3.55 keV X-ray line signal from excited dark matter in radiative neutrino model
Physics Letters B, 2014 We study an exciting dark matter scenario in a radiative neutrino model to explain the X-ray line signal at 3.55 keV recently reported by XMN-Newton X-ray observatory using data of various galaxy clusters and Andromeda galaxy.
Hiroshi Okada, Takashi Toma
doaj +1 more source
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,
Armandroff, Taft E., Da Costa, Gary S.
openaire +2 more sources
The Detailed Star Formation History in the Spheroid, Outer Disk, and Tidal Stream of the Andromeda Galaxy [PDF]
, 2006 Using the Advanced Camera for Surveys on the Hubble Space Telescope, we have obtained deep optical images reaching stars well below the oldest main sequence turnoff in the spheroid, tidal stream, and outer disk of the Andromeda Galaxy.
Allen V. Sweigart +14 more
core +2 more sources
Dynamical Mass Estimates for the Halo of M31 from Keck Spectroscopy [PDF]
, 2000 The last few months have seen the measurements of the radial velocities of all of the dwarf spheroidal companions to the Andromeda galaxy (M31) using the spectrographs (HIRES and LRIS) on the Keck Telescope.
Eva K. Grebel +7 more
core +2 more sources
DESI Observations of the Andromeda Galaxy: Revealing the Immigration History of Our Nearest Neighbor
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
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The PAndAS view of the Andromeda satellite system - I. A Bayesian search for dwarf galaxies using spatial and color-magnitude information [PDF]
, 2013 We present a generic algorithm to search for dwarf galaxies in photometric catalogs and apply it to the Pan-Andromeda Archaeological Survey (PAndAS).
Fardal, Mark A. +7 more
core +1 more source
Ongoing Galactic Accretion: Simulations and Observations of Condensed Gas in Hot Halos [PDF]
, 2007 Ongoing accretion onto galactic disks has been recently theorized to progress via the unstable cooling of the baryonic halo into condensed clouds. These clouds have been identified as analogous to the High-Velocity Clouds (HVCs) observed in HI in our ...
Braun R. +7 more
core +1 more source
Systems biology of responses to simultaneous copper and iron deficiency in Arabidopsis
The Plant Journal, Volume 103, Issue 6, Page 2119-2138, September 2020., 2020 Summary Plant responses to coincident nutrient deficiencies cannot be predicted from the responses to individual deficiencies. Although copper (Cu) and iron (Fe) are essential micronutrients for plant growth that are often and concurrently limited in soils, the combinatorial response to Cu‐Fe deficiency remains elusive.
Antoni Garcia‐Molina +3 more
wiley +1 more source
RED SUPERGIANTS IN THE ANDROMEDA GALAXY (M31) [PDF]
The Astrophysical Journal, 2009 Red supergiants are a short-lived stage in the evolution of moderately massive stars (10-25Mo), and as such their location in the H-R diagram provides an exacting test of stellar evolutionary models. Since massive star evolution is strongly affected by the amount of mass-loss a star suffers, and since the mass-loss rates depend upon metallicity, it is ...
Massey, Philip +7 more
openaire +2 more sources
The Herschel Exploitation of Local Galaxy Andromeda (HELGA). I: Global far-infrared and sub-mm morphology [PDF]
, 2012 We have obtained Herschel images at five wavelengths from 100 to 500 micron of a ~5.5x2.5 degree area centred on the local galaxy M31 (Andromeda), our nearest neighbour spiral galaxy, as part of the Herschel guaranteed time project "HELGA".
A. Boselli +90 more
core +5 more sources