Publications (68)
X-ray Constraints on the Hot Gas Content of Early-type Galaxies in Virgo
Meicun Hou, Zhiyuan Li, Christine Jones +2
We present a systematic study of the diffuse hot gas around early-type galaxies (ETGs) residing in the Virgo cluster, based on archival {\it Chandra} observations. Our representati…
A New Class of X-Ray Tails of Early-Type Galaxies and Subclusters in Galaxy Clusters - Slingshot Tails vs Ram Pressure Stripped Tails
Alex Sheardown, Thomas M. Fish, Elke Roediger +11
We show that there is a new class of gas tails - slingshot tails - which form as a subhalo (i.e. a subcluster or early-type cluster galaxy) moves away from the cluster center towar…
Constraining star formation in M87 using deep HST UV data
Prathamesh Tamhane, William Waldron, Ming Sun +11
We analyzed the deepest Hubble Space Telescope (HST) F275W ultraviolet (UV) imaging of M87 to obtain the most robust constraints on its star formation rate (SFR) and star formation…
The velocity structure of the intracluster medium during a major merger: simulated microcalorimeter observations
Veronica Biffi, John A. ZuHone, Tony Mroczkowski +2
Major mergers between galaxy clusters can produce large turbulent and bulk flow velocities in the intra-cluster medium and thus imprint diagnostic features in X-ray spectral emissi…
AGN Fueling and Radio Jet Evolution in the Galaxy Group NGC 5044 revealed by VLBA HI Absorption and Proper-Motion Radio Observations
Francesco Ubertosi, Ewan O'Sullivan, Gerrit Schellenberger +8
The role of cooling gas in triggering active galactic nucleus (AGN) feedback in the centers of galaxy groups and clusters remains a key open question. NGC 5044, the X-ray brightest…
A new feedback cycle in the archetypal cooling flow group NGC 5044
Gerrit Schellenberger, Laurence P. David, Jan Vrtilek +5
The fate of cooling gas in the centers of galaxy clusters and groups is still not well understood, as is also the case for the complex process of triggering active galactic nucleus…
Are Luminous cD Haloes Formed by the Disruption of Dwarf Galaxies?
Omar Lopez-Cruz, H. K. C. Yee, James P. Brown +2
From a total sample of 45 Abell clusters observed by the Einstein X-ray observatory, we present the results on the galaxy luminosity function (LF) for a group of seven clusters tha…
The BIG X-ray tail
Chong Ge, Ming Sun, Masafumi Yagi +9
Galaxy clusters grow primarily through the continuous accretion of group-scale haloes. Group galaxies experience preprocessing during their journey into clusters. A star-bursting c…
Revisiting the Group-Dominant Elliptical NGC 5044 in the Radio Band: Continuum Emission and Detection of HI Absorption
Kamlesh Rajpurohit, Tirna Deb, Konstantinos Kolokythas +9
We present new MeerKAT L-band (continuum and HI) and upgraded Giant Metrewave Radio Telescope (300-850 MHz) observations of the archetypal cool-core group-dominant early-type galax…
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…
X-Ray Constraints on the Hot Gaseous Corona of Edge-on Late-type Galaxies in Virgo
Meicun Hou, Lin He, Zhensong Hu +6
We present a systematic study of the putative hot gas corona around late-type galaxies (LTGs) residing in the Virgo cluster, based on archival Chandra observations. Our sample cons…
The merging cluster Abell 85 caught between meals by XMM-Newton
Florence Durret, Gastao B. Lima Neto, William Forman
Our XMM-Newton observations of Abell 85 confirm the extended 4 Mpc filament first detected with ROSAT, which has an X-ray temperature of about 2 keV and is probably made of groups…
The 160 Square Degree ROSAT Survey - Revised Catalog & Cluster Evolution
Christopher Mullis, Brian McNamara, Hernan Quintana +6
We have constructed a large, statistically complete sample of galaxy clusters serendipitously detected as extended X-ray sources in 647 ROSAT PSPC pointed observations. The survey…
Unveiling the Cosmic Chemistry: Revisiting the Mass-Metallicity Relation with JWST/NIRSpec at 4 < z < 10
Arnab Sarkar, Priyanka Chakraborty, Mark Vogelsberger +12
We present star formation rates (SFR), the mass-metallicity relation (MZR), and the SFR-dependent MZR across redshifts 4 to 10 using 81 star-forming galaxies observed by the JWST N…
Chandra Observations of the X-ray Point Source Population in NGC 4636
Jennifer Posson-Brown, Somak Raychaudhury, William Forman +2
We present the X-ray point source population in the nearby Virgo elliptical galaxy NGC 4636 from 3 Chandra/ACIS observations, totaling 193 ks, taken over 3 years. Using wavelet dec…
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…
Brightest Cluster Galaxies: the centre can(not?) hold
Roberto De Propris, Michael J. West, Felipe Andrade-Santos +9
We explore the persistence of the alignment of brightest cluster galaxies (BCGs) with their local environment. We find that a significant fraction of BCGs do not coincide with the…
Atacama Compact Array Measurements of the Molecular Mass in the NGC 5044 Cooling Flow Group
Gerrit Schellenberger, Laurence P. David, Jan Vrtilek +13
The fate of cooling gas in the centers of galaxy clusters and groups is still not well understood, as is also the case for the complex processes of triggering star formation in cen…
Merger-driven multi-scale ICM density perturbations: testing cosmological simulations and constraining plasma physics
Annie Heinrich, Irina Zhuravleva, Congyao Zhang +3
The hot intracluster medium (ICM) provides a unique laboratory to test multi-scale physics in numerical simulations and probe plasma physics. Utilizing archival Chandra observation…
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…
Jet reorientation in central galaxies of clusters and groups: insights from VLBA and Chandra data
Francesco Ubertosi, Gerrit Schellenberger, Ewan O'Sullivan +8
Recent observations of galaxy clusters and groups with misalignments between their central AGN jets and X-ray cavities, or with multiple misaligned cavities, have raised concerns a…
The Presence of Thermally Unstable X-ray Filaments and the Production of Cold Gas in the NGC 5044 Group
Laurence P. David, Jan Vrtilek, Ewan O'Sullivan +3
We present the results of a deep Chandra observation of the X-ray bright, moderate cooling flow group NGC 5044 along with the observed correlations between the ionized, atomic, and…
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…
The first astrophysical result of HISAKI: a search for the EUV He I lines a massive cool core cluster at z=0.7
Yuanyuan Su, Tomoki Kimura, Ralph Kraft +6
Molecular cold gas and star formation have been observed at centers of cool-core clusters, albeit at a level much smaller than expected from the classic cooling model. Feedback fro…
AGN Driven Weather and Multiphase Gas in the Core of the NGC 5044 Galaxy Group
Laurence P. David, Ewan O'Sullivan, Christine Jones +7
A deep Chandra observation of the X-ray bright group, NGC 5044, shows that the central region of this group has been strongly perturbed by repeated AGN outbursts. These recent AGN…
A merger shock in Abell 1367
Chong Ge, Ming Sun, Ruo-Yu Liu +10
Multi-wavelength observations show that Abell 1367 (A1367) is a dynamically young cluster, with at least two subclusters merging along the SE-NW direction. With the wide-field XMM-…
Chandra view of Abell 407: the central compact group of galaxies and the interaction between the radio AGN and the ICM
Chao Geng, Chong Ge, Dharam V. Lal +8
Abell 407 (A407) is a unique galaxy cluster hosting a central compact group of nine galaxies (named as 'Zwicky's Nonet'; G1 - G9 in this work) within a 30 kpc radius region. The cl…
LEM All-Sky Survey: Soft X-ray Sky at Microcalorimeter Resolution
Ildar Khabibullin, Massimiliano Galeazzi, Akos Bogdan +23
The Line Emission Mapper (LEM) is an X-ray Probe with with spectral resolution ~2 eV FWHM from 0.2 to 2.5 keV and effective area >2,500 cm at 1 keV, covering a 33 arcmin diamet…
Sloshing Gas in the Core of the Most Luminous Galaxy Cluster RXJ1347.5-1145
Ryan E. Johnson, John A. ZuHone, Christine Jones +2
We present new constraints on the merger history of the most X-ray luminous cluster of galaxies, RXJ1347.5-1145, based its unique multiwavelength morphology. Our X-ray analysis con…
AGN Feedback in Galaxy Group 3C 88: Cavities, Shock and Jet Reorientation
Wenhao Liu, Ming Sun, Paul Nulsen +7
We present results from the deep Chandra observation (105 ksec), together with new Giant Metrewave Radio Telescope and Very Large Array data of the AGN outburst in the radio-loud g…
PSZ2 G181.06+48.47 III: weak-lensing analysis and merging scenario reconstruction of a low-mass cluster with exceptionally-distant radio relics
Eunmo Ahn, Hyejeon Cho, M. James Jee +7
The galaxy cluster PSZ2 G181.06+48.47 () is a post-merging system that exhibits symmetric double radio relics separated by ~2.7 Mpc. We present the first weak-lensing anal…
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…
Discovery of a double radio relic in ZwCl1447.2+2619: A rare testbed for shock acceleration models with a peculiar surface brightness ratio
Wonki Lee, M. James Jee, Kyle Finner +7
We report a discovery of a double radio relic in the cluster merger ZwCl1447.2+2619 () with uGMRT observations at and . The linear sizes of the no…
Weak-Lensing Analysis of the Complex Cluster Merger Abell 746 with Subaru/Hyper Suprime-Cam
Kim HyeongHan, Hyejeon Cho, M. James Jee +15
The galaxy cluster Abell 746 (A746; =0.214), featuring a double radio relic system, two isolated radio relics, a possible radio halo, disturbed V-shaped X-ray emission, and intr…
High-Energy Photon and Particle Effects onExoplanet Atmospheres and Habitability
Jeremy J. Drake, Julián D. Alvarado-Gómez, Vladimir Airapetian +41
It is now recognized that energetic stellar photon and particle radiation evaporates and erodes planetary atmospheres and controls upper atmospheric chemistry. Key exoplanet host s…
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…
SZ-X-ray Surface Brightness Fluctuations in the SPT-XMM clusters
Charles Romero, Massimo Gaspari, Gerrit Schellenberger +10
The hot plasma in galaxy clusters, the intracluster medium (ICM), is expected to be shaped by subsonic turbulent motions, which are key for heating, cooling, and transport mechanis…
Decoding AGN Feedback with X-arithmetic: From Morphology to Physical Mechanisms
Hannah McCall, Irina Zhuravleva, Eugene Churazov +4
Feedback from Active Galactic Nuclei (AGN) is a key process in the evolution of massive halos in the Universe. New observational information on feedback is crucial for improving th…
The Diffuse Emission and a Variable ULX in the Elliptical Galaxy NGC 3379
Laurence P. David, Christine Jones, William Forman +1
A Chandra observation of the intermediate luminosity (M_B=-20) elliptical galaxy NGC 3379 resolves 75% of the X-ray emission within the central 5kpc into point sources. Spectral an…
X-ray polarization evidence for a 200 years-old flare of Sgr A
Frédéric Marin, Eugene Churazov, Ildar Khabibullin +101
The center of the Milky Way Galaxy hosts a 4 million solar mass black hole (Sgr A) that is currently very quiescent with a luminosity many orders of magnitude below those…
Probing the high frequency variability of NGC 5044: the key to AGN feedback
Gerrit Schellenberger, Ewan O'Sullivan, Laurence David +10
The active galactic nucleus (AGN) feeding and feedback process in the centers of galaxy clusters and groups is still not well understood. NGC 5044 is the ideal system in which to s…
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…
The galaxy cluster outskirts probed by Chandra
Andrea Morandi, Ming Sun, William Forman +1
We studied the physical properties of the intracluster medium in the virialization region of a sample of 320 clusters (, keV) in the Chandra archive. With th…
The Universal Gas Mass Fraction in Clusters of Galaxies
Laurence P. David, Christine Jones, William Forman
We obtained a deep 150ksec Chandra observation of the optically selected cluster of galaxies, RCS 2318+0034, to investigate the gas mass fraction in this system. Combining our deep…
Mapping the Nearest Ancient Sloshing Cold Front in the Sky with XMM-Newton
Sheng-Chieh Lin, Yuanyuan Su, Iraj Vaezzadeh +8
The Virgo Cluster is the nearest cool core cluster that features two well-studied sloshing cold fronts at radii of kpc and kpc, respectively. In this…
Polarization of reflected X-ray emission from the Sgr A molecular complex: multiple flares, multiple sources?
Ildar Khabibullin, Eugene Churazov, Riccardo Ferrazzoli +100
The extended X-ray emission observed in the direction of several molecular clouds in the central molecular zone of our Galaxy exhibits spectral and temporal properties consistent w…
An Einstein X-ray Survey of Optically-Selected Galaxies: I. Data
David Burstein, Christine Jones, William Forman +2
We present the results of a complete Einstein Imaging Proportional Counter (IPC) X-ray survey of optically-selected galaxies from Shapley-Ames Catalog, Uppsala General Catalog and…
Substructure: Clues to the Formation of Clusters of Galaxies
Michael J. West, Christine Jones, William Forman
We have examined the spatial distribution of substructure in clusters of galaxies using Einstein X-ray observations. Subclusters are found to have a markedly anisotropic distributi…
X-ray scaling relations from a complete sample of the richest maxBCG clusters
Chong Ge, Ming Sun, Eduardo Rozo +5
We use a complete sample of 38 richest maxBCG clusters to study the ICM-galaxy scaling relations and the halo mass selection properties of the maxBCG algorithm, based on X-ray and…
Resilience of Sloshing Cold Fronts against Subsequent Minor Mergers
Iraj Vaezzadeh, Elke Roediger, Claire Cashmore +8
Minor mergers are common in galaxy clusters. They have the potential to create sloshing cold fronts (SCFs) in the intracluster medium (ICM) of the cluster. However, the resilience…
A Deep Chandra Observation of the Distant Galaxy Cluster MS1137.5+6625
Laura Grego, Jan Vrtilek, Leon Van Speybroeck +5
We present results from a deep Chandra observation of MS1137.5+66, a distant (z=0.783) and massive cluster of galaxies. Only a few similarly massive clusters are currently known at…
Inferences from surface brightness fluctuations of Zwicky 3146 via the Sunyaev-Zeldovich effect and X-ray observations
Charles E. Romero, Massimo Gaspari, Gerrit Schellenberger +16
The galaxy cluster Zwicky 3146 is a sloshing cool core cluster at that in SZ imaging does not appear to exhibit significant pressure substructure in the intracluster me…
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-…
Circumgalactic Medium on the Largest Scales: Detecting X-ray Absorption Lines with Large-Area Microcalorimeters
Akos Bogdan, Ildar Khabibullin, Orsolya Kovacs +22
The circumgalactic medium (CGM) plays a crucial role in galaxy evolution as it fuels star formation, retains metals ejected from the galaxies, and hosts gas flows in and out of gal…
Molecular Gas in the X-ray Bright Group NGC 5044 as Revealed by ALMA
Laurence P. David, Jeremy Lim, William Forman +17
A short 30 minute ALMA observation of the early-type galaxy NGC 5044, which resides at the center of an X-ray bright group with a moderate cooling flow, has detected 24 molecular s…
Kinematics of Weak Cool-Core Cluster A3571 Observed with XRISM: Low Cooling Rate Balanced by Low Heating Rate
Hannah McCall, Irina Zhuravleva, Kyoko Matsushita +10
Most XRISM galaxy cluster observations to date have focused on AGN feedback or actively merging systems. The weak cool-core cluster A3571 was observed in four XRISM Cycle 1 pointin…
Unveiling the Cosmic Chemistry II: "Direct" -based metallicity of galaxies at 3 10 with JWST/NIRSpec
Priyanka Chakraborty, Arnab Sarkar, Randall Smith +10
We report the detection of the [O III] auroral line in 42 galaxies within the redshift range of . These galaxies were selected from publicly available JWST data release…
Intracluster Globular Clusters
Michael J. West, Patrick Cote, Christine Jones +2
Globular cluster populations of supergiant elliptical galaxies are known to vary widely, from extremely populous systems like that of UGC 9799, the centrally dominant galaxy in Abe…
Pulsar-wind-nebula-powered Galactic center X-ray filament G0.13-0.11: Proof of the synchrotron nature by IXPE
Eugene Churazov, Ildar Khabibullin, Thibault Barnouin +103
We report the discovery of X-ray polarization from the X-ray-bright filament. G0.13-0.11 in the Galactic center (GC) region. This filament features a bright, hard X-ray source that…
Role of Electon Excitation and Nature of Molecular Gas in Cluster Central Elliptical Galaxies
Jeremy Lim, Dinh-V-Trung, Jan Vrtilek +2
We present observations in CO(3-2) that, combined with previous observations in CO(2-1), constrain the physical properties of the filamentary molecular gas in the central 6.5…
Evidence for heavy seed origin of early supermassive black holes from a z~10 X-ray quasar
Akos Bogdan, Andy Goulding, Priyamvada Natarajan +9
Observations of quasars reveal that many supermassive black holes (BHs) were in place less than 700 million years after the Big Bang. However, the origin of the first BHs remains a…
ROSAT PSPC Observations of the Richest () ACO Clusters
Laurence P. David, William Forman, Christine Jones
We have compiled an X-ray catalog of optically selected rich clusters of galaxies observed by the PSPC during the pointed GO phase of the ROSAT mission. This paper contains a syste…
Groups of Galaxies at Intermediate Redshift
Eric D. Miller, Marshall Bautz, Catherine Grant +6
Galaxy groups are key tracers of galaxy evolution, cluster evolution, and structure formation, yet they are difficult to study at even moderate redshift. We have undertaken a proje…
Testing galaxy feedback models with the first resolved profiles of the circumgalactic medium
Urmila Chadayammuri, Akos Bogdan, Benjamin Oppenheimer +3
The hot ( K) phase of the circumgalactic medium (CGM) contains a large fraction of baryons in galaxies. It also retains signatures of the processes that shaped the galaxies,…
Radio Mode Outbursts in Giant Elliptical Galaxies
Paul Nulsen, Christine Jones, William Forman +4
Outbursts from active galactic nuclei (AGN) affect the hot atmospheres of isolated giant elliptical galaxies (gE's), as well as those in groups and clusters of galaxies. Chandra ob…
The Hot Gas Content of Low-Luminosity Early-Type Galaxies and the Implications Regarding Supernova Heating and AGN Feedback
Laurence P. David, Christine Jones, William Forman +2
We have analyzed Chandra observations of 18 low-luminosity early-type galaxies with L_B < 3 x 10e10 Lo. Thermal emission from hot gas with temperatures between 0.2 and 0.8 keV comp…
Intracluster magnetic filaments and an encounter with a radio jet
Lawrence Rudnick, Marcus Bruggen, Gianfranco Brunetti +6
Thin synchrotron-emitting filaments are increasingly seen in the intracluster medium (ICM). We present the first example of a direct interaction between a magnetic filament, a radi…