The Kuiper Belt and Other Debris Disks - UCLA
... Jupiter (310 M⊕ ) and Saturn (95 M⊕ ) are so-called because, mass-wise, they are dominated by hydrogen and helium. Throughout the bulk of each planet these gases are compressed, however, into a degenerate (metallic) liquid that supports convection and sustains a magnetic field through dynamo action. ...
... Jupiter (310 M⊕ ) and Saturn (95 M⊕ ) are so-called because, mass-wise, they are dominated by hydrogen and helium. Throughout the bulk of each planet these gases are compressed, however, into a degenerate (metallic) liquid that supports convection and sustains a magnetic field through dynamo action. ...
IXO as an observatory in the large telescopes era
... luminosity and redshift range. If there is a large population of such objects at cosmological redshifts, they could make a major contribution to the total accretion power (Fabian & Iwasawa 1999). This can change our view of the accretion history of the universe established from Compton-thin AGNs, wh ...
... luminosity and redshift range. If there is a large population of such objects at cosmological redshifts, they could make a major contribution to the total accretion power (Fabian & Iwasawa 1999). This can change our view of the accretion history of the universe established from Compton-thin AGNs, wh ...
Magnetic Fields
... in which a negative electron orbits a positive nucleus. The electron's motion is that of a current loop. Consequently, an orbiting electron acts as a tiny magnetic dipole, with a north pole and a south pole. However, the atoms of most elements contain many electrons. Unlike the solar system, where a ...
... in which a negative electron orbits a positive nucleus. The electron's motion is that of a current loop. Consequently, an orbiting electron acts as a tiny magnetic dipole, with a north pole and a south pole. However, the atoms of most elements contain many electrons. Unlike the solar system, where a ...
low surface brightness galaxies
... Using 21-cm observations of spiral galaxies, in 1977 Tully & Fisher found that the maximum rotation velocity of spirals is closely related to their luminosity, following the relation ...
... Using 21-cm observations of spiral galaxies, in 1977 Tully & Fisher found that the maximum rotation velocity of spirals is closely related to their luminosity, following the relation ...
The destruction and survival of polycyclic aromatic hydrocarbons in
... PAH destruction by photons, assuming that the star has beside its photospheric emission also a far ultraviolet (FUV), an extreme ultraviolet (EUV) and an X-ray component with a fractional luminosity of 1%, 0.1% and 0.025%, respectively. We consider as a PAH destruction process unimolecular dissociat ...
... PAH destruction by photons, assuming that the star has beside its photospheric emission also a far ultraviolet (FUV), an extreme ultraviolet (EUV) and an X-ray component with a fractional luminosity of 1%, 0.1% and 0.025%, respectively. We consider as a PAH destruction process unimolecular dissociat ...
The Magnetic Dipole
... The above equation is in fact valid for any magnetic dipole m located at the origin, regardless of its direction! In other words, we can also use the above expression if m is pointed in some direction other than âz ,e.g.: ...
... The above equation is in fact valid for any magnetic dipole m located at the origin, regardless of its direction! In other words, we can also use the above expression if m is pointed in some direction other than âz ,e.g.: ...
Jets in Active Galactic Nuclei Alan P. Marscher
... the author and collaborators The plot in the right panel of Fig. 5 emphasizes the spectral bands containing most of the apparent luminosity. Translation to actual luminosity, however, requires that we remove the effects of relativistic beaming by dividing by δ 2+α if the flux is steady and by δ 3+α ...
... the author and collaborators The plot in the right panel of Fig. 5 emphasizes the spectral bands containing most of the apparent luminosity. Translation to actual luminosity, however, requires that we remove the effects of relativistic beaming by dividing by δ 2+α if the flux is steady and by δ 3+α ...