Publications (20)
Probing Macro-Scale Gas Motions and Turbulence in Diffuse Cosmic Plasmas
Esra Bulbul, Massimo Gaspari, Gabriella Alvarez +31
Clusters of galaxies, the largest collapsed structures in the Universe, are located at the intersection of extended filaments of baryons and dark matter. Cosmological accretion ont…
PSZ2 G181.06+48.47 II: radio analysis of a low-mass cluster with exceptionally-distant radio relics
Kamlesh Rajpurohit, Andra Stroe, Ewan O'Sullivan +13
We report upgraded Giant Metrewave Radio Telescope and Karl J. Jansky Very Large Array radio observations of a low-mass merging galaxy cluster PSZ2 G181.06+48.47. This exceptional…
PSZ2 G181.06+48.47 I: X-ray exploration of a low-mass cluster with exceptionally-distant radio relics
Andra Stroe, Kamlesh Rajpurohit, Zhenlin Zhu +13
Relics are diffuse, highly-polarized radio sources that trace merger-driven shocks at the periphery of merging galaxy clusters. The LOFAR survey recently discovered a rare example…
Mapping the imprints of stellar and AGN feedback in the circumgalactic medium with X-ray microcalorimeters
Gerrit Schellenberger, Ãkos Bogdán, John A. ZuHone +24
The Astro2020 Decadal Survey has identified the mapping of the circumgalactic medium (CGM, gaseous plasma around galaxies) as a key objective. We explore the prospects for characte…
Joint Suzaku and Chandra observations of the MKW4 galaxy group out to the virial radius
Arnab Sarkar, Yuanyuan Su, Scott Randall +5
We present joint Suzaku and Chandra observations of MKW4. With a global temperature of 1.6 keV, MKW4 is one of the smallest galaxy groups that have been mapped in X-rays out to the…
X-Ray morphological analysis of the Planck ESZ clusters
Lorenzo Lovisari, William R. Forman, Christine Jones +7
X-ray observations show that galaxy clusters have a very large range of morphologies. The most disturbed systems which are good to study how clusters form and grow and to test phys…
Constraints on Non-Thermal Pressure at galaxy cluster outskirts from a Joint SPT and XMM-Newton Analysis
Arnab Sarkar, Michael McDonald, Lindsey Bleem +11
We present joint South Pole Telescope (SPT) and XMM-Newton observations of 8 massive galaxy clusters (0.8--1.710 M) spanning a redshift range of 0.16 to 0.…
Line Emission Mapper (LEM): Probing the physics of cosmic ecosystems
Ralph Kraft, Maxim Markevitch, Caroline Kilbourne +107
The Line Emission Mapper (LEM) is an X-ray Probe for the 2030s that will answer the outstanding questions of the Universe's structure formation. It will also provide transformative…
Gas sloshing and cold fronts in pre-merging galaxy cluster Abell 98
Arnab Sarkar, Scott Randall, Yuanyuan Su +10
We present deep Chandra observations of the pre-merger galaxy cluster Abell 98. Abell 98 is a complex merging system. While the northern (A98N) and central subclusters (A98S) are m…
SDSS-C4 3028: The Nearest Blue Galaxy Cluster Devoid of an Intracluster Medium
Shweta Jain, Yuanyuan Su, Andra Stroe +9
SDSS-C4 3028 is a galaxy cluster at , notable for its unusually high fraction of star-forming galaxies with 19 star-forming and 11 quiescent spectroscopically-confirmed me…
On the Particle Acceleration Mechanisms in a Double Radio Relic Galaxy Cluster, Abell 1240
Arnab Sarkar, Felipe Andrade-Santos, Reinout J. van Weeren +12
We present a 368 ks deep Chandra observation of Abell~1240, a binary merging galaxy cluster at a redshift of 0.195 with two Brightest Cluster Galaxies (BCGs) may have passed each o…
Multi-frequency Radio Observations of the Dissociative Cluster Merger CIZA J0107.7+5408
Emma Schwartzman, Tracy Clarke, Simona Giacintucci +9
We present new radio observations of the galaxy cluster merger CIZA J0107.7+5408 (CIZA0107), a large, roughly equal mass, post-core passage, dissociative binary system at z = 0.106…
Chemical abundances in the outskirts of nearby galaxy groups measured with joint Suzaku and Chandra observations
Arnab Sarkar, Yuanyuan Su, Nhut Truong +5
We report results from deep Suzaku and mostly snapshot Chandra observations of four nearby galaxy groups: MKW4, Antlia, RXJ1159+5531, and ESO3060170. Their peak temperatures vary o…
A Deep Chandra View of Abell 2597: Bubbles, Shocks, Cold Fueling, and a Plasma Depletion Layer
Osase Omoruyi, Grant Tremblay, Stefi A. Baum +14
To examine how AGN feedback shapes the intracluster medium (ICM) and fuels black hole accretion in the cool-core galaxy cluster Abell 2597, we present deep (600 ks) Chandra X…
Strong and weak lensing united III: Measuring the mass distribution of the merging galaxy cluster 1E0657-56
Marusa Bradac, Douglas Clowe, Anthony H. Gonzalez +7
The galaxy cluster 1E0657-56 (z = 0.296) is remarkably well-suited for addressing outstanding issues in both galaxy evolution and fundamental physics. We present a reconstruction o…
X-ray scaling relations for a representative sample of Planck selected clusters observed with XMM-Newton
Lorenzo Lovisari, Gerrit Schellenberger, Mauro Sereno +7
We report the scaling relations derived by fitting the X-ray parameters determined from analyzing the XMM-Newton observations of 120 galaxy clusters in the Planck Early Sunyaev-Zel…
Stripped elliptical galaxies as probes of ICM physics: III. Deep Chandra Observation of NGC 4552 - Measuring the Viscosity of the Intracluster Medium
Ralph Kraft, Elke Roediger, Marie Machacek +7
We present results from a deep (200 ks) Chandra observation of the early-type galaxy NGC 4552 (M89) which is falling into the Virgo cluster. Previous shallower X-ray observations o…
The deepest view of RBS 797: evidence for two pairs of equidistant X-ray cavities
Francesco Ubertosi, Myriam Gitti, Fabrizio Brighenti +14
We present the first results of a deep observation of the galaxy cluster RBS 797, whose previous X-ray studies revealed two pronounced X-ray cavities in the east-west (E-…
Young AGN outburst running over older X-ray cavities
Akos Bogdan, Reinout J. van Weeren, Ralph P. Kraft +8
Although the energetic feedback from active galactic nuclei (AGN) is believed to have a profound effect on the evolution of galaxies and clusters of galaxies, details of the AGN he…
Discovery of a pre-merger shock in an intercluster filament in Abell 98
Arnab Sarkar, Scott Randall, Yuanyuan Su +11
We report the first unambiguous detection of an axial merger shock in the early-stage merging cluster Abell 98 using deep (227 ks) Chandra observations. The shock is about 420 kpc…