arXiv:astro-ph/0508448v1 22 Aug 2005
... two binaries could produce the currently observed configuration. Hoogerwerf et al. (2001) investigated the origin of twenty-two nearby runaway stars. Parent associations were proposed for sixteen of these stars. Of these sixteen eleven were proposed to have been produced via the binary supernova sce ...
... two binaries could produce the currently observed configuration. Hoogerwerf et al. (2001) investigated the origin of twenty-two nearby runaway stars. Parent associations were proposed for sixteen of these stars. Of these sixteen eleven were proposed to have been produced via the binary supernova sce ...
– 1 – 1. Emission Lines in Nearby Galaxies 1.1.
... To determine the ionization levels of the various elements, one needs to know the electron temperature. The strength of forbidden lines is easy to calculate since they are almost always optically thin in HII regions and the density is low, so collisional de-excitation can be ignored. This results in ...
... To determine the ionization levels of the various elements, one needs to know the electron temperature. The strength of forbidden lines is easy to calculate since they are almost always optically thin in HII regions and the density is low, so collisional de-excitation can be ignored. This results in ...
The Swift satellite lives up to its name, revealing cosmic
... prompt phase the canonical afterglow decays very steeply before flattening out to what is known as a plateau phase. The light curve then breaks to the steeper decay rate known from pre-Swift data and may steepen again at a day or so after the GRB began indicating the sideways spreading of the jet as ...
... prompt phase the canonical afterglow decays very steeply before flattening out to what is known as a plateau phase. The light curve then breaks to the steeper decay rate known from pre-Swift data and may steepen again at a day or so after the GRB began indicating the sideways spreading of the jet as ...
Bluffer`s Guide to Sirius
... tugged by the gravitational pull of another object, so there was something else orbiting Sirius, too faint to be seen. However, telescopes were increasing in size and in 1862 the companion was seen for the first time. This odd little star is Sirius B (sometimes Sirius ‘proper’ is called Sirius A) or ...
... tugged by the gravitational pull of another object, so there was something else orbiting Sirius, too faint to be seen. However, telescopes were increasing in size and in 1862 the companion was seen for the first time. This odd little star is Sirius B (sometimes Sirius ‘proper’ is called Sirius A) or ...
Can we account for the dust
... Mid- and far-IR emission of galaxies ◦ Thermal emission from dust grains ...
... Mid- and far-IR emission of galaxies ◦ Thermal emission from dust grains ...
Molecular Gas in Galactic Environments Abstracts (Poster)
... Formaldehyde in Absorption: Tracing Molecular Gas in Early-Type Galaxies Early-Type Galaxies (ETGs) have been long-classified as the red, ellipsoidal branch of the classic Hubble tuning fork diagram of galactic structure. In part with this classification, ETGs are thought to be molecular and atomic ...
... Formaldehyde in Absorption: Tracing Molecular Gas in Early-Type Galaxies Early-Type Galaxies (ETGs) have been long-classified as the red, ellipsoidal branch of the classic Hubble tuning fork diagram of galactic structure. In part with this classification, ETGs are thought to be molecular and atomic ...
Sample pages 1 PDF
... silicates. Due to the obscuring nature of such dust, much current research is done in the infrared, and there is excellent correlation between infrared and optical spectroscopy on AGB stars. Any one of these spectral signatures is of interest to astronomers researching the production and evolution o ...
... silicates. Due to the obscuring nature of such dust, much current research is done in the infrared, and there is excellent correlation between infrared and optical spectroscopy on AGB stars. Any one of these spectral signatures is of interest to astronomers researching the production and evolution o ...
Cosmic variance in [O/Fe] in the Galactic disk
... Galactic Evolution Experiment (APOGEE) provides such data. We present oxygen abundances from OH lines in the H band (1.5–1.7 µm) for disk stars over a wide range of distances observed by APOGEE, which is part of the Sloan Digital Sky Survey (SDSS). We overcome systematic effects by considering subsa ...
... Galactic Evolution Experiment (APOGEE) provides such data. We present oxygen abundances from OH lines in the H band (1.5–1.7 µm) for disk stars over a wide range of distances observed by APOGEE, which is part of the Sloan Digital Sky Survey (SDSS). We overcome systematic effects by considering subsa ...
Confirmation of Hostless Type Ia Supernovae Using Hubble Space
... We present deep Hubble Space Telescope imaging at the locations of four, potentially hostless, long-faded Type Ia supernovae (SNe Ia) in low-redshift, rich galaxy clusters that were identified in the Multi-Epoch Nearby Cluster Survey. Assuming a steep faint-end slope for the galaxy cluster luminosit ...
... We present deep Hubble Space Telescope imaging at the locations of four, potentially hostless, long-faded Type Ia supernovae (SNe Ia) in low-redshift, rich galaxy clusters that were identified in the Multi-Epoch Nearby Cluster Survey. Assuming a steep faint-end slope for the galaxy cluster luminosit ...
The Milky Way thin disk structure as revealed by stars and young
... when seen face-off, possess dusty and gaseous disks where stars are barely visible. On the other hand, when seen face-on, they exhibit quite spectacular structures in the form of gaseous and stellar spiral arms, bridges, inter-arm structures, knots, bifurcations, and so forth. These detailed shapes a ...
... when seen face-off, possess dusty and gaseous disks where stars are barely visible. On the other hand, when seen face-on, they exhibit quite spectacular structures in the form of gaseous and stellar spiral arms, bridges, inter-arm structures, knots, bifurcations, and so forth. These detailed shapes a ...
Module 11.1.1: Galaxies: Morphology and the Hubble Sequence
... universe now, and their masses range from hundreds of million to maybe trillion solar masses, containing up to couple of hundred billion stars. [slide 3] The first thing that any empirical ...
... universe now, and their masses range from hundreds of million to maybe trillion solar masses, containing up to couple of hundred billion stars. [slide 3] The first thing that any empirical ...
13.1 Galaxy Evolution: Introduction
... of expressing star-formation histories is as an exponentially declining rate, which is probably not a bad overall assumption, averaged over many galaxies. In this case, for early-type galaxies, there is a lot of star formation early on - the exponential very steep. For this galaxy, i ...
... of expressing star-formation histories is as an exponentially declining rate, which is probably not a bad overall assumption, averaged over many galaxies. In this case, for early-type galaxies, there is a lot of star formation early on - the exponential very steep. For this galaxy, i ...
M81/M82/NGC3077
... (CBR value: 48 km/sec) M82 — 202 km/sec (3.9 ± 0.3 Mpc) (CBR value: 296 km/sec) M81 is closer and approaching, while M82 is farther away and receding; ...
... (CBR value: 48 km/sec) M82 — 202 km/sec (3.9 ± 0.3 Mpc) (CBR value: 296 km/sec) M81 is closer and approaching, while M82 is farther away and receding; ...
Unravelling the Origin and Evolution of Our Galaxy
... than our Sun. These are all within a distance of about 100 light-years. The planets detectable by this method are rather massive, comparable to Jupiter (which has about 300 times the mass of Earth). The systems have some surprising properties: two thirds of these giant planets are orbiting their hos ...
... than our Sun. These are all within a distance of about 100 light-years. The planets detectable by this method are rather massive, comparable to Jupiter (which has about 300 times the mass of Earth). The systems have some surprising properties: two thirds of these giant planets are orbiting their hos ...
Precision age indicators that exploit chemically peculiar stars
... still of great value, blue photometric colors generally indicate galaxies with ongoing star formation, while red colors indicate galaxies that have not formed significant numbers of stars in the last few hundred million years. A technique that often gives higher precision is using Balmer feature str ...
... still of great value, blue photometric colors generally indicate galaxies with ongoing star formation, while red colors indicate galaxies that have not formed significant numbers of stars in the last few hundred million years. A technique that often gives higher precision is using Balmer feature str ...
Living Things - Fairfield-Suisun Unified School District
... most massive stars collapse into black holes. Here, a black hole is shown pulling matter from a companion star. ...
... most massive stars collapse into black holes. Here, a black hole is shown pulling matter from a companion star. ...
POSTERS SESSION I: Atmospheres of Massive Stars
... Massive stars have strong stellar winds that exhibit variability on timescales ranging from hours to years. Many classes of these stars are also seen, via photometric or line-profile variability, to pulsate radially or nonradially. It has been suspected for some time that these oscillations can indu ...
... Massive stars have strong stellar winds that exhibit variability on timescales ranging from hours to years. Many classes of these stars are also seen, via photometric or line-profile variability, to pulsate radially or nonradially. It has been suspected for some time that these oscillations can indu ...
15.1 Introduction
... and UV spectra are dominated by strong, broad emission lines instead of the narrow absorption lines that are typical of ‘normal’ stars (Figure 15.3). The emission lines are so strong that they were first noticed as early as 1867 by... Charles Wolf and Georges Rayet (!) using the 40 cm Foucault teles ...
... and UV spectra are dominated by strong, broad emission lines instead of the narrow absorption lines that are typical of ‘normal’ stars (Figure 15.3). The emission lines are so strong that they were first noticed as early as 1867 by... Charles Wolf and Georges Rayet (!) using the 40 cm Foucault teles ...
classifying stars
... Alpha Centuri A (yellow, middle brightness) Altair (white, middle brightness) Arcturus (red-orange, middle-high brightness) Betelgeuse (red, high brightness) Capella (yellow, middle-high brightness) Epsilon Eridani (red-orange, middle-low brightness) Mizar (white, middle-high brightness) Procyon B ( ...
... Alpha Centuri A (yellow, middle brightness) Altair (white, middle brightness) Arcturus (red-orange, middle-high brightness) Betelgeuse (red, high brightness) Capella (yellow, middle-high brightness) Epsilon Eridani (red-orange, middle-low brightness) Mizar (white, middle-high brightness) Procyon B ( ...
2. The Anatomy of Stellar Life and Death
... with a very similar scaling of the mass of protostars. The observations were done in the millimeter (microwave) range where the dusty material comprising the nebula is transparent. This allowed detailed observations of the internal structure of the nebula. Beuther’s and Schilke’s work revealed a neb ...
... with a very similar scaling of the mass of protostars. The observations were done in the millimeter (microwave) range where the dusty material comprising the nebula is transparent. This allowed detailed observations of the internal structure of the nebula. Beuther’s and Schilke’s work revealed a neb ...
1 - Piscataway High School
... of the gas would weigh more than an automobile. In this degenerate matter, the pressure does not depend on temperature, and that means the pressure–temperature thermostat does not regulate energy production. When the temperature becomes hot enough, helium fusion begins to make energy, and the temper ...
... of the gas would weigh more than an automobile. In this degenerate matter, the pressure does not depend on temperature, and that means the pressure–temperature thermostat does not regulate energy production. When the temperature becomes hot enough, helium fusion begins to make energy, and the temper ...
Statistical analysis of stellar evolution
... simplifies statistical analysis because we expect the stars to have nearly the same metallicity, age, and distance; only their masses differ. Unfortunately, the data are contaminated with stars that are in the same line of sight as the cluster but are not part of the cluster. These stars appear to b ...
... simplifies statistical analysis because we expect the stars to have nearly the same metallicity, age, and distance; only their masses differ. Unfortunately, the data are contaminated with stars that are in the same line of sight as the cluster but are not part of the cluster. These stars appear to b ...
Lab 14 Galaxy Morphology
... Other spiral galaxies, like M51 shown in Fig. 14.4, have less tightly wound spiral arms, and much smaller bulges. Finally, there are spiral galaxies with very tightly wound spiral arms that are dominated by their bulge, like the Andromeda galaxy (M31) shown in Fig. 14.5. The arms are so tightly woun ...
... Other spiral galaxies, like M51 shown in Fig. 14.4, have less tightly wound spiral arms, and much smaller bulges. Finally, there are spiral galaxies with very tightly wound spiral arms that are dominated by their bulge, like the Andromeda galaxy (M31) shown in Fig. 14.5. The arms are so tightly woun ...
3. Cosmology and the Origin and Evolution of Galaxies
... with more confidence. The redshift-distribution determined from the radio-FIR photometric-colors and spectroscopic observations indicates that more than 60% of the brightest mm galaxies lie between redshifts z =1.8 - 3.58,9. If we take into account the small fraction (< 10%) of the sub-mm background ...
... with more confidence. The redshift-distribution determined from the radio-FIR photometric-colors and spectroscopic observations indicates that more than 60% of the brightest mm galaxies lie between redshifts z =1.8 - 3.58,9. If we take into account the small fraction (< 10%) of the sub-mm background ...
The National Centre for Radio Astrophysics
... These are galaxies where extremely energetic phenomena take place, driven by activity around the supermassive black holes at their centres. These result in the emission of enormous amounts of radiation in various wavebands, including the radio, making them observable out to very large distances in t ...
... These are galaxies where extremely energetic phenomena take place, driven by activity around the supermassive black holes at their centres. These result in the emission of enormous amounts of radiation in various wavebands, including the radio, making them observable out to very large distances in t ...
Serpens
Serpens (""the Serpent"", Greek Ὄφις) is a constellation of the northern hemisphere. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. It is unique among the modern constellations in being split into two non-contiguous parts, Serpens Caput (Serpent's Head) to the west and Serpens Cauda (Serpent's Tail) to the east. Between these two halves lies the constellation of Ophiuchus, the ""Serpent-Bearer"". In figurative representations, the body of the serpent is represented as passing behind Ophiuchus between Mu Serpentis in Serpens Caput and Nu Serpentis in Serpens Cauda.The brightest star in Serpens is the red giant star Alpha Serpentis, or Unukalhai, in Serpens Caput, with an apparent magnitude of 2.63. Also located in Serpens Caput are the naked-eye globular cluster Messier 5 and the naked-eye variables R Serpentis and Tau4 Serpentis. Notable extragalactic objects include Seyfert's Sextet, one of the densest galaxy clusters known; Arp 220, the prototypical ultraluminous infrared galaxy; and Hoag's Object, the most famous of the very rare class of galaxies known as ring galaxies.Part of the Milky Way's galactic plane passes through Serpens Cauda, which is therefore rich in galactic deep-sky objects, such as the Eagle Nebula (IC 4703) and its associated star cluster Messier 16. The nebula measures 70 light-years by 50 light-years and contains the Pillars of Creation, three dust clouds that became famous for the image taken by the Hubble Space Telescope. Other striking objects include the Red Square Nebula, one of the few objects in astronomy to take on a square shape; and Westerhout 40, a massive nearby star-forming region consisting of a molecular cloud and an H II region.