Lecture-25 Notes - Georgia Southern University Astrophysics
... but are most definitely not stars - they are distant galaxies whose nuclei are emitting much more light than the rest of the host galaxy. Here are some examples. Compare their nuclei with the image of a star (to the same scale) at far upper-left. QSOs are some of the most luminous objects in the Uni ...
... but are most definitely not stars - they are distant galaxies whose nuclei are emitting much more light than the rest of the host galaxy. Here are some examples. Compare their nuclei with the image of a star (to the same scale) at far upper-left. QSOs are some of the most luminous objects in the Uni ...
Seeding the Universe with Life
... extending them with synthetic components that are optimized for new functions. This modified biology may adapt better better adapted to new space environments. They may be cellular gene/protein life made of organic molecules, cells and organs, but having a different chemistry than ours. We may also ...
... extending them with synthetic components that are optimized for new functions. This modified biology may adapt better better adapted to new space environments. They may be cellular gene/protein life made of organic molecules, cells and organs, but having a different chemistry than ours. We may also ...
Understanding the Astrophysics of Galaxy Evolution: the role of
... and showed that LBGs had moderate mass (109 −1010 M⊙ ) and metallicity (0.3 solar), that they were forming stars very rapidly, and that supernovae were driving significant outflows. Since then, the race to claim the record for the highest redshift object has absorbed many in the field. Today, this r ...
... and showed that LBGs had moderate mass (109 −1010 M⊙ ) and metallicity (0.3 solar), that they were forming stars very rapidly, and that supernovae were driving significant outflows. Since then, the race to claim the record for the highest redshift object has absorbed many in the field. Today, this r ...
... attract each other into a larger structure called a supercluster – a cluster of clusters – A supercluster contains a half dozen to several dozen galaxy clusters spread over tens to hundreds of millions of light-years (The Local group belongs to the Local Supercluster) – Superclusters have irregular ...
Building` a Galaxy SED
... Measure flux (energy/time/area) in the frequency range Often expressed as (AB)-magnitude: ...
... Measure flux (energy/time/area) in the frequency range Often expressed as (AB)-magnitude: ...
File - Mr. Catt`s Class
... 7. Type c spirals contain more gas and dust than type a, resulting in a larger proportion of their mass being involved in star formation. Courtesy of Todd Boroson/NOAO/AURA/NSF ...
... 7. Type c spirals contain more gas and dust than type a, resulting in a larger proportion of their mass being involved in star formation. Courtesy of Todd Boroson/NOAO/AURA/NSF ...
Carl Sagan - Cosmos (1980) [Full Color Illustrated
... omy but with a very broad human perspective. It was to be aimed at popular audiences, to be visually and musically stun ning, and to engage the heart as well as the mind. We talked with underwriters, hired an executive producer, and found ourselves embarked on a three-year project called Cosmos. At ...
... omy but with a very broad human perspective. It was to be aimed at popular audiences, to be visually and musically stun ning, and to engage the heart as well as the mind. We talked with underwriters, hired an executive producer, and found ourselves embarked on a three-year project called Cosmos. At ...
1 Introduction - Wiley-VCH
... powerful distance tracers generally used to study the large scale galaxy distribution within the universe. Clearly, a coherent and complete understanding of galaxy evolution through cosmic time requires a simultaneous analysis of all the different galaxy components. This can be achieved only through ...
... powerful distance tracers generally used to study the large scale galaxy distribution within the universe. Clearly, a coherent and complete understanding of galaxy evolution through cosmic time requires a simultaneous analysis of all the different galaxy components. This can be achieved only through ...
File - xaviantvision
... volcanic eminences that dwarf the highest mountain on Earth; ancient river valleys on two planets enigmatically one too cold and the other too hot for running water; a giant planet with an interior of liquid metallic hydrogen into which a thousand Earths would fit; whole moons that have melted; a cl ...
... volcanic eminences that dwarf the highest mountain on Earth; ancient river valleys on two planets enigmatically one too cold and the other too hot for running water; a giant planet with an interior of liquid metallic hydrogen into which a thousand Earths would fit; whole moons that have melted; a cl ...
Galaxies - University of Iowa Astrophysics
... B) Their luminosity can be determined from their pulsation period. C) They all have the same luminosity. D) They all have the same radius. ...
... B) Their luminosity can be determined from their pulsation period. C) They all have the same luminosity. D) They all have the same radius. ...
The evolution of organic matter in space
... mass leading to carbon and heavier elements, and up to 56 Fe for the more massive stars. Heavier elements than iron are formed during the final stages of stars in stellar explosions by neutron absorption (s and r processes). In this phase, no equilibrium can be reached: the stars undergo mass loss ei ...
... mass leading to carbon and heavier elements, and up to 56 Fe for the more massive stars. Heavier elements than iron are formed during the final stages of stars in stellar explosions by neutron absorption (s and r processes). In this phase, no equilibrium can be reached: the stars undergo mass loss ei ...
PPT
... What have we learned? • How do we measure the distances to galaxies? – The distance-measurement chain begins with parallax measurements that build on radar ranging in our solar system – Using parallax and the relationship between luminosity, distance, and brightness, we can calibrate a series of st ...
... What have we learned? • How do we measure the distances to galaxies? – The distance-measurement chain begins with parallax measurements that build on radar ranging in our solar system – Using parallax and the relationship between luminosity, distance, and brightness, we can calibrate a series of st ...
Ch17_Galaxies
... simulations show bar may be result of a close encounter between two galaxies • The Milky Way is probably an SB galaxy ...
... simulations show bar may be result of a close encounter between two galaxies • The Milky Way is probably an SB galaxy ...
Introduction to Galaxies - West Jefferson Local Schools
... Recall, luminosity of stars scales with mass of stars… therefore, luminosity of galaxy scales with number of stars (and thus, mass of stars). Thus, luminosity of galaxy gives mass of galaxy. Going backwards… measure the velocity to “weigh” the galaxy to obtain luminosity. ...
... Recall, luminosity of stars scales with mass of stars… therefore, luminosity of galaxy scales with number of stars (and thus, mass of stars). Thus, luminosity of galaxy gives mass of galaxy. Going backwards… measure the velocity to “weigh” the galaxy to obtain luminosity. ...
Lecture 16
... First identified as bright radio sources - without visible counterparts In 1962 Maarten Schmidt identified a “star” coincident with the radio source and obtained a spectrum. He discovered it was not a star, and named it a QUASAR. ...
... First identified as bright radio sources - without visible counterparts In 1962 Maarten Schmidt identified a “star” coincident with the radio source and obtained a spectrum. He discovered it was not a star, and named it a QUASAR. ...
Observational Data
... star formation rate (>100Mo/yr), irregular and possibly merging-like morphologies, large masses, and strong redshift clustering, suggesting that they are massive early-type galaxies in the act of major assembly episodes. ...
... star formation rate (>100Mo/yr), irregular and possibly merging-like morphologies, large masses, and strong redshift clustering, suggesting that they are massive early-type galaxies in the act of major assembly episodes. ...
PPT - ALFALFA survey
... Schneider (2000). It was a drift-scan survey taken in a series of declination strips with the Arecibo 305-m telescope. The velocity limit of the ADBS is 8000 km/s (it is volume limited!). The full ADBS sample includes 265 galaxies over ~420 sq. deg. • Since it is a “blind” HI survey, it does not suf ...
... Schneider (2000). It was a drift-scan survey taken in a series of declination strips with the Arecibo 305-m telescope. The velocity limit of the ADBS is 8000 km/s (it is volume limited!). The full ADBS sample includes 265 galaxies over ~420 sq. deg. • Since it is a “blind” HI survey, it does not suf ...
presentation (PPT format)
... have their own motions relative to one another thanks to their mutual gravitational attraction-for distant galaxies the Hubble speed is much greater than any intrinsic motions that the galaxies might have • The value of H0? Depends on the determination of the distance (vary depending on the techniqu ...
... have their own motions relative to one another thanks to their mutual gravitational attraction-for distant galaxies the Hubble speed is much greater than any intrinsic motions that the galaxies might have • The value of H0? Depends on the determination of the distance (vary depending on the techniqu ...
Intelligent Life in the Universe - e
... Recent advances in search techniques for planets, in the theory of planet formation, and particularly in biochemistry, molecular, and cell biology are about to give answers to these questions: how life appeared and how many planets can be expected in the universe on which life, and eventually intell ...
... Recent advances in search techniques for planets, in the theory of planet formation, and particularly in biochemistry, molecular, and cell biology are about to give answers to these questions: how life appeared and how many planets can be expected in the universe on which life, and eventually intell ...
The astrobiological case for our cosmic ancestry
... referred to as an ‘ extraordinary hypothesis ’, and it is contended that extraordinary hypotheses need extraordinary evidence to defend them. However, the cosmic nature of life is by no means ‘extraordinary ’: it is extraordinary only in the context of Earth-centred cosmologies that should have beco ...
... referred to as an ‘ extraordinary hypothesis ’, and it is contended that extraordinary hypotheses need extraordinary evidence to defend them. However, the cosmic nature of life is by no means ‘extraordinary ’: it is extraordinary only in the context of Earth-centred cosmologies that should have beco ...
8-4.9 - S2TEM Centers SC
... Some incorrect believes children often hold include but are not limited to: The planets are relatively similar in size to the Sun and are relatively close in distance to one another. (The diameters of the planets are vastly different. The distances between the last five planets are much greater th ...
... Some incorrect believes children often hold include but are not limited to: The planets are relatively similar in size to the Sun and are relatively close in distance to one another. (The diameters of the planets are vastly different. The distances between the last five planets are much greater th ...
The Big Bang
... • distance to the closest star is about 3 light years, so when we look at this star we see it as it looked 3 years ago • distance to our “sister galaxy” (M31) is about 2.6 million light years, so when we look at this galaxy we see it as it looked 2.6 million years ago • distance to the farthest know ...
... • distance to the closest star is about 3 light years, so when we look at this star we see it as it looked 3 years ago • distance to our “sister galaxy” (M31) is about 2.6 million light years, so when we look at this galaxy we see it as it looked 2.6 million years ago • distance to the farthest know ...
Galaxy Notes File
... “rotation curves” following the “expected” path in the diagram at right. Rotation curves tend to remain high as far out as they can be measured. ...
... “rotation curves” following the “expected” path in the diagram at right. Rotation curves tend to remain high as far out as they can be measured. ...
The Classification of Galaxies By Daniel Underwood Contents The
... accepted by astronomers that there were other galaxies than our own in the cosmos. However, it wasn’t immediately recognised that these nebulae were actually galaxies like our own, it took time to realise that they weren’t gaseous, but actually massive collections of stars. These masses outside the ...
... accepted by astronomers that there were other galaxies than our own in the cosmos. However, it wasn’t immediately recognised that these nebulae were actually galaxies like our own, it took time to realise that they weren’t gaseous, but actually massive collections of stars. These masses outside the ...
File 11 - School of Astronomy, IPM
... • Half of all disk galaxies - Milky Way included - show a central bar which contains up to 1/3 of the total light Bars are a form of dynamical instability in differentially rotating stellar disks • S0 galaxies also have bars – a bar can persist in the absence of gas • Bar patterns are not static, th ...
... • Half of all disk galaxies - Milky Way included - show a central bar which contains up to 1/3 of the total light Bars are a form of dynamical instability in differentially rotating stellar disks • S0 galaxies also have bars – a bar can persist in the absence of gas • Bar patterns are not static, th ...
Fermi paradox
The Fermi paradox (or Fermi's paradox) is the apparent contradiction between high estimates of the probability of the existence of extraterrestrial civilizations, such as in the Drake equation, and the lack of evidence for such civilizations. The basic points of the argument, made by physicists Enrico Fermi and Michael H. Hart, are: The Sun is a typical star, and there are billions of stars in the galaxy that are billions of years older. With high probability, some of these stars will have Earth-like planets, and if the earth is typical, some might develop intelligent life. Some of these civilizations might develop interstellar travel, a step the Earth is investigating now. Even at the slow pace of currently envisioned interstellar travel, the Milky Way galaxy could be completely traversed in about a million years.According to this line of thinking, the Earth should already have been visited by extraterrestrial aliens though Fermi saw no convincing evidence of this, nor any signs of alien intelligence anywhere in the observable universe, leading him to ask, ""Where is everybody?""