ppt - WISH
... Why do we want to find high-z galaxy clusters? 1. Growth of structures: the measurement of cosmological parameters. - independent of the geometric methods such as SNe distance, CMB, BAO - One of the very few ways to test GR at very large scale. 2. Galaxy evolution, cluster formation: effects of env ...
... Why do we want to find high-z galaxy clusters? 1. Growth of structures: the measurement of cosmological parameters. - independent of the geometric methods such as SNe distance, CMB, BAO - One of the very few ways to test GR at very large scale. 2. Galaxy evolution, cluster formation: effects of env ...
On the absolute age of the globular cluster M71
... of the candidate cluster stars with appropriate isochrones. We found an age of 12±2.0 Gyr, in good agreement with literature values. Beside the classical isochrone comparison, we also estimated the age by using the ’knee method’, which is independent by the uncertainties affecting the cluster distan ...
... of the candidate cluster stars with appropriate isochrones. We found an age of 12±2.0 Gyr, in good agreement with literature values. Beside the classical isochrone comparison, we also estimated the age by using the ’knee method’, which is independent by the uncertainties affecting the cluster distan ...
The Evolutionary Status of Be Stars in Clusters and in the Galactic
... in the HIPPARCOS parallax lower than 10%. In Fig. 4 we present the same MV − c0 diagram, restricted to stars with relative error lower than 10% in the HIPPARCOS parallax, in order to have a sample with more accurately determined absolute magnitudes. In this case the main sequence is significantly le ...
... in the HIPPARCOS parallax lower than 10%. In Fig. 4 we present the same MV − c0 diagram, restricted to stars with relative error lower than 10% in the HIPPARCOS parallax, in order to have a sample with more accurately determined absolute magnitudes. In this case the main sequence is significantly le ...
CONSTELLATION DELPHINUS, THE DOLPHIN
... 3.5 in December 1967 On 14 August 2013, a possible nova was discovered by amateur astronomer Koichi Itagaki, initially labelled PNV J20233073+2046041, now labelled Nova Delphini 2013. DEEP-SKY OBJECTS Because it is in a rich Milky Way star field, Delphinus has several deep-sky objects: NGC 6891 is a ...
... 3.5 in December 1967 On 14 August 2013, a possible nova was discovered by amateur astronomer Koichi Itagaki, initially labelled PNV J20233073+2046041, now labelled Nova Delphini 2013. DEEP-SKY OBJECTS Because it is in a rich Milky Way star field, Delphinus has several deep-sky objects: NGC 6891 is a ...
(Star Stuff) ( 11-9-10)
... Faster and faster Core collapses Supernova Produces all elements heavier than Fe and blows envelope apart ejecting to interstellar space most of its mass ...
... Faster and faster Core collapses Supernova Produces all elements heavier than Fe and blows envelope apart ejecting to interstellar space most of its mass ...
Stellar Populations of Galaxies- 2 Lectures H
... The shape depends on the metallicity of the stars (Demarque et al 2004) One can determine the 'age' of the system by fitting an isochrone (if one has data for individual stars) or by calculating some average property (color/spectrum) averaging over the isochrone - degeneracy problems with age and me ...
... The shape depends on the metallicity of the stars (Demarque et al 2004) One can determine the 'age' of the system by fitting an isochrone (if one has data for individual stars) or by calculating some average property (color/spectrum) averaging over the isochrone - degeneracy problems with age and me ...
The Sagittarius dwarf irregular galaxy: Metallicity and stellar
... appears to have a high mass fraction in the form of neutral gas, MHI /LB = 1.6, a value quite typical of the Hi content in dwarf irregular galaxies (see Mateo 1998). Because of its high gas content, low luminosity, and especially its claimed very low metallicity, SagDIG may be a clue to the origin a ...
... appears to have a high mass fraction in the form of neutral gas, MHI /LB = 1.6, a value quite typical of the Hi content in dwarf irregular galaxies (see Mateo 1998). Because of its high gas content, low luminosity, and especially its claimed very low metallicity, SagDIG may be a clue to the origin a ...
The Sagittarius dwarf irregular galaxy: Metallicity and stellar
... appears to have a high mass fraction in the form of neutral gas, MHI /LB = 1.6, a value quite typical of the Hi content in dwarf irregular galaxies (see Mateo 1998). Because of its high gas content, low luminosity, and especially its claimed very low metallicity, SagDIG may be a clue to the origin a ...
... appears to have a high mass fraction in the form of neutral gas, MHI /LB = 1.6, a value quite typical of the Hi content in dwarf irregular galaxies (see Mateo 1998). Because of its high gas content, low luminosity, and especially its claimed very low metallicity, SagDIG may be a clue to the origin a ...
The Sagittarius dwarf irregular galaxy
... appears to have a high mass fraction in the form of neutral gas, MHI /LB = 1.6, a value quite typical of the Hi content in dwarf irregular galaxies (see Mateo 1998). Because of its high gas content, low luminosity, and especially its claimed very low metallicity, SagDIG may be a clue to the origin a ...
... appears to have a high mass fraction in the form of neutral gas, MHI /LB = 1.6, a value quite typical of the Hi content in dwarf irregular galaxies (see Mateo 1998). Because of its high gas content, low luminosity, and especially its claimed very low metallicity, SagDIG may be a clue to the origin a ...
Explore the Galaxy - Museum of Science
... The “Identifying Solar System Patterns” activity is d esigned for sm all grou p s of 3 stu d ents, each of w hom w ill be given a role. Each grou p w ill be given a set of card s w ith d ata for each of the 8 p lanets. First, they w ill observe each p lanet and the solar system as a w hole, record i ...
... The “Identifying Solar System Patterns” activity is d esigned for sm all grou p s of 3 stu d ents, each of w hom w ill be given a role. Each grou p w ill be given a set of card s w ith d ata for each of the 8 p lanets. First, they w ill observe each p lanet and the solar system as a w hole, record i ...
The First Stars in the Universe
... of dark matter. Inside the disk, the densest clumps of gas would continue to contract, and eventually some of them would undergo a runaway collapse and become stars. The first star-forming clumps were much warmer than the molecular gas clouds in which most stars currently form. Dust grains and molec ...
... of dark matter. Inside the disk, the densest clumps of gas would continue to contract, and eventually some of them would undergo a runaway collapse and become stars. The first star-forming clumps were much warmer than the molecular gas clouds in which most stars currently form. Dust grains and molec ...
www.esf.org - European Science Foundation
... for more than one billion stars throughout most of the Milky Way galaxy. Gaia builds on the expertise in astrometry established in Europe through the successful Hipparcos mission. This satellite produced a reference catalogue (published in 1997) of some 120 000 stars with an astrometric accuracy of ...
... for more than one billion stars throughout most of the Milky Way galaxy. Gaia builds on the expertise in astrometry established in Europe through the successful Hipparcos mission. This satellite produced a reference catalogue (published in 1997) of some 120 000 stars with an astrometric accuracy of ...
Metallicity, Age, and Mass of Star Forming Galaxies at z~3
... Qualitatively supports hierarchical galaxy formation. LSB galaxies and bursting dwarf galaxies don’t dominate the ...
... Qualitatively supports hierarchical galaxy formation. LSB galaxies and bursting dwarf galaxies don’t dominate the ...
December - Rose City Astronomers
... scanty star grouping of DolidzeDžimšelejšvili 1 (Do-Dž 1). This triple star and open cluster combo is a remarkable stroke of cosmic serendipity in an area nearly devoid of other major deep-sky objects. The refractor at 44x shows the 12' diameter star cluster as six stars (9th to 11thmagnitude) embed ...
... scanty star grouping of DolidzeDžimšelejšvili 1 (Do-Dž 1). This triple star and open cluster combo is a remarkable stroke of cosmic serendipity in an area nearly devoid of other major deep-sky objects. The refractor at 44x shows the 12' diameter star cluster as six stars (9th to 11thmagnitude) embed ...
28.3 Doppler Shift
... star moving away from or toward Earth? One of the spectral lines for a star has shifted from 560 nm to 544 nm. What is the speed of the star? Is it moving away from or toward Earth? An astronomer has determined that two galaxies are moving away from Earth. A spectral line for galaxy A is red shifted ...
... star moving away from or toward Earth? One of the spectral lines for a star has shifted from 560 nm to 544 nm. What is the speed of the star? Is it moving away from or toward Earth? An astronomer has determined that two galaxies are moving away from Earth. A spectral line for galaxy A is red shifted ...
How do stars orbit in our galaxy?
... • How does our galaxy recycle gas into stars? • Stars are born from the gravitational collapse of gas clumps in molecular clouds. Near the ends of their lives, stars more massive than our Sun create elements heavier than hydrogen and helium and expel them into space via supernovae and stellar winds. ...
... • How does our galaxy recycle gas into stars? • Stars are born from the gravitational collapse of gas clumps in molecular clouds. Near the ends of their lives, stars more massive than our Sun create elements heavier than hydrogen and helium and expel them into space via supernovae and stellar winds. ...
Unit 13―The “Fixed” Stars
... use lots of exponents. A student of math might have guessed that when we flagged a linear range to be compared with a multiplicative range, that would involve the use of logarithms. Take the logarithm of both sides of the equations and they look much simpler―the final equation from the original stud ...
... use lots of exponents. A student of math might have guessed that when we flagged a linear range to be compared with a multiplicative range, that would involve the use of logarithms. Take the logarithm of both sides of the equations and they look much simpler―the final equation from the original stud ...
Power Point of Slides of First lecture
... [email protected] Office hours: Thursdays 4:00-5:00 For help with Cepheid variable lab, ...
... [email protected] Office hours: Thursdays 4:00-5:00 For help with Cepheid variable lab, ...
class 2, S11
... —No, the observable portion of the universe is about 14 billion light-years in radius because the universe is about 14 billion years old. ALSO (not in Ch. 1 of the book), we can “see” only about 4% of the universe, 96% is made of “dark matter” and “dark energy”. ...
... —No, the observable portion of the universe is about 14 billion light-years in radius because the universe is about 14 billion years old. ALSO (not in Ch. 1 of the book), we can “see” only about 4% of the universe, 96% is made of “dark matter” and “dark energy”. ...
eventful-szkody
... ‘fog’ for other transients • flaring rate depends on flare energy, spectral type, stellar age, line of sight • model can be used to ‘observe’ the Galaxy and predict the number of flares seen as optical transients, although several parameters are not yet well-measured. • hundreds of hours of new obse ...
... ‘fog’ for other transients • flaring rate depends on flare energy, spectral type, stellar age, line of sight • model can be used to ‘observe’ the Galaxy and predict the number of flares seen as optical transients, although several parameters are not yet well-measured. • hundreds of hours of new obse ...
Can Gravity Explain the Pioneer 10-11 Anomaly
... cosmological data. The theory has an extra degree of freedom, a vector field called a “phion” field whose curl is a skew field that couples to matter (“fifth force”). The gravitational field is described by a symmetric Einstein metric tensor. • The effective classical theory allows the gravitational ...
... cosmological data. The theory has an extra degree of freedom, a vector field called a “phion” field whose curl is a skew field that couples to matter (“fifth force”). The gravitational field is described by a symmetric Einstein metric tensor. • The effective classical theory allows the gravitational ...
Transit of Luyten 726-8 within 1 ly from Epsilon Eridani
... Kuiper belt starting at 35 AU from the star. It should also have the outer cloud of long-period comets more massive than the Oort cloud in our solar system. The litterature on ε Eri is very extensive, cf. 1159 references currently available in SIMBAD database for additional details. BL/UV Ceti was d ...
... Kuiper belt starting at 35 AU from the star. It should also have the outer cloud of long-period comets more massive than the Oort cloud in our solar system. The litterature on ε Eri is very extensive, cf. 1159 references currently available in SIMBAD database for additional details. BL/UV Ceti was d ...
Measuring the Stars Section 29.2
... Basic Properties of Stars Magnitude The classification of stars by absolute magnitude allows comparisons that are based on how bright the stars would appear at equal distances from an observer. The disadvantage of absolute magnitude is that it can be calculated only when the actual distance to a sta ...
... Basic Properties of Stars Magnitude The classification of stars by absolute magnitude allows comparisons that are based on how bright the stars would appear at equal distances from an observer. The disadvantage of absolute magnitude is that it can be calculated only when the actual distance to a sta ...
Iron in Stars
... exploding in a supernova. For stars in the mass range of 130 solar masses, this would result in a supernova for which is predicted a large proportion of the heavy elements created would take the form of iron. Population III stars have not been observed yet. This is due to the extremely short lifetim ...
... exploding in a supernova. For stars in the mass range of 130 solar masses, this would result in a supernova for which is predicted a large proportion of the heavy elements created would take the form of iron. Population III stars have not been observed yet. This is due to the extremely short lifetim ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.