A5015924085- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Spectroscopy and Laser Applications
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Cosmology and Gravitation Theories
- GNSS positioning and interference
- Blind Source Separation Techniques
- Historical Geography and Cartography
- Advanced Frequency and Time Standards
- Computational Physics and Python Applications
- Astronomical Observations and Instrumentation
- Precipitation Measurement and Analysis
- Gas Dynamics and Kinetic Theory
- Radioactive Decay and Measurement Techniques
- Maritime and Coastal Archaeology
- Marine and environmental studies
- Historical Influence and Diplomacy
- Black Holes and Theoretical Physics
University of Manitoba
2019-2024
University of Waterloo
2013-2019
TRIUMF
2016
We examine unresolved nuclear X-ray sources in 57 brightest cluster galaxies to study the relationship between emission and accretion onto supermassive black holes (SMBHs). The majority of clusters our sample have prominent cavities embedded surrounding hot atmospheres, which we use estimate mean jet power average rate SMBHs over past several hundred Myr. find that ~50% detectable emission. luminosity is correlated with determined using cavities, consistent hypothesis traces ongoing...
We report ALMA Early Science observations of the Abell 1835 brightest cluster galaxy (BCG) in CO (3-2) and (1-0) emission lines. detect 5E10 solar masses molecular gas within 10 kpc BCG. Its velocity width ~130 km/s FWHM is too narrow to be supported by dynamical pressure. The may instead a rotating, turbulent disk oriented nearly face-on. forming stars at rate 100-180 per year. Roughly 1E10 projected 3-10 north-west east nucleus with line sight velocities lying between -250 +480 respect...
Abstract We present Atacama Large Millimeter/submillimeter Array and Multi-Unit Spectroscopic Explorer observations of the brightest cluster galaxy in Abell 2597, a nearby ( z = 0.0821) cool core galaxies. The data map kinematics three billion solar mass filamentary nebula that spans innermost 30 kpc galaxy’s core. Its warm ionized cold molecular components are both cospatial comoving, consistent with hypothesis optical traces envelopes many clouds drift velocity field hot X-ray atmosphere....
Abstract We present an analysis of new and archival ALMA observations molecular gas in 12 central cluster galaxies. examine emerging trends filament morphology velocities to understand their origins. Molecular masses these systems span $10^9 {--}10^{11} {\rm \, M_{\odot }}$, far more than most gas-rich images reveal a distribution morphologies from filamentary disc-dominated structures. Circumnuclear discs on kiloparsec scales appear rare. In systems, half nearly all the lies structures with...
We present accurate mass and thermodynamic profiles for a sample of 56 galaxy clusters observed with the Chandra X-ray Observatory. investigate effects local gravitational acceleration in central cluster galaxies, we explore role free-fall time (t$_{\rm ff}$) thermally unstable cooling. find that cooling cool}$) is as effective an indicator cold gas, traced through its nebular emission, ratio t$_{\rm cool}$/t$_{\rm ff}$. Therefore, cool}$ alone apparently governs onset hot atmospheres. The...
We present ALMA observations of the CO(1–0) and CO(3–2) line emission tracing filaments cold molecular gas in central galaxy cluster PKS 0745−191. The total mass |$4.6\pm 0.3\times 10^{9} {\rm \, M_{{\odot}}}$|, assuming a Galactic XCO factor, is divided roughly equally between three each extending radially 3-5 kpc from centre. peak located SE filament ∼ 1 arcsec (2 kpc) nucleus. velocities clouds are low, lying within |$\pm 100 km \rm s^{-1}}$| galaxy's systemic velocity. Their full width...
We report ALMA Early Science CO(1-0) and CO(3-2) observations of the brightest cluster galaxy (BCG) in Abell 1664. The BCG contains 1.1x10^{10} solar masses molecular gas divided roughly equally between two distinct velocity systems: one from -250 to +250 km/s centred on BCG's systemic a high system blueshifted by 570 with respect velocity. component shows smooth gradient across center proportional radius suggestive solid body rotation about nucleus. However, mass structure are highly...
We present an analysis of deep Chandra X-ray observations the galaxy cluster MS 0735.6+7421, which hosts most energetic radio AGN known. Our has revealed two cavities in its hot atmosphere with diameters 200-240 kpc. The total cavity enthalpy, mean age, and jet power are $9\times 10^{61}$ erg, $1.6\times 10^{8}$ yr, $1.7\times 10^{46}$ erg/s, respectively. surrounded by nearly continuous temperature surface brightness discontinuities associated elliptical shock front Mach number 1.26...
Abstract We present atmospheric gas entropy profiles for 40 early-type galaxies and 110 clusters spanning several decades of halo mass, radio jet power, galaxy type. show that within ∼0.1 R 2500 the low-mass systems, including ellipticals, brightest cluster galaxies, spiral scale approximately as K ∝ 2/3 . Beyond are slightly shallower than 1.1 profile expected from gravitational collapse alone, indicating heating by active galactic nuclei (AGN) feedback extends well beyond central galaxy....
Abstract To advance our understanding of the fuelling and feedback processes which power Universe’s most massive black holes, we require a significant increase in knowledge molecular gas exists their immediate surroundings. However, behaviour this is poorly understood due to difficulties associated with observing it directly. We report on survey 18 brightest cluster galaxies lying cool cores, from detect core regions eight via carbon monoxide (CO), cyanide (CN) silicon (SiO) absorption...
We present new ALMA observations tracing the morphology and velocity structure of molecular gas in central galaxy cluster Abell 1795. The lies two filaments that extend 5 - 7 kpc to N S from nucleus project exclusively around outer edges inner radio bubbles. Radio jets launched by AGN have inflated bubbles filled with relativistic plasma into hot atmosphere surrounding galaxy. filament has a smoothly increasing gradient along its length galaxy's systemic at -370 km/s, average galaxies,...
ABSTRACT We present ALMA CO(1–0) and CO(3–2) observations of the brightest cluster galaxy (BCG) in 2A 0335+096 ( z = 0.0346). The total molecular gas mass 1.13 ± 0.15 × 10 9 M ⊙ is divided into two components: a nuclear region 7 kpc long dusty filament. central component accounts for 3.2 0.4 8 supply cold gas. Instead forming rotationally supported ring or disk, it composed distinct, blueshifted clumps south nucleus series low-significance redshifted extending toward nearby companion galaxy....
Abstract We announce here the public availability of a catalog ν ∼ 3 GHz Quick Look observations from first epoch Very Large Array Sky Survey. The consists three distinct and linkable tables, namely (a) detected radio components, (b) host identifications with total source properties for single-component, close double/triple sources (angular separations <10″), (c) image metadata. Given images are limited in quality, we include data reliability flagging to improve scientific usability this...
Abstract We present an analysis of 55 central galaxies in clusters and groups with molecular gas masses star formation rates lying between <?CDATA ${10}^{8}\,\mathrm{and}\,{10}^{11}\ {M}_{\odot }$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msup> <mml:mrow> <mml:mn>10</mml:mn> </mml:mrow> <mml:mn>8</mml:mn> </mml:msup> <mml:mspace width="0.50em" /> <mml:mi>and</mml:mi> <mml:mn>11</mml:mn> width="0.33em" <mml:msub> <mml:mi>M</mml:mi> <mml:mo>⊙</mml:mo>...
We derive X-ray mass, luminosity, and temperature profiles for 45 galaxy clusters to explore relationships between halo AGN feedback, central cooling time. find that radio--mechanical feedback power (referred here as "AGN power") in cluster galaxies correlates with mass P$_{\rm mech}$ $\propto$ M$^{1.55\pm0.26}$, but only halos atmospheric times shorter than 1 Gyr. The trend of is consistent the scaling expected from a self-regulating loop, well black hole co-evolution along $M_{\rm BH} - σ$...
Multi-phase filamentary structures around Brightest Cluster Galaxies are likely a key step of AGN-feedback. We observed molecular gas in 3 cool cluster cores: Centaurus, Abell S1101, and RXJ1539.5 gathered ALMA MUSE data for 12 other clusters. Those observations show clumpy, massive long, 3--25 kpc, filaments, preferentially located the radio bubbles inflated by AGN (Active Galactic Nucleus). Two objects nuclear disks. The optical nebula is certainly tracing warm envelopes cold filaments....
Active galactic nuclei play a crucial role in the accretion and ejection of gas galaxies. Although their outflows are well studied, finding direct evidence has proved very difficult so far been done for few sources. A promising way to study significance cold is by observing absorption an active nucleus's extremely bright radio emission lying along line-of-sight. As such, we present ALMA CO(1-0) CO(2-1) observations Hydra-A brightest cluster galaxy (z=0.054) which reveal existence cold,...
Abstract Many processes within galaxy clusters, such as those believed to govern the onset of thermally unstable cooling and active galactic nucleus feedback, are dependent upon local dynamical timescales. However, accurate mapping mass distribution individual clusters is challenging, particularly toward cluster centers where total budget has substantial radially contributions from stellar ( M * ), gas dark matter DM ) components. In this paper we use a small sample with deep Chandra...
MS 0735.6+7421 is a galaxy cluster which hosts central radio with very steep spectrum, produced by one of the most powerful known jetted active galactic nuclei (AGN). The plasma, ejected at nearly light speed from AGN, have displaced intra-cluster medium, leaving two pairs cavities observable in X-ray, associated to different outbursts, and distributed energy surrounding medium. In this work we performed for first time detailed, high-resolution spectral study source frequencies investigated...
Abstract Active galactic nuclei (AGNs) can often be identified in radio images as two lobes, sometimes connected to a core by jet. This multicomponent morphology unfortunately creates difficulties for source finders, leading components that are (a) separate parts of wider whole, and (b) offset from the multiwavelength cross identification host galaxy. In this work we define an algorithm, DRAGN hunter , identifying double sources associated with AGNs (DRAGNs) component catalog data first...
Abstract We present ALMA Cycle 4 observations of CO(1-0), CO(3-2), and 13 CO(3-2) line emission in the brightest cluster galaxy (BCG) RXJ0821+0752. This is one first detections CO a cluster. Half originates from two clumps molecular gas that are spatially offset galactic center. These surrounded by diffuse extends 8 kpc length. The detected confined entirely to bright clumps, with any outside this region lying below our detection threshold. Two distinct velocity components similar integrated...
Abstract X-ray luminosity, temperature, gas mass, total and their scaling relations are derived for 94 early-type galaxies (ETGs) using archival Chandra Observatory observations. Consistent with earlier studies, the relations, L X ∝ T 4.5±0.2 , M 2.4±0.2 2.8±0.3 significantly steeper than expected from self-similarity. This steepening indicates that atmospheres heated above level gravitational infall alone. Energetic feedback nuclear black holes supernova explosions likely heating agents....
Abstract We present recent ALMA observations of the CO (1–0) and (3–2) emission lines in brightest cluster galaxy RXC J1504.1−0248, which is one most extreme cool core clusters known. The central contains <?CDATA $1.9\times {10}^{10}\,{M}_{\odot }$?> molecular gas. gas morphology complex disturbed, showing no evidence for a rotationally supported structure equilibrium. A total 80% situated within 5 kpc galactic center, while remaining located 20 long filament. cold has likely condensed out...
Modern wide field radio surveys typically detect millions of objects. Manual determination the morphologies is impractical for such a large number sources. Techniques based on machine learning are proving to be useful classifying numbers The self-organizing map (SOM) an unsupervised algorithm that projects many-dimensional dataset onto two- or three-dimensional lattice neurons. This dimensionality reduction allows user visualize common features data better and develop algorithms objects not...