Life, gravity and the second law of thermodynamics
... of the universe. At the lowest level in the pyramid, the source of these almost unclumped baryons is baryon nonconservation [39]. The low initial gravitational entropy of the universe and baryon non-conservation are discussed further in Section 4. The sources of free energy in the universe are summa ...
... of the universe. At the lowest level in the pyramid, the source of these almost unclumped baryons is baryon nonconservation [39]. The low initial gravitational entropy of the universe and baryon non-conservation are discussed further in Section 4. The sources of free energy in the universe are summa ...
X-ray and Gamma-ray Studies of the Millisecond Pulsar and
... or pulsar wind nebula associated with the pulsar. We also report on a search for point source emission and γ -ray pulsations in Fermi Large Area Telescope data using a likelihood analysis and photon probability weighting. Although PSR J1723–2837 is consistent with being a γ -ray point source, due to ...
... or pulsar wind nebula associated with the pulsar. We also report on a search for point source emission and γ -ray pulsations in Fermi Large Area Telescope data using a likelihood analysis and photon probability weighting. Although PSR J1723–2837 is consistent with being a γ -ray point source, due to ...
A galaxy rapidly forming stars 700 million years after the Big Bang at
... 43 photometrically-selected galaxies with z . 6.5. We detect a near-infrared emission line from only a single galaxy, confirming that some process is making Lyman a difficult to detect. The detected emission line at a wavelength of 1.0343 micrometres is likely to be Lyman a emission, placing this ga ...
... 43 photometrically-selected galaxies with z . 6.5. We detect a near-infrared emission line from only a single galaxy, confirming that some process is making Lyman a difficult to detect. The detected emission line at a wavelength of 1.0343 micrometres is likely to be Lyman a emission, placing this ga ...
Gamma-ray burst investigation via polarimetry and spectroscopy
... us to investigate the host galaxies at these redshifts. GRBs are a factor 105−7 brighter than quasars during the first hour after explosion, and a favourable relativistic k-correction implies that they do not get fainter beyond z∼3. Yet, present and near-future ground- and space-based sensitivity li ...
... us to investigate the host galaxies at these redshifts. GRBs are a factor 105−7 brighter than quasars during the first hour after explosion, and a favourable relativistic k-correction implies that they do not get fainter beyond z∼3. Yet, present and near-future ground- and space-based sensitivity li ...
Coronal heating: a theoretical approach
... before it can be absorbed • Secondary generation: The Sun is suspected to emit lowfrequency (<10 mHz) Alfvén waves. This source of “free energy” may be converted into ion cyclotron waves gradually throughout the corona (MHD turbulent cascade, instabilities seeded by nonMaxwellian distributions) ...
... before it can be absorbed • Secondary generation: The Sun is suspected to emit lowfrequency (<10 mHz) Alfvén waves. This source of “free energy” may be converted into ion cyclotron waves gradually throughout the corona (MHD turbulent cascade, instabilities seeded by nonMaxwellian distributions) ...
SOLAR HARD X-RAY AND GAMMA-RAY OBSERVATIONS FROM
... Subject headings: acceleration of particles — Sun: flares — Sun: radio radiation — Sun: X-rays, gamma rays ,SMM(see, e.g., Chupp 1990a; Rieger 1990 for reviews), Hinotori (Yoshimori 1989), and more recently COMPTON (Murphyetal. 1993)and rO/Z/iTOtf (Yoshimorietal. 1992). A typical gamma-ray spectrum ...
... Subject headings: acceleration of particles — Sun: flares — Sun: radio radiation — Sun: X-rays, gamma rays ,SMM(see, e.g., Chupp 1990a; Rieger 1990 for reviews), Hinotori (Yoshimori 1989), and more recently COMPTON (Murphyetal. 1993)and rO/Z/iTOtf (Yoshimorietal. 1992). A typical gamma-ray spectrum ...
Studies of ion solitary waves using simulations including hydrogen
... matching these choices were as follows. The electron temperature was initially 0.5 keV, while both ion species had temperatures of 0.1 keV. The ion beams were chosen to have drift energies ranging from 2 to 32 keV. Some of these drift energies are higher than the range from 0.8 to 10 keV seen by FAS ...
... matching these choices were as follows. The electron temperature was initially 0.5 keV, while both ion species had temperatures of 0.1 keV. The ion beams were chosen to have drift energies ranging from 2 to 32 keV. Some of these drift energies are higher than the range from 0.8 to 10 keV seen by FAS ...
Applications of perturbation theory in black hole physics Paolo Pani
... from String Theory. They are almost unavoidably present in any relativistic theory of gravity and they probe the high energy/strong curvature regime. On the astrophysical side, black holes are the most compact celestial objects and they are believed to be very common in the universe. Stellar-mass bl ...
... from String Theory. They are almost unavoidably present in any relativistic theory of gravity and they probe the high energy/strong curvature regime. On the astrophysical side, black holes are the most compact celestial objects and they are believed to be very common in the universe. Stellar-mass bl ...
Applications of perturbation theory in black hole physics Paolo Pani
... from String Theory. They are almost unavoidably present in any relativistic theory of gravity and they probe the high energy/strong curvature regime. On the astrophysical side, black holes are the most compact celestial objects and they are believed to be very common in the universe. Stellar-mass bl ...
... from String Theory. They are almost unavoidably present in any relativistic theory of gravity and they probe the high energy/strong curvature regime. On the astrophysical side, black holes are the most compact celestial objects and they are believed to be very common in the universe. Stellar-mass bl ...
Harvesting ALFALFA: Discovering Galaxies in the Pisces
... ALFALFA Team. This work has been supported by NSF grants AST-1211005, AST1637339 and AST-1637271. The Cornell ALFLAFA Team also appreciates support from NSF/AST-1107390 and the Brinson Foundation. The Arecibo Observatory is operated by SRI International under a cooperative agreement with the Nationa ...
... ALFALFA Team. This work has been supported by NSF grants AST-1211005, AST1637339 and AST-1637271. The Cornell ALFLAFA Team also appreciates support from NSF/AST-1107390 and the Brinson Foundation. The Arecibo Observatory is operated by SRI International under a cooperative agreement with the Nationa ...
Stellar multiplicity and debris discs: an unbiased sample
... we consider a sample of 449 systems (spectral types A–M) observed with the Herschel Space Observatory as part of the DEBRIS (Disc Emission via a Bias-free Reconnaissance in the Infrared/Submillimetre) programme. We have examined the stellar multiplicity of this sample by gathering information from t ...
... we consider a sample of 449 systems (spectral types A–M) observed with the Herschel Space Observatory as part of the DEBRIS (Disc Emission via a Bias-free Reconnaissance in the Infrared/Submillimetre) programme. We have examined the stellar multiplicity of this sample by gathering information from t ...
Formation of millisecond pulsars with CO white dwarf companions–I
... star (essentially the mass of the white dwarf to be formed); M NS is the mass of the neutron star; and a is the final orbital separation after the CE phase. Strictly speaking, when considering the energy budget the ‘effective efficiency parameter’ should also include the excess energy of the ejected ...
... star (essentially the mass of the white dwarf to be formed); M NS is the mass of the neutron star; and a is the final orbital separation after the CE phase. Strictly speaking, when considering the energy budget the ‘effective efficiency parameter’ should also include the excess energy of the ejected ...
L25 A NEW CULPRIT IN THE SECOND
... We have explored a number of interpretations to account for the spur stars. Are the spur stars photometric blends?—The median FWHM of spur stars in the inner field is ∼10. 2, identical to that of SGB and BS stars of similar brightness in that field; their appearance is also similar. They are distrib ...
... We have explored a number of interpretations to account for the spur stars. Are the spur stars photometric blends?—The median FWHM of spur stars in the inner field is ∼10. 2, identical to that of SGB and BS stars of similar brightness in that field; their appearance is also similar. They are distrib ...
Reconciling observations and modelling of thermonuclear bursts
... pulsar, SAX J1808.4–3658), during the 2002 outburst; these events occur after any accreted H fuel at the ignition depth has been exhausted by steady burning prior to ignition; ...
... pulsar, SAX J1808.4–3658), during the 2002 outburst; these events occur after any accreted H fuel at the ignition depth has been exhausted by steady burning prior to ignition; ...
Engineering Energy Conversion Devices
... Electromagnetic radiation has many applications, and can be modeled as a wave of changing electric and magnetic fields or as particles called photons. ...
... Electromagnetic radiation has many applications, and can be modeled as a wave of changing electric and magnetic fields or as particles called photons. ...
The star-forming environment of an ultraluminous X-ray
... & Markoff 2002), or with super-Eddington emission from inhomogeneous discs (Begelman 2002). These different scenarios also predict different duty cycles and time-scales for the X-ray-bright phases, thus leading to different predictions for the total number of such systems (active or quiescent) in a ...
... & Markoff 2002), or with super-Eddington emission from inhomogeneous discs (Begelman 2002). These different scenarios also predict different duty cycles and time-scales for the X-ray-bright phases, thus leading to different predictions for the total number of such systems (active or quiescent) in a ...
Lesson 10 notes - Angular Measurement - science
... above the ground. This minimum speed will be the one for which the maximum frictional force exactly equals the gravitational pull on the mass (since any lower frictional force will not be strong enough to provide the balance). Higher speeds will also produce no slipping, but as the speed rises steer ...
... above the ground. This minimum speed will be the one for which the maximum frictional force exactly equals the gravitational pull on the mass (since any lower frictional force will not be strong enough to provide the balance). Higher speeds will also produce no slipping, but as the speed rises steer ...