F P US R
... phenomena control this expansion? Twenty years ago, most astronomers thought that the cosmic expansion could be described by Friedmann solutions with no cosmological constant. The values of the Hubble constant (H0) and the age of the universe had uncertainties of roughly a factor of two. Today, we k ...
... phenomena control this expansion? Twenty years ago, most astronomers thought that the cosmic expansion could be described by Friedmann solutions with no cosmological constant. The values of the Hubble constant (H0) and the age of the universe had uncertainties of roughly a factor of two. Today, we k ...
astronomy (astr)
... Permission of the instructor. One-week field experience at the National Radio Astronomy Observatory in Green Bank, WV, for experiential education (EE) credit. Observing with radio telescopes and antennae: supernova remnants, star-forming regions, normal and active galaxies, quasars, solar system obj ...
... Permission of the instructor. One-week field experience at the National Radio Astronomy Observatory in Green Bank, WV, for experiential education (EE) credit. Observing with radio telescopes and antennae: supernova remnants, star-forming regions, normal and active galaxies, quasars, solar system obj ...
sections 19-22 instructor notes
... local deviations from circular motion, to any errors in the adopted LSR velocity of the Sun, and even to slight errors in l0. Crampton et al. (MNRAS, 176, 683, 1976) used the technique to obtain a value of R0 = 8.4 ±1.0 kpc for B stars, not an unreasonable result. Interesting results have been deriv ...
... local deviations from circular motion, to any errors in the adopted LSR velocity of the Sun, and even to slight errors in l0. Crampton et al. (MNRAS, 176, 683, 1976) used the technique to obtain a value of R0 = 8.4 ±1.0 kpc for B stars, not an unreasonable result. Interesting results have been deriv ...
sections 19-22 instructor notes
... local deviations from circular motion, to any errors in the adopted LSR velocity of the Sun, and even to slight errors in l0. Crampton et al. (MNRAS, 176, 683, 1976) used the technique to obtain a value of R0 = 8.4 ±1.0 kpc for B stars, not an unreasonable result. Interesting results have been deriv ...
... local deviations from circular motion, to any errors in the adopted LSR velocity of the Sun, and even to slight errors in l0. Crampton et al. (MNRAS, 176, 683, 1976) used the technique to obtain a value of R0 = 8.4 ±1.0 kpc for B stars, not an unreasonable result. Interesting results have been deriv ...
Is Draco II one of the faintest dwarf galaxies? First study from Keck
... probability, appearing as the only dark blue data point beyond the 2rh ellipse in the right-hand panel of Figure 1. However, the faint magnitude of this star translates into a large velocity uncertainty (5.7 km s−1 ) and, consequently, keeping or removing it from the sample of members does not impac ...
... probability, appearing as the only dark blue data point beyond the 2rh ellipse in the right-hand panel of Figure 1. However, the faint magnitude of this star translates into a large velocity uncertainty (5.7 km s−1 ) and, consequently, keeping or removing it from the sample of members does not impac ...
Superbubble Activity in Star-Forming Galaxies M. S. Oey
... thus be of great interest to determine Lx for these objects with XMMNewton or Chandra. Also, an interface region between the hot gas and cooler shells should generate intermediate temperatures and ions. Chu et al. (1994) searched a number sightlines through LMC superbubbles and confirmed the existen ...
... thus be of great interest to determine Lx for these objects with XMMNewton or Chandra. Also, an interface region between the hot gas and cooler shells should generate intermediate temperatures and ions. Chu et al. (1994) searched a number sightlines through LMC superbubbles and confirmed the existen ...
The fate of black hole singularities and the parameters of the
... puzzle becomes a crisis, as first realized by Hawking in 1974, because of the problem of the loss of information constituting the quantum state of the star whose collapse formed the black hole[3]. Another basic problem of physics is to understand why the masses and coupling constants of the elementa ...
... puzzle becomes a crisis, as first realized by Hawking in 1974, because of the problem of the loss of information constituting the quantum state of the star whose collapse formed the black hole[3]. Another basic problem of physics is to understand why the masses and coupling constants of the elementa ...
VLT identifications in the Chandra/XMM
... obscuration fraction (ratio of type2/type-1 AGN) from 4:1 in the local universe to much larger covering fractions (10:1) at high redshifts (see also Fabian et al., 1998). The gas to dust ratio in high-redshift, high-luminosity AGN could be completely different from the usually assumed galactic value ...
... obscuration fraction (ratio of type2/type-1 AGN) from 4:1 in the local universe to much larger covering fractions (10:1) at high redshifts (see also Fabian et al., 1998). The gas to dust ratio in high-redshift, high-luminosity AGN could be completely different from the usually assumed galactic value ...
Chapter 12: Stars and Galaxies
... Real-World Reading Connection Have you ever wondered how stars generate the light that allows us to see them in the night sky? You may have noticed that some stars appear blue or ...
... Real-World Reading Connection Have you ever wondered how stars generate the light that allows us to see them in the night sky? You may have noticed that some stars appear blue or ...
The chemical enrichment of the ICM from hydrodynamical simulations
... complexity. Raiteri et al. (1996) presented SPH simulations of the Galaxy, forming in an isolated halo, by following iron and oxygen production from SN II and SN Ia, also accounting for the effect of stellar lifetimes. Mosconi et al. (2001) performed a detailed analysis of chemo–dynamical SPH simula ...
... complexity. Raiteri et al. (1996) presented SPH simulations of the Galaxy, forming in an isolated halo, by following iron and oxygen production from SN II and SN Ia, also accounting for the effect of stellar lifetimes. Mosconi et al. (2001) performed a detailed analysis of chemo–dynamical SPH simula ...
Camelopardalis-Better-Know-A-Constellation
... Can be seen in binoculars from country skies, sometimes fools comet hunters. NGC 2403 possesses about 100 emission regions as well as 27 variable stars. Larger instruments will reveal many of these regions that seem to take on likeliness to M33. Three supernovae have been spotted in this galaxy, one ...
... Can be seen in binoculars from country skies, sometimes fools comet hunters. NGC 2403 possesses about 100 emission regions as well as 27 variable stars. Larger instruments will reveal many of these regions that seem to take on likeliness to M33. Three supernovae have been spotted in this galaxy, one ...
How To Find Newborn Black Holes Kazumi Kashiyama (UCB)
... required to form a stable disk at the last stable orbit of a Schwarzschild black hole (lower curve) or Kerr black hole (upper curve) including the given mass. The intermediate curve that follows the Schwarzschild curve until far out in the star uses the integrated angular momentum in the model to de ...
... required to form a stable disk at the last stable orbit of a Schwarzschild black hole (lower curve) or Kerr black hole (upper curve) including the given mass. The intermediate curve that follows the Schwarzschild curve until far out in the star uses the integrated angular momentum in the model to de ...
Markov Chain Monte Carlo Modeling of High-Redshift Quasar
... Quasars, the visible phenomena associated with the active accretion phase of supermassive black holes found in the centers of galaxies, represent one of the most energetic processes in the Universe. As matter falls into the central black hole, it is accelerated and collisionally heated, and the radi ...
... Quasars, the visible phenomena associated with the active accretion phase of supermassive black holes found in the centers of galaxies, represent one of the most energetic processes in the Universe. As matter falls into the central black hole, it is accelerated and collisionally heated, and the radi ...
Magnificent Cosmos - Academic Program Pages at Evergreen
... because of a closely orbiting planet, which revolves around the star fully every 4.2 days—at a whopping speed of 482,000 kilometers (299,000 miles) an hour, more than four times faster than Earth orbits the sun. Another survey of 107 sunlike stars, performed by our team at San Francisco State Univer ...
... because of a closely orbiting planet, which revolves around the star fully every 4.2 days—at a whopping speed of 482,000 kilometers (299,000 miles) an hour, more than four times faster than Earth orbits the sun. Another survey of 107 sunlike stars, performed by our team at San Francisco State Univer ...
Observational Studies of Interacting Galaxies and the Development
... we worked on together. I have learned a lot from you, including how to conduct observations, reduce data and write papers, etc. Suresh, I owe you a big thank for helping me in instrument developments. I have learned basic optics, experimental techniques and trouble shooting from you. I really enjoye ...
... we worked on together. I have learned a lot from you, including how to conduct observations, reduce data and write papers, etc. Suresh, I owe you a big thank for helping me in instrument developments. I have learned basic optics, experimental techniques and trouble shooting from you. I really enjoye ...
Variations in the Star Formation Efficiency of the Dense Molecular
... We present a new survey of HCN (1–0) emission, a tracer of dense molecular gas, focused on the littleexplored regime of normal star-forming galaxy disks. Combining HCN, CO, and infrared (IR) emission, we investigate the role of dense gas in star formation, finding systematic variations in both the a ...
... We present a new survey of HCN (1–0) emission, a tracer of dense molecular gas, focused on the littleexplored regime of normal star-forming galaxy disks. Combining HCN, CO, and infrared (IR) emission, we investigate the role of dense gas in star formation, finding systematic variations in both the a ...
The cosmological significance of high
... investigations of its stellar content. The H I mass of the cloud is 2.0 × 107 (d/27 kpc)2 M⊙ , making Complex H one of the most massive HVCs if its distance is more than ∼ 20 kpc. Virtually all similar H I clouds in other galaxy groups are associated with low surface brightness dwarf galaxies. We se ...
... investigations of its stellar content. The H I mass of the cloud is 2.0 × 107 (d/27 kpc)2 M⊙ , making Complex H one of the most massive HVCs if its distance is more than ∼ 20 kpc. Virtually all similar H I clouds in other galaxy groups are associated with low surface brightness dwarf galaxies. We se ...
AR2013 - Vatican Observatory
... already-existing stellar databases and archived data available, such as from HST, SDSS, Spitzer, GALEX, Kepler, and soon-to-be available GAIA data (just to name a few) with future observational projects with telescopes (such as VATT). Asteroseismology: The Kepler and CoRot missions have provided a ...
... already-existing stellar databases and archived data available, such as from HST, SDSS, Spitzer, GALEX, Kepler, and soon-to-be available GAIA data (just to name a few) with future observational projects with telescopes (such as VATT). Asteroseismology: The Kepler and CoRot missions have provided a ...
1 Dark matter and dark energy comprise over 90% of the Universe
... the IR and near-IR part of the spectrum. The studies conducted by the MACHO collaborators focused on photometry data most likely to contain candidates for microlensing, which was MACHO-LMC-5 and MACHO-LMC20, hereafter referred to as Event-5 and Event-20. Event-5 was also recorded with HST. Great pro ...
... the IR and near-IR part of the spectrum. The studies conducted by the MACHO collaborators focused on photometry data most likely to contain candidates for microlensing, which was MACHO-LMC-5 and MACHO-LMC20, hereafter referred to as Event-5 and Event-20. Event-5 was also recorded with HST. Great pro ...
Andromeda *ruler of men*
... to view Andromeda is during the month of November with the suggested time being 9pm. It occupies 722 square degrees and is located close to the North Pole in the first quadrant of the Northern Hemisphere. Andromeda can be seen at latitudes between +90 degrees and -40 degrees. Using the equatorial co ...
... to view Andromeda is during the month of November with the suggested time being 9pm. It occupies 722 square degrees and is located close to the North Pole in the first quadrant of the Northern Hemisphere. Andromeda can be seen at latitudes between +90 degrees and -40 degrees. Using the equatorial co ...
The new X-ray universe
... 1041 erg s–1). While the existence of such objects was hinted at by earlier missions, a substantial number have now been found in Chandra and XMM observations of nearby galaxies. If scaled simply relative to accreting X-ray binaries in our own galaxy, then this suggests that they may be accreting bl ...
... 1041 erg s–1). While the existence of such objects was hinted at by earlier missions, a substantial number have now been found in Chandra and XMM observations of nearby galaxies. If scaled simply relative to accreting X-ray binaries in our own galaxy, then this suggests that they may be accreting bl ...
The Age Distribution of Potential Intelligent Life in the Milky Way
... conducting this study was the fact that this question had not been explored in significant detail previously, which is surprising considering that the data required to conduct a study such as this has existed for some time. However, in recent years analysis of exoplanetary data has yielded invaluabl ...
... conducting this study was the fact that this question had not been explored in significant detail previously, which is surprising considering that the data required to conduct a study such as this has existed for some time. However, in recent years analysis of exoplanetary data has yielded invaluabl ...
Where stars form: inside-out growth and coherent star formation from
... We present Hα maps at 1 kpc spatial resolution for star-forming galaxies at z ∼ 1, made possible by the WFC3 grism on HST. Employing this capability over all five 3D-HST/CANDELS fields provides a sample of 2676 galaxies enabling a division into subsamples based on stellar mass and star formation rat ...
... We present Hα maps at 1 kpc spatial resolution for star-forming galaxies at z ∼ 1, made possible by the WFC3 grism on HST. Employing this capability over all five 3D-HST/CANDELS fields provides a sample of 2676 galaxies enabling a division into subsamples based on stellar mass and star formation rat ...
AS 4022: Cosmology - ASTRONOMY GROUP – University of St
... – moving in a slow dance around the center of galaxies. ...
... – moving in a slow dance around the center of galaxies. ...
Galaxy Zoo
Galaxy Zoo is a crowdsourced astronomy project which invites people to assist in the morphological classification of large numbers of galaxies. (e.g.) It is an example of citizen science as it enlists the help of members of the public to help in scientific research. There have been seven versions up to July 2014, which are outlined in this article. Galaxy Zoo is part of the Zooniverse, a group of citizen science projects.