Results 11 to 20 of about 370,839 (289)
DESI Observations of the Andromeda Galaxy: Revealing the Immigration History of Our Nearest Neighbor [PDF]
The Astrophysical Journal, 2023 We present Dark Energy Spectroscopic Instrument (DESI) observations of the inner halo of M31, which reveal the kinematics of a recent merger—a galactic immigration event—in exquisite detail.
Arjun Dey +47 more
doaj +2 more sources
The Andromeda Dwarf Spheroidal Galaxies [PDF]
Symposium - International Astronomical Union, 1999 Our current knowledge of M31's dwarf spheroidal companions is reviewed. Two topics of recent interest constitute the bulk of this review. First, color-magnitude diagrams reaching below the horizontal branch have been constructed for two M31 dwarf spheroidals, based on images from HST/WFPC2. The horizontal branches are predominantly red in both galaxies,
T. E. Armandroff, G. S. Da Costa
openalex +4 more sources
Discovery of Radio/X-ray/Optical Resolved Supernova Remnants in the Center of the Andromeda Galaxy [PDF]
Astrophys.J. 590 (2003) L21-L24, 2003 We have detected a spatially resolved supernova remnant (SNR) in the center of the Andromeda Galaxy, in radio, X-ray, and optical wavelengths. These observations provide the highest spatial resolution imaging of a radio/X-ray/optical SNR in that galaxy to date. The multi-wavelength morphology, radio spectral index, X-ray colors, and narrow-band optical
A. K. H. Kong +7 more
arxiv +3 more sources
Are Disks of Satellites Comprised of Tidal Dwarf Galaxies? [PDF]
Galaxies, 2021 It was found that satellites of nearby galaxies can form flattened co-rotating structures called disks of satellites or planes of satellites. Their existence is not expected by the current galaxy formation simulations in the standard dark matter-based ...
Michal Bílek +3 more
doaj +2 more sources
Radiation burst by axion star collision with star in the Andromeda Galaxy [PDF]
Physics Letters B, 2022 Axion is a promising candidate of dark matter in the universe. A fraction of dark matter axion may form axion star with radius ∼102 km. We show that the axion star emits radiation burst by the collision with K and M types main sequence star in the ...
Aiichi Iwazaki
doaj +2 more sources
Kinematics and Metallicity of the Dwarf Spheroidal Galaxy Andromeda XVIII [PDF]
The Astrophysical JournalAndromeda XVIII is an isolated dwarf galaxy 579 kpc away from the nearest large galaxy, M31. It is a candidate “backsplash galaxy” that might have been affected by a close passage to M31.
Kateryna A. Kvasova +2 more
doaj +2 more sources
The Possibility of Detecting Planets in the Andromeda Galaxy [PDF]
The Astrophysical Journal, 2006 total 8 pages, including 8 figures, ApJ ...
Sun‐Ju Chung +9 more
openalex +6 more sources
Hypervelocity Stars from the Andromeda Galaxy [PDF]
Monthly Notices of the Royal Astronomical Society, 2008 Hypervelocity stars (HVSs) discovered in the Milky Way (MW) halo are thought to be ejected from near the massive black hole (MBH) at the galactic centre.
Abraham Loeb +16 more
core +6 more sources
MEGA: Microlensing Exploration of the Galaxy and Andromeda [PDF]
Symposium - International Astronomical Union, 2004 Microlensing surveys have ruled out that the dark halos of the Milky Way and M31 are composed entirely of massive compact halo objects (MACHOs) for a wide range of MACHO masses. We have tried using the Subaru telescope to improve the limit on Moon-mass MACHOs, which is the lowest decade in MACHO mass that can be probed by microlensing.
David R. Alves +5 more
openalex +4 more sources
The remnant of a merger between two dwarf galaxies in Andromeda II [PDF]
Nature, 2014 Driven by gravity, massive structures like galaxies and clusters of galaxies are believed to grow continuously through hierarchical merging and accretion of smaller systems. Observational evidence of accretion events is provided by the coherent stellar streams crossing the outer haloes of massive galaxies, such as the Milky Way or Andromeda. At similar
Glenn Van De Ven
exaly +2 more sources