1.2.43The stellar populations of the Milky Way
... stars, which is consistent with star formation in the spheroid ceasing long ago. Because this population is so old, only low-mass stars (which have long lifetimes) still shine as main sequence stars burning hydrogen in their cores. The more massive stars that formed at the same time as the surviving ...
... stars, which is consistent with star formation in the spheroid ceasing long ago. Because this population is so old, only low-mass stars (which have long lifetimes) still shine as main sequence stars burning hydrogen in their cores. The more massive stars that formed at the same time as the surviving ...
31-2 - Fremont Peak Observatory
... Eyes.” The Cat’s Eyes, λ and υ-Scorpii, are located at the Scorpion’s stinger on the tail of the scorpion. Lambda-Scorpii, Shaula, is the second brightest star in Scorpius (magnitude +1.6) and is also the 24th brightest fixed star on the celestial sphere. Lambda is actually a spectroscopic triple sy ...
... Eyes.” The Cat’s Eyes, λ and υ-Scorpii, are located at the Scorpion’s stinger on the tail of the scorpion. Lambda-Scorpii, Shaula, is the second brightest star in Scorpius (magnitude +1.6) and is also the 24th brightest fixed star on the celestial sphere. Lambda is actually a spectroscopic triple sy ...
Markov Chain Monte Carlo Modeling of High-Redshift Quasar
... Balmer series of Hydrogen, with a systematic redshift of z = 0.158, confirming its nature as an extremely luminous extragalactic object. It was found that the dominant optical emission in quasars comes from an extremely compact region located in the nucleus of a host galaxy, with this nuclear emissi ...
... Balmer series of Hydrogen, with a systematic redshift of z = 0.158, confirming its nature as an extremely luminous extragalactic object. It was found that the dominant optical emission in quasars comes from an extremely compact region located in the nucleus of a host galaxy, with this nuclear emissi ...
Gamma-Ray Bursts and Puzzles of Core
... by spectra of brighter galaxies. With regard to these effects, the R distribution of z for GRB host galaxies well follows the Hubble course for all other “normal” (non-peculiar) galaxies of the deep survey. (In this picture one can see galaxies of large and small luminosities up to dwarfs for identi ...
... by spectra of brighter galaxies. With regard to these effects, the R distribution of z for GRB host galaxies well follows the Hubble course for all other “normal” (non-peculiar) galaxies of the deep survey. (In this picture one can see galaxies of large and small luminosities up to dwarfs for identi ...
The Final Version of the White Paper is available.
... search for solar system analogues is still on going, the first spectra of exoplanets have been taken, signalling the shift from an era of discovery to one of physical and chemical characterization. This will eventually lead to the remote analysis of planet atmospheres with the ultimate goal of life ...
... search for solar system analogues is still on going, the first spectra of exoplanets have been taken, signalling the shift from an era of discovery to one of physical and chemical characterization. This will eventually lead to the remote analysis of planet atmospheres with the ultimate goal of life ...
The old globular cluster system of the dIrr galaxy NGC 1427A in the
... In all these models, the GCSs of low-mass dwarf galaxies, the most numerous galaxy type in galaxy clusters (Sandage 2005, and references therein), are envisioned as the building blocks of the GCSs of the more massive galaxies. At present the role of the GCSs of dIrr galaxies in the frame of galaxy f ...
... In all these models, the GCSs of low-mass dwarf galaxies, the most numerous galaxy type in galaxy clusters (Sandage 2005, and references therein), are envisioned as the building blocks of the GCSs of the more massive galaxies. At present the role of the GCSs of dIrr galaxies in the frame of galaxy f ...
7 November 2012 X-ray Astrophysics
... X-rays are very energetic photons, and can most simply be produced by very hot matter in what is known as thermal emission. To get something to glow in the optical, it needs to be heated to temperatures of thousands of degrees; as an Xray photon has over a thousand times more energy than an optical ...
... X-rays are very energetic photons, and can most simply be produced by very hot matter in what is known as thermal emission. To get something to glow in the optical, it needs to be heated to temperatures of thousands of degrees; as an Xray photon has over a thousand times more energy than an optical ...
ISP 205: Visions of the Universe
... A. Because no galaxies exist at such a great distance. B. Galaxies may exist at that distance, but their light would be too faint for our telescopes to see. C. Because looking 15 billion light-years away means looking to a time before the universe existed. ...
... A. Because no galaxies exist at such a great distance. B. Galaxies may exist at that distance, but their light would be too faint for our telescopes to see. C. Because looking 15 billion light-years away means looking to a time before the universe existed. ...
X-ray astronomy - University of Warwick
... • Conventional dispersed spectroscopy possible using transmission or reflection gratings (at grazing incidence) ...
... • Conventional dispersed spectroscopy possible using transmission or reflection gratings (at grazing incidence) ...
uniview glossary - DMNS Galaxy Guide Portal
... the size of Earth, it rotates in a day of 24.5 hours, and obits the sun in 687 Earth days (about 1.9 or 2 years). The daytime temperature starts at minus 21 degrees F. and rises to about 32 degrees F. Nights can get to minus 191 degrees F. The Valles Marineris Canyon, or Mars’ Grand Canyon, stretche ...
... the size of Earth, it rotates in a day of 24.5 hours, and obits the sun in 687 Earth days (about 1.9 or 2 years). The daytime temperature starts at minus 21 degrees F. and rises to about 32 degrees F. Nights can get to minus 191 degrees F. The Valles Marineris Canyon, or Mars’ Grand Canyon, stretche ...
Chapter 14 Black Holes as Central Engines
... appeared to be points with no obvious spatial extension, just as one would expect for stars. • These were often called “radio stars”, but they had very strange characteristics for stars. • In 1963, the first two of these radio stars were associated with the radio sources 3C48 and 3C273, respectively ...
... appeared to be points with no obvious spatial extension, just as one would expect for stars. • These were often called “radio stars”, but they had very strange characteristics for stars. • In 1963, the first two of these radio stars were associated with the radio sources 3C48 and 3C273, respectively ...
An introduction to photometry and photometric measurements Henry
... travel in straight lines at the speed of light. To motivate the following mathematical definitions, imagine you are looking at the Sun. The "brightness" of the Sun appears to be about the same over most of the Sun's surface, which looks like a nearly uniform disk even though it is a sphere. This mea ...
... travel in straight lines at the speed of light. To motivate the following mathematical definitions, imagine you are looking at the Sun. The "brightness" of the Sun appears to be about the same over most of the Sun's surface, which looks like a nearly uniform disk even though it is a sphere. This mea ...
134-Notes-a
... 400 nm = 0.4 µm and red photons having wavelengths around λ = 7000 Å = 700 nm = 0.7 µm. The cones in your eyes respond more to color, but depend on having bright light, whereas the rods behave well in low light, but do not detect colors. Thus, galaxies and nebulae (low-light objects) typically will ...
... 400 nm = 0.4 µm and red photons having wavelengths around λ = 7000 Å = 700 nm = 0.7 µm. The cones in your eyes respond more to color, but depend on having bright light, whereas the rods behave well in low light, but do not detect colors. Thus, galaxies and nebulae (low-light objects) typically will ...
astronomy
... however: the basic practice of astronomy had been well established by the time humans formed the first civilisations. Since the beginning of human history, people from nearly every culture have gazed into the sky and invented stories to make sense of what they observed. Ancient Egyptians, for exampl ...
... however: the basic practice of astronomy had been well established by the time humans formed the first civilisations. Since the beginning of human history, people from nearly every culture have gazed into the sky and invented stories to make sense of what they observed. Ancient Egyptians, for exampl ...
Lecture2.2014_v4 - UCO/Lick Observatory
... b) take the same amount of time to traverse at light speed c) last twice as many months d) last half as many months ...
... b) take the same amount of time to traverse at light speed c) last twice as many months d) last half as many months ...
Document
... These gamma-ray bursts, which were seen at random places in the sky roughly once per day, are especially intriguing. ...
... These gamma-ray bursts, which were seen at random places in the sky roughly once per day, are especially intriguing. ...
Temperate Earth-sized planets transiting a nearby ultracool dwarf star
... suggest that 11 orbits remain possible for the third planet, the most likely resulting in irradiation significantly less than that received by Earth. The infrared brightness of the host star, combined with its Jupiter-like size, offers the possibility of thoroughly characterizing the components of t ...
... suggest that 11 orbits remain possible for the third planet, the most likely resulting in irradiation significantly less than that received by Earth. The infrared brightness of the host star, combined with its Jupiter-like size, offers the possibility of thoroughly characterizing the components of t ...
Summary Of the Structure of the Milky Way
... combined with its distance from the galactic center an estimate of the mass of the galaxy can be obtained. ...
... combined with its distance from the galactic center an estimate of the mass of the galaxy can be obtained. ...
ASTRO2010 SCIENCE WHITE PAPER
... sensitivity is achieved when the resolution element matches the line width, but in the (background-limited) mid-IR region, higher-resolution observations can be binned to maximize the sensitivity. Secondly, because most lines are well resolved at these high resolutions (Fig. 2), the line profile can ...
... sensitivity is achieved when the resolution element matches the line width, but in the (background-limited) mid-IR region, higher-resolution observations can be binned to maximize the sensitivity. Secondly, because most lines are well resolved at these high resolutions (Fig. 2), the line profile can ...
Hubble Deep Field
The Hubble Deep Field (HDF) is an image of a small region in the constellation Ursa Major, constructed from a series of observations by the Hubble Space Telescope. It covers an area 2.5 arcminutes across, about one 24-millionth of the whole sky, which is equivalent in angular size to a 65 mm tennis ball at a distance of 100 metres. The image was assembled from 342 separate exposures taken with the Space Telescope's Wide Field and Planetary Camera 2 over ten consecutive days between December 18 and December 28, 1995.The field is so small that only a few foreground stars in the Milky Way lie within it; thus, almost all of the 3,000 objects in the image are galaxies, some of which are among the youngest and most distant known. By revealing such large numbers of very young galaxies, the HDF has become a landmark image in the study of the early universe, with the associated scientific paper having received over 900 citations by the end of 2014.Three years after the HDF observations were taken, a region in the south celestial hemisphere was imaged in a similar way and named the Hubble Deep Field South. The similarities between the two regions strengthened the belief that the universe is uniform over large scales and that the Earth occupies a typical region in the Universe (the cosmological principle). A wider but shallower survey was also made as part of the Great Observatories Origins Deep Survey. In 2004 a deeper image, known as the Hubble Ultra-Deep Field (HUDF), was constructed from a few months of light exposure. The HUDF image was at the time the most sensitive astronomical image ever made at visible wavelengths, and it remained so until the Hubble Extreme Deep Field (XDF) was released in 2012.