The Evolution of Star Formation Activity in . Cory R. Wagner
... In this thesis, we explore 7.5 billion years of evolution in cluster galaxy star formation activity using a sample of 11 high-redshift (1 < z < 1.5) clusters from the IRAC Shallow Cluster Survey, and 25 low-redshift (0.15 < z < 1) clusters from The Cluster Lensing And Supernova survey with Hubble. W ...
... In this thesis, we explore 7.5 billion years of evolution in cluster galaxy star formation activity using a sample of 11 high-redshift (1 < z < 1.5) clusters from the IRAC Shallow Cluster Survey, and 25 low-redshift (0.15 < z < 1) clusters from The Cluster Lensing And Supernova survey with Hubble. W ...
Celestial Object Imaging Model and Parameter Optimization for an
... New image sensor designs are also proposed to attain an extended dynamic range. The photocurrent in logarithmic response image sensors is fed to a resistor with a logarithmic current-voltage characteristic [8–10]. Logarithmic-response image sensors can obtain a wide dynamic range, but it has several ...
... New image sensor designs are also proposed to attain an extended dynamic range. The photocurrent in logarithmic response image sensors is fed to a resistor with a logarithmic current-voltage characteristic [8–10]. Logarithmic-response image sensors can obtain a wide dynamic range, but it has several ...
Ionization in atmospheres of Brown Dwarfs and extrasolar planets IV
... the more detailed models for the Martian exosphere (Galli et al. 2006). Galli et al. (2006) provide an analytic form of the density profile for the Martian exosphere, and compare it to observation. We are not aware of a more recent analytic expression for exospheric densities that is compared to obs ...
... the more detailed models for the Martian exosphere (Galli et al. 2006). Galli et al. (2006) provide an analytic form of the density profile for the Martian exosphere, and compare it to observation. We are not aware of a more recent analytic expression for exospheric densities that is compared to obs ...
The Distribution, Classification, and Color Evolution of Galaxies
... Figure 2.16: Histogram of Galaxy Populations. Ellipticals, starforming, and non-starforming spirals have different population distributions for different SDSS colors ....................................................................... 19 Figure 4.1: Number Fraction-Redshift Relation of Galaxies . ...
... Figure 2.16: Histogram of Galaxy Populations. Ellipticals, starforming, and non-starforming spirals have different population distributions for different SDSS colors ....................................................................... 19 Figure 4.1: Number Fraction-Redshift Relation of Galaxies . ...
arXiv:astro-ph/0701485v3 15 Jun 2010
... caused by an Earth-radius planet orbiting a Solartype star, though independent confirmation of the planetary origin of such a signal will be challenging. Detection of small planets via transits from the ground is also possible, by focusing on low mass stars which have smaller physical radii (Charbon ...
... caused by an Earth-radius planet orbiting a Solartype star, though independent confirmation of the planetary origin of such a signal will be challenging. Detection of small planets via transits from the ground is also possible, by focusing on low mass stars which have smaller physical radii (Charbon ...
Planet Formation in the Outer Solar System
... 2000). The thermal velocity of this gas is large enough to overcome the local gravity beyond ∼10 AU for a 1 M, central star. Material then leaves the disk, producing a bipolar outflow that may be observed in nearby star-forming regions (Bally et al. 1998; Johnstone, Hollenbach, & Bally 1998). Disk e ...
... 2000). The thermal velocity of this gas is large enough to overcome the local gravity beyond ∼10 AU for a 1 M, central star. Material then leaves the disk, producing a bipolar outflow that may be observed in nearby star-forming regions (Bally et al. 1998; Johnstone, Hollenbach, & Bally 1998). Disk e ...
potenza dei jet nei nuclei galattici attivi radio
... Figure 1.1: A schematic representation of an AGN’s Spectral Energy Distribution (SED), loosely based on the observed SEDs of radio-quiet quasars. The black solid curve represents the total SED and the various coloured curves (with an arbitrary offset) represent the individual components. The SED of ...
... Figure 1.1: A schematic representation of an AGN’s Spectral Energy Distribution (SED), loosely based on the observed SEDs of radio-quiet quasars. The black solid curve represents the total SED and the various coloured curves (with an arbitrary offset) represent the individual components. The SED of ...
Brightest Stars : Discovering the Universe Through the Sky`s Most
... star’s environment of season and constellations, of earth and the sky. Each profile also offers the lore and legends connected with the star, for these are a measure of what the human race as a whole has found interesting and individual about the star. A key part of each profile, of course, is also ...
... star’s environment of season and constellations, of earth and the sky. Each profile also offers the lore and legends connected with the star, for these are a measure of what the human race as a whole has found interesting and individual about the star. A key part of each profile, of course, is also ...
Molecular Gas in the Large Magellanic Cloud
... At the Centre for Astrophysics and Supercomputing, I am especially grateful to Matthew Bailes, who convinced me to move to Melbourne and introduced me to astronomy research while I was still a first-year undergraduate. The Centre will be hard-pressed to find a Director who promotes and advocates for s ...
... At the Centre for Astrophysics and Supercomputing, I am especially grateful to Matthew Bailes, who convinced me to move to Melbourne and introduced me to astronomy research while I was still a first-year undergraduate. The Centre will be hard-pressed to find a Director who promotes and advocates for s ...
Galaxy Evolution Over the Past Eleven Billion Years: Mergers and
... only visible at near-infrared wavelengths, was discovered. They were previously overlooked, since they are invisible even in the deepest Hubble Space Telescope (HST) optical surveys. Their stellar populations, characterized using deep near-infrared photometric and spectroscopic observations, reveal ...
... only visible at near-infrared wavelengths, was discovered. They were previously overlooked, since they are invisible even in the deepest Hubble Space Telescope (HST) optical surveys. Their stellar populations, characterized using deep near-infrared photometric and spectroscopic observations, reveal ...
An Improved Distance and Mass Estimate for Sgr A* from a Multistar
... of speckle imaging data. In this work, we present a method to increase the orbital phase coverage of these faint stars at the Galactic Center through a complete reanalysis of this data set. In all past analyses of stellar orbital parameters using the speckle data, the data from each observation run ...
... of speckle imaging data. In this work, we present a method to increase the orbital phase coverage of these faint stars at the Galactic Center through a complete reanalysis of this data set. In all past analyses of stellar orbital parameters using the speckle data, the data from each observation run ...
Models for circumstellar nebulae around red and blue supergiants
... Classification and evolution Stars spend most of their life in the Main Sequence (MS). In this stage of their evolution the source of energy production is the fusion of hydrogen into helium in their core. This energy escapes from the star in the form of radiation and, to a minor fraction, in the for ...
... Classification and evolution Stars spend most of their life in the Main Sequence (MS). In this stage of their evolution the source of energy production is the fusion of hydrogen into helium in their core. This energy escapes from the star in the form of radiation and, to a minor fraction, in the for ...
diy astronomy - American Museum of Natural History
... Astronomical data are archived in large on-line databases; real images of any part of the sky can be easily obtained from the Internet. • Astrometry is a technique that astronomers use to measure the position or change in position of objects in the sky. They can use it to calculate how fast stars m ...
... Astronomical data are archived in large on-line databases; real images of any part of the sky can be easily obtained from the Internet. • Astrometry is a technique that astronomers use to measure the position or change in position of objects in the sky. They can use it to calculate how fast stars m ...
White dwarf dynamical interactions and fast optical transients
... double white dwarf binary system where the components are brought together by gravitational wave radiation, or it could be triggered by a stellar close encounter, perhaps prompted by Kozai oscillations in a triple system (Thompson 2011; Katz & Dong 2012; Antognini et al. 2014) — see Sect. 2. In eith ...
... double white dwarf binary system where the components are brought together by gravitational wave radiation, or it could be triggered by a stellar close encounter, perhaps prompted by Kozai oscillations in a triple system (Thompson 2011; Katz & Dong 2012; Antognini et al. 2014) — see Sect. 2. In eith ...
- Durham Research Online
... are depleted of their cold and hot gas as they enter the virialized regions of relatively small groups (e.g., Kawata & Mulchaey 2008; Feldmann et al. 2011). Peng et al. (2012) have argued that many of the key evolutionary processes on satellites, namely, the specific star formation rates (i.e., SFR/ ...
... are depleted of their cold and hot gas as they enter the virialized regions of relatively small groups (e.g., Kawata & Mulchaey 2008; Feldmann et al. 2011). Peng et al. (2012) have argued that many of the key evolutionary processes on satellites, namely, the specific star formation rates (i.e., SFR/ ...
Abstract Title of Dissertation: BLACK HOLE DYNAMICS AND GRAVITATIONAL RADIATION IN GALACTIC NUCLEI
... sources and the instruments that could detect them. Ground-based detectors operate at the high frequency end, and are sensitive to coalescing neutron stars, black holes, and, possibly, collapsing stars and rotating neutron stars. Spacebased detectors operate at lower frequencies where extragalactic ...
... sources and the instruments that could detect them. Ground-based detectors operate at the high frequency end, and are sensitive to coalescing neutron stars, black holes, and, possibly, collapsing stars and rotating neutron stars. Spacebased detectors operate at lower frequencies where extragalactic ...
Asteroseismic Modelling of Solar-like Stars
... are highly determined by the global stellar properties and the inner structure of the stars, asteroseimology is a perfect tool to test our current understanding of stars. With the acquisition of high quality oscillation data, the theories of stellar structure and evolution and theories of stellar pu ...
... are highly determined by the global stellar properties and the inner structure of the stars, asteroseimology is a perfect tool to test our current understanding of stars. With the acquisition of high quality oscillation data, the theories of stellar structure and evolution and theories of stellar pu ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.