EXERCISES: Set 4 of 4 Q1: (You will need a ruler and a calculator
... (b) Measure the equivalent widths of lines (1) and (2). Why is it not possible to measure the equivalent width of line (3) accurately? (c) Assuming that lines (1) and (2) are Lyα lines, deduce the corresponding column densities of neutral hydrogen, N (H i), if it is possible to do so. If it is not p ...
... (b) Measure the equivalent widths of lines (1) and (2). Why is it not possible to measure the equivalent width of line (3) accurately? (c) Assuming that lines (1) and (2) are Lyα lines, deduce the corresponding column densities of neutral hydrogen, N (H i), if it is possible to do so. If it is not p ...
The Milky Way Galaxy
... They have ages up to 10 to 13 billions years. Also, the oldest white dwarfs in the plane are now sort of orange in color. We can estimate that they may be 9 to 10 billion years old. This is how we can get an estimate of the age of the Galaxy. ...
... They have ages up to 10 to 13 billions years. Also, the oldest white dwarfs in the plane are now sort of orange in color. We can estimate that they may be 9 to 10 billion years old. This is how we can get an estimate of the age of the Galaxy. ...
in the milky way - Chandra X
... chandra explores “ downtown” in the milky way The word galaxy comes from the Greek word meaning “milky circle” or, more familiarly, “milky way.” The white band of light across the night sky that we call the Milky Way was poetically described long before Galileo. But with his small telescope, what he ...
... chandra explores “ downtown” in the milky way The word galaxy comes from the Greek word meaning “milky circle” or, more familiarly, “milky way.” The white band of light across the night sky that we call the Milky Way was poetically described long before Galileo. But with his small telescope, what he ...
Handout 3 1-2 ppt
... Fifty thousand years ago, a giant fireball streaked across the North American sky. It struck the earth in what is now northern Arizona, exploding with the force of 2 ½ million tons of TNT. ...
... Fifty thousand years ago, a giant fireball streaked across the North American sky. It struck the earth in what is now northern Arizona, exploding with the force of 2 ½ million tons of TNT. ...
Lecture 22 - Star Formation from Molecular Clouds
... • We understand the physics of these processes (at least partially) • We believe the Sun formed like this. • What characteristic of the solar system can we see that is an indicator of the processes of contraction, jet formation, accretion disk formation, etc? ...
... • We understand the physics of these processes (at least partially) • We believe the Sun formed like this. • What characteristic of the solar system can we see that is an indicator of the processes of contraction, jet formation, accretion disk formation, etc? ...
Groups of Stars
... MOVING TOWARDS THE MILKY WAY, THEY WILL EVENTUALLY COLLIDE!!! This event will occur in about 5 billion years…) ...
... MOVING TOWARDS THE MILKY WAY, THEY WILL EVENTUALLY COLLIDE!!! This event will occur in about 5 billion years…) ...
The Spiral Structure of the Milky Way
... Way’s spiral structure than optical observations allow. Uncertainties involved in interpreting the neutral hydrogen flux density profiles. It can be concluded that 21 cm hydrogen observations do indeed indicate spiral structure on a large scale in the Galactic plane. ...
... Way’s spiral structure than optical observations allow. Uncertainties involved in interpreting the neutral hydrogen flux density profiles. It can be concluded that 21 cm hydrogen observations do indeed indicate spiral structure on a large scale in the Galactic plane. ...
PowerPoint - Chandra X
... NGC 1068: An active galaxy about 50 million light years from Earth. Chandra X-ray Observatory ACIS/HETGS image. ...
... NGC 1068: An active galaxy about 50 million light years from Earth. Chandra X-ray Observatory ACIS/HETGS image. ...
Solving the Mystery of Massive Star Birth
... As the cloud gets smaller, it gets clumpy. The clumps may eventually become so compact that they begin to heat up, growing hotter and hotter, until eventually they begin “burning” at their core. When the temperature at the core reaches a scorching 10 million degrees, the clump officially becomes a new ...
... As the cloud gets smaller, it gets clumpy. The clumps may eventually become so compact that they begin to heat up, growing hotter and hotter, until eventually they begin “burning” at their core. When the temperature at the core reaches a scorching 10 million degrees, the clump officially becomes a new ...
Document
... • By 1929, the expansion of the Universe was known, clearly separating galaxies from Galactic nebulae. • Note: it was known that Galactic nebulae had emisson spectra and galaxies had continous (stellar) spectra, but no one figured it out. ...
... • By 1929, the expansion of the Universe was known, clearly separating galaxies from Galactic nebulae. • Note: it was known that Galactic nebulae had emisson spectra and galaxies had continous (stellar) spectra, but no one figured it out. ...
Dynamical Properties of Infrared Dark Clouds
... (mid-IR) wavelengths. Studies thus far have shown these IRDCs to be dense (>105 cm-3), cold (<25 K), and to have very high column densities (>10231025 cm-2; e.g., Egan et al. 1998; Carey et al. 1998, 2000). The characteristic high column densities and low temperatures of IRDCs suggest that they host ...
... (mid-IR) wavelengths. Studies thus far have shown these IRDCs to be dense (>105 cm-3), cold (<25 K), and to have very high column densities (>10231025 cm-2; e.g., Egan et al. 1998; Carey et al. 1998, 2000). The characteristic high column densities and low temperatures of IRDCs suggest that they host ...
Chapter 23 The Milky Way Galaxy
... The galactic halo and globular clusters formed very early; the halo is essentially spherical. All the stars in the halo are very old, and there is no gas and dust. The galactic disk is where the youngest stars are, as well as star formation regions— emission nebulae and large clouds of gas and ...
... The galactic halo and globular clusters formed very early; the halo is essentially spherical. All the stars in the halo are very old, and there is no gas and dust. The galactic disk is where the youngest stars are, as well as star formation regions— emission nebulae and large clouds of gas and ...
Stellar Astronomy Unit 3 Key Terms and Matching Definitions _____
... 10. The collection of approximately 40 galaxies that includes the Milky Way Galaxy. 11. When two similarly-sized galaxies collide and merge together into one larger galaxy. 12. When a small galaxy collides with a large galaxy and is “swallowed up” by the larger one. 13. When spectral lines move to l ...
... 10. The collection of approximately 40 galaxies that includes the Milky Way Galaxy. 11. When two similarly-sized galaxies collide and merge together into one larger galaxy. 12. When a small galaxy collides with a large galaxy and is “swallowed up” by the larger one. 13. When spectral lines move to l ...
Integrative Studies 410 Our Place in the Universe
... Where Stars come from: the Interstellar Medium • Gas – Single atoms and molecules – Mostly hydrogen (90%), 9% helium; deficient in heavier elements ...
... Where Stars come from: the Interstellar Medium • Gas – Single atoms and molecules – Mostly hydrogen (90%), 9% helium; deficient in heavier elements ...
DM in the Galaxy - University of Oxford
... Local disk density • Near Sun vrand! • ½(R0,0) = 0.1§0.01 M¯ pc-3 ...
... Local disk density • Near Sun vrand! • ½(R0,0) = 0.1§0.01 M¯ pc-3 ...
Chemical Evolution of the Galaxy and its satellites
... proposed a model where the Bulge forms very quickly from gas shed by the halo • The star formation efficiency was quite high (starburst) and the IMF flatter than in the disk • In this situation a long plateau for [alpha/Fe] ratios is predicted ...
... proposed a model where the Bulge forms very quickly from gas shed by the halo • The star formation efficiency was quite high (starburst) and the IMF flatter than in the disk • In this situation a long plateau for [alpha/Fe] ratios is predicted ...
Ch. 13 GALAXIES
... galaxies undergoing aggressive star formation due to interactions Ex/ M82 – The ______ Galaxy B. ____________ galaxies – resemble spirals, but with very energetic galactic _________ Ex/ NGC 7742 “Fried Egg” C. ______ galaxies – gigantic radio ______ on each side of the galaxy. Ex/ _________ D. _____ ...
... galaxies undergoing aggressive star formation due to interactions Ex/ M82 – The ______ Galaxy B. ____________ galaxies – resemble spirals, but with very energetic galactic _________ Ex/ NGC 7742 “Fried Egg” C. ______ galaxies – gigantic radio ______ on each side of the galaxy. Ex/ _________ D. _____ ...
WK9Winter2004
... United States launched the first space probe it kept going off course. Well, it took them awhile to re-analyze all the evidence and what they came up with is that gravity does not exist in space. This is how I was able to detect what has since been called the "Quasars" or" QuasiStellar Sources". ...
... United States launched the first space probe it kept going off course. Well, it took them awhile to re-analyze all the evidence and what they came up with is that gravity does not exist in space. This is how I was able to detect what has since been called the "Quasars" or" QuasiStellar Sources". ...
Lecture 26
... much like normal spiral galaxies with one exception • They often have a very bright unresolved nucleus, far brighter than the nucleus of a normal galaxy ...
... much like normal spiral galaxies with one exception • They often have a very bright unresolved nucleus, far brighter than the nucleus of a normal galaxy ...
20140319_J.Gan
... almost entirely destroyed by harassment. The disks lose very substantial amounts of mass. The bound stars are also heated, which transforms the disk into spheroidal component. Dwarf ellipticals are ubiquitous in clusters. For more compact early-type (Sa-Sb) disk galaxies, they can be significant ...
... almost entirely destroyed by harassment. The disks lose very substantial amounts of mass. The bound stars are also heated, which transforms the disk into spheroidal component. Dwarf ellipticals are ubiquitous in clusters. For more compact early-type (Sa-Sb) disk galaxies, they can be significant ...
Article PDF - IOPscience
... less clear since only four data points are available. Their values are well covered by the disk region evolution. Assuming that the absorbing gas in the line of sight to the damped Lya systems may belong to both halo and disk components, we can evaluate its corresponding theoretical abundance by ave ...
... less clear since only four data points are available. Their values are well covered by the disk region evolution. Assuming that the absorbing gas in the line of sight to the damped Lya systems may belong to both halo and disk components, we can evaluate its corresponding theoretical abundance by ave ...
mam.mwism
... stars as the disk, and very little gas and dust. We can’t detect halos of other galaxies. Nuclear bulge has radius of 2 kpc and contains little gas and dust. ...
... stars as the disk, and very little gas and dust. We can’t detect halos of other galaxies. Nuclear bulge has radius of 2 kpc and contains little gas and dust. ...
Chapter 7 Vocabulary212
... 1. Spectroscope- used to study star’s characteristics by spreading light into different wavelengths 2. Nuclear fusion- nuclei of several atoms combine to form on large nucleus 3. astronomical unit- average distance between Earth and Sun (150 million km) 4. light year- distance light travels in 1 yea ...
... 1. Spectroscope- used to study star’s characteristics by spreading light into different wavelengths 2. Nuclear fusion- nuclei of several atoms combine to form on large nucleus 3. astronomical unit- average distance between Earth and Sun (150 million km) 4. light year- distance light travels in 1 yea ...
Astronomy I Ex.2
... What is the (approximate) age of the universe in Gyr? 3. Convert the following distances in cm to distances in AU: a) Approximate distance from the earth to the sun: 1.44 × 1013 cm b) Approximate distance from the earth to the next nearest star - Alpha Centauri: 3.97 × 1018 cm c) Approximate distanc ...
... What is the (approximate) age of the universe in Gyr? 3. Convert the following distances in cm to distances in AU: a) Approximate distance from the earth to the sun: 1.44 × 1013 cm b) Approximate distance from the earth to the next nearest star - Alpha Centauri: 3.97 × 1018 cm c) Approximate distanc ...
The Milky Way II AST 112
... slowing, merging with ISM • “Superbubbles” happen when cluster stars die at the same time – Can grow to thousands of LY ...
... slowing, merging with ISM • “Superbubbles” happen when cluster stars die at the same time – Can grow to thousands of LY ...