The Evolution of the Mass-Size relation to z = 3.5 in the GOODS
... have smaller half-light radii. Their “norm optical sizes are thus perhaps not strong galaxies between 10 < log(M ...
... have smaller half-light radii. Their “norm optical sizes are thus perhaps not strong galaxies between 10 < log(M ...
Galaxy morphology, luminosity, and environment in the SDSS DR7
... most accurate, but by far the most time consuming approach is to use visual classification (Marzke et al. 1994, 1998; Kochanek et al. 2001; Cuesta-Bolao & Serna 2003; Nakamura et al. 2003). For the SDSS survey, visual classification has become possible thanks to the Galaxy Zoo project (Lintott et al ...
... most accurate, but by far the most time consuming approach is to use visual classification (Marzke et al. 1994, 1998; Kochanek et al. 2001; Cuesta-Bolao & Serna 2003; Nakamura et al. 2003). For the SDSS survey, visual classification has become possible thanks to the Galaxy Zoo project (Lintott et al ...
Observational Studies of Interacting Galaxies and the Development
... through five CFHTLS broad band photometry up to z ∼ 1. Meanwhile, by comparing the merger and elliptical galaxy mass density function, I discovered that the most massive mergers are not all formed via merging processes, unless the merging timescale is much longer than the expected value. Spectroscop ...
... through five CFHTLS broad band photometry up to z ∼ 1. Meanwhile, by comparing the merger and elliptical galaxy mass density function, I discovered that the most massive mergers are not all formed via merging processes, unless the merging timescale is much longer than the expected value. Spectroscop ...
Chapter 5 The Evolutionary Paths Of Nearby Galaxies
... since z∼1, the stellar mass density of the red sequence has increased by at least a factor ∼2, while surprisingly the stellar mass density of the blue cloud has remained ...
... since z∼1, the stellar mass density of the red sequence has increased by at least a factor ∼2, while surprisingly the stellar mass density of the blue cloud has remained ...
- Max-Planck-Institut für Astronomie
... We have used the 28 ; 28 Hubble Space Telescope image mosaic from the GEMS (Galaxy Evolution from Morphology and SEDs) survey in conjunction with the COMBO-17 photometric redshift survey to constrain the incidence of major mergers between spheroid-dominated galaxies with little cold gas (dry mergers ...
... We have used the 28 ; 28 Hubble Space Telescope image mosaic from the GEMS (Galaxy Evolution from Morphology and SEDs) survey in conjunction with the COMBO-17 photometric redshift survey to constrain the incidence of major mergers between spheroid-dominated galaxies with little cold gas (dry mergers ...
The impact of protocluster environments at z = 1.6
... provided in Hatch et al. (2016) which we summarize here. A K-selected UBVRi z JHK[3.6][4.5] catalogue of the galaxies around Cl 0218.3−0510 was created by Hartley et al. (2013) as part of the eighth data release of the near-infrared UKIDSS Ultra Deep Survey (UDS). We supplemented this photometry w ...
... provided in Hatch et al. (2016) which we summarize here. A K-selected UBVRi z JHK[3.6][4.5] catalogue of the galaxies around Cl 0218.3−0510 was created by Hartley et al. (2013) as part of the eighth data release of the near-infrared UKIDSS Ultra Deep Survey (UDS). We supplemented this photometry w ...
Annual Report 2011 - Max Planck Institute for Astrophysics
... quickly repaired by a complete exchange of the computer. In addition to the desktop systems, which, are almost all younger than 5 years and which (in 2011) amount to more than 160 fully equipped working places, users have access to central number crunchers (about 20 machines, all 64-bit architecture ...
... quickly repaired by a complete exchange of the computer. In addition to the desktop systems, which, are almost all younger than 5 years and which (in 2011) amount to more than 160 fully equipped working places, users have access to central number crunchers (about 20 machines, all 64-bit architecture ...
Worlds Beyond The Poles
... This is reality; it is truth stranger than any fiction the world has known: There is no physical end to the Earth’s northern and southern extent. The Earth merges with land areas of the universe about us that exist straight ahead beyond the North Pole and the South Pole “points” of theory. It is now ...
... This is reality; it is truth stranger than any fiction the world has known: There is no physical end to the Earth’s northern and southern extent. The Earth merges with land areas of the universe about us that exist straight ahead beyond the North Pole and the South Pole “points” of theory. It is now ...
The visibility of Lyman Alpha Emitters: constraining reionization
... GADGET-2 to obtain the physical properties of z ≃ 5.7 galaxies, (b) a dust model that took into account the entire star formation history of each galaxy to calculate its dust enrichment and, (c) a RT code (CRASH) to obtain the ionization fields to calculate the IGM Lyα transmission for each galaxy, ...
... GADGET-2 to obtain the physical properties of z ≃ 5.7 galaxies, (b) a dust model that took into account the entire star formation history of each galaxy to calculate its dust enrichment and, (c) a RT code (CRASH) to obtain the ionization fields to calculate the IGM Lyα transmission for each galaxy, ...
Galaxies
... model of galaxy evolution and cosmology based on the paradigm that galaxies form hierarchically around peaks in the dark matter density distribution. Within this framework, astronomers have made great progress in understanding the large-scale clustering of galaxies, as biased tracers of the underlyi ...
... model of galaxy evolution and cosmology based on the paradigm that galaxies form hierarchically around peaks in the dark matter density distribution. Within this framework, astronomers have made great progress in understanding the large-scale clustering of galaxies, as biased tracers of the underlyi ...
Spectacular Evidence of the Greatness of Almighty Allah
... contain many multiple star systems, star clusters, and various interstellar clouds. Most galaxies are 1,000 to 100,000 parsecs in diameter. The parsec measurement unit is used in astronomy. The parsec is a unit of length, equal to just under 31 trillion kilometers (about 19 trillion miles), or about ...
... contain many multiple star systems, star clusters, and various interstellar clouds. Most galaxies are 1,000 to 100,000 parsecs in diameter. The parsec measurement unit is used in astronomy. The parsec is a unit of length, equal to just under 31 trillion kilometers (about 19 trillion miles), or about ...
Discovery of a Dwarf Poststarburst Galaxy near a High Column
... between most (78%) Ly absorbers and larger scale galaxy filamentary structures; the remaining 22% of these absorbers were found in galaxy ‘‘voids’’ (McLin et al. 2002; Paper III). These latter results have suggested to some investigators (including the current authors) that the proximity of high c ...
... between most (78%) Ly absorbers and larger scale galaxy filamentary structures; the remaining 22% of these absorbers were found in galaxy ‘‘voids’’ (McLin et al. 2002; Paper III). These latter results have suggested to some investigators (including the current authors) that the proximity of high c ...
2. The X-ray-Radio correlation for bulgeless galaxies
... the same regardless of the distance of the objects, so the luminosity limit is defined solely by the redshifts.......................................................................................................43 Table 2: Sensitivity limits for both C-COSMOS and VLA-COSMOS surveys. The flux sensi ...
... the same regardless of the distance of the objects, so the luminosity limit is defined solely by the redshifts.......................................................................................................43 Table 2: Sensitivity limits for both C-COSMOS and VLA-COSMOS surveys. The flux sensi ...
The Legacy of Galileo - Keck Institute for Space Studies
... no physical manifestation which the experience of sense sets before our eyes, or which necessary demonstrations prove to us, ought to be questioned (much less condemned) based upon biblical references whose words might appear to be leading to a different conclusion. For the Bible is not constrained ...
... no physical manifestation which the experience of sense sets before our eyes, or which necessary demonstrations prove to us, ought to be questioned (much less condemned) based upon biblical references whose words might appear to be leading to a different conclusion. For the Bible is not constrained ...
T3-Cosmic Star Formation History
... for m < 7 M , solar-metallicity stars have longer lifetimes than their metal-poor counterparts, whereas the opposite is true for m > 9 M .] So over the redshift range of interest here, the instantaneous recycling approximation may break down in the limited mass range 0.9 < m < 2.5 M . For illustr ...
... for m < 7 M , solar-metallicity stars have longer lifetimes than their metal-poor counterparts, whereas the opposite is true for m > 9 M .] So over the redshift range of interest here, the instantaneous recycling approximation may break down in the limited mass range 0.9 < m < 2.5 M . For illustr ...
Grand Design and Flocculent Spirals in the Spitzer Survey of Stellar
... galaxies with slowly rising rotation curves. These two cases are halo-dominated and diskdominated in the bar region, leading Athanassoula & Misiriotis (2002) to call them types “MH” and “MD,” respectively. Two bar types were also modeled by Athanassoula et al. (2009c) and compared to observations by ...
... galaxies with slowly rising rotation curves. These two cases are halo-dominated and diskdominated in the bar region, leading Athanassoula & Misiriotis (2002) to call them types “MH” and “MD,” respectively. Two bar types were also modeled by Athanassoula et al. (2009c) and compared to observations by ...
The Diffuse Interstellar Bands in History and in the UV
... In 1921, while Mary Lea Heger was making observations of “stationary” (i.e. interstellar) atomic sodium absorption lines in stellar spectra, she noted the presence of two broad features at 5780 and 5797 Å that appeared to be interstellar in origin (Heger 1922). Heger took little notice of these fea ...
... In 1921, while Mary Lea Heger was making observations of “stationary” (i.e. interstellar) atomic sodium absorption lines in stellar spectra, she noted the presence of two broad features at 5780 and 5797 Å that appeared to be interstellar in origin (Heger 1922). Heger took little notice of these fea ...
A Wide-Field Study of the z~ 0.8 Cluster RX J0152. 7
... properties over a broad range of local densities: from the high density cluster core to the intermediate density groups in the outskirts and the low density surrounding field. Furthermore, the findings of Holden et al. (2007) and van der Wel et al. (2007) suggest that the morphological makeup of gal ...
... properties over a broad range of local densities: from the high density cluster core to the intermediate density groups in the outskirts and the low density surrounding field. Furthermore, the findings of Holden et al. (2007) and van der Wel et al. (2007) suggest that the morphological makeup of gal ...
Astronomy 201 Cosmology
... • there is no freely falling frame of reference in which gravity vanishes globally • there is a freely falling frame of reference in which gravity vanishes locally • equivalence principle holds for small labs, “small” in comparison to distances over which the gravitational field changes ...
... • there is no freely falling frame of reference in which gravity vanishes globally • there is a freely falling frame of reference in which gravity vanishes locally • equivalence principle holds for small labs, “small” in comparison to distances over which the gravitational field changes ...
MERCURY In-flight calibration of the PHEBUS UV instrument and
... annoy the Earth-bound scientist with its weirdities, to its own pleasure. Yes, Mercury is extreme, mostly unexplored and very, very appealing. For as long as humans have looked to the sky, Mercury, despite its closeness to Earth, has always been neglected. This is understandable since it is drowned ...
... annoy the Earth-bound scientist with its weirdities, to its own pleasure. Yes, Mercury is extreme, mostly unexplored and very, very appealing. For as long as humans have looked to the sky, Mercury, despite its closeness to Earth, has always been neglected. This is understandable since it is drowned ...
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 ...
Annual Report 2014 - Max Planck Institute for Astrophysics
... particles, and the calculation of transition probThe Max-Planck-Institut für Astrophysik, usually abilities and cross–sections for astrophysical procalled MPA for short, was founded in 1958 under cesses in rarefied media. From its inception the the directorship of Ludwig Biermann. It was estab- MPA h ...
... particles, and the calculation of transition probThe Max-Planck-Institut für Astrophysik, usually abilities and cross–sections for astrophysical procalled MPA for short, was founded in 1958 under cesses in rarefied media. From its inception the the directorship of Ludwig Biermann. It was estab- MPA h ...
Physical Processes in the Interstellar Medium
... converging flows generate regions of high density. These localized enhancements can be sufficiently large for gravitational instability to set in. The subsequent evolution now depends on the competition between collapse and dispersal. The same random flows that create high-density regions in the fir ...
... converging flows generate regions of high density. These localized enhancements can be sufficiently large for gravitational instability to set in. The subsequent evolution now depends on the competition between collapse and dispersal. The same random flows that create high-density regions in the fir ...
FIELD GALAXIES AND THEIR AGNs: NATURE VERSUS
... etc.). Since first galaxies form very early, observational constrains are insufficient. Numerical simulations have a large problem because of the enormous dynamical range that has to be addressed simultaneously from ∼ 1 AU up to hundreds of kiloparsecs. It starts with recombination (the time at whic ...
... etc.). Since first galaxies form very early, observational constrains are insufficient. Numerical simulations have a large problem because of the enormous dynamical range that has to be addressed simultaneously from ∼ 1 AU up to hundreds of kiloparsecs. It starts with recombination (the time at whic ...
Extragalactic Astronomical Masers I
... envelopes of evolved stars and starforming regions range from 0.001 Lʘ to 1 Lʘ, typically. H2O maser with a luminosity well above 1 Lʘ has never been found in our Galaxy. H 2O masers observed in nearby starforming or starburst galaxies with Liso values of 0.01―1 solar luminosity (Churchwell et al. ...
... envelopes of evolved stars and starforming regions range from 0.001 Lʘ to 1 Lʘ, typically. H2O maser with a luminosity well above 1 Lʘ has never been found in our Galaxy. H 2O masers observed in nearby starforming or starburst galaxies with Liso values of 0.01―1 solar luminosity (Churchwell et al. ...
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.