Seyfert Galaxies - Otterbein University
... – Solar System: the orbital velocities of planets determined by mass of Sun – Galaxy: orbital velocities of stars are determined by total mass of the galaxy contained within that star’s orbit ...
... – Solar System: the orbital velocities of planets determined by mass of Sun – Galaxy: orbital velocities of stars are determined by total mass of the galaxy contained within that star’s orbit ...
Is There a Ring Around Milky Way?
... forming a ring structure around our Galaxy. In fact, such satellite-stellar systems may be considered to be the parts of the ring structure around our Galaxy. If the mass and the radius of our Galaxy are 10-15% less than what we have assumed above, we get one orbit within the orbit of LMC which, of ...
... forming a ring structure around our Galaxy. In fact, such satellite-stellar systems may be considered to be the parts of the ring structure around our Galaxy. If the mass and the radius of our Galaxy are 10-15% less than what we have assumed above, we get one orbit within the orbit of LMC which, of ...
Distances
... larger than the Earth’s orbit. One option is to use the Sun’s motion of 4 AU=yr with respect to the standard of rest defined by stars in our neighborhood; for example, over an interval of 50 yr this yields a baseline of 200 AU, so the resulting secular parallax is 100 times the trigonometric paral ...
... larger than the Earth’s orbit. One option is to use the Sun’s motion of 4 AU=yr with respect to the standard of rest defined by stars in our neighborhood; for example, over an interval of 50 yr this yields a baseline of 200 AU, so the resulting secular parallax is 100 times the trigonometric paral ...
masses of star clusters in the nuclei of bulgeless spiral galaxies
... of the stellar photospheric lines and the instrumental broadening. The galaxy spectra of unresolved populations are presumed to differ only by the additional Doppler broadening, reflecting the velocity dispersion of the stars. For massive galaxies this last broadening dominates the intrinsic line wi ...
... of the stellar photospheric lines and the instrumental broadening. The galaxy spectra of unresolved populations are presumed to differ only by the additional Doppler broadening, reflecting the velocity dispersion of the stars. For massive galaxies this last broadening dominates the intrinsic line wi ...
Stout_Research_paper
... Expecting to see first light in 2016, the Large Synoptic Survey Telescope (LSST) is an extremely large ground based telescope that anticipates funding and will be built in Chile. Described as “Wide-Fast-Deep”, the LSST will have an unprecedented wide field of view (ten square degrees for surveys), s ...
... Expecting to see first light in 2016, the Large Synoptic Survey Telescope (LSST) is an extremely large ground based telescope that anticipates funding and will be built in Chile. Described as “Wide-Fast-Deep”, the LSST will have an unprecedented wide field of view (ten square degrees for surveys), s ...
ppt - CIERA - Northwestern
... Densest stellar cluster--an extreme of star formation. SSCs cluster to make “starburst clumps” where SSC-SSC interactions are possible and which drive galactic winds. SSCs contain a full range of intermediate-high mass stars. Central stellar densities can exceed 105 stars/pc3. Mass segregation may h ...
... Densest stellar cluster--an extreme of star formation. SSCs cluster to make “starburst clumps” where SSC-SSC interactions are possible and which drive galactic winds. SSCs contain a full range of intermediate-high mass stars. Central stellar densities can exceed 105 stars/pc3. Mass segregation may h ...
Cosmology: Black Holes, Dark Matter and Dark Energy
... On their way to Earth, the X-rays from the quasar pass through a galaxy located 4 billion light years away. Atoms of various elements in this galaxy absorb some of the X-rays, and produce a dimming of the quasar's X-rays, or an X-ray shadow. In a similar way, when our body is X-rayed, our bones prod ...
... On their way to Earth, the X-rays from the quasar pass through a galaxy located 4 billion light years away. Atoms of various elements in this galaxy absorb some of the X-rays, and produce a dimming of the quasar's X-rays, or an X-ray shadow. In a similar way, when our body is X-rayed, our bones prod ...
Microlensing - Caltech Astronomy
... However, the lensing can still be detected because these multiple images appear as a single object of increased apparent brightness. Although this is not detectable in a one-off observation (since we do not know the ‘normal’ brightness of the source), with the passage of time the lens moves across t ...
... However, the lensing can still be detected because these multiple images appear as a single object of increased apparent brightness. Although this is not detectable in a one-off observation (since we do not know the ‘normal’ brightness of the source), with the passage of time the lens moves across t ...
Weak gravitational lensing
While the presence of any mass bends the path of light passing near it, this effect rarely produces the giant arcs and multiple images associated with strong gravitational lensing. Most lines of sight in the universe are thoroughly in the weak lensing regime, in which the deflection is impossible to detect in a single background source. However, even in these cases, the presence of the foreground mass can be detected, by way of a systematic alignment of background sources around the lensing mass. Weak gravitational lensing is thus an intrinsically statistical measurement, but it provides a way to measure the masses of astronomical objects without requiring assumptions about their composition or dynamical state.