Updated
... The Ascent of Man Space, Logistics, Engineering # Astronomy in Color * What Star is That?* What Star is That?* All About Telescopes * Celestial Basic - Astronomy on Your Computer * Venus: An Errant Twin Advanced Skywatching* The Star Book* Burnham’s Celestial Handbook - Vol 1, 2 and 3* Burnham’s Cel ...
... The Ascent of Man Space, Logistics, Engineering # Astronomy in Color * What Star is That?* What Star is That?* All About Telescopes * Celestial Basic - Astronomy on Your Computer * Venus: An Errant Twin Advanced Skywatching* The Star Book* Burnham’s Celestial Handbook - Vol 1, 2 and 3* Burnham’s Cel ...
Local Universe Supernovae and Their Host Galaxies
... • SNe discovered in pairs show isotropic azimuthal distributions and do not favor a particular direction with respect to the companion galaxy. • SN rate in galaxies members of pairs is ̴ 40% higher than in average galaxy and ̴ 60% higher than in members of groups. • With the possible exception of st ...
... • SNe discovered in pairs show isotropic azimuthal distributions and do not favor a particular direction with respect to the companion galaxy. • SN rate in galaxies members of pairs is ̴ 40% higher than in average galaxy and ̴ 60% higher than in members of groups. • With the possible exception of st ...
Galaxy Assembly through Mergers
... without the people that I thank in the following lines. They have been here with me, in many ways, since the very beginning of this journey. First and foremost, I am deeply grateful to my supervisors Jarle Brinchmann and Catarina Lobo from whom I have learned much more than I can possibly grasp. Cat ...
... without the people that I thank in the following lines. They have been here with me, in many ways, since the very beginning of this journey. First and foremost, I am deeply grateful to my supervisors Jarle Brinchmann and Catarina Lobo from whom I have learned much more than I can possibly grasp. Cat ...
Niraj D. Welikala Thesis - D-Scholarship@Pitt
... The formation and evolution of galaxies is one of the most challenging problems in astrophysics today. Throughout the 20th century, our understanding of the way we think galaxies form has changed dramatically. Some of the early models of galaxy formation favored “Monolithic Collapse”, whereby galaxi ...
... The formation and evolution of galaxies is one of the most challenging problems in astrophysics today. Throughout the 20th century, our understanding of the way we think galaxies form has changed dramatically. Some of the early models of galaxy formation favored “Monolithic Collapse”, whereby galaxi ...
arXiv:astro-ph/0702414v1 15 Feb 2007
... complex Lyα profile morphologies. The diffusion in space increases the optical path of the Lyα compared to UV-continuum photons. Therefore, any dust distributed uniformly in a neutral medium affects the Lyα photons more strongly than the UV-continuum photons. This could explain the fact that most UV ...
... complex Lyα profile morphologies. The diffusion in space increases the optical path of the Lyα compared to UV-continuum photons. Therefore, any dust distributed uniformly in a neutral medium affects the Lyα photons more strongly than the UV-continuum photons. This could explain the fact that most UV ...
The correlation between galaxy morphology and star
... et al. 2010; Cassata et al. 2010). The number density of these galaxies rapidly increases, by a factor of five, from z ∼ 2 to z ∼ 1, and they are up to 5 times more compact in size than local ones with similar mass (Cassata et al. 2011, 2013). Recent works have suggested, however, that a large fract ...
... et al. 2010; Cassata et al. 2010). The number density of these galaxies rapidly increases, by a factor of five, from z ∼ 2 to z ∼ 1, and they are up to 5 times more compact in size than local ones with similar mass (Cassata et al. 2011, 2013). Recent works have suggested, however, that a large fract ...
environmental effects on galaxy evolution in nearby clusters
... been possible. Many thanks to Bianca Poggianti for a careful reading of my thesis and for her useful comments and suggestions. I would like also to thank Monica Colpi for her scientific and, especially, financial support during these three years. Arigato to Tsutomu Takeuchi and Akio Inoue for useful ...
... been possible. Many thanks to Bianca Poggianti for a careful reading of my thesis and for her useful comments and suggestions. I would like also to thank Monica Colpi for her scientific and, especially, financial support during these three years. Arigato to Tsutomu Takeuchi and Akio Inoue for useful ...
Galaxy Formation and Evolution.
... H O U J U N M O is Professor of Astrophysics at the University of Massachusetts. He is known for his work on the formation and clustering of galaxies and their dark matter halos. F R A N K VA N D E N B O S C H is Assistant Professor at Yale University, and is known for his studies of the formation, ...
... H O U J U N M O is Professor of Astrophysics at the University of Massachusetts. He is known for his work on the formation and clustering of galaxies and their dark matter halos. F R A N K VA N D E N B O S C H is Assistant Professor at Yale University, and is known for his studies of the formation, ...
- ISP 205, sec 1 - Visions of the
... of the four jovian planets in our solar system? 27. A They lack solid surfaces. B They are much more massive then any of the terrestrial planets. C They are higher in average density than are the terrestrial planets. D They are composed of mainly hydrogen, helium, and hydrogen compounds. Answer for ...
... of the four jovian planets in our solar system? 27. A They lack solid surfaces. B They are much more massive then any of the terrestrial planets. C They are higher in average density than are the terrestrial planets. D They are composed of mainly hydrogen, helium, and hydrogen compounds. Answer for ...
Catalogues of isolated galaxies, isolated pairs, and isolated triplets
... 2. Data and definition of the isolation The data is based on the Tenth Data Release of the SDSS (DR10; Ahn et al. 2013). We defined a primary sample composed of galaxies from the main spectroscopic sample (Strauss et al. 2002) with r-band (the deepest SDSS images) model magnitudes in the range 11 ≤ ...
... 2. Data and definition of the isolation The data is based on the Tenth Data Release of the SDSS (DR10; Ahn et al. 2013). We defined a primary sample composed of galaxies from the main spectroscopic sample (Strauss et al. 2002) with r-band (the deepest SDSS images) model magnitudes in the range 11 ≤ ...
... The relative importance of the different physical processes of galaxy evolution (Figure 1) changes as the Universe expands. Rapid processes that happen in discrete events are giving way to slow, ongoing processes. At early times, galactic evolution was dominated by a combination of dissipative colla ...
Galaxies in the Universe: An Introduction, Second Edition
... like geology or meteorology. We must take the Universe as we find it, and deduce how the basic properties of matter have constrained the galaxies that happened to form. Sometimes our understanding is general but not detailed. We can estimate how much water the Sun’s heat can evaporate from Earth’s oc ...
... like geology or meteorology. We must take the Universe as we find it, and deduce how the basic properties of matter have constrained the galaxies that happened to form. Sometimes our understanding is general but not detailed. We can estimate how much water the Sun’s heat can evaporate from Earth’s oc ...
The most metal-poor galaxies
... A good, well defined, metallicity indicator would be the fraction of baryonic matter that has been converted into heavier elements by means of stellar nucleosynthesis. This material may have been returned to the ISM or may still be locked up in stars. Such a definition would indicate that our main ...
... A good, well defined, metallicity indicator would be the fraction of baryonic matter that has been converted into heavier elements by means of stellar nucleosynthesis. This material may have been returned to the ISM or may still be locked up in stars. Such a definition would indicate that our main ...
THE STAR FORMATION AND NUCLEAR ACCRETION HISTORIES OF NORMAL GALAXIES
... of the sample. Our results suggest that X-ray emission from spectroscopically late-type galaxies is dominated by star formation, while that from early-type galaxies is dominated by a combination of hot gas and active galactic nucleus (AGN) emission. We find that the mean star formation and supermass ...
... of the sample. Our results suggest that X-ray emission from spectroscopically late-type galaxies is dominated by star formation, while that from early-type galaxies is dominated by a combination of hot gas and active galactic nucleus (AGN) emission. We find that the mean star formation and supermass ...
β Relation for Local Galaxies
... lost to dust attenuation and being re-emitted in the infrared (IR). UV wavelengths, while the most susceptible to the effects of dust, provide insights on the young stellar populations, while longer wavelengths provide information on the older and more evolved stellar populations. Observations from ...
... lost to dust attenuation and being re-emitted in the infrared (IR). UV wavelengths, while the most susceptible to the effects of dust, provide insights on the young stellar populations, while longer wavelengths provide information on the older and more evolved stellar populations. Observations from ...
AGN host galaxies at redshift z ≈ 0.7: peculiar or not?
... galaxy images in a χ2 minimization approach. For the decomposition of the AGN images, the individually constructed local PSF was used as a model for the unresolved nucleus of the AGN, and a Sérsic profile (Sérsic 1968) as a model for the host galaxy. This model can be used to approximate various k ...
... galaxy images in a χ2 minimization approach. For the decomposition of the AGN images, the individually constructed local PSF was used as a model for the unresolved nucleus of the AGN, and a Sérsic profile (Sérsic 1968) as a model for the host galaxy. This model can be used to approximate various k ...
Preliminary Talk Abstract Book - MoCA
... Massive early-type galaxies (ETGs) are on average more compact (smaller size and higher velocity dispersion) at higher redshift. Galaxy mergers are believed to contribute substantially to this cosmological galaxy growth. I will present the results of theoretical models for the joint evolution of mas ...
... Massive early-type galaxies (ETGs) are on average more compact (smaller size and higher velocity dispersion) at higher redshift. Galaxy mergers are believed to contribute substantially to this cosmological galaxy growth. I will present the results of theoretical models for the joint evolution of mas ...
The Physical Origins of The Morphology
... which indicates that gas stripping occurs. Eventually, in all these scenarios, gas stripping removes the fuel for star formation, presumably producing a quiescent galaxy which is similar to a normal spiral galaxy in terms of its structural properties such as its bulge-to-disk ratio. Early on, van de ...
... which indicates that gas stripping occurs. Eventually, in all these scenarios, gas stripping removes the fuel for star formation, presumably producing a quiescent galaxy which is similar to a normal spiral galaxy in terms of its structural properties such as its bulge-to-disk ratio. Early on, van de ...
Mapping the Pathways of Galaxy Transformation Across Time and
... activity, stellar mass assembly, and morphology. In this talk, I will illustrate the relation between global properties and kpc-scale substructures of galaxies out to z∼2. Using combined high resolution data from the Hubble Space Telescope and long exposure spectroscopic observations with the Keck t ...
... activity, stellar mass assembly, and morphology. In this talk, I will illustrate the relation between global properties and kpc-scale substructures of galaxies out to z∼2. Using combined high resolution data from the Hubble Space Telescope and long exposure spectroscopic observations with the Keck t ...
IDEA MAN
... interstellar gas could produce cosmic rays outside the supernova itself. Second, Baade and Zwicky tried to explain how such titanic explosions could occur at all. Then as now, any reasonable theory had to involve gravitational collapse. However, a simple calculation showed that the collapsing progen ...
... interstellar gas could produce cosmic rays outside the supernova itself. Second, Baade and Zwicky tried to explain how such titanic explosions could occur at all. Then as now, any reasonable theory had to involve gravitational collapse. However, a simple calculation showed that the collapsing progen ...
Infrared Astronomy
... USA (Hinson 2009, http://www.nbca.org/Wildlife/New_Pictures.htm) Humans at normal body temperature, radiate most strongly in the infrared, which is definitely not seen by human eyes. The scientific discovery that the heat we all feel coming from the Sun is largely a radiation beyond the visible red ...
... USA (Hinson 2009, http://www.nbca.org/Wildlife/New_Pictures.htm) Humans at normal body temperature, radiate most strongly in the infrared, which is definitely not seen by human eyes. The scientific discovery that the heat we all feel coming from the Sun is largely a radiation beyond the visible red ...
The dark matter crisis: falsification of the current standard model of
... scales. This is a vast extrapolation by many orders of magnitude from the well-tested scale of planetary dynamics to the galactic and cosmological ultra-weakfield scales, the dynamics of which were probed (Rubin & Ford 1970) only long after GR had been finalised by Einstein using Newtonian, i.e. essen ...
... scales. This is a vast extrapolation by many orders of magnitude from the well-tested scale of planetary dynamics to the galactic and cosmological ultra-weakfield scales, the dynamics of which were probed (Rubin & Ford 1970) only long after GR had been finalised by Einstein using Newtonian, i.e. essen ...
The KMOS Redshift One Spectroscopic Survey
... high redshift galaxies with much greater efficiency. KMOS allows for simultaneous observations with up to 24 IFUs within a 7.2 arcminute diameter radius and is thus perfectly suited to such a task. The KMOS Redshift One Spectroscopic Survey (KROSS) is a European Southern Observatory (ESO) guaranteed ...
... high redshift galaxies with much greater efficiency. KMOS allows for simultaneous observations with up to 24 IFUs within a 7.2 arcminute diameter radius and is thus perfectly suited to such a task. The KMOS Redshift One Spectroscopic Survey (KROSS) is a European Southern Observatory (ESO) guaranteed ...
The Upper Atmospheric Fountain Effect in the Polar
... characteristics (with CHAMP) and the ionospheric parameters (with EISCAT incoherent scatter radar facilities). As a result, the Pedersen conductivity was found to peak at 140 km altitude, i.e. above the E region as it would have been expected for typical E region Joule heating. Joule heating has bee ...
... characteristics (with CHAMP) and the ionospheric parameters (with EISCAT incoherent scatter radar facilities). As a result, the Pedersen conductivity was found to peak at 140 km altitude, i.e. above the E region as it would have been expected for typical E region Joule heating. Joule heating has bee ...
Outer space
Outer space, or just space, is the void that exists between celestial bodies, including the Earth. It is not completely empty, but consists of a hard vacuum containing a low density of particles, predominantly a plasma of hydrogen and helium as well as electromagnetic radiation, magnetic fields, neutrinos, dust and cosmic rays. The baseline temperature, as set by the background radiation from the Big Bang, is 2.7 kelvin (K). Plasma with a number density of less than one hydrogen atom per cubic metre and a temperature of millions of kelvin in the space between galaxies accounts for most of the baryonic (ordinary) matter in outer space; local concentrations have condensed into stars and galaxies. In most galaxies, observations provide evidence that 90% of the mass is in an unknown form, called dark matter, which interacts with other matter through gravitational but not electromagnetic forces. Data indicates that the majority of the mass-energy in the observable Universe is a poorly understood vacuum energy of space which astronomers label dark energy. Intergalactic space takes up most of the volume of the Universe, but even galaxies and star systems consist almost entirely of empty space.There is no firm boundary where space begins. However the Kármán line, at an altitude of 100 km (62 mi) above sea level, is conventionally used as the start of outer space in space treaties and for aerospace records keeping. The framework for international space law was established by the Outer Space Treaty, which was passed by the United Nations in 1967. This treaty precludes any claims of national sovereignty and permits all states to freely explore outer space. Despite the drafting of UN resolutions for the peaceful uses of outer space, anti-satellite weapons have been tested in Earth orbit.Humans began the physical exploration of space during the 20th century with the advent of high-altitude balloon flights, followed by manned rocket launches. Earth orbit was first achieved by Yuri Gagarin of the Soviet Union in 1961 and unmanned spacecraft have since reached all of the known planets in the Solar System. Due to the high cost of getting into space, manned spaceflight has been limited to low Earth orbit and the Moon.Outer space represents a challenging environment for human exploration because of the dual hazards of vacuum and radiation. Microgravity also has a negative effect on human physiology that causes both muscle atrophy and bone loss. In addition to these health and environmental issues, the economic cost of putting objects, including humans, into space is high.