31 citations · 145 across the 21 of their papers we have counts for
21 papers
A Detailed View of the Large-Scale Sloshing Cold Front in RXJ2014.8-2430
M. J. Sundquist, S. A. Walker, M. S. Mirakhor
We analyze our new 144 ks deep Chandra observation of the sloshing cold front cluster RXJ2014.8-2430. Previous observations of RXJ2014.8-2430 with XMM-Newton shows evidence of a la…
X-ray emission in IllustrisTNG circum-cluster environments. II -- Possible origins of the soft X-ray excess emission
Celine Gouin, Daniela Galárraga-Espinosa, Massimiliano Bonamente +9
An excess of soft X-ray emission (0.2-1 keV) above the contribution from the hot intra-cluster medium (ICM) has been detected in a number of galaxy clusters, including the Coma clu…
NuSTAR Observations of the Galaxy Cluster Abell 3667
Mohammad S. Mirakhor, Stephen A. Walker
We present an analysis of the hard X-ray emission from the central region of Abell 3667 using deep NuSTAR observations. While previous studies on the nature of the hard X-ray exces…
A rare, strong shock front in the merging cluster SPT-CL J2031-4037
Purva Diwanji, Stephen A. Walker, Mohammad S. Mirakhor
We present our findings from the new deep Chandra observations ( ks) of the merging galaxy cluster SPT-CL J2031-4037 at . Our observations reveal intricate structure…
Unveiling the Bulge-Disc Structure, AGN Feedback, and Baryon Landscape in a Massive Spiral Galaxy with Mpc-Scale Radio Jets
Joydeep Bagchi, Shankar Ray, Suraj Dhiwar +9
This study delves into the bulge-disc components and stellar mass distribution in the fast-rotating, highly massive spiral galaxy 2MASX~J23453268-0449256, distinguished by extraord…
Exploring chemical enrichment of the intracluster medium with the Line Emission Mapper
François Mernier, Yuanyuan Su, Maxim Markevitch +27
Synthesized in the cores of stars and supernovae, most metals disperse over cosmic scales and are ultimately deposited well outside the gravitational potential of their host galaxi…
Two large-scale sloshing cold fronts in the outskirts of the galaxy cluster Abell 3558
M. S. Mirakhor, S. A. Walker, M. Sundquist +1
Previous studies of the massive nearby galaxy cluster Abell 3558 reported a cold front around the cluster core, which is attributed to the sloshing of the core as it responds to th…
Soft X-ray emission from warm gas in IllustrisTNG circum-cluster environments
Celine Gouin, Massimiliano Bonamente, Daniela Galarraga-Espinosa +2
Context. Whereas X-ray clusters are extensively used for cosmology, their idealistic modelling, through the hypotheses of spherical symmetry and hydrostatic equilibrium, are more a…
A deep dive: Chandra observations of the NGC 4839 group falling into the Coma cluster
M. S. Mirakhor, S. A. Walker, J. Runge
Cosmological simulations of structure formation predict that galaxy clusters continue to grow and evolve through ongoing mergers with group-scale systems. During these merging even…
Possible non-thermal origin of the hard X-ray emission in the merging galaxy cluster SPT-CL J2031-4037
M. S. Mirakhor, S. A. Walker, J. Runge +1
Non-thermal emission from clusters of galaxies at the high-energy X-ray regime has been searched with various instruments, but the detection significance of this emission has yet b…
Hubble Space Telescope Captures UGC~12591: Bulge/Disc Properties, Star Formation and `Missing Baryons' Census in a Very Massive and Fast Spinning Hybrid Galaxy
Shankar Ray, Joydeep Bagchi, Suraj Dhiwar +4
We present Hubble Space Telescope (HST) observations of the nearby, massive, highly rotating hybrid galaxy UGC~12591, along with observations in UV to FIR bands. HST data in V, I,…
The unusually high dark matter concentration of the galaxy group NGC 1600
J. Runge, S. A. Walker, M. S. Mirakhor
We investigate the properties of the dark matter (DM) halo surrounding the nearby galaxy group NGC 1600. Through the use of deep (252 ks) Chandra observations and 64.3 ks of XMM-Ne…
A detailed study of the bridge of excess X-ray emission between the galaxy clusters Abell 2029 and Abell 2033
M. S. Mirakhor, S. A. Walker, J. Runge
We examine Suzaku, XMM-Newton, and Chandra observations of the Abell 2029/2033 system to investigate the nature of a bridge of X-ray emission joining the two galaxy clusters. By mo…
Gas clumping in the outskirts of the Virgo cluster
M. S. Mirakhor, S. A. Walker
Observations of the ICM in the outskirts of the Virgo cluster with Suzaku have found the gas mass fraction in the northern direction to be significantly above the expected level, i…
Probing ultra-diffuse galaxies out to the virial radius of the Coma cluster with XMM-Newton
M. S. Mirakhor, S. A. Walker
We probe the formation scenarios and the active galactic nuclei (AGN) occupation fraction of ultra-diffuse galaxies (UDGs) in the nearby Coma cluster by utilizing XMM-Newton observ…
Exploring the hot gaseous halo around an extremely massive and relativistic jet launching spiral galaxy with XMM-Newton
M. S. Mirakhor, S. A. Walker, J. Bagchi +6
We present a deep XMM-Newton observation of the extremely massive, rapidly rotating, relativistic-jet-launching spiral galaxy 2MASX J23453268-0449256. Diffuse X-ray emission from t…
A high coverage view of the thermodynamics and metal abundance in the outskirts of the nearby galaxy cluster Abell 2199
M. S. Mirakhor, S. A. Walker
We present a joint Suzaku and XMM-Newton analysis of the outskirts of the nearby galaxy cluster Abell 2199, the only nearby galaxy cluster to be observed with near complete azimuth…
A complete view of the outskirts of the Coma cluster
M. S. Mirakhor, S. A. Walker
We present a new extended XMM-Newton mosaic of the nearby Coma cluster, which covers the cluster out to the virial radius with nearly complete azimuthal coverage. This large mosaic…
Is there an enormous cold front at the virial radius of the Perseus cluster?
S. A. Walker, M. S. Mirakhor, J. ZuHone +3
We present new XMM-Newton observations extending the mosaic of the Perseus cluster out to the virial radius to the west. Previous studies with ROSAT have reported a large excess in…
Properties of the Intracluster Medium Assuming an Einasto Dark Matter Profile
Mohammad S. Mirakhor
I investigate an analytical model of galaxy clusters based on the assumption that the intracluster medium plasma is polytropic and is in hydrostatic equilibrium. The Einasto profil…
The gas distribution in the high-redshift cluster MS 1054-0321
M. S. Mirakhor, M. Birkinshaw
We investigate the gas mass distribution in the high redshift cluster MS 1054-0321 using Chandra X-ray and OCRA SZ effect data. We use a superposition of offset -type models to…