Stellar mass map and dark matter distribution in M 31

  title={Stellar mass map and dark matter distribution in M 31},
  author={Antti Tamm and Elmo Tempel and Peeter Tenjes and Olga Tihhonova and Taavi Tuvikene},
  journal={Astronomy and Astrophysics},
Aims. Stellar mass distribution in the Andromeda galaxy (M 31) is estimated using optical and near-infrared imaging data. Combining the derived stellar mass model with various kinematical data, properties of the dark matter (DM) halo of the galaxy are constrained. Methods. SDSS observations through the ugriz filters and the Spitzer imaging at 3.6 microns are used to sample the spectral energy distribution (SED) of the galaxy at each imaging pixel. Intrinsic dust extinction effects are taken… 

Fermi-LAT Observations of γ-Ray Emission toward the Outer Halo of M31

Evidence is found for an extended excess that appears to be distinct from the conventional MW foreground, having a total radial extension upward of ~120-200 kpc from the center of M31, and plausible interpretations of the excess emission are discussed.

Detecting axion dark matter with radio lines from neutron star populations

It has been suggested that radio telescopes may be sensitive to axion dark matter that resonantly converts to radio photons in the magnetospheres surrounding neutron stars (NSs). In this work, we

The Fermi-LAT GeV excess as a tracer of stellar mass in the Galactic bulge

An anomalous emission component at energies of a few gigaelectronvolts and located towards the inner Galaxy is present in the Fermi-LAT data. At present, the two most promising explanations are the

Search for γ -ray emission from dark matter particle interactions from the Andromeda and Triangulum galaxies with the Fermi Large Area Telescope

The Andromeda (M31) and Triangulum (M33) galaxies are the closest Local Group galaxies to the Milky Way, being only 785 and 870 kpc away. These two galaxies provide an independent view of high-energy

Investigating the dark matter minispikes with the gamma-ray signal from the halo of M31

Recently, the evidence for gamma-ray emission has been found in the FermiLAT observation for the outer halo of Andromeda galaxy (M31). The dark matter (DM) annihilation offers a possible explanation

On Cepheid Distance Scale Bias Due to Stellar Companions and Cluster Populations

State-of-the-art photometric measurements of extragalactic Cepheids account for the mean additional light due to chance superposition of Cepheids on crowded backgrounds through the use of artificial

Gamma-ray image reconstruction of the Andromeda galaxy

We analyze about 12 years of Fermi-LAT data in the direction of the Andromeda galaxy (M31). We robustly characterize its spectral and morphological properties against systematic uncertainties related

The Andromeda galaxy’s most important merger about 2 billion years ago as M32’s likely progenitor

Although the proximity of the Andromeda galaxy (M31) offers an opportunity to understand how mergers affect galaxies1, uncertainty remains about M31’s most important mergers. Previous studies focused

An excess of excesses examined via dark matter radio emissions from galaxies

  • G. Beck
  • Physics
    Journal of Cosmology and Astroparticle Physics
  • 2019
Cosmic-ray and gamma-ray observations have yielded several notable excesses that often lend themselves to explanation by various dark matter annihilation/decay models. In particular, the AMS-02


The formation and evolution of dark matter and galaxies is one of the basic topics in cosmological research. This thesis uses numerical simulation to study the evolution of the universe under the



Dust-corrected surface photometry of M 31 from Spitzer far-infrared observations

Aims. We create a model for recovering the intrinsic, absorption-corrected surface brightness distribution of a galaxy and apply the model to the nearby galaxy M 31. Methods. We constructed a

The Masses of the Milky Way and Andromeda galaxies

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

A revised Λ CDM mass model for the Andromeda Galaxy

We present an updated mass model for M31 that makes use of a Spitzer 3.6-μm image, a mass-to-light ratio gradient based on the galaxy's B - R colour profile, and observed rotation curve data from a

Mass Models for Low Surface Brightness Galaxies with High-Resolution Optical Velocity Fields

We present high-resolution optical velocity fields from DensePak integral field spectroscopy, along with derived rotation curves, for a sample of low surface brightness galaxies. In the limit of no

VLT/VIMOS Integral-field kinematics of the giant low surface brightness galaxy ESO 323-G064

Aims:We have studied the bulge and the disk kinematics of the giant low surface brightness galaxy ESO 323-G064 in order to investigate its dynamical properties and the radial mass profile of the dark


Analysis of the rotation curves (RCs) of spiral galaxies provides an efficient diagnostic for studying the properties of dark matter halos and their relations with baryonic material. Since the cored

The Observed Properties of Dark Matter on Small Spatial Scales

A synthesis of recent photometric and kinematic data for several of the most dark matter dominated galaxies, the dwarf spheroidal Galactic satellites, and compare them to star clusters provides new information about the nature of the dominant form of dark matter.

NGC 3741: the dark halo profile from the most extended rotation curve

We present new H i observations of the nearby dwarf galaxy NGC 3741. This galaxy has an extremely extended H i disc, which allows us to trace the rotation curve out to unprecedented distances in

SDSS surface photometry of M 31 with absorption corrections

Aims. The objective of this work is to obtain an extinction-corrected distribution of optical surface brightness and colour i ndices of the large nearby galaxy M 31 using homogeneous observational


We present rotation curves of 19 galaxies from The H i Nearby Galaxy Survey (THINGS). The high spatial and velocity resolution of THINGS make these the highest quality H i rotation curves available