Results 61 to 70 of about 370,839 (289)

An extremely metal-deficient globular cluster in the Andromeda Galaxy [PDF]

Science, 2020
A relic star cluster under the floor Globular clusters (GCs) are gravitationally bound assemblies of thousands to millions of stars that orbit in the outskirts of large galaxies. GCs consist of old stars with low metallicity containing low proportions of
S. Larsen, A. Romanowsky, J. Brodie, A. Wasserman   +3 more
semanticscholar   +1 more source

Critical summer foraging tradeoffs in a subarctic ungulate

Ecology and Evolution, Volume 11, Issue 24, Page 17835-17872, December 2021., 2021
Summer diets are crucial for subarctic herbivores and are affected by weather, insect harassment and a variety of environmental changes linked to climate. We used GPS video‐camera collars to observe behavioral patterns and summer diets of migratory caribou (Rangifer tarandus granti) across Alaska, USA and Yukon, Canada.
Libby Ehlers, Gabrielle Coulombe, Jim Herriges, Torsten Bentzen, Michael Suitor, Kyle Joly, Mark Hebblewhite   +6 more
wiley   +1 more source

A Nitrogen-rich Supernova Remnant in M31: Interaction with the Circumstellar Medium at Late Times

The Astrophysical Journal, 2023
We present the discovery of a supernova remnant in M31 which is unlike any other remnant known in that galaxy. An optical ground-based spectrum of WB92-26 taken at the MMT and sampling most of this marginally resolved object reveals strong lines of [O ii
Nelson Caldwell, John C. Raymond
doaj   +1 more source

The Large-scale Structure of the Halo of the Andromeda Galaxy. II. Hierarchical Structure in the Pan-Andromeda Archaeological Survey [PDF]

Astrophysical Journal, 2018
The Pan-Andromeda Archaeological Survey is a survey of >400 square degrees centered on the Andromeda (M31) and Triangulum (M33) galaxies that has provided the most extensive panorama of an L⋆ galaxy group to large projected galactocentric radii. Here, we
A. McConnachie, R. Ibata, N. Martin, A. Ferguson, M. Collins, S. Gwyn, M. Irwin, G. Lewis, A. Mackey, T. Davidge, V. Arias, A. Conn, P. Côté, D. Crnojević, A. Huxor, J. Peñarrubia, C. Spengler, N. Tanvir, D. Valls-Gabaud, A. Babul, P. Barmby, N. Bate, E. Bernard, S. Chapman, A. Dotter, W. Harris, B. McMonigal, J. Navarro, T. Puzia, R. Rich, G. Thomas, L. Widrow   +31 more
semanticscholar   +1 more source

A Quarter Century of Wind Spacecraft Discoveries

Reviews of Geophysics, Volume 59, Issue 2, June 2021., 2021
Abstract The Wind spacecraft, launched on November 1, 1994, is a critical element in NASA’s Heliophysics System Observatory (HSO)—a fleet of spacecraft created to understand the dynamics of the Sun‐Earth system. The combination of its longevity (>25 years in service), its diverse complement of instrumentation, and high resolution and accurate ...
Lynn B. Wilson III, Alexandra L. Brosius, Natchimuthuk Gopalswamy, Teresa Nieves‐Chinchilla, Adam Szabo, Kevin Hurley, Tai Phan, Justin C. Kasper, Noé Lugaz, Ian G. Richardson, Christopher H. K. Chen, Daniel Verscharen, Robert T. Wicks, Jason M. TenBarge   +13 more
wiley   +1 more source

Is identity illusory?

European Journal of Philosophy, Volume 29, Issue 1, Page 55-73, March 2021., 2021
Abstract Certain of our traits are thought more central to who we are: they comprise our individual identity. What makes these traits privileged in this way? What accounts for their identity centrality? Although considerations of identity play a key role in many different areas of moral philosophy, I argue that we currently have no satisfactory account
Andreas L. Mogensen
wiley   +1 more source

New results from the UVIT survey of the Andromeda galaxy [PDF]

Journal of astrophysics and astronomy, 2020
The Andromeda galaxy (M31) has been observed with the UltraViolet Imaging Telescope (UVIT) instrument onboard the AstroSat Observatory. The M31 sky area was covered with 19 fields, in multiple UV filters per field, over the period of 2017 to 2019.
D. Leahy, J. Postma, M. Buick, C. Morgan, L. Bianchi, J. Hutchings   +5 more
semanticscholar   +1 more source

Mid-infrared spectroscopy of the Andromeda galaxy [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
We present Spitzer/Infrared Spectrograph (IRS) 5-21 micron spectroscopic maps towards 12 regions in the Andromeda galaxy (M31). These regions include the nucleus, bulge, an active region in the star-forming ring, and 9 other regions chosen to cover a range of mid-to-far-infrared colours. In line with previous results, PAH feature ratios (6.2 micron and
D. Hemachandra, Denise A. Smith, Giovanni G. Fazio, M. L. N. Ashby, Els Peeters, Els Peeters, Pauline Barmby, Steven P. Willner, Howard A. Smith, Karl D. Gordon   +9 more
openaire   +5 more sources

The masses of the Milky Way and Andromeda galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2010
We present a family of robust tracer mass estimators to compute the enclosed mass of galaxy haloes from samples of discrete positional and kinematical data of tracers, such as halo stars, globular clusters and dwarf satellites. The data may be projected positions, distances, line of sight velocities or proper motions.
Laura L. Watkins, N. Wyn Evans, J. An, J. An   +3 more
openaire   +4 more sources

The Andromeda Stream [PDF]

, 2004
The existence of a stream of tidally stripped stars from the Sagittarius Dwarf galaxy demonstrates that the Milky Way is still in the process of accreting mass.
Chapman, S. C., Ferguson, A. M. N., Ibata, R. A., Irwin, M. J., Lewis, G. F., McConnachie, A. W., Tanvir, N.   +6 more
core   +1 more source