Constraining the Milky Way Mass with Its Hot Gaseous Halo

Abstract

We propose a novel method to constrain the Milky Way (MW) mass $M_{\mathrm{vir}}$ with its corona temperature observations. For a given corona density profile, one can derive its temperature distribution assuming a generalized equilibrium model with non-thermal pressure support. While the derived temperature profile decreases substantially with radius, the X-ray-emission-weighted average temperature, which depends most sensitively on $M_{\mathrm{vir}}$, is quite uniform toward different sight lines, consistent with X-ray observations. For an Navarro-Frenk-White (NFW) total matter distribution, the corona density profile should be cored, and we constrain $M_{\mathrm{vir}}=(1.19$ - $2.95)\times 10^{12}{M}_{\mathrm{sun}}$. For a total matter distribution contributed by an NFW dark matter profile and central baryons, the corona density profile should be cuspy and $M_{\mathrm{vir},\mathrm{dm}}=(1.34$ - $5.44)\times 10^{12}{M}_{\mathrm{sun}}$. Non-thermal pressure support leads to even higher values of $M_{\mathrm{vir}}$, while a lower MW mass may be possible if the corona is accelerating outward. This method is independent of the total corona mass, its metallicity, and temperature at very large radii.

arXiv commentSignificantly revised version, accepted for publication in ApJ Letters. Discussions largely expanded. 7 pages, 4 figures

References in corpus (48)

• Planck 2015 results. XIII. Cosmological parameters
• A Universal Density Profile from Hierarchical Clustering
• The Structure of Cold Dark Matter Halos
• Collisional Plasma Models with APEC/APED: Emission Line Diagnostics of Hydrogen-like and Helium-like Ions
• The Galaxy in Context: Structural, Kinematic and Integrated Properties
• Chandra sample of nearby relaxed galaxy clusters: mass, gas fraction, and mass-temperature relation
• Cosmological Parameters from Observations of Galaxy Clusters
• The mass distribution and gravitational potential of the Milky Way
• Giant Gamma-ray Bubbles from Fermi-LAT: AGN Activity or Bipolar Galactic Wind?
• Dark matter halo concentrations in the Wilkinson Microwave Anisotropy Probe year 5 cosmology
• Formation of Galaxy Clusters
• The Milky Way's bright satellites as an apparent failure of LCDM
• The Milky Way's Circular Velocity Curve to 60 kpc and an Estimate of the Dark Matter Halo Mass from Kinematics of ~2400 SDSS Blue Horizontal Branch Stars
• The Cores of Dwarf Galaxy Halos
• Updated Atomic Data and Calculations for X-ray Spectroscopy
• Multi-Phase Galaxy Formation: High Velocity Clouds and the Missing Baryon Problem
• The formation of disc galaxies in high resolution moving-mesh cosmological simulations
• The Large-scale Bipolar Wind in the Galactic Center
• Constraining the Milky Way's Hot Gas Halo with OVII and OVII Emission Lines
• On the nature of hydrostatic equilibrium in galaxy clusters
• Universal thermodynamic properties of the intracluster medium over two decades in radius in the X-COP sample
• The Fermi Bubbles. I. Possible Evidence for Recent AGN Jet Activity in the Galaxy
• The Space Motion of Leo I: The Mass of the Milky Way's Dark Matter Halo
• Non-thermal pressure support in X-COP galaxy clusters
• Hydrodynamic Simulation of Non-thermal Pressure Profiles of Galaxy Clusters
• Energy Spectra of the Soft X-ray Diffuse Emission in Fourteen Fields Observed with Suzaku
• X-ray coronae in simulations of disc galaxy formation
• Ram Pressure Stripping of the Large Magellanic Cloud's Disk as a Probe of the Milky Way's Circumgalactic Medium
• The Extended Distribution of Baryons Around Galaxies
• Unveiling the corona of the Milky Way via ram-pressure stripping of dwarf satellites
• The mass of our Milky Way
• Early formation and recent starburst activity in the nuclear disc of the Milky Way
• Suzaku observations of the diffuse x-ray emission across the fermi bubbles' edges
• An XMM-Newton Survey of the Soft X-ray Background. III. The Galactic Halo X-ray Emission
• On the Hot Gas Content of the Milky Way Halo
• NIHAO IX: the role of gas inflows and outflows in driving the contraction and expansion of cold dark matter haloes
• Spatial distribution of the Milky Way hot gaseous halo constrained by Suzaku X-ray observations
• The Rotation of the Hot Gas Around the Milky Way
• Deviations from hydrostatic equilibrium in the circumgalactic medium: spinning hot haloes and accelerating flows
• Milky Way mass constraints from the Galactic satellite gap
• X-ray and UV spectroscopy of Galactic diffuse hot gas along the LMC X--3 sight line
• Multiple temperature components of the hot circumgalactic medium of the Milky Way
• Circumgalactic Oxygen Absorption and Feedback
• Simulating the Fermi Bubbles as Forward Shocks Driven by AGN Jets
• Reversing cooling flows with AGN jets: shock waves, rarefaction waves, and trailing outflows
• Diffuse coronae in cosmological simulations of Milky Way-sized galaxies
• Determination of Dark Matter Halo Mass from Dynamics of Satellite Galaxies
• On the Cooling Flow Problem in the Gaseous Halo of the Milky Way

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