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Jul y 9- 11,
Jul y 9- 11,

... The grand-design spiral galaxy NGC 6946 is remarkable due to its high star formation activity, its massive northern spiral arm and the “magnetic arms,” visible in radio continuum polarization and located between the optical arms. Strong Faraday depolarization of the polarized radio emission from the ...
Red supergiants and the past of Cygnus OB2
Red supergiants and the past of Cygnus OB2

... main star-forming sites have been shifting with time. The study of this older component is made difficult by the effects of stellar evolution, and in particular by the fact that its most massive components have already disappeared as supernovae. A thus far unexplored probe of the massive star format ...
Surface  Gravity  as  a  Diagnostic ... Youth Cameron Higby-Naquin Advisor:  Eric  Jensen
Surface Gravity as a Diagnostic ... Youth Cameron Higby-Naquin Advisor: Eric Jensen

... Knowing the age of a star is only the first step to understanding stellar evolution and completely describing how stars change with time. In short, different stars take different amounts of time to form, and to fully grasp the formation process, physical properties of the star must be determined. A ...
Final Stages of Stellar Evolution - supernovae and the synthesis of
Final Stages of Stellar Evolution - supernovae and the synthesis of

... supermassive black holes in center of most galaxies → collapse of dense cluster of stars large amouts of mass accreting onto stellar “seed” black hole fusion of smaller black holes masses up to 109 · M ...
Light on Dark Matter with Weak Gravitational Lensing
Light on Dark Matter with Weak Gravitational Lensing

... In the beginning of the twentieth century, A. Einstein predicted that massive bodies could be seen as gravitational lenses that bend the path of light rays by creating a local curvature in space-time. One of the first confirmations of Einstein’s new theory was the observation during the 1919 eclipse ...
Article PDF - IOPscience
Article PDF - IOPscience

Infrared Properties of Star-Forming Dwarf Galaxies. I. Dwarf Irregular
Infrared Properties of Star-Forming Dwarf Galaxies. I. Dwarf Irregular

... dwarfs.’’ BCDs include gas, stars, and usually starburst regions, all of which are centrally concentrated. Due to their pronounced compact starbursts, BCDs have higher surface brightnesses (B  22 mag arcsec2). Like dIs, BCDs are also metal-poor, with Z as low as 1/50 Z, showing a trend of redder ...
The Origin and Evolution of Dust in Galaxies
The Origin and Evolution of Dust in Galaxies

...  Bridging local group galaxies to high-z galaxies ...
A Map of the Universe
A Map of the Universe

... picture, at a scale of 1/108 , shows the entire Earth. The 14th picture, at a scale of 1/1014 , shows the entire Solar system. The 18th picture, at a scale of 1/1018 , includes α Centauri, The 22nd picture, at a scale of 1/1022 shows all of the Milky Way Galaxy. The 26th and last picture in the sequ ...
Finding Dark Matter
Finding Dark Matter

... • Developed computational tools and protocols for analyzing many GBs of nightly CTIO observations in almost real time to pick out interesting events and prioritize them for followup observation – Follow-up is time critical because events are only active for a few weeks ...
The Milky Way as a galaxy
The Milky Way as a galaxy

... at the location of the Sun (see Fig. 2.2). The Galactic plane is the plane of the Galactic disk, i.e., it is parallel to the band of the Milky Way. The two Galactic coordinates ` and b are angular coordinates on the sphere. Here, b denotes the Galactic latitude, the angular distance of a source from ...
XXII. Low-efficiency star formation in early-type galaxies
XXII. Low-efficiency star formation in early-type galaxies

... with H I masses from 107 to a few 109 M . More relevant for star formation, molecular gas is detected in 22 per cent of ETGs, with an average molecular gas-to-star mass fraction of a few per cent (1– 5 per cent, Young et al. 2011, hereafter Paper IV), similar to what is found in some spirals. These ...
Discovery of extremely lead-rich subdwarfs: does heavy metal signal
Discovery of extremely lead-rich subdwarfs: does heavy metal signal

... Hot subdwarfs represent a group of low-mass helium-burning stars formed through binarystar interactions and include some of the most chemically peculiar stars in the Galaxy. Stellar evolution theory suggests that they should have helium-rich atmospheres but, because radiation causes hydrogen to diff ...
GammaRay Bursts, the Strongest Explosions in the Universe.
GammaRay Bursts, the Strongest Explosions in the Universe.

... Gregory  Chibisov6  suggested  that  GRBs  could  be  extra  galactic,  making  them much more powerful than if they  were  produced  by  relativity  “local”  Galactic  objects.  Note  that  a  source  at  distant  galaxy  is  million  times  further  than a source in our own Galaxy. This  would  ma ...
R585 EXPLORERS OF THE SOUTHERN SKY
R585 EXPLORERS OF THE SOUTHERN SKY

... Basic design theory and its historical development Published by Springer Verlag - Astronomy & Astrophysics Library Series - author : Raymond N. Wilson - 1996 - DM 128,00/öS 934,40/sFr 113,00 (hardcover) - ISBN 3 540 58964 3 - number of pages : 546 Telescope Design and Construction - advanced amateur ...
AUGUSTE COMTE`S BLUNDER: AN ACCOUNT OF THE FIRST
AUGUSTE COMTE`S BLUNDER: AN ACCOUNT OF THE FIRST

Article PDF - IOPscience
Article PDF - IOPscience

... galaxies come in several types such that the relationship between bulge and disk light may not be as simple as these model fitting techniques assume. It is also not clear that bulges are well fitted by the de Vaucouleurs profile, with significant evidence that they are not (Andredakis & Sanders 1994; Ma ...
Rotation Periods and Relative Ages of Solar-Type Stars
Rotation Periods and Relative Ages of Solar-Type Stars

... Isochrones are theoretical plots of various-aged stars on axes of log Teff (effective temperature) and δMbol (bolometric luminosity). Also, Ca II H (396.8 nm) and K (383.4 nm) chromospheric emissions are empirically linked to ages (Soderblom et al. 1991). By fitting Strömgren uvby-Hβ photometry data ...
CPW Science Passage
CPW Science Passage

1. The Birth of a Star
1. The Birth of a Star

... press the [C] key once. This will instruct your ship to swing and point its nose (the bow) directly toward a faint colored cloud in space named “M42”. Notice that in the same info display, the distance from you to that cloud is listed as 1,177.7 ly. The “ly” stands for “Light Year”. It is not a time ...
Behaviour of elements from lithium to europium in stars with and
Behaviour of elements from lithium to europium in stars with and

... online ELODIE reduction software, while the order deblazing and the cosmic, telluric lines and bad pixel removal were performed following the recipes described in Katz et al. (1998). Further treatment of spectra (the continuous spectrum level placement, measurement of the equivalent widths etc.) was ...
Hands-On Activities
Hands-On Activities

... Roman god of war (the counterpart of the Greek Ares), on account of its blood red color as viewed in the night sky. Mercury: The innermost and smallest planet in the solar system (since Pluto was re-labeled as a dwarf planet), orbiting the Sun once every 88 days. meteor: The visible event that occur ...
LIGO SURF 2006 Lecture 1 - Indico
LIGO SURF 2006 Lecture 1 - Indico

... (at speeds close to c), eg, because it’s orbiting a companion, the “news” of the changing gravitational field propagates outward as gravitational radiation – a wave of spacetime curvature AJW, CERN, Aug 11, 2006 ...
Masses of Dwarf Satellites of the Milky Way
Masses of Dwarf Satellites of the Milky Way

... Here, Lgal and LMW are the individual probability distributions of Segue 1 and the Milky Way galaxies parameterized by the set Mgal,MW . The metallicity distribution of the member and nonmember stars are each modeled by Gaussians with mean metallicities w̄gal , w̄MW and widths σw,gal , σw,MW respect ...
Neutron Star and Superfluidity
Neutron Star and Superfluidity

... copper pairs due to the long-range attractive nuclear force and lead to superfluidity and superconductivity[2, 3]. In this paper, I will only focus on nucleon superfluidity and left behind other possible interesting microphysics that may also take place inside neutron stars, including superconductivit ...
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Future of an expanding universe

Observations suggest that the expansion of the universe will continue forever. If so, the universe will cool as it expands, eventually becoming too cold to sustain life. For this reason, this future scenario is popularly called the Big Freeze.If dark energy—represented by the cosmological constant, a constant energy density filling space homogeneously, or scalar fields, such as quintessence or moduli, dynamic quantities whose energy density can vary in time and space—accelerates the expansion of the universe, then the space between clusters of galaxies will grow at an increasing rate. Redshift will stretch ancient, incoming photons (even gamma rays) to undetectably long wavelengths and low energies. Stars are expected to form normally for 1012 to 1014 (1–100 trillion) years, but eventually the supply of gas needed for star formation will be exhausted. And as existing stars run out of fuel and cease to shine, the universe will slowly and inexorably grow darker, one star at a time. According to theories that predict proton decay, the stellar remnants left behind will disappear, leaving behind only black holes, which themselves eventually disappear as they emit Hawking radiation. Ultimately, if the universe reaches a state in which the temperature approaches a uniform value, no further work will be possible, resulting in a final heat death of the universe.
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