Stellar halos may hold some of the best preserved fossils of the formation history of galaxies. They are a natural product of the merging processes that probably take place during the assembly of a galaxy, and hence may well be the most ubiquitous component of galaxies, independently of their ...
We report on a recent ~150-ks long Chandra observation of the ultraluminous infrared galaxy merger NGC 6240, which allows a detailed investigation of the diffuse galactic halo. Extended soft X-ray emission is detected at the 3-sigma confidence level over a diamond-shaped region with projected ...
Once this isunderstood we proceed to measure the shape and orientation of the halo'svelocity ellipsoid and we use this information to put constraints on thegravitational potential of the Galaxy. We use the recently released Gaia DR1catalogue cross-matched to the RAVE dataset for our analysis. ...
We study numerical simulations of satellite galaxy disruption in a potential resembling that of the Milky Way. Our goal is to assess whether a merger origin for the stellar halo would leave observable fossil structure in the phase-space distribution of n
We conclude that dark matter in spiral galaxies is a problem of geometry, and that Newton's law needs to be corrected to account for the geometry of the mass. Dark matter, the correction to Newton's law in a disk Among the topics are a forming polar ring galaxy in the deep field of...
(1994), `The attened dark halo of polar ring galaxy NGC4650A:A conspiracy of shapes', ApJ 436, 629.Sackett P., Rix H.-W., Jarvis B.J. and Freeman K.C., 1994, Ap. J. 436 , 629The flattened dark halo of polar ring galaxy NGC4650A:A conspiracy of shapes', ApJ - Sackett, ...
3.(Physical Geography) a circle of light around the sun or moon, caused by the refraction of light by particles of ice 4.(Astronomy)astronomya spherical cloud of stars surrounding the Galaxy and other spiral galaxies vb,-loes,-los,-loingor-loed ...
We show that the outflow velocity levels off at ~10³ km s-1 within the scale of the galaxy disc. Typically, the outflow can reach the virial radius around the time when the AGN shuts off. We show that the outflows are energy-driven, consistent with observations and recent theoretical...
There are wolves amongst the stars and many unanswered questions about the state of the galaxy, but one thing is clear: Spartans are going to be the tip of the spear as humanity regroups and rebuilds in order to face what’s out there. ...
Updated October 16And that’s a wrap! Thank you to everyone who joined us this past weekend for the 2023 Halo World Championship in Seattle – none of this is possible without you! The 2023 Halo World Championship event is almost here to bring Year 2