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Diapositiva 1 - INAF-Osservatorio Astronomico di Bologna
... They can increase their mass and enlarge their size by subsequent mergers (major and minor/satellite) and through starburts till z~2.5 (contrary to oETGs). Different progenitors oETGs: we should see them as they are (younger) till z~3-3.5 yETGs: in the phase of merging, or star forming and interacti ...
... They can increase their mass and enlarge their size by subsequent mergers (major and minor/satellite) and through starburts till z~2.5 (contrary to oETGs). Different progenitors oETGs: we should see them as they are (younger) till z~3-3.5 yETGs: in the phase of merging, or star forming and interacti ...
Time Dependence of the Charge Transfer Efficiency on the WFPC2
... standard-wide comparison field measurement so that the comparison is not simply the same data with and without the CTE correction. See Figure 1 in ISR 97-08 to make this clearer (e.g., field 1 with the WF2 was compared to field 1 with WF3, so the Y direction is 90 degrees different). Figure 2 shows ...
... standard-wide comparison field measurement so that the comparison is not simply the same data with and without the CTE correction. See Figure 1 in ISR 97-08 to make this clearer (e.g., field 1 with the WF2 was compared to field 1 with WF3, so the Y direction is 90 degrees different). Figure 2 shows ...
The Milky Way Laboratory
... Next Steps: The Skeleton of the Milky Way • Identify more Bones of the Milky Way. Combine with other tracers (e.g. CO, HI, dense gas) to develop a model of Galactic structure • Measure physical properties and kinematics of Bones – compare directly with simulations. Develop improved Galactic-scale s ...
... Next Steps: The Skeleton of the Milky Way • Identify more Bones of the Milky Way. Combine with other tracers (e.g. CO, HI, dense gas) to develop a model of Galactic structure • Measure physical properties and kinematics of Bones – compare directly with simulations. Develop improved Galactic-scale s ...
Star Formation in Disks: Spiral Arms, Turbulence, and Triggering
... triggering. Energy types include thermal, magnetic, turbulent, cosmic ray, and rotational. The first four are all comparable and equal to several tenths of an eV cm−3 . Rotational energy is much denser, several hundred eV cm−3 . Of the first four, only supersonic turbulence has been associated with st ...
... triggering. Energy types include thermal, magnetic, turbulent, cosmic ray, and rotational. The first four are all comparable and equal to several tenths of an eV cm−3 . Rotational energy is much denser, several hundred eV cm−3 . Of the first four, only supersonic turbulence has been associated with st ...
Constraining the star formation histories of spiral bulges
... The bulges investigated are found to have central line strengths comparable to those of single stellar populations of approximately solar abundance or above. Negative radial gradients are observed in line strengths, similar to those exhibited by elliptical galaxies. The bulge data are also consisten ...
... The bulges investigated are found to have central line strengths comparable to those of single stellar populations of approximately solar abundance or above. Negative radial gradients are observed in line strengths, similar to those exhibited by elliptical galaxies. The bulge data are also consisten ...
The Nature of the Stars
... viewing, the greater the parallax shift. To see this, repeat the experiment around you by comparing with your hand held closer to your the images from your face. Your brain analyzes such paral- left and right eyes—we lax shifts constantly as it compares find the distances to the images from your lef ...
... viewing, the greater the parallax shift. To see this, repeat the experiment around you by comparing with your hand held closer to your the images from your face. Your brain analyzes such paral- left and right eyes—we lax shifts constantly as it compares find the distances to the images from your lef ...
The Correlation of Lithium and Beryllium in F and G
... Although Li has been extensively observed in main-sequence field and cluster stars, there are relatively fewer observations of Be. We have obtained Keck HIRES spectra of 36 late F and early G dwarfs in order to study the Li-Be correlation we found previously in the temperature regime of 5900–6650 K. ...
... Although Li has been extensively observed in main-sequence field and cluster stars, there are relatively fewer observations of Be. We have obtained Keck HIRES spectra of 36 late F and early G dwarfs in order to study the Li-Be correlation we found previously in the temperature regime of 5900–6650 K. ...
Document
... Bursts (GRBs) and can be used as tracers of low mass star formation • At high redshifts, a GRB will show up as a dropout (i.e. selected like an LBG), but will fade rapidly with time • The most distant objects known in the Universe are GRBs (z=8.3) Current Topics: Lyman Break Galaxies - Lecture 4 ...
... Bursts (GRBs) and can be used as tracers of low mass star formation • At high redshifts, a GRB will show up as a dropout (i.e. selected like an LBG), but will fade rapidly with time • The most distant objects known in the Universe are GRBs (z=8.3) Current Topics: Lyman Break Galaxies - Lecture 4 ...
ASP2011_2007 - users.monash.edu.au
... This method is good to a few hundred parsecs; the Hipparcos satellite, launched by ESA in 1989, obtained milliarcsecond positions for 120,000 stars and thus determined their positions to high precision out to almost 1000 pc. The parsec is effectively the standard distance unit in astrophysics. For o ...
... This method is good to a few hundred parsecs; the Hipparcos satellite, launched by ESA in 1989, obtained milliarcsecond positions for 120,000 stars and thus determined their positions to high precision out to almost 1000 pc. The parsec is effectively the standard distance unit in astrophysics. For o ...
Is there a Supermassive Black Hole at the Center of the Milky Way?
... gravitationally bound orbits was questioned. Finally, the “point-mass” component needed only to be smaller than ≈ 0.2 parsecs, and as discussed later in §5, this does not require a SMBH. While gas is susceptible to non-gravitational forces, stars are not, and soon measurements of radial velocities ( ...
... gravitationally bound orbits was questioned. Finally, the “point-mass” component needed only to be smaller than ≈ 0.2 parsecs, and as discussed later in §5, this does not require a SMBH. While gas is susceptible to non-gravitational forces, stars are not, and soon measurements of radial velocities ( ...
The local density of matter mapped by Hipparcos
... local disc, measuring the total amount of gravitating matter as r0 0:076 ^ 0:015 M( pc23 , while the amount of visible matter is estimated to lie in the range rvis 0:06; 0:10 M( pc23 . Another study using Hipparcos data was made by Pham (1997), who used a different method to study F stars, whe ...
... local disc, measuring the total amount of gravitating matter as r0 0:076 ^ 0:015 M( pc23 , while the amount of visible matter is estimated to lie in the range rvis 0:06; 0:10 M( pc23 . Another study using Hipparcos data was made by Pham (1997), who used a different method to study F stars, whe ...
m82 as a galaxy: morphology and stellar content of the disk and halo
... The shortest scale-length is reached in the K-band, where the observed scale-length (4700 = 0.8 kpc) is expected to represent the scale-length of the mass distribution. In the very central part, there is clearly an excess of NIR light over the exponential disk, which is associated with the central s ...
... The shortest scale-length is reached in the K-band, where the observed scale-length (4700 = 0.8 kpc) is expected to represent the scale-length of the mass distribution. In the very central part, there is clearly an excess of NIR light over the exponential disk, which is associated with the central s ...
ppt - Serbian Virtual Observatory
... duration of the single exposure, which is a low time resolution, appears. Thus it may preclude detection of energetic, but low amplitude flare-events on bright stars. The flare star surveys with used flare star monitoring photographic method of multi-exposure images each of 10-minute duration usuall ...
... duration of the single exposure, which is a low time resolution, appears. Thus it may preclude detection of energetic, but low amplitude flare-events on bright stars. The flare star surveys with used flare star monitoring photographic method of multi-exposure images each of 10-minute duration usuall ...
A HUBBLE SPACE TELESCOPE CENSUS OF
... of view is 3600 3600 . We used the F814W filter with an integration time of 600 s, split into two exposures of 300 s to allow cosmic-ray rejection. We also took a short exposure (40 s) to guard against saturation of the WFPC2 detectors in the 300 s exposures. However, none of the galaxies was brigh ...
... of view is 3600 3600 . We used the F814W filter with an integration time of 600 s, split into two exposures of 300 s to allow cosmic-ray rejection. We also took a short exposure (40 s) to guard against saturation of the WFPC2 detectors in the 300 s exposures. However, none of the galaxies was brigh ...
Lithium production by thermohaline mixing in low
... Spite plateau value. It is therefore possible that low-mass AGB stars have contributed to the Galaxy’s Li budget. The effect of a population of low-mass, low-metallicity lithium producers on Galactic chemical evolution models should be investigated. These models do improve the agreement of the AGB m ...
... Spite plateau value. It is therefore possible that low-mass AGB stars have contributed to the Galaxy’s Li budget. The effect of a population of low-mass, low-metallicity lithium producers on Galactic chemical evolution models should be investigated. These models do improve the agreement of the AGB m ...
Sample syllabus 2 - Johns Hopkins Center for Talented Youth
... laws governing astronomical objects and the universe itself – is the key tool for determining how the universe works, how it started, and where its headed. Students explore the structure of the universe by first learning about scale and distances of important astronomical objects such as planets, sta ...
... laws governing astronomical objects and the universe itself – is the key tool for determining how the universe works, how it started, and where its headed. Students explore the structure of the universe by first learning about scale and distances of important astronomical objects such as planets, sta ...
Chapter 2 The HRS+ Sample 2.1 The Herschel Reference Survey
... images, may be found in Appendix A. For the following analysis, two subsamples are created based on the environment inhabited by each object in the sample. All galaxies with membership of the Virgo cluster, as defined by Gavazzi et al. (1999), comprise the ‘cluster’ subsample and galaxies outside Vi ...
... images, may be found in Appendix A. For the following analysis, two subsamples are created based on the environment inhabited by each object in the sample. All galaxies with membership of the Virgo cluster, as defined by Gavazzi et al. (1999), comprise the ‘cluster’ subsample and galaxies outside Vi ...
Joint formation of QSOs and spheroids: QSOs as clocks of star
... Direct and indirect observational evidence leads to the conclusion that high-redshift QSOs did shine in the core of early-type protogalaxies during their main episode of star formation. Exploiting this fact, we derive the rate of formation of this kind of stellar system at high redshift by using the ...
... Direct and indirect observational evidence leads to the conclusion that high-redshift QSOs did shine in the core of early-type protogalaxies during their main episode of star formation. Exploiting this fact, we derive the rate of formation of this kind of stellar system at high redshift by using the ...
PDF Manual
... calculations somewhere far off civilization, desktop PCs and power lines, under a dark night sky. Urania makes it unnecessary for the observer to look up positions in printed planetary ephemerides or look into tables of data transformation: all this and much more is calculated to good accuracy using ...
... calculations somewhere far off civilization, desktop PCs and power lines, under a dark night sky. Urania makes it unnecessary for the observer to look up positions in printed planetary ephemerides or look into tables of data transformation: all this and much more is calculated to good accuracy using ...
Star Formation in Isolated Disk Galaxies. I. Models and
... positions as we vary the number of the processors. The unmodified GADGET v1.1 also shows such small deviations as processor number is changed. These variations are due to the differences in the extent of the domain on each processor. When the force on a particular particle is computed, the force exe ...
... positions as we vary the number of the processors. The unmodified GADGET v1.1 also shows such small deviations as processor number is changed. These variations are due to the differences in the extent of the domain on each processor. When the force on a particular particle is computed, the force exe ...
Semiar PPT
... of a massive star (at least in several cases!). 2. The short GRBs have much less energy and are associated with old stellar population. ...
... of a massive star (at least in several cases!). 2. The short GRBs have much less energy and are associated with old stellar population. ...
What To See Telescope(Jul-Sept) v1 - One
... captured the imagination of stargazers for thousands of years. Ancient Egyptians identified the constellation as the goddess Tawaret. Arabs called these stars the “Mother Camels”. And the Greeks and Romans defined the constellation as a dragon who some say was killed by Minerva (Athena) and hurled i ...
... captured the imagination of stargazers for thousands of years. Ancient Egyptians identified the constellation as the goddess Tawaret. Arabs called these stars the “Mother Camels”. And the Greeks and Romans defined the constellation as a dragon who some say was killed by Minerva (Athena) and hurled i ...
The effect of the environment on the HI scaling relations
... for the Hi deficiency parameter. We show that the distance from the ‘Hi gas fraction plane’ can be used as an alternative estimate for the Hi deficiency, but only if carefully calibrated on pre-defined samples of ‘unperturbed’ systems. Key words: galaxies:evolution–galaxies: fundamental parameters–g ...
... for the Hi deficiency parameter. We show that the distance from the ‘Hi gas fraction plane’ can be used as an alternative estimate for the Hi deficiency, but only if carefully calibrated on pre-defined samples of ‘unperturbed’ systems. Key words: galaxies:evolution–galaxies: fundamental parameters–g ...
FIRST STELLAR ABUNDANCES IN THE DWARF IRREGULAR
... The analysis of bright nebular emission lines of H II regions has been the most frequent approach to modeling chemical evolution of more distant galaxies to date (Matteucci & Tosi 1985). So far, only a very limited number of elements can be examined and quantified when using this approach. The chemi ...
... The analysis of bright nebular emission lines of H II regions has been the most frequent approach to modeling chemical evolution of more distant galaxies to date (Matteucci & Tosi 1985). So far, only a very limited number of elements can be examined and quantified when using this approach. The chemi ...
Chapter 6 in the LSST Science Book
... have begun bound to one another, and both may be on their first approach to the Milky Way, not already bound to it. Attempts to model the motion of the Clouds together with a formation model for the Magellanic Stream in light of the new data (e.g., Besla et al. 2009) are very much works in progress. ...
... have begun bound to one another, and both may be on their first approach to the Milky Way, not already bound to it. Attempts to model the motion of the Clouds together with a formation model for the Magellanic Stream in light of the new data (e.g., Besla et al. 2009) are very much works in progress. ...
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.