Modeling Spatially and Spectrally Resolved Observations to
... advice on life, computers, and astronomy. I thank Diego Muñoz, Robert Harris, Ragnhild Lunnan, and Sarah Rugheimer for countless snack and coffee breaks; Wen-fai Fong and Nick Stone for leading camping trips and throwing amazing parties; and all of my fellow CfA students for their friendship over t ...
... advice on life, computers, and astronomy. I thank Diego Muñoz, Robert Harris, Ragnhild Lunnan, and Sarah Rugheimer for countless snack and coffee breaks; Wen-fai Fong and Nick Stone for leading camping trips and throwing amazing parties; and all of my fellow CfA students for their friendship over t ...
Harikane
... high significance levels. • Systemic redshift is z=1.1800±0.0002 • These lines appear to have two Harikane+14 components. ...
... high significance levels. • Systemic redshift is z=1.1800±0.0002 • These lines appear to have two Harikane+14 components. ...
The Physical Origins of The Morphology
... prefer dense environments. Perhaps contrary to expectation, the listed evidence does not rule out gas stripping as an explanation for the MDR. One should distinguish between the S0 population as a whole, and those galaxies that have been affected by environmental processes, giving rise to the MDR. I ...
... prefer dense environments. Perhaps contrary to expectation, the listed evidence does not rule out gas stripping as an explanation for the MDR. One should distinguish between the S0 population as a whole, and those galaxies that have been affected by environmental processes, giving rise to the MDR. I ...
Galaxy morphology, luminosity, and environment in the SDSS DR7
... Aims. We study the influence of the environment on the evolution of galaxies by investigating the luminosity function (LF) of galaxies of different morphological types and colours at different environmental density levels. Methods. We construct the LFs separately for galaxies of different morphology (s ...
... Aims. We study the influence of the environment on the evolution of galaxies by investigating the luminosity function (LF) of galaxies of different morphological types and colours at different environmental density levels. Methods. We construct the LFs separately for galaxies of different morphology (s ...
A SPECTROSCOPIC STUDY OF A LARGE SAMPLE OF WOLF-RAYET GALAXIES
... λ5808 region. Several other lower intensity WR emission lines are also seen. Table 1 lists the studied galaxies with their IAU names, coordinates α, δ at the 1950.0 epoch, apparent magnitudes mpg from Markarian et al. (1989) and Zwicky et al. (1961–1968), absolute magnitudes Mpg ( a Hubble constant ...
... λ5808 region. Several other lower intensity WR emission lines are also seen. Table 1 lists the studied galaxies with their IAU names, coordinates α, δ at the 1950.0 epoch, apparent magnitudes mpg from Markarian et al. (1989) and Zwicky et al. (1961–1968), absolute magnitudes Mpg ( a Hubble constant ...
Hubble 2006: Science Year in Review
... The final servicing mission in 2008 will install two new instruments, the Cosmic Origins Spectrograph (COS) and Wide Field Camera 3 (WFC3). COS is the most sensitive ultraviolet spectrograph ever built for Hubble. The instrument will probe the cosmic web—the large-scale structure of the universe—who ...
... The final servicing mission in 2008 will install two new instruments, the Cosmic Origins Spectrograph (COS) and Wide Field Camera 3 (WFC3). COS is the most sensitive ultraviolet spectrograph ever built for Hubble. The instrument will probe the cosmic web—the large-scale structure of the universe—who ...
Evidence of suppression of star formation by quasar
... 2014; Choi et al. 2015; Smethurst et al. 2015; Remus et al. 2016). These models invoke finding solutions for the so-called overcooling problem, where gas clouds cool too quickly and star formation happens too early (Silk et al. 2013). If the gas had cooled at such a high rate as initially predicted ...
... 2014; Choi et al. 2015; Smethurst et al. 2015; Remus et al. 2016). These models invoke finding solutions for the so-called overcooling problem, where gas clouds cool too quickly and star formation happens too early (Silk et al. 2013). If the gas had cooled at such a high rate as initially predicted ...
Global structure and kinematics of stellar haloes in cosmological
... Mpc in radius) extracted from the Millennium Simulation (Springel et al. 2005). The regions were picked to have overdensities at z = 1.5 of (+2, +1, 0, −1, −2)σ, where σ is the root-mean-square deviation from the mean on this spatial scale. The 5 spheres are therefore environmentally diverse in term ...
... Mpc in radius) extracted from the Millennium Simulation (Springel et al. 2005). The regions were picked to have overdensities at z = 1.5 of (+2, +1, 0, −1, −2)σ, where σ is the root-mean-square deviation from the mean on this spatial scale. The 5 spheres are therefore environmentally diverse in term ...
Catalogues of isolated galaxies, isolated pairs, and isolated triplets
... tailed studies of smaller samples (Morgan et al. 1998; Márquez & Moles 1999; Varela et al. 2004). With the advent of new digital data, the estimation of the fraction of isolated galaxies has been a topic of growing interest (Allam et al. 2005; Elyiv et al. 2009; Karachentsev et al. 2010; Karachents ...
... tailed studies of smaller samples (Morgan et al. 1998; Márquez & Moles 1999; Varela et al. 2004). With the advent of new digital data, the estimation of the fraction of isolated galaxies has been a topic of growing interest (Allam et al. 2005; Elyiv et al. 2009; Karachentsev et al. 2010; Karachents ...
THE GREAT AGN DEBATE `AGN VS STARBURST
... Edwin Salpeter published a paper describing how a massive object would accrete materiel from the ISM and the resultant release of energy. The term ‘black hole’ wasn’t coined until 1967, by physicist John Wheeler who claims he picked up the term from anther person. 13. The discovery of pulsars by Joc ...
... Edwin Salpeter published a paper describing how a massive object would accrete materiel from the ISM and the resultant release of energy. The term ‘black hole’ wasn’t coined until 1967, by physicist John Wheeler who claims he picked up the term from anther person. 13. The discovery of pulsars by Joc ...
Properties of simulated Milky Way-mass galaxies in loose group and
... is a three-dimensional Eulerian hydrodynamical code with an N-body particle-mesh scheme to compute self-gravity. The mesh automatically refines according to the local particle density in addition to a static refinement of nested regions that reduces the run-time while maintaining high resolution aro ...
... is a three-dimensional Eulerian hydrodynamical code with an N-body particle-mesh scheme to compute self-gravity. The mesh automatically refines according to the local particle density in addition to a static refinement of nested regions that reduces the run-time while maintaining high resolution aro ...
MUFASA: The assembly of the red sequence
... forming red sequence elliptical galaxies may be more complex than canonically believed. Models that aim to explain massive galaxy formation must reproduce all these subtle facets of the observed galaxy population. Stringent constraints on models are already provided by the detailed observed properti ...
... forming red sequence elliptical galaxies may be more complex than canonically believed. Models that aim to explain massive galaxy formation must reproduce all these subtle facets of the observed galaxy population. Stringent constraints on models are already provided by the detailed observed properti ...
View/Open - University of Hertfordshire
... distinguish between members of NGC 6822 and foreground stars in the Milky Way and that the analysis tools available could be used to obtain useful velocity results from the spectra. This led to the discovery of a rotating population of intermediate age stars in the halo of NGC 6822, which constitute ...
... distinguish between members of NGC 6822 and foreground stars in the Milky Way and that the analysis tools available could be used to obtain useful velocity results from the spectra. This led to the discovery of a rotating population of intermediate age stars in the halo of NGC 6822, which constitute ...
Annual Report 2012 - Max Planck Institute for Astrophysics
... directorship of Ludwig Biermann. It was first es- institution of similar size. tablished as an offshoot of the Max-Planck-Institut In recent years, activities at the MPA have difür Physik, which at that time had just moved from versified. They now address a much broader range Göttingen to Munich. In 19 ...
... directorship of Ludwig Biermann. It was first es- institution of similar size. tablished as an offshoot of the Max-Planck-Institut In recent years, activities at the MPA have difür Physik, which at that time had just moved from versified. They now address a much broader range Göttingen to Munich. In 19 ...
Giant Low Surface Brightness Galaxies
... properties such as extended HI disks, confirm that they are extreme late type spirals. The really large LSB galaxies are usually referred to as Giant LSB (GLSB) galaxies and are generally isolated systems (Bothun et al. 1993). They are found to lie closer to the walls of voids (Rosenbaum et al. 2009 ...
... properties such as extended HI disks, confirm that they are extreme late type spirals. The really large LSB galaxies are usually referred to as Giant LSB (GLSB) galaxies and are generally isolated systems (Bothun et al. 1993). They are found to lie closer to the walls of voids (Rosenbaum et al. 2009 ...
Preliminary Talk Abstract Book - MoCA
... Galactic winds are necessary to reduce the star formation rate in simulated galaxies to match observations. However, these outflows can be so violent that they completely destroy the gas disc. Maintaining a gas disc for a sufficiently long time in order to form a stellar disc thus becomes difficult. ...
... Galactic winds are necessary to reduce the star formation rate in simulated galaxies to match observations. However, these outflows can be so violent that they completely destroy the gas disc. Maintaining a gas disc for a sufficiently long time in order to form a stellar disc thus becomes difficult. ...
FIELD GALAXIES AND THEIR AGNs: NATURE VERSUS
... the hot mode dominates above it) is close to the observed characteristic mass for a shift in galaxy properties, Mgal ∼ 3 × 1010 M¯ (Kauffmann et al. 2004, Kannappan 2004). Galaxies below the critical mass of Mgal ∼ 3 × 1010 M¯ have larger star formation rate, young/blue stars, large gas amounts, and ...
... the hot mode dominates above it) is close to the observed characteristic mass for a shift in galaxy properties, Mgal ∼ 3 × 1010 M¯ (Kauffmann et al. 2004, Kannappan 2004). Galaxies below the critical mass of Mgal ∼ 3 × 1010 M¯ have larger star formation rate, young/blue stars, large gas amounts, and ...
Redshift
In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum. In general, whether or not the radiation is within the visible spectrum, ""redder"" means an increase in wavelength – equivalent to a lower frequency and a lower photon energy, in accordance with, respectively, the wave and quantum theories of light.Some redshifts are an example of the Doppler effect, familiar in the change of apparent pitches of sirens and frequency of the sound waves emitted by speeding vehicles. A redshift occurs whenever a light source moves away from an observer. Another kind of redshift is cosmological redshift, which is due to the expansion of the universe, and sufficiently distant light sources (generally more than a few million light years away) show redshift corresponding to the rate of increase in their distance from Earth. Finally, gravitational redshift is a relativistic effect observed in electromagnetic radiation moving out of gravitational fields. Conversely, a decrease in wavelength is called blueshift and is generally seen when a light-emitting object moves toward an observer or when electromagnetic radiation moves into a gravitational field. However, redshift is a more common term and sometimes blueshift is referred to as negative redshift.Knowledge of redshifts and blueshifts has been applied to develop several terrestrial technologies such as Doppler radar and radar guns. Redshifts are also seen in the spectroscopic observations of astronomical objects. Its value is represented by the letter z.A special relativistic redshift formula (and its classical approximation) can be used to calculate the redshift of a nearby object when spacetime is flat. However, in many contexts, such as black holes and Big Bang cosmology, redshifts must be calculated using general relativity. Special relativistic, gravitational, and cosmological redshifts can be understood under the umbrella of frame transformation laws. There exist other physical processes that can lead to a shift in the frequency of electromagnetic radiation, including scattering and optical effects; however, the resulting changes are distinguishable from true redshift and are not generally referred to as such (see section on physical optics and radiative transfer).