+G
... γ-ray emission correlates with massive star forming regions and not with the gas distribution (simulated images if the γ-ray emission was distributed like the source) • Compactness of emission regions suggests little CR diffusion • 30 Doradus star forming region is a bright source of gamma rays and ...
... γ-ray emission correlates with massive star forming regions and not with the gas distribution (simulated images if the γ-ray emission was distributed like the source) • Compactness of emission regions suggests little CR diffusion • 30 Doradus star forming region is a bright source of gamma rays and ...
Origin of the Chemical Elements
... energy density fluctuations with the characteristics found in CMBR. One conjectures that the large-scale homogeneity of the Universe is due to a very early period of exponential inflation in its scale (Peebles 1993). One assumes that during the first era after the Big Bang the size of the causally c ...
... energy density fluctuations with the characteristics found in CMBR. One conjectures that the large-scale homogeneity of the Universe is due to a very early period of exponential inflation in its scale (Peebles 1993). One assumes that during the first era after the Big Bang the size of the causally c ...
D109-08x
... galaxies. The images, taken over several wavelengths, provide evidence of the "galactic assault and battery," namely, gas being stripped from the doomed galaxy, called C153. The composite photograph at left was made by combining the four images at right, taken in X-ray, radio, and visible wavelength ...
... galaxies. The images, taken over several wavelengths, provide evidence of the "galactic assault and battery," namely, gas being stripped from the doomed galaxy, called C153. The composite photograph at left was made by combining the four images at right, taken in X-ray, radio, and visible wavelength ...
... Stellar and Gas Content of Galaxies • Other items of note: – Ellipticals have a large range of sizes from globular cluster sizes to 100 times the mass of the Milky Way – Census of galaxies nearby: Most are dim dwarf E and dwarf Irr sparsely populated with stars – Census of distant galaxies: In clus ...
Order-of-Magnitude Astrophysics
... 48. The FAME (Full-Sky Astrometric Mapping Explorer) satellite mission is expected to last 2.5-5 years and to have an astrometric precision of roughly 17, 60, and 150 micro-arcseconds respectively for sources with apparent magnitudes V = 9, 12, and 15. How many extra-solar planets will FAME find? 49 ...
... 48. The FAME (Full-Sky Astrometric Mapping Explorer) satellite mission is expected to last 2.5-5 years and to have an astrometric precision of roughly 17, 60, and 150 micro-arcseconds respectively for sources with apparent magnitudes V = 9, 12, and 15. How many extra-solar planets will FAME find? 49 ...
Are Gamma-Ray Bursts good Star Formation Indicators?
... overestimated. In fact, the discrepancy may be worse since the 3 hosts which are confidently (>3σ) detected at 850μm are not representative of typical submm selected galaxies: they are faint and blue, with little evidence of optical extinction, and lie at z<1.5. It is possible that current samples a ...
... overestimated. In fact, the discrepancy may be worse since the 3 hosts which are confidently (>3σ) detected at 850μm are not representative of typical submm selected galaxies: they are faint and blue, with little evidence of optical extinction, and lie at z<1.5. It is possible that current samples a ...
Chapter 14 The Milky Way Galaxy
... • Galactic rotation curve shows large amounts of undetectable mass at large radii; called dark matter. • Activity near galactic center suggests presence of a 3.7-million-solar-mass black hole. ...
... • Galactic rotation curve shows large amounts of undetectable mass at large radii; called dark matter. • Activity near galactic center suggests presence of a 3.7-million-solar-mass black hole. ...
First Light Sources at the End of the Dark Ages: Direct
... limit on, the size of the local bubble. An exposure time of 4 hours will allow detections in the range of ~6 x 10-19 erg/s/cm2 for 25-30-meter class telescopes. When strong Lyman ! emitters are found, both the Lyman ! and the HeII lines can be observed with R>3000 spectroscopy using a GSMT. Observat ...
... limit on, the size of the local bubble. An exposure time of 4 hours will allow detections in the range of ~6 x 10-19 erg/s/cm2 for 25-30-meter class telescopes. When strong Lyman ! emitters are found, both the Lyman ! and the HeII lines can be observed with R>3000 spectroscopy using a GSMT. Observat ...
Galaxy Questions Info
... A spiral galaxy consists of a flattened disk containing spiral (pinwheel-shaped) arms, a bulge at its center, and a halo. Spiral galaxies have a variety of shapes, and they are classified according to the size of the bulge and the tightness and appearance of the arms. The spiral arms, which wrap aro ...
... A spiral galaxy consists of a flattened disk containing spiral (pinwheel-shaped) arms, a bulge at its center, and a halo. Spiral galaxies have a variety of shapes, and they are classified according to the size of the bulge and the tightness and appearance of the arms. The spiral arms, which wrap aro ...
Quiz Reviews - Orion Observatory
... 3. How was the term “Big Bang” coined, and did any steady-state theorists deny the Big Bang after the cosmic microwave background was discovered? 4. What is the cosmic microwave background radiation? Why did it have to exist? How was it discovered? Who got credit for discovering it? 5. Why did ripp ...
... 3. How was the term “Big Bang” coined, and did any steady-state theorists deny the Big Bang after the cosmic microwave background was discovered? 4. What is the cosmic microwave background radiation? Why did it have to exist? How was it discovered? Who got credit for discovering it? 5. Why did ripp ...
implication on the mass and
... The solid line evolves as (1+z)3.9 and represents the best fit of the total IR luminosity density at 0
... The solid line evolves as (1+z)3.9 and represents the best fit of the total IR luminosity density at 0
STEPHAN`S QUINTET
... Stephan's Quintet in the constellation Pegasus is al grouping of five galaxies of which four form the first compact galaxy group ever discovered. The group was discovered by Édouard Stephan in 1877 at Marseilles Observatory. These galaxies are of interest because of their violent collisions. Four of ...
... Stephan's Quintet in the constellation Pegasus is al grouping of five galaxies of which four form the first compact galaxy group ever discovered. The group was discovered by Édouard Stephan in 1877 at Marseilles Observatory. These galaxies are of interest because of their violent collisions. Four of ...
A Journey... Back To The Beginning of Time!
... a. What are they and how are they formed? b. What significance does this have on the universe? 3. Stellar evolution: a. How are stars created? b. What is the life cycle of a star? c. What are the determining factors that causes a star to die? 4. Galaxies: a. What has happened/is happening to our gal ...
... a. What are they and how are they formed? b. What significance does this have on the universe? 3. Stellar evolution: a. How are stars created? b. What is the life cycle of a star? c. What are the determining factors that causes a star to die? 4. Galaxies: a. What has happened/is happening to our gal ...
Quasars- The Brightest Black Holes
... In 1962 an opportunity arose for a much clearer determination of the position of one of these powerful but as yet unidentified sources, 3C273, when it would be eclipsed by the Moon three times - in May, August and October. The advantage of such an event is that we always know the position of the Mo ...
... In 1962 an opportunity arose for a much clearer determination of the position of one of these powerful but as yet unidentified sources, 3C273, when it would be eclipsed by the Moon three times - in May, August and October. The advantage of such an event is that we always know the position of the Mo ...
Distance - Fixed Earth
... Quotation: "The Cosmological Redshift is a redshift caused by the expansion of space. The wavelength of light increases as it traverses the expanding universe.... The Gravitational Redshift is a shift in the frequency of a photon to lower energy as it climbs out of a gravitational field...." 16 Com ...
... Quotation: "The Cosmological Redshift is a redshift caused by the expansion of space. The wavelength of light increases as it traverses the expanding universe.... The Gravitational Redshift is a shift in the frequency of a photon to lower energy as it climbs out of a gravitational field...." 16 Com ...
Galaxies - cloudfront.net
... dust. Most of their stars are young and blue in color. • Elliptical galaxies are more-or-less egg shaped. The smallest elliptical galaxies are as small as some globular clusters. The largest elliptical galaxies can contain over a trillion stars. Most stars in elliptical galaxies are reddish to yello ...
... dust. Most of their stars are young and blue in color. • Elliptical galaxies are more-or-less egg shaped. The smallest elliptical galaxies are as small as some globular clusters. The largest elliptical galaxies can contain over a trillion stars. Most stars in elliptical galaxies are reddish to yello ...
DTU 8e Chap 17 Quasars and Other Active Galaxies
... An active galaxy is an extremely luminous galaxy that has one or more unusual features: an unusually bright, starlike nucleus; strong emission lines in its spectrum; rapid variations in luminosity; and jets or beams of radiation that emanate from its core. Active galaxies include quasars, Seyfert ga ...
... An active galaxy is an extremely luminous galaxy that has one or more unusual features: an unusually bright, starlike nucleus; strong emission lines in its spectrum; rapid variations in luminosity; and jets or beams of radiation that emanate from its core. Active galaxies include quasars, Seyfert ga ...
Gravity, General Relativity, and Dark Matter
... object (like a rock)—always moves in a straight line, and with the same speed, unless there is a force to make it slow down, speed up, or change direction. To help illustrate this idea, we consider some examples. We start with a rock sliding on the ground. It slows down because of the force of frict ...
... object (like a rock)—always moves in a straight line, and with the same speed, unless there is a force to make it slow down, speed up, or change direction. To help illustrate this idea, we consider some examples. We start with a rock sliding on the ground. It slows down because of the force of frict ...
Characteristics of Our Galaxy
... examining the specific structure and composition of the Milky Way. Finally, a most probable formation scenario for the early stages of the evolution of the Galaxy is proposed. ...
... examining the specific structure and composition of the Milky Way. Finally, a most probable formation scenario for the early stages of the evolution of the Galaxy is proposed. ...