Evolved Stellar Populations
... stars allows to estimate variations in meanage and metallicity across stellar populations. Modest but complete samples produce ...
... stars allows to estimate variations in meanage and metallicity across stellar populations. Modest but complete samples produce ...
TEKS 8.13 A, B, and C
... Galaxies are made up of many billions of stars, dust and gas all held together by gravity. Galaxies are scattered throughout the universe. Galaxies are so far away that we can’t make out individual stars. They vary greatly in size and shape. Until the 1920s astronomers did not have a classification ...
... Galaxies are made up of many billions of stars, dust and gas all held together by gravity. Galaxies are scattered throughout the universe. Galaxies are so far away that we can’t make out individual stars. They vary greatly in size and shape. Until the 1920s astronomers did not have a classification ...
The Next 2-3 Weeks
... • The Schwarzschild metric (= non-rotating black hole) • “The orbit of a satellite” (somewhat flakey example) I will present additional material assuming that you have read at least 17.2. ...
... • The Schwarzschild metric (= non-rotating black hole) • “The orbit of a satellite” (somewhat flakey example) I will present additional material assuming that you have read at least 17.2. ...
2013. CCAT. All Rights Reserved.
... the star formation and the buildup of heavy elements. Of particular interest is the early period, from approximately 500 million to 3 billion years after the Big Bang (corresponding to redshift ~10 to redshift ~2), in which the first generation of stars began enriching the medium, the Universe was r ...
... the star formation and the buildup of heavy elements. Of particular interest is the early period, from approximately 500 million to 3 billion years after the Big Bang (corresponding to redshift ~10 to redshift ~2), in which the first generation of stars began enriching the medium, the Universe was r ...
ATA2010
... be unrecognisable: their debris will be dispersed right around the Galaxy. But … We can use their chemical signatures over many chemical elements to identify their debris: • stars from a common cluster have similar chemical signatures, and their chemical properties vary from cluster to cluster • sta ...
... be unrecognisable: their debris will be dispersed right around the Galaxy. But … We can use their chemical signatures over many chemical elements to identify their debris: • stars from a common cluster have similar chemical signatures, and their chemical properties vary from cluster to cluster • sta ...
Separating Stars and Galaxies Based on Color
... If a high resolution spectrum is available for an object, star/galaxy classification is almost always trivial, as spectral features unique to stars or galaxies are easily identifiable. However, due to limitations in telescope time and current detector technology, we do not have a spectrum for each o ...
... If a high resolution spectrum is available for an object, star/galaxy classification is almost always trivial, as spectral features unique to stars or galaxies are easily identifiable. However, due to limitations in telescope time and current detector technology, we do not have a spectrum for each o ...
Quasars
... Quasars are the brightest type of active galactic nucleus. The viewpoint now is that a supermassive black hole is consuming stars and gas and dust clouds in their near vacinity and creating an accretion disk of matter which is compressed and accelerated to near luminous speeds (the speed of light) a ...
... Quasars are the brightest type of active galactic nucleus. The viewpoint now is that a supermassive black hole is consuming stars and gas and dust clouds in their near vacinity and creating an accretion disk of matter which is compressed and accelerated to near luminous speeds (the speed of light) a ...
Quasars- The Brightest Black Holes
... more and more quasars to the present day – hundreds of thousands of these objects are now known. They litter the Universe; the most distant yet discovered is so far away that the time it takes its light to reach us means that we are seeing it as it was when the Universe was just 770 million years ol ...
... more and more quasars to the present day – hundreds of thousands of these objects are now known. They litter the Universe; the most distant yet discovered is so far away that the time it takes its light to reach us means that we are seeing it as it was when the Universe was just 770 million years ol ...
Our Galaxy
... 23-4 The evidence for the existence of dark matter in our Galaxy 23-5 What causes the Milky Way’s spiral arms to form and persist 23-6 How astronomers discovered a supermassive black hole at the galactic center ...
... 23-4 The evidence for the existence of dark matter in our Galaxy 23-5 What causes the Milky Way’s spiral arms to form and persist 23-6 How astronomers discovered a supermassive black hole at the galactic center ...
Cosmology and Particle Physics
... called a Doppler shift, it is notspace itself is expanding. There is no center of expansion in the universe. All observers see themselves as stationary; the other objects in space appear to be moving away from them. Hubble was directly responsible for discovering that the universe was much larger t ...
... called a Doppler shift, it is notspace itself is expanding. There is no center of expansion in the universe. All observers see themselves as stationary; the other objects in space appear to be moving away from them. Hubble was directly responsible for discovering that the universe was much larger t ...
Local group
... irregulars with low mass; most are satellites of MW, M31 or M33 • The gravitational interaction between these systems is complex but the local group is apparently bound. • Major advantages – close and bright- all nearby enough that individual stars can be well measured as well as HI, H2, IR, x-ray s ...
... irregulars with low mass; most are satellites of MW, M31 or M33 • The gravitational interaction between these systems is complex but the local group is apparently bound. • Major advantages – close and bright- all nearby enough that individual stars can be well measured as well as HI, H2, IR, x-ray s ...
THREE INTRIGUER NEBULAE IN CONSTELLATION CARINA
... (Hopp & Materne 1985, Nakazawa et al. 2000) that is the third nearest galaxy cluster to us, inhabiting the eastern part of this constellation (see picture on first page). Antlia cluster, also known as ACO S 0636, is centered at R.A. 10h 30m 01s Dec. –35° 19´ 35”. With a galactic latitude of 19 degr ...
... (Hopp & Materne 1985, Nakazawa et al. 2000) that is the third nearest galaxy cluster to us, inhabiting the eastern part of this constellation (see picture on first page). Antlia cluster, also known as ACO S 0636, is centered at R.A. 10h 30m 01s Dec. –35° 19´ 35”. With a galactic latitude of 19 degr ...
Hubble - STScI
... observations provided the deepest views of the cosmos in visible, ultraviolet, and nearinfrared light. In the most recent foray into the farthest regions of the universe, Hubble uncovered 10,000 galaxies, some of which existed 400 to 800 million years after the Big Bang. Unlike our Milky Way Galaxy, ...
... observations provided the deepest views of the cosmos in visible, ultraviolet, and nearinfrared light. In the most recent foray into the farthest regions of the universe, Hubble uncovered 10,000 galaxies, some of which existed 400 to 800 million years after the Big Bang. Unlike our Milky Way Galaxy, ...
Into the sub-mm
... sources. Sub-mm observations over recent years have enabled significant progress to be made in the understanding of low-mass star formation. ...
... sources. Sub-mm observations over recent years have enabled significant progress to be made in the understanding of low-mass star formation. ...
POISE AND EVOLUTION OF THE GALAXY : STRUCTURE ,
... reconstituted shape is by no way exceptional : quite a lot of galaxies, probably spiral as seen edgeon, in profile, indeed, display such a sandwich structure in direct observation, through the lengthy side (ex. : M104 , ESO510 , NGC 678/ 891 / 4013 / 4565 / 5866/ 7814 …) [Fig. 1b, 1c] . Even the dis ...
... reconstituted shape is by no way exceptional : quite a lot of galaxies, probably spiral as seen edgeon, in profile, indeed, display such a sandwich structure in direct observation, through the lengthy side (ex. : M104 , ESO510 , NGC 678/ 891 / 4013 / 4565 / 5866/ 7814 …) [Fig. 1b, 1c] . Even the dis ...
Chapter 16 - Astronomy
... 6. Since there are no white dwarfs near the Sun, this portion of the Galactic disk must be no older than about 10 billion years. 7. The presence of O- and B-type stars primarily near the Galactic plane suggests that star formation does not occur to any great extent except along the plane. 8. Stars i ...
... 6. Since there are no white dwarfs near the Sun, this portion of the Galactic disk must be no older than about 10 billion years. 7. The presence of O- and B-type stars primarily near the Galactic plane suggests that star formation does not occur to any great extent except along the plane. 8. Stars i ...
The Milky Way - TCNJ | The College of New Jersey
... • Dust, mainly in molecular clouds, shrouds the Disk; we see few stars beyond 2 kpc from SS in the thin disk, where the number of stars is much greater • Originally astronomers thought the Milky Way WAS the Whole Universe & SS central to it (because of visible light extinction by dust) • Location of ...
... • Dust, mainly in molecular clouds, shrouds the Disk; we see few stars beyond 2 kpc from SS in the thin disk, where the number of stars is much greater • Originally astronomers thought the Milky Way WAS the Whole Universe & SS central to it (because of visible light extinction by dust) • Location of ...
The Planetarium Fleischmann Planetarium
... team also produced a composite image of the Helix that combines observations from Hubble’s Advanced Camera for Surveys and the 4-meter telescope’s mosaic camera at Cerro Tololo. The Helix is so large that the team needed both telescopes to capture a complete view. Hubble observed the Helix’s central ...
... team also produced a composite image of the Helix that combines observations from Hubble’s Advanced Camera for Surveys and the 4-meter telescope’s mosaic camera at Cerro Tololo. The Helix is so large that the team needed both telescopes to capture a complete view. Hubble observed the Helix’s central ...
Stellar population models in the Near-Infrared Meneses
... with models constructed according to a slightly different prescription than the classical stellar population synthesis. In this approach we only partially populate the points on each stellar isochrone, leaving out the points corresponding to the AGB phase. During the spectral fiting, we instead allo ...
... with models constructed according to a slightly different prescription than the classical stellar population synthesis. In this approach we only partially populate the points on each stellar isochrone, leaving out the points corresponding to the AGB phase. During the spectral fiting, we instead allo ...
relativistic time correction on movement of distant galaxies
... The latest information of the farthest galaxy is GN z11, having red shift 11. It is at apparent distance of 13.4 billion light years from Earth. That means, light that we have just received is giving information about 13.4 billion years old. This galaxy is reported to be containing stars. Suppose th ...
... The latest information of the farthest galaxy is GN z11, having red shift 11. It is at apparent distance of 13.4 billion light years from Earth. That means, light that we have just received is giving information about 13.4 billion years old. This galaxy is reported to be containing stars. Suppose th ...
lab 11 only - Penn State University
... The celestial sphere is divided up in a system like the \longitude-latitude" system on the Earth's surface. The latitude of an object in the sky is called the declination; an object (like Polaris) whose position is over the Earth's north pole has a declination of +90 degrees; an object over the sout ...
... The celestial sphere is divided up in a system like the \longitude-latitude" system on the Earth's surface. The latitude of an object in the sky is called the declination; an object (like Polaris) whose position is over the Earth's north pole has a declination of +90 degrees; an object over the sout ...
Estimating the mass and star formation rate in galaxies
... There are several advantages in studying the universe in the infrared. The most important one is the fact that we are less affected by extinction. As light pass though space, dust absorbs a fraction of this. The exact amount depends primarily on the total quantity of dust between ...
... There are several advantages in studying the universe in the infrared. The most important one is the fact that we are less affected by extinction. As light pass though space, dust absorbs a fraction of this. The exact amount depends primarily on the total quantity of dust between ...
The cosmic distance scale
... Use the relation you found in one of the preparatory exercises and the min/max magnitudes of each Cepheid to calculate the observed mean magnitudes. These have to be corrected for interstellar extinction. The light traveling to us from M100 is not just passing through the vacuum of space, some of it ...
... Use the relation you found in one of the preparatory exercises and the min/max magnitudes of each Cepheid to calculate the observed mean magnitudes. These have to be corrected for interstellar extinction. The light traveling to us from M100 is not just passing through the vacuum of space, some of it ...
Hubble Space Telescope`s
... Peering into the crowded bulge of our Milky Way galaxy, Hubble looked farther than ever before to nab a group of planet candidates outside our solar system. Astronomers used Hubble to conduct a census of Jupiter-sized extrasolar planets residing in the bulge of our Milky Way galaxy. Looking at a nar ...
... Peering into the crowded bulge of our Milky Way galaxy, Hubble looked farther than ever before to nab a group of planet candidates outside our solar system. Astronomers used Hubble to conduct a census of Jupiter-sized extrasolar planets residing in the bulge of our Milky Way galaxy. Looking at a nar ...
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.