Uranus
... Neptune ‘ice giants’ because most of their mass is ice and some rocky material. It appears that Uranus does not have a rocky core like Jupiter and Saturn but rather that its material is more or less uniformly distributed. ...
... Neptune ‘ice giants’ because most of their mass is ice and some rocky material. It appears that Uranus does not have a rocky core like Jupiter and Saturn but rather that its material is more or less uniformly distributed. ...
Chapter 10 Formation and evolution of the Local Group
... technique is that it determines the mass distribution at much larger radii (∼90 kpc), than gas rotation curves, that typically extend to 30 kpc. ...
... technique is that it determines the mass distribution at much larger radii (∼90 kpc), than gas rotation curves, that typically extend to 30 kpc. ...
ALMA Science Results
... – Metallicity and star formation rate surface density critical to understanding; blue compact dwarfs are ideal labs to study these effects. – IIZw40 has low metallicity (0.2 solar) and high star formation rate (0.25 Msun/yr). But low metals makes low dust, gas dissociates – ALMA provides 24pc resolu ...
... – Metallicity and star formation rate surface density critical to understanding; blue compact dwarfs are ideal labs to study these effects. – IIZw40 has low metallicity (0.2 solar) and high star formation rate (0.25 Msun/yr). But low metals makes low dust, gas dissociates – ALMA provides 24pc resolu ...
My Favorite Universe
... his series of lectures discusses 12 topics based on 12 hand-picked essays out of 100 or so written for Natural History magazine since 1995. Although they do not follow a particular curriculum, they nonetheless represent the professor’s favorite cosmic subjects. And, not surprisingly, they represent ...
... his series of lectures discusses 12 topics based on 12 hand-picked essays out of 100 or so written for Natural History magazine since 1995. Although they do not follow a particular curriculum, they nonetheless represent the professor’s favorite cosmic subjects. And, not surprisingly, they represent ...
don_lamb - New Views of the Universe
... of greatest remaining mystery of GRBs: The Nature of short GRBs Follow-up observations at X-ray, optical, and radio wavelengths have led to compelling evidence that short GRBs come from merging compact binaries (as David Eichler, Mario Livio, Tsvi Piran, and David Schramm conjectured in 1989) It ...
... of greatest remaining mystery of GRBs: The Nature of short GRBs Follow-up observations at X-ray, optical, and radio wavelengths have led to compelling evidence that short GRBs come from merging compact binaries (as David Eichler, Mario Livio, Tsvi Piran, and David Schramm conjectured in 1989) It ...
Mid-infrared imaging of the dust shell around the post
... unresolved peak is seen, which we attribute to emission from the star itself, with some evidence of faint surrounding nebulosity. This is consistent with the double-peaked nature of the SED (e.g. Hrivnak et al. 1989) and the position of the S 7.9 filter at the minimum between the optical/near-IR and ...
... unresolved peak is seen, which we attribute to emission from the star itself, with some evidence of faint surrounding nebulosity. This is consistent with the double-peaked nature of the SED (e.g. Hrivnak et al. 1989) and the position of the S 7.9 filter at the minimum between the optical/near-IR and ...
Recen t Scien ti c
... observation where the source is not detected. These criteria were chosen based on the properties of soft X-ray transients (SXT) and Be/X-ray binaries seen in the Milky Way Galaxy. We have observed some of these transient sources with the HST when they are X-ray bright, and again when they become X-r ...
... observation where the source is not detected. These criteria were chosen based on the properties of soft X-ray transients (SXT) and Be/X-ray binaries seen in the Milky Way Galaxy. We have observed some of these transient sources with the HST when they are X-ray bright, and again when they become X-r ...
THE NEUTRAL GAS DYNAMICS OF THE NEARBY MAGELLANIC
... in footnotes to Table 1) may have conspired to keep this system out of many mainstream local galaxy surveys. As we show in this work, the stellar and gaseous components of UGCA 105 contain rich morphological and kinematic structure. This work presents the first detailed study of the neutral gas dyna ...
... in footnotes to Table 1) may have conspired to keep this system out of many mainstream local galaxy surveys. As we show in this work, the stellar and gaseous components of UGCA 105 contain rich morphological and kinematic structure. This work presents the first detailed study of the neutral gas dyna ...
The most metal-poor galaxies
... the process of formation, because of their extreme metal under-abundance, more than 10 times less than solar, and even more extreme than that of HII regions found in the outskirts of spiral galaxies. At the time of this discovery the general wisdom that most galaxies (in particular the ellipticals) ...
... the process of formation, because of their extreme metal under-abundance, more than 10 times less than solar, and even more extreme than that of HII regions found in the outskirts of spiral galaxies. At the time of this discovery the general wisdom that most galaxies (in particular the ellipticals) ...
PDF - Department of Statistics
... off. The resulting “exposures” are very long: data will be read out continuously and we will only close the shutters when we wish to monitor another star field. Figure 3 shows the data-taking process at two different time-points. Figure 4 shows a section of a simulated zipper mode image. The alterna ...
... off. The resulting “exposures” are very long: data will be read out continuously and we will only close the shutters when we wish to monitor another star field. Figure 3 shows the data-taking process at two different time-points. Figure 4 shows a section of a simulated zipper mode image. The alterna ...
Document
... The above mentioned quantum correlations are fully developed on time scales of the order of the inverse optical bandwidth. For instance, with the very narrow band pass of 1 A (0.1 nm) in the visible, through a definite polarization state, typical time scales are 10-11 seconds (10 picoseconds). Howe ...
... The above mentioned quantum correlations are fully developed on time scales of the order of the inverse optical bandwidth. For instance, with the very narrow band pass of 1 A (0.1 nm) in the visible, through a definite polarization state, typical time scales are 10-11 seconds (10 picoseconds). Howe ...
X-ray Astronomy and the search for Black Holes
... • The hard X-rays are thin thermal emissions, i.e., from plasma accreting onto the white dwarf – Are our inference for very massive white dwarfs correct? ...
... • The hard X-rays are thin thermal emissions, i.e., from plasma accreting onto the white dwarf – Are our inference for very massive white dwarfs correct? ...
Option D – Astrophysics
... a star and it is very similar to billions of other stars in the universe. It has many objects orbiting around it that are held in their orbits by gravity. The solar system is an example of a planetary system. Most of the planets have one or more objects orbiting around them. These are called moons. ...
... a star and it is very similar to billions of other stars in the universe. It has many objects orbiting around it that are held in their orbits by gravity. The solar system is an example of a planetary system. Most of the planets have one or more objects orbiting around them. These are called moons. ...
Milky Way inner halo reveals its age | COSMOS magazine
... halo of the Milky Way are 11.4 billion years old, which is within the range of previous estimates of 10 to 14 billion years. The oldest reliably aged cluster of stars in the outer halo region to date is 13.5 billion years old. White dwarf stars form when normal stars like the sun have burnt up all t ...
... halo of the Milky Way are 11.4 billion years old, which is within the range of previous estimates of 10 to 14 billion years. The oldest reliably aged cluster of stars in the outer halo region to date is 13.5 billion years old. White dwarf stars form when normal stars like the sun have burnt up all t ...
GAIA A Stereoscopic Census of our Galaxy
... RR Lyrae stars in the field – no RR Lyr 126 RR Lyraes with < V > = 10 to 12.5 (7502500 pc) (Fernley et al. 1998) from Hipparcos data ΔMv = ± 0.02-0.05 mag all individual RR Lyrae stars within 3 kpc will have σ(π)/π < 1% RR Lyraes in globular clusters mean distance to better than 1% for 110 glo ...
... RR Lyrae stars in the field – no RR Lyr 126 RR Lyraes with < V > = 10 to 12.5 (7502500 pc) (Fernley et al. 1998) from Hipparcos data ΔMv = ± 0.02-0.05 mag all individual RR Lyrae stars within 3 kpc will have σ(π)/π < 1% RR Lyraes in globular clusters mean distance to better than 1% for 110 glo ...
Science performance of Gaia, ESA`s space
... • Gaia will detect tens of thousands of brown dwarfs, both drifting through space in isolation and in orbit around other stars (Haywood and Jordi 2002). This data is vital for investigating the physics of star formation since brown dwarfs represent stars that “just did not make it” to core hydrogen ...
... • Gaia will detect tens of thousands of brown dwarfs, both drifting through space in isolation and in orbit around other stars (Haywood and Jordi 2002). This data is vital for investigating the physics of star formation since brown dwarfs represent stars that “just did not make it” to core hydrogen ...
The Evolution of Star Formation Activity in . Cory R. Wagner
... 2006; Clemens et al. 2009; Edwards & Fadda 2011). Studies of cluster galaxy populations to z . 1 find that the evolution in the color and scatter of cluster red-sequences is consistent with simple passive evolution models in which the bulk of galaxies’ stars formed in a short, high-redshift starburs ...
... 2006; Clemens et al. 2009; Edwards & Fadda 2011). Studies of cluster galaxy populations to z . 1 find that the evolution in the color and scatter of cluster red-sequences is consistent with simple passive evolution models in which the bulk of galaxies’ stars formed in a short, high-redshift starburs ...
Candidate star clusters toward the inner Milky Way discovered on
... images from the VISTA Variables in Via Lactea (VVV) Survey. Methods. We applied an automated two-step procedure to the point-source catalog derived from the deep KS images: first, we identified overdensities of stars, and then we selected only candidate clusters with probable member stars that match ...
... images from the VISTA Variables in Via Lactea (VVV) Survey. Methods. We applied an automated two-step procedure to the point-source catalog derived from the deep KS images: first, we identified overdensities of stars, and then we selected only candidate clusters with probable member stars that match ...
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.