Lecture Topics 1023
... ASTR 1023 Lecture Topics These are the headings of the paragraphs into which ASTR 1023 lectures are divided. Use them to check your notes for completeness, and to see how the course is organized. It is also a good idea to cross-check these topics with your reading assignments, because some topics ar ...
... ASTR 1023 Lecture Topics These are the headings of the paragraphs into which ASTR 1023 lectures are divided. Use them to check your notes for completeness, and to see how the course is organized. It is also a good idea to cross-check these topics with your reading assignments, because some topics ar ...
Sample pages 1 PDF
... astronomy that is in a phase of major development; there has also been huge progress in instrumentation in other wavebands, allowing us a multi-wavelength view of the Universe (Fig. 1.3). Space-based observing platforms are playing a crucial role in this. We will consider this topic in Sect. 1.3. Th ...
... astronomy that is in a phase of major development; there has also been huge progress in instrumentation in other wavebands, allowing us a multi-wavelength view of the Universe (Fig. 1.3). Space-based observing platforms are playing a crucial role in this. We will consider this topic in Sect. 1.3. Th ...
A6 - Vicphysics
... For this point it is useful to provide example maps of a region of the night sky for a specific time in two versions; one with an altitude-azimuth coordinate system (alt-az), the other using the right ascension-declination system. Students can determine the location of one or more identified stars u ...
... For this point it is useful to provide example maps of a region of the night sky for a specific time in two versions; one with an altitude-azimuth coordinate system (alt-az), the other using the right ascension-declination system. Students can determine the location of one or more identified stars u ...
Are Gamma-Ray Bursts good Star Formation Indicators?
... preference for low metallicity environments. For example, Ramirez-Ruiz et al. (2002 ApJ 565 L9) found that GRBs located in the outer parts of their host galaxies, presumably with lower metallicity, are somewhat brighter then those closer to the centres. Fynbo et al. (2003 A&A 406 L63) pointed out th ...
... preference for low metallicity environments. For example, Ramirez-Ruiz et al. (2002 ApJ 565 L9) found that GRBs located in the outer parts of their host galaxies, presumably with lower metallicity, are somewhat brighter then those closer to the centres. Fynbo et al. (2003 A&A 406 L63) pointed out th ...
talk
... ► comparable to other galaxies with less extended HI disk No evidence for baryon loss (measured within the extent of gas disk) in faint dwarf galaxies (contradiction to simulations of galaxy formation !) To reconcile rotation curve data with theoretical models require baryons in dwarfs to occupy ...
... ► comparable to other galaxies with less extended HI disk No evidence for baryon loss (measured within the extent of gas disk) in faint dwarf galaxies (contradiction to simulations of galaxy formation !) To reconcile rotation curve data with theoretical models require baryons in dwarfs to occupy ...
Using time to measure distance - AS-A2
... 11. In the 1920s. Vesto Slipher and Edwin Hubble gathered data that showed that distant galaxies are all moving away from us and that the speed at which they are moving away is directly proportional to their distance. How do cosmologists account for these observations? ...
... 11. In the 1920s. Vesto Slipher and Edwin Hubble gathered data that showed that distant galaxies are all moving away from us and that the speed at which they are moving away is directly proportional to their distance. How do cosmologists account for these observations? ...
Chapter 19 Stars Galaxies and the Universe
... The rotation of Earth causes daytime and nighttime. Because of Earth’s rotation, the sun moves across the sky during the daytime. For this same reason, the stars seem to move across the sky at night. All of the stars that you see appear to rotate around Polaris, the North Star. The stars seem to mak ...
... The rotation of Earth causes daytime and nighttime. Because of Earth’s rotation, the sun moves across the sky during the daytime. For this same reason, the stars seem to move across the sky at night. All of the stars that you see appear to rotate around Polaris, the North Star. The stars seem to mak ...
The Strikingly Uniform, Highly Turbulent Interstellar Medium of the
... awarded 8.1h in bands 7 and 8 to study the red-shifted 157.7µm (2 P3/2 → 2 P1/2 ) fine-structure transition of ionized carbon, [C ii], and the underlying dust continuum emission in a sample of Hot DOGs spanning a range of redshifts and luminosities. Observations of W2246-0526, the first galaxy of th ...
... awarded 8.1h in bands 7 and 8 to study the red-shifted 157.7µm (2 P3/2 → 2 P1/2 ) fine-structure transition of ionized carbon, [C ii], and the underlying dust continuum emission in a sample of Hot DOGs spanning a range of redshifts and luminosities. Observations of W2246-0526, the first galaxy of th ...
Calculate the Mass of the Milky Way Galaxy
... Few of the points fall exactly on the line. This is because all galaxies have some additional residual motion in addition to the pure expansion. This is referred to as the "cosmic velocity dispersion" or "cosmic scatter" and is probably due to the fact that the gas clouds that formed the galaxies al ...
... Few of the points fall exactly on the line. This is because all galaxies have some additional residual motion in addition to the pure expansion. This is referred to as the "cosmic velocity dispersion" or "cosmic scatter" and is probably due to the fact that the gas clouds that formed the galaxies al ...
Lecture21 - Michigan State University
... atomic hydrogen is confined to an extremely flat layer that is about 400 LY thick • In the plane of the Galaxy, this cold hydrogen extends out 80,000 LY from the center • Dust is also confined to the plane of the Galaxy being about the same thickness as the hydrogen gas but more concentrated in the ...
... atomic hydrogen is confined to an extremely flat layer that is about 400 LY thick • In the plane of the Galaxy, this cold hydrogen extends out 80,000 LY from the center • Dust is also confined to the plane of the Galaxy being about the same thickness as the hydrogen gas but more concentrated in the ...
A100H–Exploring the Universe: Dark Matter, Dark Energy Martin D
... Either dark matter exists or our understanding of our gravity must be revised ...
... Either dark matter exists or our understanding of our gravity must be revised ...
Facilitator`s Guide
... The process of “measuring” the stars and the distance to them is a combination of direct measurement, inference and indirect measurement. All direct measurements of stars, and the only measurements that can be made, involve the detection of the energy they emit (typically the visible light energy) t ...
... The process of “measuring” the stars and the distance to them is a combination of direct measurement, inference and indirect measurement. All direct measurements of stars, and the only measurements that can be made, involve the detection of the energy they emit (typically the visible light energy) t ...
Gamma-Ray Bursts: The Brightest Explosions in the Universe Arne
... (Introduction to the The ultra-luminous Universe: Gamma-Ray Bursts and Active Galactic Nuclei Session) ...
... (Introduction to the The ultra-luminous Universe: Gamma-Ray Bursts and Active Galactic Nuclei Session) ...
Formation of z~6 Quasars from Hierarchical Galaxy Mergers
... ¥ Quasar host galaxy build rapidly through gas rich mergers. ¥ SFR up to 104 Msun /year ¥ Reaching stellar mass of 1012Msun at Z~6.5 ¥ BH accretion reaches 20 Msun/year and M = ...
... ¥ Quasar host galaxy build rapidly through gas rich mergers. ¥ SFR up to 104 Msun /year ¥ Reaching stellar mass of 1012Msun at Z~6.5 ¥ BH accretion reaches 20 Msun/year and M = ...
Characteristics of Our Galaxy
... Our home, the planet Earth, orbits the Sun along with Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. The Sun, the eight major planets, Pluto, and various small bodies such as dwarf planets, moons, comets, and asteroids locked into gravitational orbits with the Sun and planets com ...
... Our home, the planet Earth, orbits the Sun along with Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. The Sun, the eight major planets, Pluto, and various small bodies such as dwarf planets, moons, comets, and asteroids locked into gravitational orbits with the Sun and planets com ...
The Star-Galaxy Era of Big History in the Light of Universal
... the Universe. In addition, there is no consensus on which galaxies should be regarded as old, and which galaxies should be considered young. The point is that within a single galaxy one can find stars and their aggregates that considerably differ in their type, age, and other parameters. For example ...
... the Universe. In addition, there is no consensus on which galaxies should be regarded as old, and which galaxies should be considered young. The point is that within a single galaxy one can find stars and their aggregates that considerably differ in their type, age, and other parameters. For example ...
Journey through the cosmos
... This publication is copyright New South Wales Department of Education and Training (DET), however it may contain material from other sources which is not owned by DET. We would like to acknowledge the following people and organisations whose material has been used: Photograph of spiral galaxy courte ...
... This publication is copyright New South Wales Department of Education and Training (DET), however it may contain material from other sources which is not owned by DET. We would like to acknowledge the following people and organisations whose material has been used: Photograph of spiral galaxy courte ...
Wandering in the Redshift Desert
... and does so with VIMOS for objects down to B magnitudes ~ 25 with 5-hour integrations. The success rate of zCOSMOS-Deep (i.e., the fraction of targets for which a reliable redshift is obtained) is ...
... and does so with VIMOS for objects down to B magnitudes ~ 25 with 5-hour integrations. The success rate of zCOSMOS-Deep (i.e., the fraction of targets for which a reliable redshift is obtained) is ...
The Extragalactic Group of MPE and USM
... • Advantage of photo z: no color selection bias, fainter luminosities, larger sample (~10000 galaxies in FDF and GOODS S sub-sample) • FORS Deep Field (IAB=26.8): 98% of all galaxies with dz/(1+z)<0.03; GOODS S (KAB=25.4): dz/(1+z)<0.055 • Deep I-selection misses only a small fraction of deep K sele ...
... • Advantage of photo z: no color selection bias, fainter luminosities, larger sample (~10000 galaxies in FDF and GOODS S sub-sample) • FORS Deep Field (IAB=26.8): 98% of all galaxies with dz/(1+z)<0.03; GOODS S (KAB=25.4): dz/(1+z)<0.055 • Deep I-selection misses only a small fraction of deep K sele ...
the first three thresholds - McGraw
... By the third century ce, as Christianity spread within the Roman Empire, a number of Christian theologians attempted to date the moment of creation. Their attempts were “scientific” insofar as they were based on evidence from the most authoritative written source they knew: the Bible. Using this sou ...
... By the third century ce, as Christianity spread within the Roman Empire, a number of Christian theologians attempted to date the moment of creation. Their attempts were “scientific” insofar as they were based on evidence from the most authoritative written source they knew: the Bible. Using this sou ...
CENTRAL TEXAS COLLEGE
... provide a sense of the mystery and majesty of the universe. As with our ancestors back beyond recorded time, we can’t help but wonder what kind of Universe is this? What are its fundamental laws? How old is it? How big? What does it contain? How has it changed with time, and what may be its future? ...
... provide a sense of the mystery and majesty of the universe. As with our ancestors back beyond recorded time, we can’t help but wonder what kind of Universe is this? What are its fundamental laws? How old is it? How big? What does it contain? How has it changed with time, and what may be its future? ...
Option D – Astrophysics
... The Sun and all the objects orbiting it are collectively known as the solar system. Our Sun is a star and it is very similar to billions of other stars in the universe. It has many objects orbiting around it that are held in their orbits by gravity. The solar system is an example of a planetary syst ...
... The Sun and all the objects orbiting it are collectively known as the solar system. Our Sun is a star and it is very similar to billions of other stars in the universe. It has many objects orbiting around it that are held in their orbits by gravity. The solar system is an example of a planetary syst ...
Part2
... (that’s okay, beam has large spatial area too). We’ve used 12CO as our example, scale to get other lines. ...
... (that’s okay, beam has large spatial area too). We’ve used 12CO as our example, scale to get other lines. ...
PH607lec12-5gal3
... fainter lines in this region due to [NII]. HII regions appear reddish in this image because of the prominence of the H alpha line in the red region of the spectrum. The dark features running vertically trace emission in the hydrogen H-alpha line (left and stronger feature, rest wavelength 6563 Angst ...
... fainter lines in this region due to [NII]. HII regions appear reddish in this image because of the prominence of the H alpha line in the red region of the spectrum. The dark features running vertically trace emission in the hydrogen H-alpha line (left and stronger feature, rest wavelength 6563 Angst ...
9 Dwarf Galaxies
... Stars outside this region find that the periodic pull of the spiral is faster than their epicyclic frequency, they don’t respond to the spiral and the wave dissipates. Resonance in narrow annulus can explain why 2 arm spirals are ...
... Stars outside this region find that the periodic pull of the spiral is faster than their epicyclic frequency, they don’t respond to the spiral and the wave dissipates. Resonance in narrow annulus can explain why 2 arm spirals are ...
Observable universe
The observable universe consists of the galaxies and other matter that can, in principle, be observed from Earth at the present time because light and other signals from these objects has had time to reach the Earth since the beginning of the cosmological expansion. Assuming the universe is isotropic, the distance to the edge of the observable universe is roughly the same in every direction. That is, the observable universe is a spherical volume (a ball) centered on the observer. Every location in the Universe has its own observable universe, which may or may not overlap with the one centered on Earth.The word observable used in this sense does not depend on whether modern technology actually permits detection of radiation from an object in this region (or indeed on whether there is any radiation to detect). It simply indicates that it is possible in principle for light or other signals from the object to reach an observer on Earth. In practice, we can see light only from as far back as the time of photon decoupling in the recombination epoch. That is when particles were first able to emit photons that were not quickly re-absorbed by other particles. Before then, the Universe was filled with a plasma that was opaque to photons.The surface of last scattering is the collection of points in space at the exact distance that photons from the time of photon decoupling just reach us today. These are the photons we detect today as cosmic microwave background radiation (CMBR). However, with future technology, it may be possible to observe the still older relic neutrino background, or even more distant events via gravitational waves (which also should move at the speed of light). Sometimes astrophysicists distinguish between the visible universe, which includes only signals emitted since recombination—and the observable universe, which includes signals since the beginning of the cosmological expansion (the Big Bang in traditional cosmology, the end of the inflationary epoch in modern cosmology). According to calculations, the comoving distance (current proper distance) to particles from the CMBR, which represent the radius of the visible universe, is about 14.0 billion parsecs (about 45.7 billion light years), while the comoving distance to the edge of the observable universe is about 14.3 billion parsecs (about 46.6 billion light years), about 2% larger.The best estimate of the age of the universe as of 2015 is 7010137990000000000♠13.799±0.021 billion years but due to the expansion of space humans are observing objects that were originally much closer but are now considerably farther away (as defined in terms of cosmological proper distance, which is equal to the comoving distance at the present time) than a static 13.8 billion light-years distance. It is estimated that the diameter of the observable universe is about 28 gigaparsecs (91 billion light-years, 8.8×1026 metres or 5.5×1023 miles), putting the edge of the observable universe at about 46–47 billion light-years away.