Results 71 to 80 of about 329,361 (183)
A Slowly Pulsating Run‐Away B Star at High Galactic Latitude Ejected From a Spiral Arm
Astronomische Nachrichten, EarlyView.ABSTRACT We report the discovery of the young B6 V run‐away star LAMOST J083323.18 + 430825.4, 2.5 kpc above the Galactic plane. Its atmospheric parameters and chemical composition are determined from LAMOST spectra, indicating normal composition. Effective temperature (Teff$$ {T}_{\mathrm{eff}} $$ = 14,500$$ \mathrm{14,500} $$ K) and gravity (logg ...
Ulrich Heber +3 more
wiley +1 more source
Dark Energy From the Gravitational Wave Background With Scalar Field Dark Matter
Astronomische Nachrichten, EarlyView.ABSTRACT Recent observational results, such as those from pulsar timing arrays (PTA), suggest a low‐frequency Gravitational Wave Background (GWB) permeates our universe. This opens the possibility that gravitational waves could span a broader spectrum, potentially impacting cosmological scales.
Edwin L. Pérez‐Ochoa, Tonatiuh Matos
wiley +1 more source
Rotation curve bifurcations as indicators of close recent galaxy encounters [PDF]
, 2008 Context. Rotation curves of interacting galaxies often show that velocities are either rising or falling in the direction of the companion galaxy. Aims.
S. Pedrosa +3 more
semanticscholar +1 more source
Milky Way rotation curve from proper motions of red clump giants [PDF]
, 2014 We derive the stellar rotation curve of the Galaxy in the range of Galactocentric radii of R=4-16 kpc at different vertical heights from the Galactic plane of z between -2 and +2 kpc.
M. López-Corredoira
semanticscholar +1 more source
Magnetic fields: impact on the rotation curve of the Galaxy [PDF]
Monthly Notices of the Royal Astronomical Society, 2013 11 pages, 8 figures, accepted for publication in ...
F. J. Sánchez-Salcedo +1 more
openaire +2 more sources
Declining rotation curves at $z=2$ in $Λ$CDM galaxy formation simulations [PDF]
, 2017 Selecting disk galaxies from the cosmological, hydrodynamical simulation Magneticum Pathfinder we show that almost half of our poster child disk galaxies at $z=2$ show significantly declining rotation curves and low dark matter fractions, very similar to recently reported observations.
arxiv +1 more source
Confrontation of MOND with the rotation curves of early-type disc galaxies [PDF]
Mon.Not.Roy.Astron.Soc.379:702-710,2007, 2007 We extend the MOND analysis to a sample of 17 high surface brightness, early-type disc galaxies with rotation curves derived from a combination of 21cm HI line observations and optical spectroscopic data. A number of these galaxies have asymptotic rotation velocities between 250 and 350 km/s making them among the most massive systems (in terms of ...
arxiv +1 more source
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract The light climate at high latitudes, in particular the extended twilight of winter and the reduced diel variation in light level in midsummer and midwinter, potentially constrains visual function and the synchronisation of temporal organisation in polar species. In this
Nicholas J. C. Tyler +3 more
wiley +1 more source
The Milky Way rotation curve revisited
, 2017 The Herschel survey of the Galactic Plane (Hi-GAL) is a continuum Galactic plane survey in five wavebands at 70, 160, 250, 350 and 500 μ m. From such images, about 150 000 sources have been extracted for which the distance determination is a challenge ...
D. Russeil +5 more
semanticscholar +1 more source
Modeling the Rising Tails of Galaxy Rotation Curves [PDF]
Galaxies, 2018 It is well known, but under-appreciated in astrophysical applications, that it is possible for gravity to take on a life of its own in the form of Weyl-curvature-only metrics (note that we are referring to the Weyl-only solutions of ordinary General Relativity; we are not considering Weyl conformal gravity or any other modified gravity theories), as ...
openaire +4 more sources