A test of MOND and Emergent Gravity with SMACS J0723.3-7327 using eROSITA observations

Abstract

We implement a test of MOND and Verlinde's Emergent Gravity using the galaxy cluster SMACS J0723-7327, which has been recently imaged using the eROSITA X-ray telescope as well as with JWST. We test MOND using two independent methods. The first method involves comparing the dynamical MOND mass and baryonic mass, while the second method entails a comparison of the MOND-estimated temperature with the observed temperature. We then compare the unseen mass predicted by Emergent Gravity with the estimated dark matter mass. We find that MOND shows a mass discrepancy in the central regions at high significance levels. The observed temperature profile is in marginal disagreement with that in the MOND paradigm. However, the Emergent Gravity Theory agrees in accurately accounting for the dynamical mass in the inner regions within $1\sigma$. Our results are qualitatively consistent with the earlier tests on other clusters.

17 pages, 3 figures. Accepted for publication in JCAP

References in corpus (30)

• The eROSITA X-ray telescope on SRG
• The Radial Acceleration Relation in Rotationally Supported Galaxies
• A new relativistic theory for Modified Newtonian Dynamics
• From galactic bars to the Hubble tension: weighing up the astrophysical evidence for Milgromian gravity
• X-ray Group and cluster mass profiles in MOND: Unexplained mass on the group scale
• The Beginning and Evolution of the Universe
• Cosmology and Convention
• The Weak Lensing Radial Acceleration Relation: Constraining Modified Gravity and Cold Dark Matter theories with KiDS-1000
• Unscrambling the lensed galaxies in JWST images behind SMACS0723
• The eROSITA Final Equatorial-Depth Survey (eFEDS): Galaxy Clusters and Groups in Disguise
• MOND plus classical neutrinos not enough for cluster lensing
• Testing Verlinde's Emergent Gravity with the Radial Acceleration Relation
• The gravitational field of X-COP galaxy clusters
• First JWST observations of a gravitational lens: Mass model from new multiple images with near-infrared observations of SMACS J0723.3-7327
• A study of the hydrostatic mass bias dependence and evolution within The Three Hundred clusters
• The radial acceleration relation in a $\Lambda$CDM universe
• Nonlocal Metric Realizations of MOND
• Determining Cosmology for a Nonlocal Realization of MOND
• Yet another test of Radial Acceleration Relation for galaxy clusters
• X-ray analysis of JWST's first galaxy cluster lens SMACS J0723.3-7327
• Dark matter-baryons separation at the lowest mass scale: the Bullet Group
• A tight scaling relation of dark matter in galaxy clusters
• Testing Emergent Gravity on Galaxy Cluster Scales
• Scaling relations for dark matter core density and radius from Chandra X-ray cluster sample
• A test of constancy of dark matter halo surface density and radial acceleration relation in relaxed galaxy groups
• A test of Radial Acceleration Relation for the {\it Giles et al Chandra} cluster sample
• There is no universal acceleration scale in galaxies
• A test of invariance of dark matter halo surface density using multiwavelength mock galaxy catalogues
• Rotation curves and the dark matter problem
• A test of linearity of the ratio of dark matter to baryonic matter in galaxy clusters