We also consider more extended models of the halo. While isothermal halo models are convectively stable if the density decreases with distance from the Galaxy, a model of an extended adiabatic halo in hydrostatic equilibrium with the Galaxy's dark matter is on the boundary between stability and ...
The latter is achieved as the paratroopers can jump from the aircraft, which is flying some distance away from the drop zone.iii. The reflection of cockpit instruments seen in a canopy at night.iv. The colored ring seen on clouds in the direction away from the sun (i.e., with the ...
The halo of the Milky Way provides a laboratory to study the properties of the shocked hot gas that is predicted by models of galaxy formation. There is observational evidence of energy injection into the halo from past activity in the nucleus of the Milky Way1,2,3,4; however, the origin...
The Milky Way is surrounded by dozens of ultrafaint (<105 L☉) dwarf satellite galaxies1,2,3. They are the remnants of the earliest galaxies4, as confirmed by their ancient5 and chemically primitive6,7 stars. Simulations8,9,10
However, the predicted scatter in this relation is large, and more galaxies are needed to better quantify this possible tension with galaxy formation models. Dragonfly is well suited for this project: as integrated-light surface brightness is independent of distance, large numbers of galaxies can ...
Both of these criticisms might have been developed from criterion iv) in the paper by NN15. However, whether or not an aurora is overshined by the Moon depends on the lunar phase, the brightness of the aurora, and the angular distance between the Moon and the sky positions occupied by ...
mostly located in the galactic center and, therefore, increasing the baryonic matter can affect the size of black hole shadow compared to the totally dominated dark matter galaxy where we observe an increase of the angular diameter of the Sgr A∗ black hole of the magnitude μ10−5μarc...
The stellar stream is clearly confirmed in additional deep images taken with the 0.5 m telescope of the BlackBird Remote Observatory and the 0.8 m telescope of the McDonald Observatory. This low surface brightness (µR ≈ 26 mag arcsec−2), arc-like structure around the disk of the ...
(e.g. Johnston et al. 1996). Among the best tracers to study theouter halo are RR Lyrae stars because• They are nearly standard candles (σM∼ 0.15 mag) and thus it is straight-forward to determine their distance• They are su ciently bright to be detected at large distances (...
arcmin × 1 arcmin, with North up and East to the left. Cluster 3 is a partial image as it lies on the edge of an INT-WFS field. clusters appear, in projection, to cover a range of environ- ments, from the far halo (C2), to near the disk (C3; though ...