All Outputs (17)

A cooling flow around the low-redshift quasar H1821+643 (2024)
Journal Article

H1821+643 is the nearest quasar hosted by a galaxy cluster. The energy output by the quasar, in the form of intense radiation and radio jets, is captured by the surrounding hot atmosphere. Here, we present a new deep Chandra observation of H1821+643... Read More about A cooling flow around the low-redshift quasar H1821+643.

A massive multiphase plume of gas in Abell 2390's brightest cluster galaxy (2024)
Journal Article

We present new ALMA CO(2-1) observations tracing 2.2 × 10 10 M ⊙ of molecular gas in Abell 2390's brightest cluster galaxy, where half the gas is located in a one-sided plume extending 15 kpc out from the galaxy centre. This molecular gas has a smoot... Read More about A massive multiphase plume of gas in Abell 2390's brightest cluster galaxy.

Constraints on thermal conductivity in the merging cluster Abell 2146 (2023)
Journal Article

The cluster of galaxies Abell 2146 is undergoing a major merger and is an ideal cluster to study ICM physics, as it has a simple geometry with the merger axis in the plane of the sky, its distance allows us to resolve features across the relevant sca... Read More about Constraints on thermal conductivity in the merging cluster Abell 2146.

AGN feeding and feedback in M84: from kiloparsec scales to the Bondi radius (2023)
Journal Article

We present the deepest Chandra observation to date of the galaxy M84 in the Virgo Cluster, with over 840 ks of data provided by legacy observations and a recent 730 ks campaign. The increased signal-to-noise ratio allows us to study the origins of th... Read More about AGN feeding and feedback in M84: from kiloparsec scales to the Bondi radius.

Testing the Limits of AGN Feedback and the Onset of Thermal Instability in the Most Rapidly Star-forming Brightest Cluster Galaxies (2022)
Journal Article

We present new, deep, narrow- and broadband Hubble Space Telescope observations of seven of the most star-forming brightest cluster galaxies (BCGs). Continuum-subtracted [OII] maps reveal the detailed, complex structure of warm (T ∼ 104 K) ionized ga... Read More about Testing the Limits of AGN Feedback and the Onset of Thermal Instability in the Most Rapidly Star-forming Brightest Cluster Galaxies.

The structure of cluster merger shocks: turbulent width and the electron heating time-scale (2022)
Journal Article

We present a new 2 Ms Chandra observation of the cluster merger Abell 2146, which hosts two huge M∼2 shock fronts each ∼500 kpc across. For the first time, we resolve and measure the width of cluster merger shocks. The best-fit width for the bow shoc... Read More about The structure of cluster merger shocks: turbulent width and the electron heating time-scale.

Turbulent magnetic fields in merging clusters: a case study of Abell 2146 (2022)
Journal Article

Kelvin-Helmholtz instabilities (KHI) along contact discontinuities in galaxy clusters have been used to constrain the strength of magnetic fields in galaxy clusters, following the assumption that, as magnetic field lines drape around the interface be... Read More about Turbulent magnetic fields in merging clusters: a case study of Abell 2146.

New constraints on light axion-like particles using Chandra transmission grating spectroscopy of the powerful cluster-hosted quasar H1821+643 (2021)
Journal Article

Axion-like particles (ALPs) are predicted by several Beyond the Standard Model theories, in particular, string theory. In the presence of an external magnetic field perpendicular to the direction of propagation, ALPs can couple to photons. Therefore,... Read More about New constraints on light axion-like particles using Chandra transmission grating spectroscopy of the powerful cluster-hosted quasar H1821+643.

Astrophysical Limits on Very Light Axion-like Particles from Chandra Grating Spectroscopy of NGC 1275 (2020)
Journal Article

Axions/axion-like particles (ALPs) are a well-motivated extension of the Standard Model and are generic within String Theory. The X-ray transparency of the intracluster medium (ICM) in galaxy clusters is a powerful probe of light ALPs (with mass < 10... Read More about Astrophysical Limits on Very Light Axion-like Particles from Chandra Grating Spectroscopy of NGC 1275.

Driving massive molecular gas flows in central cluster galaxies with AGN feedback (2019)
Journal Article

We present an analysis of new and archival ALMA observations of molecular gas in twelve central cluster galaxies. We examine emerging trends in molecular filament morphology and gas velocities to understand their origins. Molecular gas masses in thes... Read More about Driving massive molecular gas flows in central cluster galaxies with AGN feedback.

Star formation inside a galactic outflow (2017)
Journal Article

© 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Recent observations have revealed massive galactic molecular outflows that may have the physical conditions (high gas densities) required to form stars. Indeed, severa... Read More about Star formation inside a galactic outflow.

Hitomi Constraints on the 3.5 keV Line in the Perseus Galaxy Cluster (2017)
Journal Article

© 2017. The American Astronomical Society. All rights reserved. High-resolution X-ray spectroscopy with Hitomi was expected to resolve the origin of the faint unidentified E ≈ 3.5 keV emission line reported in several low-resolution studies of variou... Read More about Hitomi Constraints on the 3.5 keV Line in the Perseus Galaxy Cluster.

The quiescent intracluster medium in the core of the Perseus cluster (2016)
Journal Article

Clusters of galaxies are the most massive gravitationally bound objects in the Universe and are still forming. They are thus important probes1 of cosmological parameters and many astrophysical processes. However, knowledge of the dynamics of the perv... Read More about The quiescent intracluster medium in the core of the Perseus cluster.

Cold, clumpy accretion onto an active supermassive black hole (2016)
Journal Article

Supermassive black holes in galaxy centres can grow by the accretion of gas, liberating energy that might regulate star formation on galaxy-wide scales. The nature of the gaseous fuel reservoirs that power black hole growth is nevertheless largely un... Read More about Cold, clumpy accretion onto an active supermassive black hole.

Inside the Bondi radius of M87 (2015)
Journal Article

A 10^{10} solar mass flow of molecular gas in the A1835 brightest cluster galaxy (2014)
Journal Article

Massive molecular gas flows in the A1664 brightest cluster galaxy (2014)
Journal Article