Constraining the Physical State of the Hot Gas Halos in NGC 4649 and NGC 5846

Abstract

We present results of a joint \textit{Chandra}/\textit{XMM-Newton} analysis of the early-type galaxies NGC 4649 and NGC 5846 aimed at investigating differences between mass profiles derived from X-ray data and those from optical data, to probe the state of the hot ISM in these galaxies. If the hot ISM is at a given radius in hydrostatic equilibrium (HE) the X-ray data can be used to measure the total enclosed mass of the galaxy. Differences from optically-derived mass distributions therefore yield information about departures from HE in the hot halos. The X-ray mass profiles in different angular sectors of NGC 4649 are generally smooth with no significant azimuthal asymmetries within \(12\) kpc. Extrapolation of these profiles beyond this scale yields results consistent with the optical estimate. However, in the central region (\(r < 3\) kpc) the X-ray data underpredict the enclosed mass, when compared with the optical mass profiles. Consistent with previous results we estimate a non-thermal pressure component accounting for \(30\%\) of the gas pressure, likely linked to nuclear activity. In NGC 5846 the X-ray mass profiles show significant azimuthal asymmetries, especially in the NE direction. Comparison with optical mass profiles in this direction suggests significant departures from HE, consistent with bulk gas compression and decompression due to sloshing on \(\sim 15\) kpc scales; this effect disappears in the NW direction where the emission is smooth and extended. In this sector we find consistent X-ray and optical mass profiles, suggesting that the hot halo is not responding to strong non-gravitational forces.

arXiv comment38 pages, 26 figures, accepted for publication on ApJ

References in corpus (56)

• A Universal Density Profile from Hierarchical Clustering
• The epochs of early-type galaxy formation as a function of environment
• The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances
• The ATLAS3D project - III. A census of the stellar angular momentum within the effective radius of early-type galaxies: unveiling the distribution of Fast and Slow Rotators
• Shocks and cold fronts in galaxy clusters
• The Atlas3D project - XX. Mass-size and mass-sigma distributions of early-type galaxies: bulge fraction drives kinematics, mass-to-light ratio, molecular gas fraction and stellar initial mass function
• Absolute measurement of the unresolved cosmic X-ray background in the 0.5-8 keV band with Chandra
• The origin of cold fronts in the cores of relaxed galaxy clusters
• Non-hydrostatic gas in the core of the relaxed galaxy cluster A1795
• Dark Matter Contraction and the Stellar Content of Massive Early-type Galaxies: Disfavoring "Light" Initial Mass Functions
• Stirring Up the Pot: Can Cooling Flows In Galaxy Clusters Be Quenched By Gas Sloshing?
• X-ray Spectral Properties of Low-Mass X-ray Binaries in Nearby Galaxies
• Measuring Cluster Temperature Profiles with XMM/EPIC
• Measuring the non-thermal pressure in early type galaxy atmospheres: A comparison of X-ray and optical potential profiles in M87 and NGC1399
• Dark matter haloes determine the masses of supermassive black holes
• The XMM-Newton EPIC Background and the production of Background Blank Sky Event Files
• Gas sloshing, cold front formation, and metal redistribution: the Virgo cluster as a quantitative test case
• The Supermassive Black Hole and Dark Matter Halo of NGC 4649 (M60)
• Small scatter and nearly-isothermal mass profiles to four half-light radii from two-dimensional stellar dynamics of early-type galaxies
• XMM-Newton observation of the distant (z=0.6) galaxy cluster RX J1120.1+4318
• Populating the galaxy velocity dispersion - supermassive black hole mass diagram: A catalogue of (M_bh, sigma) values
• The ATLAS3D Project - XXI. Correlations between gradients of local escape velocity and stellar populations in early-type galaxies
• The NGC 5846 Group: Dynamics and the Luminosity Function to M_R=-12
• Estimating turbulent velocities in the elliptical galaxies NGC 5044 and NGC 5813
• XMM-Newton EPIC background modeling for extended sources
• X-ray Scaling Relation in Early-Type Galaxies: Dark Matter as a Primary Factor in Retaining Hot Gas
• Elliptical galaxy masses out to five effective radii: the realm of dark matter
• Comparison of an approximately isothermal gravitational potentials of elliptical galaxies based on X-ray and optical data
• The SLUGGS Survey: stellar kinematics, kinemetry and trends at large radii in 25 early-type galaxies
• Abundance gradients and the role of SNe in M87
• Stripped elliptical galaxies as probes of ICM physics: II. Stirred, but mixed? Viscous and inviscid gas stripping of the Virgo elliptical M89
• Stripped elliptical galaxies as probes of ICM physics: I. Tails, wakes, and flow patterns in and around stripped ellipticals
• Signatures of accretion events in the halos of early-type galaxies from comparing PNe and GCs kinematics
• Deep Chandra Observations of Edges and Bubbles in the NGC 5846 Galaxy Group
• The SLUGGS Survey: The mass distribution in early-type galaxies within five effective radii and beyond
• The SLUGGS Survey: Breaking degeneracies between dark matter, anisotropy and the IMF using globular cluster subpopulations in the giant elliptical NGC 5846
• Weighing the Quiescent Central Black Hole in an Elliptical Galaxy with X-ray Emitting Gas
• The Two-dimensional XMM-Newton Group Survey: z<0.012 groups
• The peculiar small-scale X-ray morphology of NGC 5846 observed with Chandra
• Steepening mass profiles, dark matter and environment of X-ray bright elliptical galaxies
• Using NMAGIC to probe the dark matter halo and orbital structure of the X-ray bright, massive elliptical galaxy, NGC 4649
• The radio properties of a complete, X-ray selected sample of nearby, massive elliptical galaxies
• AGN-Induced Cavities in NGC 1399 and NGC 4649
• A discrete chemo-dynamical model of the giant elliptical galaxy NGC 5846: dark matter fraction, internal rotation and velocity anisotropy out to six effective radii
• Reconciling optical and X-ray mass estimates: the case of the elliptical galaxy NGC3379
• Dark matter halos around isolated ellipticals
• Comparing X-ray and Dynamical Mass Profiles in the Early-Type Galaxy NGC 4636
• The Two-Dimensional Spatial Distributions of the Globular Clusters and Low-Mass X-Ray Binaries of NGC4649
• A SLUGGS and Gemini/GMOS combined study of the elliptical galaxy M60: wide-field photometry and kinematics of the globular cluster system
• Dark Matter in Elliptical Galaxies
• The radial distribution of X-ray Binaries and Globular Clusters in NGC 4649 and their relation with the local stellar mass density
• On the use of X-rays to determine dynamical properties of elliptical galaxies
• Gas Sloshing and Radio Galaxy Dynamics in the Core of the 3C449 Group
• Reconciling stellar dynamical and hydrostatic X-ray mass measurements of an elliptical galaxy with gas rotation, turbulence and magnetic fields
• An In-Depth Study of the Abundance Pattern in the Hot Interstellar Medium in NGC 4649
• Probing the kinematics of early-type galaxy halos using planetary nebulae

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