Halo Substructure and the Power Spectrum
... In this proceeding, we present the results of a semi-analytic study of CDM substructure as a function of the primordial power spectrum. We apply our method to several “tilted” models in the ΛCDM framework, with n ≃ 1.1 − 0.8, or σ8 ≃ 1.2 − 0.65 when normalized to COBE. We also study a more extreme, ...
... In this proceeding, we present the results of a semi-analytic study of CDM substructure as a function of the primordial power spectrum. We apply our method to several “tilted” models in the ΛCDM framework, with n ≃ 1.1 − 0.8, or σ8 ≃ 1.2 − 0.65 when normalized to COBE. We also study a more extreme, ...
Substellar Objects in Nearby Young Clusters (SONYC) VI: The
... good conditions. The pre-images were reduced and calibrated using 2MASS photometry. Aperture magnitudes were measured for all our candidates, to complement and verify the available photometry. These pre-images are used to define the masks for the spectroscopy run, which was carried out in the night ...
... good conditions. The pre-images were reduced and calibrated using 2MASS photometry. Aperture magnitudes were measured for all our candidates, to complement and verify the available photometry. These pre-images are used to define the masks for the spectroscopy run, which was carried out in the night ...
Extraordinary Luminous Soft X-Ray Transient MAXI
... Figure 1. Images of MAXI J0158−744 taken by MAXI and Swift. (a) A part of the GSC all-sky image shown in Hammer-Aitoff projection of Galactic coordinates. Red, green, and blue color maps represent the intensities in 2–4, 4–10, and 10–20 keV bands, respectively. Grid lines are drawn every 1 hr and 10 ...
... Figure 1. Images of MAXI J0158−744 taken by MAXI and Swift. (a) A part of the GSC all-sky image shown in Hammer-Aitoff projection of Galactic coordinates. Red, green, and blue color maps represent the intensities in 2–4, 4–10, and 10–20 keV bands, respectively. Grid lines are drawn every 1 hr and 10 ...
Measuring the Masses of Neutron Stars
... spiral-in likely results in the removal of the envelope of the Be companion, and after the (second) supernova a bound (or disrupted) double neutron star remains, like the Hulse-Taylor binary pulsar PSR 1913+16 (or a neutron star – white dwarf system, if the mass of the Be companion is less than 8 M ...
... spiral-in likely results in the removal of the envelope of the Be companion, and after the (second) supernova a bound (or disrupted) double neutron star remains, like the Hulse-Taylor binary pulsar PSR 1913+16 (or a neutron star – white dwarf system, if the mass of the Be companion is less than 8 M ...
Two-dimensional control of light with light on metasurfaces
... enhanced to negligible light-matter interaction. We detect the resulting coherent effects by imaging the metasurface onto a CCD camera, detecting output beam C that is formed by transmission of beam A and reflection of beam B. We note that less-than-ideal absorption in our sample reduces the achievab ...
... enhanced to negligible light-matter interaction. We detect the resulting coherent effects by imaging the metasurface onto a CCD camera, detecting output beam C that is formed by transmission of beam A and reflection of beam B. We note that less-than-ideal absorption in our sample reduces the achievab ...
Picosecond Flash Photolysis of Carbonyl Complexes ... Ruthenium(II} Porphyrin Cation Radicals
... 1r cation radicals Ru(OEP+·)CO(L): L = EtOH (4a). py (4b). 1m (4c). Br- (4d). Excitation with 35-ps flashes at 532 nm results in the formation and decay of transient states having lifetimes less than the flash duration. The transient lifetimes for 2A!u ground-state 1r cation radicals are shorter tha ...
... 1r cation radicals Ru(OEP+·)CO(L): L = EtOH (4a). py (4b). 1m (4c). Br- (4d). Excitation with 35-ps flashes at 532 nm results in the formation and decay of transient states having lifetimes less than the flash duration. The transient lifetimes for 2A!u ground-state 1r cation radicals are shorter tha ...
Essential Question
... Essential Question: How do scientists think our universe was created and what evidence supports it? Big Bang Theory • All galaxies started from one huge mass of densely packed matter • The densely packed matter exploded with a “big bang” sending out matter and energy in all directions • Over time th ...
... Essential Question: How do scientists think our universe was created and what evidence supports it? Big Bang Theory • All galaxies started from one huge mass of densely packed matter • The densely packed matter exploded with a “big bang” sending out matter and energy in all directions • Over time th ...
Chapter-by-Chapter Guide
... Most of the atoms in our bodies (all the elements except for hydrogen, since our bodies generally do not contain helium) were made by stars well after the Big Bang. So most of what makes up our bodies was once part of stars. Light travels at 300,000 kilometers per second. A light-year is the distanc ...
... Most of the atoms in our bodies (all the elements except for hydrogen, since our bodies generally do not contain helium) were made by stars well after the Big Bang. So most of what makes up our bodies was once part of stars. Light travels at 300,000 kilometers per second. A light-year is the distanc ...
A CHANDRA X-RAY STUDY OF THE DENSE GLOBULAR CLUSTER TERZAN... C. O. Heinke, P. D. Edmonds, J. E. Grindlay, and...
... 2.2. Detection and Astrometry We used the CIAO software package3 to search for point sources, produce hardness ratios, and extract spectra and light curves. We reprocessed the two observations to remove the pixel randomization added in standard processing and merged the two observations. No periods ...
... 2.2. Detection and Astrometry We used the CIAO software package3 to search for point sources, produce hardness ratios, and extract spectra and light curves. We reprocessed the two observations to remove the pixel randomization added in standard processing and merged the two observations. No periods ...
Local Horizon View
... latitude, the pole star is at altitude 45 degrees as shown to the right. We can see that when we look up. This diagram shows that the altitude of Polaris above the horizon is the same as the observer's latitude. Note that the lines drawn to Polaris are parallel because Polaris is very far away. The ...
... latitude, the pole star is at altitude 45 degrees as shown to the right. We can see that when we look up. This diagram shows that the altitude of Polaris above the horizon is the same as the observer's latitude. Note that the lines drawn to Polaris are parallel because Polaris is very far away. The ...
Mimicking celestial mechanics in metamaterials ARTICLES *
... both the group velocity and wavelength, which in turns gives rise to exceptionally high local energy densities. Although the singularity in the refractive index profile of the ideal PBH is of fundamental interest for science, it is probably not feasible in practice. Such index profiles or the associ ...
... both the group velocity and wavelength, which in turns gives rise to exceptionally high local energy densities. Although the singularity in the refractive index profile of the ideal PBH is of fundamental interest for science, it is probably not feasible in practice. Such index profiles or the associ ...
Title The molecular envelope around the red supergiant VY CMa
... beam is 5400 . The shortest projected baseline being 8 m, we may loose information on structures larger than 4000 . Nevertheless, the resulting coverage of the uv-plane is rather scarce until 18 m. We may therefore also miss part of the emission associated with structures larger than 1800 , although ...
... beam is 5400 . The shortest projected baseline being 8 m, we may loose information on structures larger than 4000 . Nevertheless, the resulting coverage of the uv-plane is rather scarce until 18 m. We may therefore also miss part of the emission associated with structures larger than 1800 , although ...
Session 1: Stellar winds, diagnostics across the electromagnetic
... Detectable radio emission occurs during all phases of massive star evolution.I will concentrate on the thermal and non-thermal continuum emission from early-type stars. The thermal radio emission is due to free-free interactions in the ionized stellar wind material. Early ideas that this would lead ...
... Detectable radio emission occurs during all phases of massive star evolution.I will concentrate on the thermal and non-thermal continuum emission from early-type stars. The thermal radio emission is due to free-free interactions in the ionized stellar wind material. Early ideas that this would lead ...
Plasma Physics and Pulsars 2 - Max Planck Institut für
... they enter the dwarf stage. Our Sun for example, is 4.5 × 109 years old and is expected to live another 7.5 × 109 years before collapsing to a white dwarf. Stars above eight solar masses evolve more rapidly: Additionally the thermonuclear reactions proceed further and the star becomes even hotter un ...
... they enter the dwarf stage. Our Sun for example, is 4.5 × 109 years old and is expected to live another 7.5 × 109 years before collapsing to a white dwarf. Stars above eight solar masses evolve more rapidly: Additionally the thermonuclear reactions proceed further and the star becomes even hotter un ...
Science performance of Gaia, ESA`s space
... The Gaia spacecraft (built under responsibility of EADS Astrium SAS, France; Fig. 4) is comprised of a payload module (built under responsibility of EADS Astrium SAS, France), a mechanical service module (built under responsibility of EADS Astrium GmbH, Germany), and an electrical service module (bu ...
... The Gaia spacecraft (built under responsibility of EADS Astrium SAS, France; Fig. 4) is comprised of a payload module (built under responsibility of EADS Astrium SAS, France), a mechanical service module (built under responsibility of EADS Astrium GmbH, Germany), and an electrical service module (bu ...
U-direction
... metric can be assigned as the “SHARPNESS” value which is the ratio of the light intensity at the central pixel to the sum of intensities at the 8-neighhbouring pixels. It represents the sharpness of the light intensity profile. This metric will be used in the rule base, and is given by [4]: ...
... metric can be assigned as the “SHARPNESS” value which is the ratio of the light intensity at the central pixel to the sum of intensities at the 8-neighhbouring pixels. It represents the sharpness of the light intensity profile. This metric will be used in the rule base, and is given by [4]: ...
Direct Imaging and Spectroscopy of a Candidate Companion Below
... the 2011 Keck and VLT images were nearly diffraction limited. All data were obtained in classical imaging, not angular differential imaging (Marois et al. 2006), and in various dither/nod patterns to remove the sky background. The field of view was ≈ 10, 20, and 3 arc-seconds on a side for the NIRC2 ...
... the 2011 Keck and VLT images were nearly diffraction limited. All data were obtained in classical imaging, not angular differential imaging (Marois et al. 2006), and in various dither/nod patterns to remove the sky background. The field of view was ≈ 10, 20, and 3 arc-seconds on a side for the NIRC2 ...
Proficiency Step #5--
... dividing up the sky into “sectors” made things more manageable and easier to remember. The earliest references to the constellations were from the Middle-eastern Sky Myths of the 8th century BC, but the most complete early references can be found in the writings of the ancient Greek astronomer Erato ...
... dividing up the sky into “sectors” made things more manageable and easier to remember. The earliest references to the constellations were from the Middle-eastern Sky Myths of the 8th century BC, but the most complete early references can be found in the writings of the ancient Greek astronomer Erato ...
Chpt17-18
... Is the universe infinite or closed. Olbers’s Paradox says in must be finite because if it was infinite then every direction one looked in space would ultimately land on the surface of a star and the whole sky would be as bright as the Sun’s surface. ...
... Is the universe infinite or closed. Olbers’s Paradox says in must be finite because if it was infinite then every direction one looked in space would ultimately land on the surface of a star and the whole sky would be as bright as the Sun’s surface. ...
RobinCollins_CPiS_Ca..
... Why would an increase in α have this result? Answer: In atomic units, everyday chemistry and the size of everyday atoms are not affected by a moderate increase or any decrease in α. Hence, the combustion rate of wood remains the same. In these units, however, the rate of radiant output of a fire is ...
... Why would an increase in α have this result? Answer: In atomic units, everyday chemistry and the size of everyday atoms are not affected by a moderate increase or any decrease in α. Hence, the combustion rate of wood remains the same. In these units, however, the rate of radiant output of a fire is ...
Astronomical spectroscopy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.