Estudio de Cúmulos de Galaxias en el Sloan Digital Sky Survey
... – Building Galaxy Merger Trees. ...
... – Building Galaxy Merger Trees. ...
Science performance of Gaia, ESA`s space
... as it passes through different evolutionary stages, the position of a star in the Hertzsprung–Russell (colour-luminosity) diagram reveals its age. The observed distribution of the Galaxy’s population of stars in the Hertzsprung–Russell diagram can, in principle, be compared with that of models conta ...
... as it passes through different evolutionary stages, the position of a star in the Hertzsprung–Russell (colour-luminosity) diagram reveals its age. The observed distribution of the Galaxy’s population of stars in the Hertzsprung–Russell diagram can, in principle, be compared with that of models conta ...
PDF
... class. These share the disk-like structure of spirals with an inner nuclear bulge, but are devoid of spiral arms and share the smoothness and colours of the elliptical population. Over 90% of nearby luminous galaxies can be categorized within Hubble’s scheme, described in more detail by van den Berg ...
... class. These share the disk-like structure of spirals with an inner nuclear bulge, but are devoid of spiral arms and share the smoothness and colours of the elliptical population. Over 90% of nearby luminous galaxies can be categorized within Hubble’s scheme, described in more detail by van den Berg ...
The Hipparcos Star Globe Booklet - Cosmos
... cluster, the ‘jaw’ of the bull in the Taurus constellation. The data showed that some of the stars that were apparently part of this cluster were impostors: they are not in fact travelling with the cluster, and over time will part company with its true members. ...
... cluster, the ‘jaw’ of the bull in the Taurus constellation. The data showed that some of the stars that were apparently part of this cluster were impostors: they are not in fact travelling with the cluster, and over time will part company with its true members. ...
Exploring the Universe
... • All stars are made up of hot, glowing gases • Stars can appear red, blue or yellow based on surface temperature – Hottest stars are blue, coolest are red – Hertzspurg-Russel diagram classifies stars • 90° of stars are called the main sequence • Other stars include red giants, supergiants, and dwar ...
... • All stars are made up of hot, glowing gases • Stars can appear red, blue or yellow based on surface temperature – Hottest stars are blue, coolest are red – Hertzspurg-Russel diagram classifies stars • 90° of stars are called the main sequence • Other stars include red giants, supergiants, and dwar ...
Can We Travel to Other Stars?
... has traveled the farthest of the four spacecraft; it is now Museum. Similarly, a biolog10.8 billion kilometers from the sun. ical probe could have seeded Earth with life in the first What can be accomplished by a grape- place. The fact that life appeared quite fruit-size probe? Quite a lot, actually ...
... has traveled the farthest of the four spacecraft; it is now Museum. Similarly, a biolog10.8 billion kilometers from the sun. ical probe could have seeded Earth with life in the first What can be accomplished by a grape- place. The fact that life appeared quite fruit-size probe? Quite a lot, actually ...
3D Reconstruction and Visualization of Spiral Galaxies
... sualization relies on a 3D model of the Orion nebula that was determined by astronomers from various observational data [ZO95]. Hanson et al. [HFW00] did a lot of work on large scale visualization of astronomical data and more recently on exploring the physical Universe as an enormous environment. T ...
... sualization relies on a 3D model of the Orion nebula that was determined by astronomers from various observational data [ZO95]. Hanson et al. [HFW00] did a lot of work on large scale visualization of astronomical data and more recently on exploring the physical Universe as an enormous environment. T ...
Power Point - Astronomer`s Proposal Tools Team
... While this issue is important in determining if the object can be used as a guide star, it is not relevant for bright object checking. Failure to do this results in a large number of "unknown" objects appearing in many fields, which then need to be "manually" cleared. Note that an additional step ha ...
... While this issue is important in determining if the object can be used as a guide star, it is not relevant for bright object checking. Failure to do this results in a large number of "unknown" objects appearing in many fields, which then need to be "manually" cleared. Note that an additional step ha ...
Downloadable Full Text
... The UFD Reticulum II (Ret II) was recently discovered with Dark Energy Survey data12,13 and confirmed to be one of the most metal-poor galaxies known14. On 1-4 Oct 2015, we obtained high-resolution spectra of the nine brightest member stars in Ret II (see Table 1, Extended Data Figure 1). The abunda ...
... The UFD Reticulum II (Ret II) was recently discovered with Dark Energy Survey data12,13 and confirmed to be one of the most metal-poor galaxies known14. On 1-4 Oct 2015, we obtained high-resolution spectra of the nine brightest member stars in Ret II (see Table 1, Extended Data Figure 1). The abunda ...
A Modern View of the Universe
... Astronomical Distance Measurements Notice that Figure 1.1 is labeled with an approximate size for each structure in kilometers. In astronomy, many of the distances are so large that kilometers are not the most convenient unit. Instead, we often use two other units: • One astronomical unit (AU) is ...
... Astronomical Distance Measurements Notice that Figure 1.1 is labeled with an approximate size for each structure in kilometers. In astronomy, many of the distances are so large that kilometers are not the most convenient unit. Instead, we often use two other units: • One astronomical unit (AU) is ...
an approach to effective temperature and surface gravity in post
... SDSS gri photometric systems for main sequence stars. These transformations provide absolute magnitude and distance determinations which can be used in space density evaluations at short distances where some or all of the gri magnitudes are saturated. These authors also showed that those formulae we ...
... SDSS gri photometric systems for main sequence stars. These transformations provide absolute magnitude and distance determinations which can be used in space density evaluations at short distances where some or all of the gri magnitudes are saturated. These authors also showed that those formulae we ...
PDF Format
... likely, however, Muller and Kempf suggested that the variable might be two bodies, nearly equal in size and luminosity, with surfaces relatively close in distance that occult each other during the course of revolution. Thereafter, W UMa's classification wavered from such types as an eclipsing binary ...
... likely, however, Muller and Kempf suggested that the variable might be two bodies, nearly equal in size and luminosity, with surfaces relatively close in distance that occult each other during the course of revolution. Thereafter, W UMa's classification wavered from such types as an eclipsing binary ...
The density of very massive evolved galaxies to z≃ 1.7
... K-band absolute magnitudes are −26.8 < MK < −26.1 (5L ∗ < LK < 10L ∗ ) and the resulting stellar masses are in the range 3–6.5 × 1011 M . The analysis we performed unambiguously shows the early-type nature of their spectra. The seven massive, evolved galaxies account for a comoving density of (5.5 ...
... K-band absolute magnitudes are −26.8 < MK < −26.1 (5L ∗ < LK < 10L ∗ ) and the resulting stellar masses are in the range 3–6.5 × 1011 M . The analysis we performed unambiguously shows the early-type nature of their spectra. The seven massive, evolved galaxies account for a comoving density of (5.5 ...
Dark Matter In The 21st Century
... Although microlensing searches have found some faint and compact objects, they seem to be far too rare to make up much of the missing matter it with ...
... Although microlensing searches have found some faint and compact objects, they seem to be far too rare to make up much of the missing matter it with ...
Red Supergiants as the Progenitors of Type IIP Supernova
... While for a 2D model with explosion energy around 1.8× 1051 erg the Si and Ni containing structures still move with nearly 4000 km s-1 (oxygen has velocities up to even 5000 km s-1) at 300 s, a strong deceleration occurs when the metal clumps enter the relatively dense He-shell that forms after the ...
... While for a 2D model with explosion energy around 1.8× 1051 erg the Si and Ni containing structures still move with nearly 4000 km s-1 (oxygen has velocities up to even 5000 km s-1) at 300 s, a strong deceleration occurs when the metal clumps enter the relatively dense He-shell that forms after the ...
Observing the Clustering of Matter and Galaxies
... • Much of the Ly-alpha forest arises from modest density fluctuations and convergent velocity flows!! ...
... • Much of the Ly-alpha forest arises from modest density fluctuations and convergent velocity flows!! ...
Cosmology * The Origin and Evolution of the Universe
... 70+-3 km/sec of additional recession velocity for every megaparsec of additional distance. ...
... 70+-3 km/sec of additional recession velocity for every megaparsec of additional distance. ...
Draft A101 Slide Set #1 - Astronomical Society of the Pacific
... the dust can survive the explosion to become raw material for the formation of other stars—and planets. • This result supports the notion that most of the dust observed in distant young galaxies may have been made by supernova explosions of early massive stars, since no other known mechanism could h ...
... the dust can survive the explosion to become raw material for the formation of other stars—and planets. • This result supports the notion that most of the dust observed in distant young galaxies may have been made by supernova explosions of early massive stars, since no other known mechanism could h ...
Open clusters in the Third Galactic Quadrant III. Alleged binary
... the shape of the observed cluster sequence regarding the adopted metal content used to compute color excesses and distance moduli. Despite the special care put in fitting all the potential cluster members, some sequences are not satisfactorily reproduced by one single isochrone, as said above, and a ...
... the shape of the observed cluster sequence regarding the adopted metal content used to compute color excesses and distance moduli. Despite the special care put in fitting all the potential cluster members, some sequences are not satisfactorily reproduced by one single isochrone, as said above, and a ...
The Hydrogen 21-cm Emission Line
... always want to be in the lowest energy state possible, the electron will eventually flip to the anti-parallel spin direction if it were in the parallel spin direction. The energy difference is very small, so a hydrogen atom can wait on average a few million years before it undergoes this transition. ...
... always want to be in the lowest energy state possible, the electron will eventually flip to the anti-parallel spin direction if it were in the parallel spin direction. The energy difference is very small, so a hydrogen atom can wait on average a few million years before it undergoes this transition. ...
ROTATION CURVES OF HIGH-LUMINOSITY SPIRAL GALAXIES
... only from the study of stellar and gas motions within the Galaxy, but also from a comparison of the properties of our Galaxy with those of neighboring spiral galaxies. Until recently, this comparison was ham pered by very incomplete observations of rotation curves of external galaxies. Optical obse ...
... only from the study of stellar and gas motions within the Galaxy, but also from a comparison of the properties of our Galaxy with those of neighboring spiral galaxies. Until recently, this comparison was ham pered by very incomplete observations of rotation curves of external galaxies. Optical obse ...
Galaxy Collisions, Gas Stripping and Star Formation in the Evolution
... The ICM consists of hot (∼ 107 K) diluted (10−3 − 10−4 cm−3 ) gas, which is detected in X-ray observations. The optical/infrared observations (Renzini, 1997) monitor the stellar component of galaxies, and also their chemical composition. The bulk of the cluster light is produced in bright giant elli ...
... The ICM consists of hot (∼ 107 K) diluted (10−3 − 10−4 cm−3 ) gas, which is detected in X-ray observations. The optical/infrared observations (Renzini, 1997) monitor the stellar component of galaxies, and also their chemical composition. The bulk of the cluster light is produced in bright giant elli ...
Chapter 31
... shape not only because are we too close, but we are also inside the galaxy. • We also cannot tell where its center is, or what Earth’s location is within it. • Astronomers are still refining their measurements. ...
... shape not only because are we too close, but we are also inside the galaxy. • We also cannot tell where its center is, or what Earth’s location is within it. • Astronomers are still refining their measurements. ...
ch19
... Early attempts to locate our solar system produced erroneous results. The main problem was that interstellar extinction allows one to only see the nearby stars and makes distant objects appear dimmer. The key to finding our location in the galaxy is locating bright objects out of the plane of the ga ...
... Early attempts to locate our solar system produced erroneous results. The main problem was that interstellar extinction allows one to only see the nearby stars and makes distant objects appear dimmer. The key to finding our location in the galaxy is locating bright objects out of the plane of the ga ...
Chapter 7 in the LSST Science Book
... This is one of the most pressing problems of galaxy formation today, and any formulation of galaxy formation must account for this tension. Indeed there are a number of competing suggestions aimed at explaining how thin disks may survive and/or emerge from the expected bombardment. To first order, t ...
... This is one of the most pressing problems of galaxy formation today, and any formulation of galaxy formation must account for this tension. Indeed there are a number of competing suggestions aimed at explaining how thin disks may survive and/or emerge from the expected bombardment. To first order, t ...
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.