Foreground effect on the $J$-factor estimation of classical dwarf spheroidal galaxies

Abstract

The gamma-ray observation of the dwarf spheroidal galaxies (dSphs) is a promising approach to search for the dark matter annihilation (or decay) signal. The dSphs are the nearby satellite galaxies with a clean environment and dense dark matter halo so that they give stringent constraints on the 1 TeV dark matter. However, recent studies have revealed that current estimation of astrophysical factors relevant for the dark matter searches are not conservative, where the various non-negligible systematic uncertainties are not taken into account. Among them, the effect of foreground stars on the astrophysical factors has not been paid much attention, which becomes more important for deeper and wider stellar surveys in the future. In this article, we assess the effects of the foreground contamination by generating the mock samples of stars and using a model of future spectrographs. We investigate various data cuts to optimize the quality of the data and find that the cuts on the velocity and surface gravity can efficiently eliminate the contamination. We also propose a new likelihood function which includes the foreground distribution function. We apply this likelihood function to the fit of the three types of the mock data (Ursa Minor, Draco with large dark matter halo, and Draco with small halo) and three cases of the observation. The likelihood successfully reproduces the input $J$-factor value while the fit without considering the foreground distribution gives large deviation from the input value by a factor of three.

References in corpus (58)

• Planck 2015 results. XIII. Cosmological parameters
• The Sloan Digital Sky Survey: Technical Summary
• A Universal Density Profile from Hierarchical Clustering
• A Brief Introduction to PYTHIA 8.1
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Supersymmetric Dark Matter
• A direct empirical proof of the existence of dark matter
• HERWIG 6.5: an event generator for Hadron Emission Reactions With Interfering Gluons (including supersymmetric processes)
• The observed properties of dwarf galaxies in and around the Local Group
• Dark Matter Candidates from Particle Physics and Methods of Detection
• The Structure of Dark Matter Haloes in Dwarf Galaxies
• Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi-LAT Data
• The Kinematics of the Ultra-Faint Milky Way Satellites: Solving the Missing Satellite Problem
• Triaxial Modeling of Halo Density Profiles with High-resolution N-body Simulations
• PPPC 4 DM ID: A Poor Particle Physicist Cookbook for Dark Matter Indirect Detection
• Extragalactic Science, Cosmology and Galactic Archaeology with the Subaru Prime Focus Spectrograph (PFS)
• A Universal Mass Profile for Dwarf Spheroidal Galaxies?
• Analytical Models For Galactic Nuclei
• The Updated Zwicky Catalog (UZC)
• Dark Matter Scaling Relations
• Multi-Element Abundance Measurements from Medium-Resolution Spectra. III. Metallicity Distributions of Milky Way Dwarf Satellite Galaxies
• Strong and weak lensing united III: Measuring the mass distribution of the merging galaxy cluster 1E0657-56
• Dark matter in elliptical galaxies: II. Estimating the mass within the virial radius
• Dark matter distribution in the Coma cluster from galaxy kinematics: breaking the mass-anisotropy degeneracy
• A Complete Spectroscopic Survey of the Milky Way Satellite Segue 1: The Darkest Galaxy
• Internal Kinematics of the Fornax Dwarf Spheroidal Galaxy
• The Velocity Dispersion Profile of the Remote Dwarf Spheroidal Galaxy Leo I: A Tidal Hit and Run?
• Accurate Stellar Kinematics at Faint Magnitudes: application to the Bootes~I dwarf spheroidal galaxy
• Dwarf galaxy annihilation and decay emission profiles for dark matter experiments
• 4MOST - 4-metre Multi-Object Spectroscopic Telescope
• Dark matter annihilation and decay in dwarf spheroidal galaxies: The classical and ultrafaint dSphs
• Evidence in Virgo for the Universal Dark Matter Halo
• Stellar Kinematics and Metallicities in the Ultra-Faint Dwarf Galaxy Reticulum II
• Segue 2: The Least Massive Galaxy
• Prime Focus Spectrograph (PFS) for the Subaru Telescope: Overview, recent progress, and future perspectives
• Clean Kinematic Samples in Dwarf Spheroidals: An Algorithm for Evaluating Membership and Estimating Distribution Parameters When Contamination is Present
• Spectroscopic Confirmation of the Dwarf Galaxies Hydra II and Pisces II and the Globular Cluster Laevens 1
• Stellar kinematics in the remote Leo II dwarf spheroidal galaxy -- Another brick in the wall
• Indirect Dark Matter Detection from Dwarf Satellites: Joint Expectations from Astrophysics and Supersymmetry
• A Robust Determination of Milky Way Satellite Properties using Hierarchical Mass Modeling
• Revisiting the influence of unidentified binaries on velocity dispersion measurements in ultra-faint stellar systems
• Spherical Jeans analysis for dark matter indirect detection in dwarf spheroidal galaxies - Impact of physical parameters and triaxiality
• Dark matter annihilation and decay from non-spherical dark halos in the Galactic dwarf satellites
• Bayesian analysis of resolved stellar spectra: application to MMT/Hectochelle Observations of the Draco dwarf spheroidal
• The Mass-to-Light Ratios of the Draco and Ursa Minor Dwarf Spheroidal Galaxies. II. The Binary Population and Its Effect in the Measured Velocity Dispersions of Dwarf Spheroidal Galaxies
• A photometric and spectroscopic study of the new dwarf spheroidal galaxy in Hercules
• Dynamical models with a general anisotropy profile
• Leo V: Spectroscopy of a Distant and Disturbed Satellite
• A critical reassessment of particle Dark Matter limits from dwarf satellites
• Triangulum II: a very metal-poor and dynamically hot stellar system
• The shape of dark matter subhalos in the Aquarius simulations
• Wino Dark Matter and Future dSph Observations
• Prime Focus Spectrograph for the Subaru telescope: massively multiplexed optical and near-infrared fiber spectrograph
• Contamination of stellar-kinematic samples and uncertainty about dark matter annihilation profiles in ultrafaint dwarf galaxies: the example of Segue I
• Binary populations in Milky Way satellite galaxies: constraints from multi-epoch data in the Carina, Fornax, Sculptor and Sextans dwarf spheroidal galaxies
• Reliability of Monte Carlo event generators for gamma ray dark matter searches
• Searches for HI in the Outer Parts of Four Dwarf Spheroidal Galaxies
• MOONS: a Multi-Object Optical and Near-infrared Spectrograph for the VLT

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