Lyman-alpha imaging of starburst galaxies in the local universe and beyond Matthew Hayes
... review can be found in Kennicutt (1998a). For standard initial mass function (IMF; the mass distribution of stars at zero age)1 , the relative abundance of massive stars is small. Since these stars have very short lifetimes (less than the proto-stellar collapse timescale) ongoing star formation is r ...
... review can be found in Kennicutt (1998a). For standard initial mass function (IMF; the mass distribution of stars at zero age)1 , the relative abundance of massive stars is small. Since these stars have very short lifetimes (less than the proto-stellar collapse timescale) ongoing star formation is r ...
Sowing the Seeds of Asymmetry Jet-like Outflows in pPNe and AGB
... 45 nPPNe were imaged. 30% of these are resolved - aspherical structure is seen in 60% of the resolved objects In our PPN survey, fully 50% of our sample of 52 showed resolved morphologies, all of which were aspherical. The aspherical structure in the nPPN images (generally onesided when collimated s ...
... 45 nPPNe were imaged. 30% of these are resolved - aspherical structure is seen in 60% of the resolved objects In our PPN survey, fully 50% of our sample of 52 showed resolved morphologies, all of which were aspherical. The aspherical structure in the nPPN images (generally onesided when collimated s ...
Applications of Photospheric Spot Temperature Models ... Stellar Angular Momentum Evolution
... given the continued gravitational contraction. Observational studies comparing PMS stars and stars that have just reached the main sequence, so-called zero-age main-sequence (ZAMS) stars, show that the rotation rate distribution of T Tauri stars is not consistent with the rotation rate distribution ...
... given the continued gravitational contraction. Observational studies comparing PMS stars and stars that have just reached the main sequence, so-called zero-age main-sequence (ZAMS) stars, show that the rotation rate distribution of T Tauri stars is not consistent with the rotation rate distribution ...
Efficiency of gas cooling and accretion at the disc-corona
... the H I halo kinematics could be explained by assuming that the fountain clouds lose angular momentum by accreting material with lower angular momentum from ambient medium. In order to investigate the physical phenomenon that drives the interaction between the hot corona and the cold fountain clouds ...
... the H I halo kinematics could be explained by assuming that the fountain clouds lose angular momentum by accreting material with lower angular momentum from ambient medium. In order to investigate the physical phenomenon that drives the interaction between the hot corona and the cold fountain clouds ...
solon irving bailey - National Academy of Sciences
... elevated station might be maintained. Thus the problem was solved by the construction of a mule-path to the summit. A vivid description of this project is given in Harvard Annals 39, the first volume of the Peruvian Meteorology. After Professor Bailey and his party had passed eight consecutive days ...
... elevated station might be maintained. Thus the problem was solved by the construction of a mule-path to the summit. A vivid description of this project is given in Harvard Annals 39, the first volume of the Peruvian Meteorology. After Professor Bailey and his party had passed eight consecutive days ...
Classical Be Stars: Rapidly Rotating B Stars with Viscous Keplerian
... population with likely a different mechanism responsible for the filling of the circumstellar environment (which may nevertheless be disk-shaped). Star with Emission Line Magnetospheres: Magnetic B stars do not typically show line emission, but depending on the field strength, wind, mass-loss and ro ...
... population with likely a different mechanism responsible for the filling of the circumstellar environment (which may nevertheless be disk-shaped). Star with Emission Line Magnetospheres: Magnetic B stars do not typically show line emission, but depending on the field strength, wind, mass-loss and ro ...
Cosmological Constraints from the Virial Mass
... ster.), which is necessary given the low redshift limit of the survey. I acquire optical redshifts for the target galaxies in R2FGS from the literature and from new data collected with the FAST spectrograph on Mt. Hopkins. After removing foreground and background galaxies (interlopers) using a dynam ...
... ster.), which is necessary given the low redshift limit of the survey. I acquire optical redshifts for the target galaxies in R2FGS from the literature and from new data collected with the FAST spectrograph on Mt. Hopkins. After removing foreground and background galaxies (interlopers) using a dynam ...
Absorption of low-loss optical materials measured at 1064 nm by a
... batches with absorption ranging from 0.4 to 4 ppm兾cm. We used Suprasil 311 and Suprasil 311SV samples. Suprasil 311SV has a lower OH content than standard Suprasil 311 silica and is optimized for use at 1064 nm. For each sample we made four to eight measurements at different positions and different ...
... batches with absorption ranging from 0.4 to 4 ppm兾cm. We used Suprasil 311 and Suprasil 311SV samples. Suprasil 311SV has a lower OH content than standard Suprasil 311 silica and is optimized for use at 1064 nm. For each sample we made four to eight measurements at different positions and different ...
The white dwarf population within 40 pc of the Sun
... this value there is a dramatic drop in the white dwarf number counts. Furthermore, for distances of ∼ 40 pc the observational magnitude cut will eliminate all white dwarfs with bolometric magnitudes larger than Mbol ≈ 16.0. However, this magnitude cut still enables us to resolve the sharp drop-off i ...
... this value there is a dramatic drop in the white dwarf number counts. Furthermore, for distances of ∼ 40 pc the observational magnitude cut will eliminate all white dwarfs with bolometric magnitudes larger than Mbol ≈ 16.0. However, this magnitude cut still enables us to resolve the sharp drop-off i ...
GAS KINEMATICS ON GMC SCALES IN M51 WITH PAWS: CLOUD
... by Pety et al. (2012). From the PAWS map of integrated CO(1-0) intensities (moment zero), we estimate the molecular gas surface density, applying a constant conversion factor XCO =2×1020 cm−2 (K km s−1 )−1 (as argued in Colombo et al. 2012) and including a factor of 1.36 to account for the presence ...
... by Pety et al. (2012). From the PAWS map of integrated CO(1-0) intensities (moment zero), we estimate the molecular gas surface density, applying a constant conversion factor XCO =2×1020 cm−2 (K km s−1 )−1 (as argued in Colombo et al. 2012) and including a factor of 1.36 to account for the presence ...
Spontaneous emission of a cesium atom near a nanofiber: Efficient
... 1.2 and 1.6, respectively 关see Figs. 2共b兲 and 2共c兲兴. As expected, the effect of the fiber on the decay rates is largest for the atom on the fiber surface. When the atom is far away 共g兲 共r兲 from the fiber, ␥ee reduces to zero while ␥ee and ⌫ee approach the free-space value ⌫0. The small oscillations ...
... 1.2 and 1.6, respectively 关see Figs. 2共b兲 and 2共c兲兴. As expected, the effect of the fiber on the decay rates is largest for the atom on the fiber surface. When the atom is far away 共g兲 共r兲 from the fiber, ␥ee reduces to zero while ␥ee and ⌫ee approach the free-space value ⌫0. The small oscillations ...
Efficient Homogeneous Catalysis in the Reduction of CO to CO
... CO is produced industrially from fossil fuels.3 Even with strong reducing agents, however, overcoming the OdCO bond enthalpy of 532 kJ/mol4 often presents kinetic difficulties.5,6 Certain metal complexes abstract oxygen readily from CO2,7 but the resulting metal-oxygen bonds are necessarily strong, ...
... CO is produced industrially from fossil fuels.3 Even with strong reducing agents, however, overcoming the OdCO bond enthalpy of 532 kJ/mol4 often presents kinetic difficulties.5,6 Certain metal complexes abstract oxygen readily from CO2,7 but the resulting metal-oxygen bonds are necessarily strong, ...
itpa - CERN Indico
... gridified a program package for the synthetic spectra modeling and is using it for: Chemical analysis of Galactic Red clump stars Chemical analysis of open clusters in the Galactic disk Investigation of chemical evolution of the Galactic thick disk Chemical analysis of stars in neighboring galaxies ...
... gridified a program package for the synthetic spectra modeling and is using it for: Chemical analysis of Galactic Red clump stars Chemical analysis of open clusters in the Galactic disk Investigation of chemical evolution of the Galactic thick disk Chemical analysis of stars in neighboring galaxies ...
A compact laser head with high-frequency stability for Rb atomic
... and from the measured values we obtain f 共兲 ⬇ 2 ⫻ 10−12−1/2. This value coincides with the measured shortterm stability, and is also competitive with the best results previously reported by Ye et al. for diode laser stabilization to Rb saturated absorption resonances, which however used a signif ...
... and from the measured values we obtain f 共兲 ⬇ 2 ⫻ 10−12−1/2. This value coincides with the measured shortterm stability, and is also competitive with the best results previously reported by Ye et al. for diode laser stabilization to Rb saturated absorption resonances, which however used a signif ...
V. experimental setup of all-optical tunable delay
... wavelength conversion and fiber dispersion; EDFA , erbium-doped fiber amplifier ; HNLF ; highly nonlinear fiber ; Mod , modulator ; BER, bit error rate; CW , continuous wave Figure (2) shows setup the block diagram of all-optical tunable delay. Firstly, the part of transmitter includes data bits, la ...
... wavelength conversion and fiber dispersion; EDFA , erbium-doped fiber amplifier ; HNLF ; highly nonlinear fiber ; Mod , modulator ; BER, bit error rate; CW , continuous wave Figure (2) shows setup the block diagram of all-optical tunable delay. Firstly, the part of transmitter includes data bits, la ...
Eclipse Box Activity Guide - Girl Scouts of Northern California
... Girl Scout Levels: Each activity shows the recommended Girl Scout levels. The Table of Contents has a chart that shows the same information. You know best what will be fun for your girls! Materials List: Each activity includes a materials list of what is provided in the Eclipse Box, and what you nee ...
... Girl Scout Levels: Each activity shows the recommended Girl Scout levels. The Table of Contents has a chart that shows the same information. You know best what will be fun for your girls! Materials List: Each activity includes a materials list of what is provided in the Eclipse Box, and what you nee ...
bode elert johann
... notes: “I tried the speculum last night on Saturn and found it to act very well with 3 and 4 inches of aperture.”23 17 August 1779 marks Herschel’s actual turn to stellar astronomy, inspired by the question of parallax and the existence of variable and double stars.24 He embarked on a “second review ...
... notes: “I tried the speculum last night on Saturn and found it to act very well with 3 and 4 inches of aperture.”23 17 August 1779 marks Herschel’s actual turn to stellar astronomy, inspired by the question of parallax and the existence of variable and double stars.24 He embarked on a “second review ...
Open access
... The work presented in this thesis has benefited greatly from interactions with many people. First of all, I want to express my deepest gratitude to my academic supervisor, Professor Jean Surdej. Thank you Jean for giving me the opportunity to work in your team, and all your wise advice all along this ...
... The work presented in this thesis has benefited greatly from interactions with many people. First of all, I want to express my deepest gratitude to my academic supervisor, Professor Jean Surdej. Thank you Jean for giving me the opportunity to work in your team, and all your wise advice all along this ...
SPDM: light microscopy with single
... is a focused beam method, in which the size of the excited region is greatly reduced by stimulated emission depletion [19]. Presently, this technique allows an optical lateral (x, y) resolution in the 15–20 nm range using visible light. In cases where the field of view can be made sufficiently small ...
... is a focused beam method, in which the size of the excited region is greatly reduced by stimulated emission depletion [19]. Presently, this technique allows an optical lateral (x, y) resolution in the 15–20 nm range using visible light. In cases where the field of view can be made sufficiently small ...
S-process in extremely metal-poor, low-mass stars
... to compute σ(AA,n) (τ), we first perform network integrations using a full s-process network with 613 isotopes, which includes neutrons to 211 Po. This network includes proton, neutron and alpha captures for all isotopes with A < 30, and neutron captures for those with A ≥ 30. In all cases, abundanc ...
... to compute σ(AA,n) (τ), we first perform network integrations using a full s-process network with 613 isotopes, which includes neutrons to 211 Po. This network includes proton, neutron and alpha captures for all isotopes with A < 30, and neutron captures for those with A ≥ 30. In all cases, abundanc ...
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.