New Dark Matter Physics: Clues from Halo Structure
... phase density needed to create the cores of rotating dwarf galaxies is much lower than that apparently present in dwarf spheroidal galaxies [1,45,21,34,24,53,37]— so at least one of these populations is not probing primordial phase density. Translating into masses of neutrino-like relics, the sphero ...
... phase density needed to create the cores of rotating dwarf galaxies is much lower than that apparently present in dwarf spheroidal galaxies [1,45,21,34,24,53,37]— so at least one of these populations is not probing primordial phase density. Translating into masses of neutrino-like relics, the sphero ...
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... relativistic jets. It is situated at a distance of approximately 5 kpc = 1.5 10^22 cm nearly in the galactic plane. The optical companion V1343 Aquilae was first identified in the survey of stars exhibiting H_alpha (656 nm) emission by Stephenson and Sanduleak in 1977. This binary has been observed ...
... relativistic jets. It is situated at a distance of approximately 5 kpc = 1.5 10^22 cm nearly in the galactic plane. The optical companion V1343 Aquilae was first identified in the survey of stars exhibiting H_alpha (656 nm) emission by Stephenson and Sanduleak in 1977. This binary has been observed ...
Light, Matter, and the basics - Purdue University Cytometry
... Photometry: Light - what is it - wavelengths we can see 400-750 nm, most sensitive around 550 nm. Below 400 nm essentially measuring radiant energy. Joules (energy) radiant flux (energy per unit time) is measured in watts (1 watt=1 joule/second). Steradian (sphere radius r has surface area of 4 r2; ...
... Photometry: Light - what is it - wavelengths we can see 400-750 nm, most sensitive around 550 nm. Below 400 nm essentially measuring radiant energy. Joules (energy) radiant flux (energy per unit time) is measured in watts (1 watt=1 joule/second). Steradian (sphere radius r has surface area of 4 r2; ...
Cool Subdwarf Investigations (CSI) I: New Thoughts for the Spectral
... three categories: regular dwarfs, subdwarfs, and extreme subdwarfs. Numerical subclasses were then assigned using two independent linear fits for subdwarfs and extreme subdwarfs. ...
... three categories: regular dwarfs, subdwarfs, and extreme subdwarfs. Numerical subclasses were then assigned using two independent linear fits for subdwarfs and extreme subdwarfs. ...
Survey of Astrophysics A110 Cosmology
... equivalent), is not a real problem. After all, when the issue is the origin of the Universe, at some point matter must be created. [Only one atom would have to be created in a cubic cm of space every million billion years (1015 years)]. • In its purest form, the Steady State Theory is not consistent ...
... equivalent), is not a real problem. After all, when the issue is the origin of the Universe, at some point matter must be created. [Only one atom would have to be created in a cubic cm of space every million billion years (1015 years)]. • In its purest form, the Steady State Theory is not consistent ...
The Origin of Comets and the Oort Cloud
... centre of the Universe; the Moon, Sun and planets revolve around the Earth, as too do the fixed stars. The dogma persisted nearly 2000 years. 2. Renaissance: Rediscovery that comet tails always point away from the Sun (Apian et al.). Showed that comets not totally unpredictable! 3. Distance: Comet o ...
... centre of the Universe; the Moon, Sun and planets revolve around the Earth, as too do the fixed stars. The dogma persisted nearly 2000 years. 2. Renaissance: Rediscovery that comet tails always point away from the Sun (Apian et al.). Showed that comets not totally unpredictable! 3. Distance: Comet o ...
Star clusters in M 33 - IV. A new survey from deep HST images
... with optical magnitudes was used to further constrain reddening and age for young M 33 clusters (Bianchi et al. 1999; Chandar et al. 1999c; hereafter Paper III). King profiles were fit to the brightest cluster radial profiles, and core radii are estimated in the range from <0.2 parsecs to ∼2 parsecs ...
... with optical magnitudes was used to further constrain reddening and age for young M 33 clusters (Bianchi et al. 1999; Chandar et al. 1999c; hereafter Paper III). King profiles were fit to the brightest cluster radial profiles, and core radii are estimated in the range from <0.2 parsecs to ∼2 parsecs ...
Optical Wave Guide Polarization Measurement System Students
... Tmax and Tmin can be used to calculate the polarization dependent loss (PDL) of the device. The HP 8169A Polarization Controller is a device that changes the polarization of an input PDL = 10*Log (Tmax/Tmin) signal, and outputs a new polarized signal. The 3 parameters you can change are the PDL show ...
... Tmax and Tmin can be used to calculate the polarization dependent loss (PDL) of the device. The HP 8169A Polarization Controller is a device that changes the polarization of an input PDL = 10*Log (Tmax/Tmin) signal, and outputs a new polarized signal. The 3 parameters you can change are the PDL show ...
Hyperfine structure in photoassociative spectra of 6Li2
... contributes an amount to the spectral width that is comparable to the natural linewidth of the transition. The high resolution inherent to this technique has enabled observations of molecular hyperfine structure in the singly excited electronic states of Li2 @2,3#, Na 2 @4–6#, and Rb 2 @7,8#. Numeri ...
... contributes an amount to the spectral width that is comparable to the natural linewidth of the transition. The high resolution inherent to this technique has enabled observations of molecular hyperfine structure in the singly excited electronic states of Li2 @2,3#, Na 2 @4–6#, and Rb 2 @7,8#. Numeri ...
Lecture 2. Thermal evolution and surface emission of
... Different tests and constraints are sensitive to different parameters, so, typically it is better to use several different tests ...
... Different tests and constraints are sensitive to different parameters, so, typically it is better to use several different tests ...
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... Many of the main ideas in cosmology are accessible even to very young children and should be presented to them. Cosmology can be challenging to teach -- provide connections to make it relevant to the students. Journey Through the Universe -- Cosmology ...
... Many of the main ideas in cosmology are accessible even to very young children and should be presented to them. Cosmology can be challenging to teach -- provide connections to make it relevant to the students. Journey Through the Universe -- Cosmology ...
Atmospheric Optics 1
... (like atmospheric molecules or atoms), the process can be described by Rayleigh-Scattering. The oscillating electric field of the (unpolarized) incoming EM wave moves the electrons and the nucleus of the molecule with respect to each other (depending on the polarizability,α).The molecule becomes a s ...
... (like atmospheric molecules or atoms), the process can be described by Rayleigh-Scattering. The oscillating electric field of the (unpolarized) incoming EM wave moves the electrons and the nucleus of the molecule with respect to each other (depending on the polarizability,α).The molecule becomes a s ...
moiré technique
... This is analogous to time-average holography and gives for the transmittance ...
... This is analogous to time-average holography and gives for the transmittance ...
A short introduction to light and electron microscopy
... Light interacts with matter in a variety of ways. Light incident on an object might be absorbed, transmitted, reflected, or diffracted. Such objects are opaque, transparent, reflective, or scattering. Light may be absorbed and then re-emitted as visible light or as heat. Objects or molecules that ab ...
... Light interacts with matter in a variety of ways. Light incident on an object might be absorbed, transmitted, reflected, or diffracted. Such objects are opaque, transparent, reflective, or scattering. Light may be absorbed and then re-emitted as visible light or as heat. Objects or molecules that ab ...
Stargazing For Beginners: A Binocular Tour of the Southern Night Sky
... low power views of the sky without the dreaded image shake of standard binoculars. And no tripod is required. Many rave about these technical wonders for astronomy or terrestrial use. In IS binoculars, piezoelectric motion sensors detect pitch and yaw movements. The motion signal feeds into a microp ...
... low power views of the sky without the dreaded image shake of standard binoculars. And no tripod is required. Many rave about these technical wonders for astronomy or terrestrial use. In IS binoculars, piezoelectric motion sensors detect pitch and yaw movements. The motion signal feeds into a microp ...
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.