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Ch. 20 - Astro1010
... the distances to these bright giant stars. • RR Lyrae stars all have about the same luminosity; knowing their apparent magnitude and using the inverse square law allows us to calculate the distance. • Cepheids have a luminosity that is strongly correlated with the period of their oscillations; once ...
... the distances to these bright giant stars. • RR Lyrae stars all have about the same luminosity; knowing their apparent magnitude and using the inverse square law allows us to calculate the distance. • Cepheids have a luminosity that is strongly correlated with the period of their oscillations; once ...
Ionized gas discs in elliptical and S0 galaxies at z < 1
... hence, suffer from mutual light contamination. For this reason, although we include these galaxies in our sample, we do not analyse their individual kinematics. Figs B1 and B2 show the HST postage-stamp images of all the emission-line ETGs in our sample, as well as their single-Sérsic model and res ...
... hence, suffer from mutual light contamination. For this reason, although we include these galaxies in our sample, we do not analyse their individual kinematics. Figs B1 and B2 show the HST postage-stamp images of all the emission-line ETGs in our sample, as well as their single-Sérsic model and res ...
The role of black holes in galaxy formation and evolution
... most dramatic scenario, all the gas is blown away, so black hole growth and star formation suddenly terminate32,33. Computer simulations suggest that this “quenching” is necessary to explain the red colours of ellipticals34,35. Giant ellipticals, in particular, have a chemical composition that indic ...
... most dramatic scenario, all the gas is blown away, so black hole growth and star formation suddenly terminate32,33. Computer simulations suggest that this “quenching” is necessary to explain the red colours of ellipticals34,35. Giant ellipticals, in particular, have a chemical composition that indic ...
Astronomy Astrophysics MY Camelopardalis, a very massive merger progenitor &
... (Andronov et al. 2006). The physics of mergers is poorly understood, but it is believed that they follow a common envelope phase. This phase, when both stars share the same envelope, is extremely important in close binary evolution, but is still not fully understood (Ivanova et al. 2013). The result ...
... (Andronov et al. 2006). The physics of mergers is poorly understood, but it is believed that they follow a common envelope phase. This phase, when both stars share the same envelope, is extremely important in close binary evolution, but is still not fully understood (Ivanova et al. 2013). The result ...
Test Ch. 27 Multiple Choice Identify the choice that best completes
... 6. A star that has a blue-shifted spectrum is most likely moving A. toward the earth. B. away from the sun. C. around the Milky Way Galaxy. D. toward a black hole. 7. The apparent change in the position of an object resulting from a change in the angle or in the position from which it is viewed is c ...
... 6. A star that has a blue-shifted spectrum is most likely moving A. toward the earth. B. away from the sun. C. around the Milky Way Galaxy. D. toward a black hole. 7. The apparent change in the position of an object resulting from a change in the angle or in the position from which it is viewed is c ...
Discovery of an Unusual Optical Transient with the Hubble Space
... features is due to a velocity distribution, the FHWM of this distribution would be ∼12,600 km s−1 . One possibility is that the transient is galactic (z = 0). For a galactic source, the slope of the red continuum gives a lower limit blackbody temperature of 6500 K. The absorption features at 4320 an ...
... features is due to a velocity distribution, the FHWM of this distribution would be ∼12,600 km s−1 . One possibility is that the transient is galactic (z = 0). For a galactic source, the slope of the red continuum gives a lower limit blackbody temperature of 6500 K. The absorption features at 4320 an ...
Chapter 1
... ratios are higher than a cooler nebula. This is because to produce [O iii] λ4363 an electron needs to be excited to 5.3 eV, which requires more energy than for 4959/5007 which result from decay from 1 D2 level, 2.5 eV above the ground-state (see Figure 2.2). Therefore, these ratios can be used to co ...
... ratios are higher than a cooler nebula. This is because to produce [O iii] λ4363 an electron needs to be excited to 5.3 eV, which requires more energy than for 4959/5007 which result from decay from 1 D2 level, 2.5 eV above the ground-state (see Figure 2.2). Therefore, these ratios can be used to co ...
Finding the Most Distant Quasars Using Bayesian Selection Methods
... been almost completely ionised, as the first generations of stars—and quasars—emitted sufficient ultraviolet radiation to separate electrons from protons. The rest-frame wavelength of the break is at 0.1216 µm, but the wavelength of all light is increased by the cosmological expansion; the Universe ...
... been almost completely ionised, as the first generations of stars—and quasars—emitted sufficient ultraviolet radiation to separate electrons from protons. The rest-frame wavelength of the break is at 0.1216 µm, but the wavelength of all light is increased by the cosmological expansion; the Universe ...
Quantitative evidence of an intrinsic luminosity spread in the Orion
... position of individual stars on the HR-diagram with theoretical isochrones and evolutionary tracks. For the majority of stars, the main uncertainties in age are related to the determination of the intrinsic luminosity, since the pre-main-sequence evolution of low mass stars takes place at nearly con ...
... position of individual stars on the HR-diagram with theoretical isochrones and evolutionary tracks. For the majority of stars, the main uncertainties in age are related to the determination of the intrinsic luminosity, since the pre-main-sequence evolution of low mass stars takes place at nearly con ...
PRESENT-DAY CLUSTER FORMATION
... clusters (van den Bergh 1993), but this does not necessarily make them a distinct class of objects because the classical globular clusters all have ages and therefore lifetimes greater than 10 Gyr, whereas open clusters can have any lifetime; thus globular clusters are strongly selected on the basis ...
... clusters (van den Bergh 1993), but this does not necessarily make them a distinct class of objects because the classical globular clusters all have ages and therefore lifetimes greater than 10 Gyr, whereas open clusters can have any lifetime; thus globular clusters are strongly selected on the basis ...
Data Reduction pipeline for MOST Guide Stars and Application to
... of these pixels are summed up, subtracting the individual threshold from each subexposure. This corresponds to an aperture photometry, where the aperture is determined dynamically. The intensity of a stacked exposure (e.g GS I0000 listed above) is obtained by summing up the intensities of all subexp ...
... of these pixels are summed up, subtracting the individual threshold from each subexposure. This corresponds to an aperture photometry, where the aperture is determined dynamically. The intensity of a stacked exposure (e.g GS I0000 listed above) is obtained by summing up the intensities of all subexp ...
Study properties of dwarf galaxies in and around the nearby Lynx
... The galaxy evolution versus the global environment (clusters, groups, voids) is a long-studied problem. Voids are delineated by luminous (L > L*) massive objects and populated by dwarfs. The galaxy densities and other parameters vary significantly from one void to another. One expects that not only ...
... The galaxy evolution versus the global environment (clusters, groups, voids) is a long-studied problem. Voids are delineated by luminous (L > L*) massive objects and populated by dwarfs. The galaxy densities and other parameters vary significantly from one void to another. One expects that not only ...
A Zoo of Galaxies - Cambridge University Press
... of a galaxy, more than just an image is required – we also need an estimate of its distance in order to reveal its size and mass. Hubble is most famous for a discovery which revolutionised extragalactic astronomy in its ability to provide a relatively quick and easy way to make these distance estima ...
... of a galaxy, more than just an image is required – we also need an estimate of its distance in order to reveal its size and mass. Hubble is most famous for a discovery which revolutionised extragalactic astronomy in its ability to provide a relatively quick and easy way to make these distance estima ...
The Scale of the Cosmos
... • Although stars are roughly the same size as the sun, they are so far away that you cannot see them as anything but points of light, even with the largest telescopes on Earth. – Using indirect methods, astronomers have found nearly 200 planets orbiting other stars. ...
... • Although stars are roughly the same size as the sun, they are so far away that you cannot see them as anything but points of light, even with the largest telescopes on Earth. – Using indirect methods, astronomers have found nearly 200 planets orbiting other stars. ...
Astronomy magazine title index 1973-2000
... 17th-Century Nova Indicates Novae are More Numerous then Estimated, 5/86:72 1976 AA: Discovery of a Minor Planet, 6/76:12–13, 12–13, 12–13, ...
... 17th-Century Nova Indicates Novae are More Numerous then Estimated, 5/86:72 1976 AA: Discovery of a Minor Planet, 6/76:12–13, 12–13, 12–13, ...
RUPRECHT 147: THE OLDEST NEARBY OPEN CLUSTER AS A
... −29.3 ± 0.3 mas yr−1 , RV = 41 km s−1 (from the single published measurement in Wilson 1953, see Section 3.2), distance = 200 pc, color excess E(B − V) = 0.2 mag, and an age of 3.2 Myr (presumably from misidentifying blue stragglers as main-sequence turnoff (MSTO) stars). Dias et al. re-classified R ...
... −29.3 ± 0.3 mas yr−1 , RV = 41 km s−1 (from the single published measurement in Wilson 1953, see Section 3.2), distance = 200 pc, color excess E(B − V) = 0.2 mag, and an age of 3.2 Myr (presumably from misidentifying blue stragglers as main-sequence turnoff (MSTO) stars). Dias et al. re-classified R ...
Duplicity and masses
... is far from obvious. The situation will radically change with GAIA. If we consider solar type stars brighter than 14, the volume from which a complete sample can be extracted is limited by the apparent magnitude, not by the astrometric precision on distance. This limiting distance is about 500 pc fo ...
... is far from obvious. The situation will radically change with GAIA. If we consider solar type stars brighter than 14, the volume from which a complete sample can be extracted is limited by the apparent magnitude, not by the astrometric precision on distance. This limiting distance is about 500 pc fo ...
On the Origin of Early-Type Galaxies and the - N
... Because of resolution limitations, we are unable to follow mergers that may occur in the same redshift interval inside structures more massive than galaxy-sized halos (i.e., groups and clusters). However, evidence suggests that in dense environments with high internal velocity dispersion, merging be ...
... Because of resolution limitations, we are unable to follow mergers that may occur in the same redshift interval inside structures more massive than galaxy-sized halos (i.e., groups and clusters). However, evidence suggests that in dense environments with high internal velocity dispersion, merging be ...
Large scale kinematics and dynamical modelling of the Milky Way
... Large scale kinematics and dynamical modelling of the Milky Way nuclear star cluster?,?? ...
... Large scale kinematics and dynamical modelling of the Milky Way nuclear star cluster?,?? ...
Elliptical Galaxies
... found in de Zeeuw and Franx (1992). Dark haloes: mass at large radius Spiral galaxy rotation curves have been used to show that they are embedded in dark haloes that contain three to ten times as much mass as is visible in stars, gas and dust. Can dark haloes be detected in elliptical galaxies? The ...
... found in de Zeeuw and Franx (1992). Dark haloes: mass at large radius Spiral galaxy rotation curves have been used to show that they are embedded in dark haloes that contain three to ten times as much mass as is visible in stars, gas and dust. Can dark haloes be detected in elliptical galaxies? The ...
Astrophysics Lab “A”
... A second series displays UV-spectra from typical stars in the Small and Large Magellanic Cloud (SMC and LMC), collected by the more recent and well-known HST (Hubble Space Telescope). The Magellanic Clouds are relatively small and young neighbor galaxies of our Milky Way and can be found on the sout ...
... A second series displays UV-spectra from typical stars in the Small and Large Magellanic Cloud (SMC and LMC), collected by the more recent and well-known HST (Hubble Space Telescope). The Magellanic Clouds are relatively small and young neighbor galaxies of our Milky Way and can be found on the sout ...
The VLT LEGA-C Spectroscopic Survey: The Physics of Galaxies at
... typically well over 5 Gyr and it is difficult to resolve star formation histories from integrated spectra. Now LEGA-C is obtaining spectra of similar quality for ∼3200 K-band selected galaxies in the redshift range 0.6 < z < 1.0, at a look-back time of 6 − 8 Gyr. LEGA-C is a 4-year, 128-night Public ...
... typically well over 5 Gyr and it is difficult to resolve star formation histories from integrated spectra. Now LEGA-C is obtaining spectra of similar quality for ∼3200 K-band selected galaxies in the redshift range 0.6 < z < 1.0, at a look-back time of 6 − 8 Gyr. LEGA-C is a 4-year, 128-night Public ...
A new view of galaxy evolution
... This dark matter, furthermore, is thought to formed up until the 1980s. make up the bulk of the matter within galaxies. The other idea, based on Cold Dark Matter This has many implications beyond simply the cosmology, is that galaxies form through the idea that the light we see from galaxies is just ...
... This dark matter, furthermore, is thought to formed up until the 1980s. make up the bulk of the matter within galaxies. The other idea, based on Cold Dark Matter This has many implications beyond simply the cosmology, is that galaxies form through the idea that the light we see from galaxies is just ...
Study of an unbiased sample of B stars observed with Hipparcos
... is therefore not sufficient, since we do not only want to discriminate between these three classes, but also derive whether stars are variable supergiants, variable Be stars, or eclipsing binaries rather than belonging to one of the three calibration classes. For the latter three groups of variables ...
... is therefore not sufficient, since we do not only want to discriminate between these three classes, but also derive whether stars are variable supergiants, variable Be stars, or eclipsing binaries rather than belonging to one of the three calibration classes. For the latter three groups of variables ...
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.