IAC_L5_bulge_GALAH
... The disk took ~ 2 Gyr to evolve chemically and dynamically before going unstable and buckling into the peanut structure, so the components A-E are trapped relics of the Galactic disk and halo from that time. The instability process generated a mapping of the stars of the early disk into the boxy/pea ...
... The disk took ~ 2 Gyr to evolve chemically and dynamically before going unstable and buckling into the peanut structure, so the components A-E are trapped relics of the Galactic disk and halo from that time. The instability process generated a mapping of the stars of the early disk into the boxy/pea ...
Astronomy Astrophysics Circumstellar emission in Be/X-ray binaries of the Magellanic
... Aims. We study the optical and near-infrared colour excesses produced by circumstellar emission in a sample of Be/X-ray binaries. Our main goals are exploring whether previously published relations, valid for isolated Be stars, are applicable to Be/X-ray binaries and computing the distance to these ...
... Aims. We study the optical and near-infrared colour excesses produced by circumstellar emission in a sample of Be/X-ray binaries. Our main goals are exploring whether previously published relations, valid for isolated Be stars, are applicable to Be/X-ray binaries and computing the distance to these ...
Chapter 16
... • Galaxy masses can be determined by rotation curves and galaxy clusters. • All measures show that a large amount of dark matter must exist. • Large galaxies probably formed from the merger of smaller ones. • Collisions are also important. • Merger of spiral galaxies probably results in an elliptica ...
... • Galaxy masses can be determined by rotation curves and galaxy clusters. • All measures show that a large amount of dark matter must exist. • Large galaxies probably formed from the merger of smaller ones. • Collisions are also important. • Merger of spiral galaxies probably results in an elliptica ...
Astronomy
... (8) Earth and space. The student knows characteristics of the universe. The student is expected to: (A) describe components of the universe, including stars, nebulae, and galaxies, and use models such as the Herztsprung-Russell diagram for classification; (B) recognize that the Sun is a medium-sized ...
... (8) Earth and space. The student knows characteristics of the universe. The student is expected to: (A) describe components of the universe, including stars, nebulae, and galaxies, and use models such as the Herztsprung-Russell diagram for classification; (B) recognize that the Sun is a medium-sized ...
Document
... minimum at R≈ 1 Kpc and then rises until it reaches a second maximum at R ≈ 4-10 Kpc . For R grater than the optical one rotation curves are extremely regular (no more fluctuations are detected). The most important feature is that here RC’s are FLAT θ(R)≈ constant.( The image of Andromeda in the ...
... minimum at R≈ 1 Kpc and then rises until it reaches a second maximum at R ≈ 4-10 Kpc . For R grater than the optical one rotation curves are extremely regular (no more fluctuations are detected). The most important feature is that here RC’s are FLAT θ(R)≈ constant.( The image of Andromeda in the ...
What We Might Learn from Gravitational Waves
... Short/hard Gamma-ray burst GRBs definitely exist ~1/day in the Universe GRBs are very bright/relativistic GRBs can be detected “all sky” throughout the Universe GRBs have been observed “nearby” Some long, and some short (2 second divide) ...
... Short/hard Gamma-ray burst GRBs definitely exist ~1/day in the Universe GRBs are very bright/relativistic GRBs can be detected “all sky” throughout the Universe GRBs have been observed “nearby” Some long, and some short (2 second divide) ...
Precision timing of PSR J0437-4715: an accurate pulsar distance, a
... 1996) that a distance measurement independent of parallax would be available within a decade, when the orbital period derivative (P˙b ) would be determined to high accuracy. Even if the predicted precision of ∼1% would not be achieved, such a measurement would be significant given the strong depende ...
... 1996) that a distance measurement independent of parallax would be available within a decade, when the orbital period derivative (P˙b ) would be determined to high accuracy. Even if the predicted precision of ∼1% would not be achieved, such a measurement would be significant given the strong depende ...
Lecture01-ASTA01 - University of Toronto
... Proxima Centauri takes 4.2 years to reach us. 4.3 ly from us is a companion Alpha Cen B. An Earth-mass planet was discovered 1yr ago around it! ...
... Proxima Centauri takes 4.2 years to reach us. 4.3 ly from us is a companion Alpha Cen B. An Earth-mass planet was discovered 1yr ago around it! ...
Dark Matter in the Universe
... lose: the Milky Way will merge into the more massive M31. the astronomical jury is still out as to exactly what constitutes Computer models predict that in about four billion years the dark matter. In fact, one could say we are still at an early stage galactic pair will become one spheroidal galaxy. ...
... lose: the Milky Way will merge into the more massive M31. the astronomical jury is still out as to exactly what constitutes Computer models predict that in about four billion years the dark matter. In fact, one could say we are still at an early stage galactic pair will become one spheroidal galaxy. ...
The age of elliptical galaxies and bulges in a merger model The age
... past. Likewise, analyses of the stellar ages of elliptical galaxies using absorption-line index strengths show that the outer parts of elliptical galaxies are both older and more metal-poor than the nuclei, consistent with the merger/starburst picture (Faber et al. 1995). The fact remains, however, ...
... past. Likewise, analyses of the stellar ages of elliptical galaxies using absorption-line index strengths show that the outer parts of elliptical galaxies are both older and more metal-poor than the nuclei, consistent with the merger/starburst picture (Faber et al. 1995). The fact remains, however, ...
Document
... distances to Galactic SNRs identified only in radio continuum • Necessary for confirmation of the theory in order to define valid evolutionary tracks ...
... distances to Galactic SNRs identified only in radio continuum • Necessary for confirmation of the theory in order to define valid evolutionary tracks ...
Finnish Centre for Astronomy with ESO
... They were able to detect the host galaxy in more than 3/4 of the quasars and found that quasar hosts are preferentially very luminous galaxies. The morphology of the host galaxies turned out to be more complex than found in previous studies. Quasars are hosted in a variety of galaxies, from pure ell ...
... They were able to detect the host galaxy in more than 3/4 of the quasars and found that quasar hosts are preferentially very luminous galaxies. The morphology of the host galaxies turned out to be more complex than found in previous studies. Quasars are hosted in a variety of galaxies, from pure ell ...
Celestial Navigation
... Our 'beaming' operations are not just one-way; they're not all down to Earth. We can, with a further stretch of the imagination, transport anything from Earth, upward, on to the celestial sphere. Start from the Earth's centre and from there trace a line through the top of your mast and exten,d it ri ...
... Our 'beaming' operations are not just one-way; they're not all down to Earth. We can, with a further stretch of the imagination, transport anything from Earth, upward, on to the celestial sphere. Start from the Earth's centre and from there trace a line through the top of your mast and exten,d it ri ...
Possibility of Existence of Two Planets Between Mars and Jupiter
... motion laws; also outside of solar system many planets have been discovered [2, 3, 4, 5] and the asteroids are being studied [10]. The planets distances from closest and farthest to Sun and their rotation period around Sun are also indicated in our solar system. Looking at the planets distance numbe ...
... motion laws; also outside of solar system many planets have been discovered [2, 3, 4, 5] and the asteroids are being studied [10]. The planets distances from closest and farthest to Sun and their rotation period around Sun are also indicated in our solar system. Looking at the planets distance numbe ...
Discovering X-ray Bright Neutron Stars for Current and Next-Generation
... – No binary companions – No supernova remnant ...
... – No binary companions – No supernova remnant ...
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 ...
SPIRAL STRUCTURE IN THE OUTER GALACTIC
... parameters. In the case of very young clusters, they are normally close to the Galactic plane where interstellar absorption and crowded stellar fields make membership assignments of faint stars difficult. Yet they contain massive (i.e., hot) stars that can be used to derive their parameters. The cla ...
... parameters. In the case of very young clusters, they are normally close to the Galactic plane where interstellar absorption and crowded stellar fields make membership assignments of faint stars difficult. Yet they contain massive (i.e., hot) stars that can be used to derive their parameters. The cla ...
Jeremy Heyl et al. (PDF document)
... 40% of its mass, going from 0.9 to 0.53 solar masses. It is these young WDs that are the focus of this paper. Although the core of 47 Tuc has been the focus of numerous previous investigations (e.g., McLaughlin et al. 2006; Knigge et al. 2008; Bergbusch & Stetson 2009), this is the first paper that c ...
... 40% of its mass, going from 0.9 to 0.53 solar masses. It is these young WDs that are the focus of this paper. Although the core of 47 Tuc has been the focus of numerous previous investigations (e.g., McLaughlin et al. 2006; Knigge et al. 2008; Bergbusch & Stetson 2009), this is the first paper that c ...
Nature paper - University of Southampton
... Two types of supernova are thought to produce the overwhelming majority of neutron stars in the Universe1. The first type, iron-corecollapse supernovae, occurs when a high-mass star develops a degenerate iron core that exceeds the Chandrasekhar limit2. The second type, electron-capture supernovae, i ...
... Two types of supernova are thought to produce the overwhelming majority of neutron stars in the Universe1. The first type, iron-corecollapse supernovae, occurs when a high-mass star develops a degenerate iron core that exceeds the Chandrasekhar limit2. The second type, electron-capture supernovae, i ...
Stellar Spectra Classification
... Introduction: Classifying stars based on brightness is somewhat problematic. A star’s apparent brightness can be affected by its distance from the observer, its size, or by the presence of interstellar dust. Instead, astronomers classify stars based on the major components of their spectra. Much lik ...
... Introduction: Classifying stars based on brightness is somewhat problematic. A star’s apparent brightness can be affected by its distance from the observer, its size, or by the presence of interstellar dust. Instead, astronomers classify stars based on the major components of their spectra. Much lik ...
In Pursuit of the Least Luminous Galaxies
... extrapolation of the known population to predict a total number of ∼100–500 dwarf satellites [14, 15]. Uniform: because the very least luminous MW dwarfs (MV ∼ −2) can currently only be found within 50 kpc, it is presently unclear whether dwarfs can form with such intrinsically low luminosities, or ...
... extrapolation of the known population to predict a total number of ∼100–500 dwarf satellites [14, 15]. Uniform: because the very least luminous MW dwarfs (MV ∼ −2) can currently only be found within 50 kpc, it is presently unclear whether dwarfs can form with such intrinsically low luminosities, or ...
Course Materials - Weber State University
... To derive the mass of the Earth using direct measurement of the acceleration of an object at the Earth's surface. Introduction Sir Isaac Newton changed the way in which humankind viewed the world. His laws describing the fundamental properties of physical reality took scientists from empirical work ...
... To derive the mass of the Earth using direct measurement of the acceleration of an object at the Earth's surface. Introduction Sir Isaac Newton changed the way in which humankind viewed the world. His laws describing the fundamental properties of physical reality took scientists from empirical work ...
Chapter 2 Stellar Dynamics in Galaxies
... but we do not normally use it for these simple cases because a direct analysis based on the acceleration is more straightforward.) The virial theorem provides an easy way to make rough estimates of masses, because velocity measurements can give hT i. To do this we need to measure the observed veloci ...
... but we do not normally use it for these simple cases because a direct analysis based on the acceleration is more straightforward.) The virial theorem provides an easy way to make rough estimates of masses, because velocity measurements can give hT i. To do this we need to measure the observed veloci ...
The Extragalactic Group of MPE and USM
... • Study evolution of galaxies with broadband deep U to K surveys. • LFs, Mass Functions, SFRs do not require spectroscopy but can be derived with accurate photometric redshifts. • Advantage of photo z: no color selection bias, fainter luminosities, larger sample (~10000 galaxies in FDF and GOODS S s ...
... • Study evolution of galaxies with broadband deep U to K surveys. • LFs, Mass Functions, SFRs do not require spectroscopy but can be derived with accurate photometric redshifts. • Advantage of photo z: no color selection bias, fainter luminosities, larger sample (~10000 galaxies in FDF and GOODS S s ...
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.