- Cosmotography
... dwarfs have been identified observationally (Stinson et al. 2009), but it is not clear if these stars were accreted, or formed in-situ. Star formation in dwarfs is thought to occur in stochastic episodes (Tolstoy et al. 2009; Weisz et al. 2011), which could be triggered by accretion events. An iconi ...
... dwarfs have been identified observationally (Stinson et al. 2009), but it is not clear if these stars were accreted, or formed in-situ. Star formation in dwarfs is thought to occur in stochastic episodes (Tolstoy et al. 2009; Weisz et al. 2011), which could be triggered by accretion events. An iconi ...
2. The World at Large: From the Big Bang to Black Holes
... doorstep at night and look at the stars in the sky. Why is the sky between the stars dark? If the stars were distributed uniformly in space, were shining forever without change, then there would be no gap between the stars. In every direction you would see a star – some close, some far away. The nig ...
... doorstep at night and look at the stars in the sky. Why is the sky between the stars dark? If the stars were distributed uniformly in space, were shining forever without change, then there would be no gap between the stars. In every direction you would see a star – some close, some far away. The nig ...
The Star-Galaxy Era of Big History in the Light of Universal
... The formation of clouds (and later stars and galaxies) meant a concentration of matter on enormous scale, which could have been caused only by gravity. However, this only force is insufficient for structuring, because in ‘an absolutely homogenous universe the emergence of large-scale structures (gal ...
... The formation of clouds (and later stars and galaxies) meant a concentration of matter on enormous scale, which could have been caused only by gravity. However, this only force is insufficient for structuring, because in ‘an absolutely homogenous universe the emergence of large-scale structures (gal ...
A Search for New Solar-Type Post-T Tauri Stars in
... by the AIS, due to avoidance of the galactic plane, is young stars. According to Fischer (1998; PhD Thesis, UCSC) only 1% (2/189) of a volume-limited (d < 25 pc) sample of K stars have lithium abundances and chromospheric activity suggesting ages possibly <100 Myr, with an additional 6% (11/189) pla ...
... by the AIS, due to avoidance of the galactic plane, is young stars. According to Fischer (1998; PhD Thesis, UCSC) only 1% (2/189) of a volume-limited (d < 25 pc) sample of K stars have lithium abundances and chromospheric activity suggesting ages possibly <100 Myr, with an additional 6% (11/189) pla ...
Dark Matter In The 21st Century
... 3) The laws of physics are different in the Coma cluster than in our galaxy 4) The vast majority of the Coma cluster’s mass is in non-luminous material (dark matter) To discriminate between these various possibilities, it would be necessary to study other clusters and see if they too had large mass ...
... 3) The laws of physics are different in the Coma cluster than in our galaxy 4) The vast majority of the Coma cluster’s mass is in non-luminous material (dark matter) To discriminate between these various possibilities, it would be necessary to study other clusters and see if they too had large mass ...
POISE AND EVOLUTION OF THE GALAXY : STRUCTURE ,
... which might be at the origin of phenomena in astronomy as quizzical as the mysteriously intensely radiating “QUASARS”, that basic astrophysics cannot easily interpret through usual frames. That might be, as well, some origin of the elusive “dark energy”, if not of the unaccountable “dark mass”, acco ...
... which might be at the origin of phenomena in astronomy as quizzical as the mysteriously intensely radiating “QUASARS”, that basic astrophysics cannot easily interpret through usual frames. That might be, as well, some origin of the elusive “dark energy”, if not of the unaccountable “dark mass”, acco ...
Refracting vs Reflecting Telescopes
... •HALCA, an 8 meter radio telescope - launched in February 1997 - made observations until October 2003, •small size of the dish - only very strong radio sources could be observed with •Spektr-R (or RadioAstron) - launched in July 2011. When Global VLBI combined with one or more space-based VLBI anten ...
... •HALCA, an 8 meter radio telescope - launched in February 1997 - made observations until October 2003, •small size of the dish - only very strong radio sources could be observed with •Spektr-R (or RadioAstron) - launched in July 2011. When Global VLBI combined with one or more space-based VLBI anten ...
How do stars appear to move to an observer on the
... brighter for a short time. Some white dwarfs do not just cool, they have one or more large explosions. Astronomers think this may be caused by a companion star that is having material taken from it by the white dwarf. ...
... brighter for a short time. Some white dwarfs do not just cool, they have one or more large explosions. Astronomers think this may be caused by a companion star that is having material taken from it by the white dwarf. ...
doc - Eu-Hou
... 2. Open the image images_power10/BeyondSS/m16.tif with “File/Open” or the “Open Image File” icon. This is an image taken with the Hubble Space Telescope. It displays gas pillars, which are part of the "Eagle Nebula" Messier 16, a nearby star-forming region 7,000 lightyears4 away in the constellation ...
... 2. Open the image images_power10/BeyondSS/m16.tif with “File/Open” or the “Open Image File” icon. This is an image taken with the Hubble Space Telescope. It displays gas pillars, which are part of the "Eagle Nebula" Messier 16, a nearby star-forming region 7,000 lightyears4 away in the constellation ...
Two Summers in the UCSC Science Internship Program
... to find a young, recently formed star in isolation. This anomalous behavior makes field stars an exciting and hotly debated subject. One theory proposes that field stars do, in fact, form by themselves; another claims that field stars are runaway stars that escaped from their original clusters at hi ...
... to find a young, recently formed star in isolation. This anomalous behavior makes field stars an exciting and hotly debated subject. One theory proposes that field stars do, in fact, form by themselves; another claims that field stars are runaway stars that escaped from their original clusters at hi ...
26.Meikle.Supernova_2002hh
... ejecta. Supernovae are suspected to be a major source of dust in the universe and the presence of new dust in SN 2002hh is expected to be observed at a later stage. This is only the second time for which a spectrum has been obtained of a supernova in 2.9-4.1 micron range (the other was SN 1987A whic ...
... ejecta. Supernovae are suspected to be a major source of dust in the universe and the presence of new dust in SN 2002hh is expected to be observed at a later stage. This is only the second time for which a spectrum has been obtained of a supernova in 2.9-4.1 micron range (the other was SN 1987A whic ...
Bad Seeing Bad Focus Bad Guiding
... astigmatism as opposed to EW or NS which would likely be caused by bad guiding. Fix: Take focus frames, or focus with whatever method is appropriate for that telescope. A radial profile plot of stars in the image shows scatter, especially near base of the stellar image. This scatter is due to the fa ...
... astigmatism as opposed to EW or NS which would likely be caused by bad guiding. Fix: Take focus frames, or focus with whatever method is appropriate for that telescope. A radial profile plot of stars in the image shows scatter, especially near base of the stellar image. This scatter is due to the fa ...
Dynamical properties of a large young disk galaxy at z=2.03⋆
... 70 L⊙ ) and their number density exceeds model predictions (e.g., Mo et al., 1998) by a factor of two. Obviously, the first and foremost question that needs to be resolved is whether these objects are truly rotationally supported disks, and this can only be tested by obtaining kinematic data. In thi ...
... 70 L⊙ ) and their number density exceeds model predictions (e.g., Mo et al., 1998) by a factor of two. Obviously, the first and foremost question that needs to be resolved is whether these objects are truly rotationally supported disks, and this can only be tested by obtaining kinematic data. In thi ...
Emission from dust in galaxies: Metallicity dependence
... (SFR). However, the effect of the dust-to-gas ratio (i.e., amount of the dust) on the conversion law from IR luminosity to SFR has not so far been considered. Then, in this paper, we present a convenient analytical formula including this effect. In order to obtain the dependence on the dust-to-gas r ...
... (SFR). However, the effect of the dust-to-gas ratio (i.e., amount of the dust) on the conversion law from IR luminosity to SFR has not so far been considered. Then, in this paper, we present a convenient analytical formula including this effect. In order to obtain the dependence on the dust-to-gas r ...
Written in the stars THE NOBEL PRIZE IN PHYSICS 2011
... Supernovae – the new measure of the Universe When Einstein got rid of the cosmological constant and surrendered to the idea of a non-static Universe, he related the geometrical shape of the Universe to its fate. Is it open or closed, or is it something in between – a flat Universe? An open Universe ...
... Supernovae – the new measure of the Universe When Einstein got rid of the cosmological constant and surrendered to the idea of a non-static Universe, he related the geometrical shape of the Universe to its fate. Is it open or closed, or is it something in between – a flat Universe? An open Universe ...
Binary Beauties: By John R - Black River Astronomical Society
... rotating the filter at the eyepiece or camera, the object's reflective properties can be manipulated to produce artificial color and increased contrast. The second polarized filter type is comprised of two layers of polarized material. The 2nd layer is mounted immediately above the 1st and is meant ...
... rotating the filter at the eyepiece or camera, the object's reflective properties can be manipulated to produce artificial color and increased contrast. The second polarized filter type is comprised of two layers of polarized material. The 2nd layer is mounted immediately above the 1st and is meant ...
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.