The Island Universe of Immanuel Kant - EU-HOU
... much farther galaxies could be measured. As can be easily noticed in the previous slide (right panel), Hubble law works very well: velocity/distance ratio remains constant in a wide range of these two quantities, particularly for more distant galaxies where the proper motions velocities become negli ...
... much farther galaxies could be measured. As can be easily noticed in the previous slide (right panel), Hubble law works very well: velocity/distance ratio remains constant in a wide range of these two quantities, particularly for more distant galaxies where the proper motions velocities become negli ...
ph607-14-a3uni - University of Kent
... Demonstrate that two images will be formed when the light from a source at distance dS passes a gravitational lens of mass M at a distance dL from the observer, with the angles subtended with the lens by the two images, 1 and 2, given by ...
... Demonstrate that two images will be formed when the light from a source at distance dS passes a gravitational lens of mass M at a distance dL from the observer, with the angles subtended with the lens by the two images, 1 and 2, given by ...
The Milky Way, Schroedinger`s Cat, and You
... The Hubble Space Telescope is in orbit above the Earth’s atmosphere and so is able to take sharp pictures……but….. ….. it is prohibitively expensive to build telescopes that are based in space A new method called “Adaptive Optics” allows us to sharpen the vision of telescopes that are on the ground, ...
... The Hubble Space Telescope is in orbit above the Earth’s atmosphere and so is able to take sharp pictures……but….. ….. it is prohibitively expensive to build telescopes that are based in space A new method called “Adaptive Optics” allows us to sharpen the vision of telescopes that are on the ground, ...
PX269 Galaxies The University of Warwick
... remnant with a semi-major axis of 0.83 arcsec and a semi-minor axis of 0.62 arcsec. The ring brightened asymmetrically over a period of 340 days. Use this information to determine the distance to the Large Magellanic Cloud (LMC). c) What is the advantage of this method over other methods for determi ...
... remnant with a semi-major axis of 0.83 arcsec and a semi-minor axis of 0.62 arcsec. The ring brightened asymmetrically over a period of 340 days. Use this information to determine the distance to the Large Magellanic Cloud (LMC). c) What is the advantage of this method over other methods for determi ...
ppt
... No!! Solid arguments from cosmology limit the amount of “normal” matter to less than that needed for dark matter halos. So, this is something new… non-baryonic matter. I.e., matter not based on protons and neutrons. 80-90% of matter in universe is non-baryonic dark matter!! ...
... No!! Solid arguments from cosmology limit the amount of “normal” matter to less than that needed for dark matter halos. So, this is something new… non-baryonic matter. I.e., matter not based on protons and neutrons. 80-90% of matter in universe is non-baryonic dark matter!! ...
BBO
... Optical Follow-ups Recall that BBO gives DL and a small error box on sky. Optical astronomers must still provide 300,000 redshifts. Is this realistic? • By the time BBO flies, the LSST could have determined photometric redshifts (accurate to 2-3%) for a large fraction of galaxies over 1/3 of the ...
... Optical Follow-ups Recall that BBO gives DL and a small error box on sky. Optical astronomers must still provide 300,000 redshifts. Is this realistic? • By the time BBO flies, the LSST could have determined photometric redshifts (accurate to 2-3%) for a large fraction of galaxies over 1/3 of the ...
Dark Matter: Inquiring Minds Want to Know ()
... What is Matter? • Lots of ways to understand the word “matter” • Examples: – Rocks – You – The Earth – The Sun – Atoms • Our Sun and Earth are attracted to each other by gravity • They are attracted to each other because they are made of “matter” – They have “mass” ...
... What is Matter? • Lots of ways to understand the word “matter” • Examples: – Rocks – You – The Earth – The Sun – Atoms • Our Sun and Earth are attracted to each other by gravity • They are attracted to each other because they are made of “matter” – They have “mass” ...
SUMMARY OF KEY CONCEPTS: GALAXIES AND COSMOLOGY
... This analysis is easiest to apply to spiral galaxies, which have a well-organized rotation of the stars and gas about the center. In most cases, the resulting rotation curve (velocity as a function of radius) is found to be flat at large radius. This is an important observation. It implies that ther ...
... This analysis is easiest to apply to spiral galaxies, which have a well-organized rotation of the stars and gas about the center. In most cases, the resulting rotation curve (velocity as a function of radius) is found to be flat at large radius. This is an important observation. It implies that ther ...
poster_IAU244 - ANU - Australian National University
... The neutral gas density of the universe as a function of redshift (on the above left) and look-back time (on the above right). The small, black triangle at z = 0 is the HIPASS 21cm emission measurement from Zwaan et al. 2005, MNRAS, 359, L30. The blue, open circles are damped Lyα measurements made u ...
... The neutral gas density of the universe as a function of redshift (on the above left) and look-back time (on the above right). The small, black triangle at z = 0 is the HIPASS 21cm emission measurement from Zwaan et al. 2005, MNRAS, 359, L30. The blue, open circles are damped Lyα measurements made u ...
Weak gravitational lensing
While the presence of any mass bends the path of light passing near it, this effect rarely produces the giant arcs and multiple images associated with strong gravitational lensing. Most lines of sight in the universe are thoroughly in the weak lensing regime, in which the deflection is impossible to detect in a single background source. However, even in these cases, the presence of the foreground mass can be detected, by way of a systematic alignment of background sources around the lensing mass. Weak gravitational lensing is thus an intrinsically statistical measurement, but it provides a way to measure the masses of astronomical objects without requiring assumptions about their composition or dynamical state.