Results 101 to 110 of about 11,151 (256)

Gamma-Rays from Dark Matter Mini-Spikes in M31

, 2007
The existence of a population of wandering Intermediate Mass Black Holes (IMBHs) is a generic prediction of scenarios that seek to explain the formation of Supermassive Black Holes in terms of growth from massive seeds.
Gianfranco Bertone, J. J. Geehan, Marco Taoso, Mattia Fornasa   +3 more
core   +2 more sources

The M31–M33 Interaction: Impact on M31’s Center-of-mass Motion and Satellite Orbits

The Astrophysical Journal
Inspired by recent studies of the interaction between the Milky Way and the Large Magellanic Cloud and its implications for the Milky Way’s global dynamical history, we investigate how the massive satellite galaxy M33 influences the position and velocity
Ekta Patel, Nicolás Garavito-Camargo, Ivanna Escala   +2 more
doaj   +1 more source

Perspectives. [PDF]

AJNR Am J Neuroradiol, 2023
Ross JS.
europepmc   +1 more source

Stellar Metallicities and Gradients in the Faint M31 Satellites Andromeda XVI and Andromeda XXVIII

The Astrophysical Journal
We present ∼300 stellar metallicity measurements in two faint M31 dwarf galaxies, Andromeda XVI ( M _V = −7.5) and Andromeda XXVIII ( M _V = –8.8), derived using metallicity-sensitive calcium H and K narrowband Hubble Space Telescope imaging.
Sal Wanying Fu, Daniel R. Weisz, Else Starkenburg, Nicolas Martin, Michelle L. M. Collins, Alessandro Savino, Michael Boylan-Kolchin, Patrick Côté, Andrew E. Dolphin, Nicolas Longeard, Mario L. Mateo, Francisco J. Mercado, Nathan R. Sandford, Evan D. Skillman   +13 more
doaj   +1 more source

Fermi bubbles around the M31 galaxy

EPJ Web of Conferences, 2016
We have searched for an extended high-energy gamma-ray emission around the nearby giant spiral Andromeda galaxy M31 using almost 7 years of Fermi LAT data at energies above 300 MeV.
Pshirkov Maxim, Vasiliev Valeriy, Postnov Konstantin   +2 more
doaj   +1 more source

A New Giant Stellar Structure in the Outer Halo of M31

, 2004
The Sloan Digital Sky Survey has revealed an overdensity of luminous red giant stars ~ 3 degrees (40 projected kpc) to the northeast of M31, which we have called Andromeda NE.
Bell, Eric F., Brewington, Howard, Brinkmann, J., Grebel, Eva K., Harvanek, Michael, Holtzman, Jon A., Ivezic, Zeljko, Kleinman, S. J., Kniazev, Alexei Y., Krzesinski, Jurek, Lamb, Don Q., Long, Dan, Martinez-Delgado, David, Newman, Peter R., Nitta, Atsuko, Rix, Hans-Walter, Rockosi, Constance M., Snedden, Stephanie A., Walterbos, Rene A. M., Zucker, Daniel B.   +19 more
core   +2 more sources

Andromeda galaxy vs Milky Way galaxy

Communications of the Byurakan Astrophysical Observatory
Some physical features of the Andromeda galaxy are compared with their counterparts in the Milky Way to demonstrate that the Andromeda galaxy has traversed a longer evolutionary path. One of the evolutionary dependents in galaxies is the metallicity factor. The metallicity radial gradient in galaxies can also be used for this purpose.
openaire   +1 more source

Far-ultraviolet to Far-infrared Spectral Energy Distribution Modeling of the Star Formation History across M31

The Astronomical Journal
Our neighboring galaxy M31 has been recently surveyed at the far- and near-ultraviolet (FUV and NUV) with the UVIT telescope on AstroSat, which provides unprecedented sensitivity to young stellar populations.
Denis A. Leahy, Jakob Hansen, Andrew M. Hopkins   +2 more
doaj   +1 more source

Extinction Distributions in Nearby Star-resolved Galaxies. I. M31

The Astronomical Journal
An extinction distribution of the Andromeda galaxy (M31) is constructed with member stars as tracers by fitting multiband photometric data from UKIRT/WFCAM, Panoramic Survey Telescope and Rapid Response System 1, and Gaia DR3.
Yuxi Wang, Jian Gao, Yi Ren, Bingqiu Chen   +3 more
doaj   +1 more source

AstroSat UVIT Survey of M31: New Compact Source Catalog

The Astrophysical Journal Supplement Series
An ultraviolet survey of M31 was carried out during 2017–2023 with the UltraViolet Imaging Telescope (UVIT) instrument on board the AstroSat Observatory. Here we present far- and near-ultraviolet (FUV and NUV) observations from the M31 UVIT survey, which
Denis Leahy, Sujith Ranasinghe, Saptadwipa Mitra, Kripansh Rawal   +3 more
doaj   +1 more source