Astronomy 535 Stellar Structure Evolution
... evolution • Evolution of ISM, IGM, gas fraction, composition, star formation, populations, galaxies, baryonic matter in general profoundly depends on stellar evolution • Fits of models to observations by means of free parameters is standard procedure, but gives unreliable or downright bad results fo ...
... evolution • Evolution of ISM, IGM, gas fraction, composition, star formation, populations, galaxies, baryonic matter in general profoundly depends on stellar evolution • Fits of models to observations by means of free parameters is standard procedure, but gives unreliable or downright bad results fo ...
Ch 33) Astrophysics and Cosmology
... because they are a great distance beyond our Galaxy. At first it was not universally accepted that these objects were extragalactic—that is, outside our Galaxy. But the very large telescopes constructed in the twentieth century revealed that individual stars could be resolved within these extragalac ...
... because they are a great distance beyond our Galaxy. At first it was not universally accepted that these objects were extragalactic—that is, outside our Galaxy. But the very large telescopes constructed in the twentieth century revealed that individual stars could be resolved within these extragalac ...
Preview Sample 1
... of 2.77 AU from the Sun. How would you have reacted as an astronomer of that time? a. Bode’s Law has once again been confirmed b. Bode’s Law has nothing to do with the spacings of the orbits of the planets c. Astronomers should continue to look for other planets to see if they too obey Bode’s Law An ...
... of 2.77 AU from the Sun. How would you have reacted as an astronomer of that time? a. Bode’s Law has once again been confirmed b. Bode’s Law has nothing to do with the spacings of the orbits of the planets c. Astronomers should continue to look for other planets to see if they too obey Bode’s Law An ...
Two families of exocomets in the Beta Pictoris system
... Solar System 7 . Spectroscopic observations of β Pictoris reveal a high rate of transits of small evaporating bodies 8–11 , i.e. exocomets. Here we report the analysis of over a thousand spectra gathered between 2003 and 2011, which provides a sample of about 6000 variable absorption signatures due ...
... Solar System 7 . Spectroscopic observations of β Pictoris reveal a high rate of transits of small evaporating bodies 8–11 , i.e. exocomets. Here we report the analysis of over a thousand spectra gathered between 2003 and 2011, which provides a sample of about 6000 variable absorption signatures due ...
February - Saguaro Astronomy Club
... Canis Major is a prominent winter constellation sitting on the Milky Way. As such, it contains many open clusters, typical of the winter Milky Way, and a few nebulae. It also contains the brightest star in the sky other than the sun, Sirius, which is unmistakable. Sirius has as its companion a white ...
... Canis Major is a prominent winter constellation sitting on the Milky Way. As such, it contains many open clusters, typical of the winter Milky Way, and a few nebulae. It also contains the brightest star in the sky other than the sun, Sirius, which is unmistakable. Sirius has as its companion a white ...
Blue horizontal branch stars in the Sloan Digital Sky Survey:
... instrumental fluxes are calibrated via a network of primary and secondary stellar flux standards to ABν magnitudes (Fukugita et al. 1996; Hogg et al. 2001; Smith et al. 2002). We use the “psf magnitude,” which represents the magnitude of the best-fit psf to the object, as determined by Photo version ...
... instrumental fluxes are calibrated via a network of primary and secondary stellar flux standards to ABν magnitudes (Fukugita et al. 1996; Hogg et al. 2001; Smith et al. 2002). We use the “psf magnitude,” which represents the magnitude of the best-fit psf to the object, as determined by Photo version ...
The GalMer database: galaxy mergers in the virtual observatory*
... formation efficiency on retrograde orbits is generally higher than for direct encounters (Di Matteo et al. 2007). One needs to explore a large multi-dimensional parameter space (different initial morphologies related to gas content, orbital configurations, mass ratios, etc.) by running thousands of sim ...
... formation efficiency on retrograde orbits is generally higher than for direct encounters (Di Matteo et al. 2007). One needs to explore a large multi-dimensional parameter space (different initial morphologies related to gas content, orbital configurations, mass ratios, etc.) by running thousands of sim ...
AGN surveys to study galaxy evolution along cosmic times
... star formation and black hole accretion. The long wavelengths of these lines, ranging from the far-IR for the photodissociation and HII region lines, through the mid-IR for the AGN lines, to the near-IR for the coronal lines, ensure that we can observe these different tracers by minimising the effect ...
... star formation and black hole accretion. The long wavelengths of these lines, ranging from the far-IR for the photodissociation and HII region lines, through the mid-IR for the AGN lines, to the near-IR for the coronal lines, ensure that we can observe these different tracers by minimising the effect ...
Article PDF - IOPscience
... color is plotted as a function of SDSS color (g −r) and SuprimeCam color (B − R). As the R − NB is calculated from the SDSS spectrum, we use fiberMag for (g −r), which corresponds to the color of the central 3 arcsec aperture. The large dots represent ...
... color is plotted as a function of SDSS color (g −r) and SuprimeCam color (B − R). As the R − NB is calculated from the SDSS spectrum, we use fiberMag for (g −r), which corresponds to the color of the central 3 arcsec aperture. The large dots represent ...
Lab 14 Galaxy Morphology
... a telescope was used to look at them. While many of these nebulae are clouds of glowing hydrogen gas within the Milky Way galaxy (HII regions), others (some of which resembled pinwheels) were true galaxies–similar to the Milky Way in size and structure, but millions of light years from us. It was no ...
... a telescope was used to look at them. While many of these nebulae are clouds of glowing hydrogen gas within the Milky Way galaxy (HII regions), others (some of which resembled pinwheels) were true galaxies–similar to the Milky Way in size and structure, but millions of light years from us. It was no ...
High molecular gas fractions in normal massive star
... resolves for the first time the cold molecular gas distribution in a clearly non-merging high-z SFG. This system looks like a scaled-up version (in terms of star formation rate and gas mass) of normal z < 0 gas-rich disk galaxies. In the optical images, EGS 1305123 is a nearly face-on, large spiral ...
... resolves for the first time the cold molecular gas distribution in a clearly non-merging high-z SFG. This system looks like a scaled-up version (in terms of star formation rate and gas mass) of normal z < 0 gas-rich disk galaxies. In the optical images, EGS 1305123 is a nearly face-on, large spiral ...
A limit on the number density of bright z ≈ 7 galaxies
... We employ the Lyman break technique, identifying sources that drop dramatically in flux between the reddest optical filter (z band) and the bluest commonly used filter in the IR (J band). This criterion is sensitive to galaxies at z > 7, at which redshift flux longwards of the Lyman break becomes sh ...
... We employ the Lyman break technique, identifying sources that drop dramatically in flux between the reddest optical filter (z band) and the bluest commonly used filter in the IR (J band). This criterion is sensitive to galaxies at z > 7, at which redshift flux longwards of the Lyman break becomes sh ...
L25 A NEW CULPRIT IN THE SECOND
... intermediate-age stellar population. Is the spur associated with a foreground object?—A 15 Gyr isochrone with z = 0.0004 but an assumed distance modulus of 18.8 fits the spur reasonably well (Fig. 2c). Unfortunately, this good fit is achieved at the cost of a highly contrived scenario. We would requ ...
... intermediate-age stellar population. Is the spur associated with a foreground object?—A 15 Gyr isochrone with z = 0.0004 but an assumed distance modulus of 18.8 fits the spur reasonably well (Fig. 2c). Unfortunately, this good fit is achieved at the cost of a highly contrived scenario. We would requ ...
What Can You See With a Telescope
... 250 asteroids larger than 62 miles in diameter and perhaps 1,000,000 with diameters greater than one-half a mile. Asteroid Brightness—Another Factor to Consider The size of the majority of asteroids is quite small, but that is not the whole story. An asteroid’s brightness varies according to its orb ...
... 250 asteroids larger than 62 miles in diameter and perhaps 1,000,000 with diameters greater than one-half a mile. Asteroid Brightness—Another Factor to Consider The size of the majority of asteroids is quite small, but that is not the whole story. An asteroid’s brightness varies according to its orb ...
A SEARCH FOR JUPITER-MASS COMPANIONS TO NEAR
... We should be able to relate the F -test results to the correlated periodogram results since the two statistics are so closely related (see Eq. (A3)). The correlated periodogram evaluated at a period of 100 yr ranges from 5.2 for Cep (see Figure 3) to 7.4 for Boo A. None of the corresponding peri ...
... We should be able to relate the F -test results to the correlated periodogram results since the two statistics are so closely related (see Eq. (A3)). The correlated periodogram evaluated at a period of 100 yr ranges from 5.2 for Cep (see Figure 3) to 7.4 for Boo A. None of the corresponding peri ...
here - ISAS/JAXA
... Christopher Fuller Galaxy Evolution in Coma, Fornax and Virgo nearby and Clusters as seen by Herschel Yusei Koyama SPICA distant cluster survey: unveiling the dust-obscured star formation activity triggered by young cluster environments Kazumi Murata Environmental dependence of galaxy properties rev ...
... Christopher Fuller Galaxy Evolution in Coma, Fornax and Virgo nearby and Clusters as seen by Herschel Yusei Koyama SPICA distant cluster survey: unveiling the dust-obscured star formation activity triggered by young cluster environments Kazumi Murata Environmental dependence of galaxy properties rev ...
Riccioli Measures the Stars: Observations of the
... the stars dwarf the orbit of the Earth.* Riccioli also critiques Landsbergius who cites naked eye measurements of star sizes, including those of Tycho Brahe, that put the observed diameter of first magnitude stars at a minute (60‟‟) or greater, but who then adds that through the telescope star diam ...
... the stars dwarf the orbit of the Earth.* Riccioli also critiques Landsbergius who cites naked eye measurements of star sizes, including those of Tycho Brahe, that put the observed diameter of first magnitude stars at a minute (60‟‟) or greater, but who then adds that through the telescope star diam ...
A dozen new galaxies caught in the act: Gas stripping and extended
... would have negative values. This point was verified using B and i-band data. If a region was bright in NB and also red in the B − R and R − i colors, it was regarded as a residual. If the color was blue, however, it was regarded as a star-forming region, and was included in our sample of Hα clouds. ...
... would have negative values. This point was verified using B and i-band data. If a region was bright in NB and also red in the B − R and R − i colors, it was regarded as a residual. If the color was blue, however, it was regarded as a star-forming region, and was included in our sample of Hα clouds. ...
Multiple Linear Regression
... Weather modification, or cloud seeding, is the treatment of individual clouds or storm systems with various inorganic and organic materials in the hope of achieving an increase in rainfall. Introduction of such material into a cloud that contains supercooled water, that is, liquid water colder than ...
... Weather modification, or cloud seeding, is the treatment of individual clouds or storm systems with various inorganic and organic materials in the hope of achieving an increase in rainfall. Introduction of such material into a cloud that contains supercooled water, that is, liquid water colder than ...
Early-type dwarf galaxies in clusters - ARI
... well-defined relation between colour and magnitude, with more luminous objects having redder colours (e.g. Caldwell, 1983; Sandage & Visvanathan, 1978). While this trend includes the dEs, there has been disagreement about whether or not they follow the same CMR as the giant ellipticals, and whether ...
... well-defined relation between colour and magnitude, with more luminous objects having redder colours (e.g. Caldwell, 1983; Sandage & Visvanathan, 1978). While this trend includes the dEs, there has been disagreement about whether or not they follow the same CMR as the giant ellipticals, and whether ...
Confronting predictions of the galaxy stellar mass function with
... We investigate the evolution of the galaxy stellar mass function at high redshift (z ≥ 5) using a pair of large cosmological hydrodynamical simulations: MassiveBlack and MassiveBlack-II. By combining these simulations, we can study the properties of galaxies with stellar masses greater than 108 M h ...
... We investigate the evolution of the galaxy stellar mass function at high redshift (z ≥ 5) using a pair of large cosmological hydrodynamical simulations: MassiveBlack and MassiveBlack-II. By combining these simulations, we can study the properties of galaxies with stellar masses greater than 108 M h ...
The Milky Way and Andromeda galaxies in a constrained
... therefore the problem of understanding how star formation proceeds in galaxies, and what the possible regulating mechanisms and their relative efficiencies are. ...
... therefore the problem of understanding how star formation proceeds in galaxies, and what the possible regulating mechanisms and their relative efficiencies are. ...
A substellar component orbiting the F
... between the two stars of about 1520 ± 54 AU. The orbital period thus is likely to be larger than 10000 years. As expected for a close binary system, 30 Ari A is an X-ray source and was detected by ROSAT with an X-ray flux of 0.472 ± 0.046 ct/s (Zickgraf et al. 2003). 30 Ari B was not detected by ROS ...
... between the two stars of about 1520 ± 54 AU. The orbital period thus is likely to be larger than 10000 years. As expected for a close binary system, 30 Ari A is an X-ray source and was detected by ROSAT with an X-ray flux of 0.472 ± 0.046 ct/s (Zickgraf et al. 2003). 30 Ari B was not detected by ROS ...
Presentation - Copernicus.org
... Planetesimal disks are common •Protoplanetary disks of gas and dust (100:1 mass ratio) are present around most stars; they dissipate in ~ 6 Myr. ...
... Planetesimal disks are common •Protoplanetary disks of gas and dust (100:1 mass ratio) are present around most stars; they dissipate in ~ 6 Myr. ...
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.