Introduction to Galaxies - West Jefferson Local Schools
... • orbits of stars and gas are “circular”, rotating about disk axis • star formation is on-going; it is can be fairly constant over the age of the galaxy • gas and dust mass fraction is roughly 10-50% of full disk • due on-going star formation, ages of stars widely range from age of galaxy to new • s ...
... • orbits of stars and gas are “circular”, rotating about disk axis • star formation is on-going; it is can be fairly constant over the age of the galaxy • gas and dust mass fraction is roughly 10-50% of full disk • due on-going star formation, ages of stars widely range from age of galaxy to new • s ...
The evolution of spiral galaxies in clusters Kutdemir, Elif
... Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. ...
... Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. ...
Investigating the Low-Mass Stellar Initial Mass Function in
... We need to hold one of these two parameters fixed and then fit for the other one and the BF. ...
... We need to hold one of these two parameters fixed and then fit for the other one and the BF. ...
Document
... was found to be located 8 billion light years away. If our universe is approximately 15 billion years old, when did the quasar emit the light that we observe? A. 15 years ago B. 7 billion years ago C. 8 billion years ago D. 15 billion years ago ...
... was found to be located 8 billion light years away. If our universe is approximately 15 billion years old, when did the quasar emit the light that we observe? A. 15 years ago B. 7 billion years ago C. 8 billion years ago D. 15 billion years ago ...
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 ...
Astro Physics Notes and Study Guide 2015-17
... energy required to bump its electrons into higher orbitals because it has none. Cold hydrogen can absorb energy. Therefore, even if the emission spectrum has a dark line at hydrogen it could mean that there is hydrogen; it was just to “hot” to absorb energy. In this way, a VERY carful analysis of th ...
... energy required to bump its electrons into higher orbitals because it has none. Cold hydrogen can absorb energy. Therefore, even if the emission spectrum has a dark line at hydrogen it could mean that there is hydrogen; it was just to “hot” to absorb energy. In this way, a VERY carful analysis of th ...
It is now recognized that the vast majority of ellipticals are of
... the two interacting galaxies. Much of the diffuse glow is from multimillion degree gas. Many of the point-like sources in the x-ray image are due to black holes and neutron stars in binary star ...
... the two interacting galaxies. Much of the diffuse glow is from multimillion degree gas. Many of the point-like sources in the x-ray image are due to black holes and neutron stars in binary star ...
Living Things - Fairfield-Suisun Unified School District
... Structure of the Milky Way Our solar system is located in a spiral galaxy called the Milky Way. From the side, the Milky Way appears to be a narrow disk with a bulge in the middle. The galaxy’s spiral structure is visible only from above or below. ...
... Structure of the Milky Way Our solar system is located in a spiral galaxy called the Milky Way. From the side, the Milky Way appears to be a narrow disk with a bulge in the middle. The galaxy’s spiral structure is visible only from above or below. ...
First Light Sources at the End of the Dark Ages: Direct
... emission detectable by large ground-based telescopes, and possibly a rest-frame ultraviolet continuum observable from the ground and/or with the JWST. By 2016, the JWST and/or ground-based surveys will regularly deliver deep infrared images that reveal the most massive star-forming galaxies and prot ...
... emission detectable by large ground-based telescopes, and possibly a rest-frame ultraviolet continuum observable from the ground and/or with the JWST. By 2016, the JWST and/or ground-based surveys will regularly deliver deep infrared images that reveal the most massive star-forming galaxies and prot ...
Course 107: The Big Bang and the Anthropic Principle
... It is He that sitteth upon the circle of the earth, and the inhabitants thereof are as grasshoppers; that stretcheth out the heavens as a curtain, and spreadeth them out as a tent to dwell in:” ● Psalm 19:1 “The heavens declare the glory of God.” Lesson: What is within the realm of possibility? ● Th ...
... It is He that sitteth upon the circle of the earth, and the inhabitants thereof are as grasshoppers; that stretcheth out the heavens as a curtain, and spreadeth them out as a tent to dwell in:” ● Psalm 19:1 “The heavens declare the glory of God.” Lesson: What is within the realm of possibility? ● Th ...
Here
... There are some common problems with CCDs, which need to be taken into account in every observational program: -read-out noise (random fluctuations in the count rate: 3-10 e/pixel) -dark counts (failure to respond to currents, or electrons without an incident signal -> cooled down to 100-200 K) -Cosm ...
... There are some common problems with CCDs, which need to be taken into account in every observational program: -read-out noise (random fluctuations in the count rate: 3-10 e/pixel) -dark counts (failure to respond to currents, or electrons without an incident signal -> cooled down to 100-200 K) -Cosm ...
Chapter 18 The Interstellar Medium - University of Texas Astronomy
... Emission nebula: Glows, due to emission lines from gas heated by hot young stars (a way to find where stars have recently formed). Emission nebulae generally glow red—this is the Hα line of hydrogen. But others shine primarily in green light from an ionized oxygen line. The dark dust lanes visible i ...
... Emission nebula: Glows, due to emission lines from gas heated by hot young stars (a way to find where stars have recently formed). Emission nebulae generally glow red—this is the Hα line of hydrogen. But others shine primarily in green light from an ionized oxygen line. The dark dust lanes visible i ...
Hoffmann_Photon_Science_Novosibirsk_1__2015
... The answer is Peccei-Quinn mechanism ⇒ Introduce the axion field a(x) interacting with the gluon field ...
... The answer is Peccei-Quinn mechanism ⇒ Introduce the axion field a(x) interacting with the gluon field ...
The Milky Way - The Independent School
... are classified into different types, and that will lead you to insights into how galaxies form and evolve. In the next chapter, you will discover that some galaxies are violently active, and that will give you more clues to the evolution of galaxies. ...
... are classified into different types, and that will lead you to insights into how galaxies form and evolve. In the next chapter, you will discover that some galaxies are violently active, and that will give you more clues to the evolution of galaxies. ...
Think about the universe
... above right, is not a star. It is a quasar called PG 0052+251. It emits much more light than any star could. Quasars are found only at very large distances from the solar system. Observations of distant objects like quasars provide clues about how the universe began. THINK ...
... above right, is not a star. It is a quasar called PG 0052+251. It emits much more light than any star could. Quasars are found only at very large distances from the solar system. Observations of distant objects like quasars provide clues about how the universe began. THINK ...
Document
... far larger than previously thought. Galaxies are the fundamental units of the Universe, just as stars are the basic units of galaxies. Like stars, many galaxies are found in clusters, and there are also superclusters separated by enormous voids. By looking back in time at very distant ...
... far larger than previously thought. Galaxies are the fundamental units of the Universe, just as stars are the basic units of galaxies. Like stars, many galaxies are found in clusters, and there are also superclusters separated by enormous voids. By looking back in time at very distant ...
The Strikingly Uniform, Highly Turbulent Interstellar Medium of the
... very broad, 500–600 km s−1 wide, extending throughout the entire galaxy over about 2.5 kpc, with modest shear. Such a large, homogeneous velocity dispersion indicates a highly turbulent medium. W2246-0526 is unstable in terms of the energy and momentum that are being injected into the ISM, strongly ...
... very broad, 500–600 km s−1 wide, extending throughout the entire galaxy over about 2.5 kpc, with modest shear. Such a large, homogeneous velocity dispersion indicates a highly turbulent medium. W2246-0526 is unstable in terms of the energy and momentum that are being injected into the ISM, strongly ...
Chapter-by-Chapter Guide
... A geocentric universe is one in which the Earth is assumed to be at the center of everything. In contrast, our current view of the universe suggests that Earth is a rather ordinary planet orbiting a rather ordinary star in an ordinary galaxy, and there is nothing “central” about Earth at all. The la ...
... A geocentric universe is one in which the Earth is assumed to be at the center of everything. In contrast, our current view of the universe suggests that Earth is a rather ordinary planet orbiting a rather ordinary star in an ordinary galaxy, and there is nothing “central” about Earth at all. The la ...
3D Tour of the Universe Template
... to a recession velocity of about 1,000 km/sec ( caused by the Hubble effect, i.e. the cosmic expansion). This was too fast for the Sombrero to be an object in our Milky Way galaxy. M104 is the dominating member of its own small group of galaxies, the M104 group, or NGC 4594 group of galaxies. The Wh ...
... to a recession velocity of about 1,000 km/sec ( caused by the Hubble effect, i.e. the cosmic expansion). This was too fast for the Sombrero to be an object in our Milky Way galaxy. M104 is the dominating member of its own small group of galaxies, the M104 group, or NGC 4594 group of galaxies. The Wh ...
The ultra-luminous x-ray sources near center of M82
... Best Candidate of IMBH – M82 X-1 has luminosity ~ 1041 erg/sec not at the center of the galaxy => Not an AGN has a period of 62 days very close to a young star cluster MGG-11 has quasi-periodic oscillation (QPO) around 55 mHz has a mass > 500 Msolar ...
... Best Candidate of IMBH – M82 X-1 has luminosity ~ 1041 erg/sec not at the center of the galaxy => Not an AGN has a period of 62 days very close to a young star cluster MGG-11 has quasi-periodic oscillation (QPO) around 55 mHz has a mass > 500 Msolar ...
Lambda-CDM model
The ΛCDM (Lambda cold dark matter) or Lambda-CDM model is a parametrization of the Big Bang cosmological model in which the universe contains a cosmological constant, denoted by Lambda (Greek Λ), associated with dark energy, and cold dark matter (abbreviated CDM). It is frequently referred to as the standard model of Big Bang cosmology, because it is the simplest model that provides a reasonably good account of the following properties of the cosmos: the existence and structure of the cosmic microwave background the large-scale structure in the distribution of galaxies the abundances of hydrogen (including deuterium), helium, and lithium the accelerating expansion of the universe observed in the light from distant galaxies and supernovaeThe model assumes that general relativity is the correct theory of gravity on cosmological scales.It emerged in the late 1990s as a concordance cosmology, after a period of time when disparate observed properties of the universe appeared mutually inconsistent, and there was no consensus on the makeup of the energy density of the universe.The ΛCDM model can be extended by adding cosmological inflation, quintessence and other elements that are current areas of speculation and research in cosmology.Some alternative models challenge the assumptions of the ΛCDM model. Examples of these are modified Newtonian dynamics, modified gravity and theories of large-scale variations in the matter density of the universe.