A5056563488- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Radio Astronomy Observations and Technology
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Cosmology and Gravitation Theories
- Gas Dynamics and Kinetic Theory
- Advanced Control Systems Optimization
- Historical Influence and Diplomacy
- Astronomical Observations and Instrumentation
- Historical Geography and Cartography
- Adaptive optics and wavefront sensing
Center for Astrophysics Harvard & Smithsonian
2024-2025
Massachusetts Institute of Technology
2019-2024
Kavli Institute for Particle Astrophysics and Cosmology
2021
University High School
2021
Moscow Institute of Thermal Technology
2020
University of Cambridge
2019
We present a catalog of 689 galaxy cluster candidates detected at significance $\xi>4$ via their thermal Sunyaev-Zel'dovich (SZ) effect signature in 95 and 150 GHz data from the 500-square-degree SPTpol survey. use optical infrared Dark Energy Camera Wide-field Infrared Survey Explorer (WISE) Spitzer satellites, to confirm 544 these as clusters with $\sim94\%$ purity. The sample has an approximately redshift-independent mass threshold redshift $z>0.25$ spans $1.5 \times 10^{14} < M_{500c} 9...
ABSTRACT We search for the signature of cosmological shocks in stacked gas pressure profiles galaxy clusters using data from South Pole Telescope (SPT). Specifically, we stack latest Compton-y maps 2500 deg2 SPT-SZ survey on locations identified that same set. The sample contains 516 with mean mass $\langle M_{\rm 200m}\rangle = 10^{14.9} \, {\rm M}_\odot$ and redshift 〈z〉 0.55. analyse parallel a set zoom-in hydrodynamical simulations three hundred project. show two features: (i) deficit at...
The thermodynamic properties of the hot plasma in galaxy clusters retains information on processes leading to formation and evolution gas their deep, dark matter potential wells. These are dictated not only by gravity but also physics, e.g. AGN feedback turbulence. In this work, we study properties, density, temperature, pressure, entropy, most massive distant ($z > 1.2$) SPT-selected clusters, compare them with those nearby ($z<0.1$) constrain as a function time radius. We find that...
Abstract We provide the first combined cosmological analysis of South Pole Telescope (SPT) and Planck cluster catalogs. The aim is to an independent calibration for scaling relations, exploiting constraining power SPT-SZ catalog its dedicated weak lensing (WL) X-ray follow-up observations. build a new version likelihood. In ν Λ CDM scenario, focusing on mass slope bias we find <?CDATA ${\alpha }_{\mathrm{SZ}}={1.49}_{-0.10}^{+0.07}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
While the vast majority of Tidal Disruption Events (TDEs) has been identified by wide-field sky surveys in optical and X-ray bands, recent studies indicate that a considerable fraction TDEs may be dust obscured, thus preferentially detected infrared (IR) wavebands. In this Letter, we present discovery luminous mid-IR nuclear flare (termed WTP 14adbjsh) systematic transient search archival images from NEOWISE survey. The source reached peak luminosity $L \simeq 10^{43} \text{erg s}^{-1}$ at...
Using $\sim$427 ks of Chandra observations, we present a study shock heating and ICM cooling in the galaxy cluster RBS 797. We discover three nested pairs weak shocks at roughly 50 kpc, 80 kpc 130 from center. The total energy associated with is $\sim6\times10^{61}$ erg, central AGN driving pair every 20-30 Myr power $P_{sh}\approx10^{46}$ erg s$^{-1}$. Based on its morphology age ($\sim$30 Myr), inner cocoon four equidistant X-ray cavities previously discovered. From thermodynamic analysis...
We present integral field unit observations of the Phoenix Cluster with JWST Mid-infrared Instrument's Medium Resolution Spectrometer (MIRI/MRS). focus this study on molecular gas, dust, and star formation in brightest cluster galaxy (BCG). use precise spectral modeling to produce maps silicate polycyclic aromatic hydrocarbons (PAHs) inner $\sim$50 kpc cluster. have developed a novel method for measuring optical depth from silicates by comparing observed H$_2$ line ratios those predicted...
Abstract We present the first results of a deep Chandra observation galaxy cluster RBS 797 whose previous X-ray studies revealed two pronounced cavities in east–west (E–W) direction. Follow-up VLA radio observations central active galactic nucleus (AGN) uncovered different jet and lobe orientations, with lobes filling E–W perpendicular jets showing emission north–south (N–S) direction over same scale (≈30 kpc). With new ∼427 ks total exposure, we report detection additional, symmetric N–S at...
Abstract We present new, deep, narrow- and broadband Hubble Space Telescope observations of seven the most star-forming brightest cluster galaxies (BCGs). Continuum-subtracted [O II ] maps reveal detailed, complex structure warm ( T ∼ 10 4 K) ionized gas filaments in these BCGs, allowing us to measure spatially resolved star formation rates (SFRs) ∼60–600 M ⊙ yr −1 . compare SFRs systems others from literature their intracluster medium cooling <?CDATA ${\dot{M}}_{\mathrm{cool}}$?> <mml:math...
Abstract We present the results of a joint analysis Chandra X-ray and South Pole Telescope (SPT) Sunyaev–Zel’dovich (SZ) observations targeting first sample galaxy clusters at 0.3 < z 1.3, selected to be progenitors well-studied nearby based on their expected accretion rate. develop new procedure in order tackle challenge that is estimating intracluster medium (ICM) properties low-mass high-redshift with ∼150 counts. One dominant sources uncertainty ICM density profile estimated standard...
Using stellar population synthesis models to infer star formation histories (SFHs), we analyse photometry and spectroscopy of a large sample quiescent galaxies which are members Sunyaev-Zel'dovich (SZ)-selected galaxy clusters across wide range redshifts. We calculate masses mass-weighted ages for 837 cluster at 0.3 < z 1.4 using rest-frame optical spectra the Python-based Prospector framework, from 61 in SPT-GMOS Spectroscopic Survey (0.3 0.9) 3 SPT Hi-z (1.25 1.4). subpopulations divided...
Abstract We present a study of the relationship between black hole accretion rate (BHAR) and star formation (SFR) in sample giant elliptical galaxies. These galaxies, which live at centers galaxy groups clusters, have activity that is primarily fueled by gas condensing out hot intracluster medium. For 46 galaxies spanning five orders magnitude BHAR SFR, we find mean ratio <?CDATA ${\mathrm{log}}_{10}(\mathrm{BHAR}/\mathrm{SFR})=-1.45\pm 0.2$?> , independent methodology used to constrain both...
Abstract We present the results of an analysis Wide-field Infrared Survey Explorer (WISE) observations full 2500 deg 2 South Pole Telescope (SPT)-Sunyaev–Zel’dovich cluster sample. describe a process for identifying active galactic nuclei (AGN) in brightest galaxies (BCGs) based on WISE mid-IR color and redshift. Applying this technique to BCGs SPT-SZ sample, we calculate AGN-hosting BCG fraction, which is defined as fraction hosting bright central AGNs over all possible BCGs. Assuming...
Abstract We present the discovery of most distant, dynamically relaxed cool core cluster, SPT-CL J2215−3537 (SPT2215), and its central brightest cluster galaxy (BCG) at z = 1.16. Using new X-ray observations, we demonstrate that SPT2215 harbors a strong with cooling time 200 Myr (at 10 kpc) maximal intracluster medium rate 1900 ± 400 M ⊙ yr −1 . This prodigious may be responsible for fueling extended, star-forming filaments observed in Hubble Space Telescope imaging. Based on...
Abstract We present new, deep (245 ks) Chandra observations of the galaxy cluster Abell 1664 ( z = 0.1283). These images reveal rich structure, including elongation and accompanying compressions X-ray isophotes in NE–SW direction, suggesting that hot gas is sloshing gravitational potential. This has resulted cold fronts, at distances 50, 110, 325 kpc from center. Our results indicate core A1664 highly disturbed, as global metallicity cooling time flatten small radii, implying mixing on a...
ABSTRACT We present the analysis of deep X-ray observations 10 massive galaxy clusters at redshifts 1.05 &lt; z 1.71, with primary goal measuring metallicity intracluster medium (ICM) intermediate radii, to better constrain models metal enrichment intergalactic medium. The targets were selected from and Sunyaev–Zel’dovich effect surveys, observed both XMM–Newton Chandra satellites. For each cluster, a precise gas mass profile was extracted, which value r500 could be estimated. This...
Abstract We analyze the cooling and feedback properties of 48 galaxy clusters at redshifts 0.4 < z 1.3 selected from South Pole Telescope (SPT) catalogs to evolve like progenitors massive well-studied systems ∼ 0. estimate radio power brightest cluster (BCG) location each an analysis Australia Compact Array data. Assuming that scaling relation between active galactic nucleus (AGN) cavity P cav observed low redshift does not with redshift, we use these measurements in order expected AGN...
We present ~103 ks of Chandra observations the galaxy cluster SPT-CLJ0528-5300 (SPT0528, z=0.768). This harbors most radio-loud (L_1.4GHz = 1.01 x 10^33 erg/s/Hz) central AGN any in South Pole Telescope (SPT) SZ survey with available X-ray data. find evidence AGN-inflated cavities emission, which are consistent orientation jet direction revealed by ATCA radio The combined probability that two such depressions -- each at ~1.4-1.8sigma significance, oriented ~180 degrees apart and aligned axis...
Abstract We present a multiwavelength analysis of the galaxy cluster SPT-CL J0607-4448 (SPT0607), which is one most distant clusters discovered by South Pole Telescope at z = 1.4010 ± 0.0028. The high-redshift shows clear signs being relaxed with well-regulated feedback from active galactic nucleus (AGN) in brightest (BCG). Using Chandra X-ray data, we construct thermodynamic profiles and determine properties intracluster medium. cool-core nature supported centrally peaked density profile...
Abstract We present an analysis of the mass distribution inferred from strong lensing by SPT-CL J0356−5337, a cluster galaxies at redshift <?CDATA $z=1.0359$?> revealed in follow-up SPT-SZ clusters. The has Einstein radius ${\theta }_{{\rm{E}}}\simeq $?> 14″ for source z = 3 and within 500 kpc ${M}_{500\mathrm{kpc}}=4.0\pm 0.8\times {10}^{14}\,$?> ${M}_{\odot }$?> . Our spectroscopic identification three multiply imaged systems ( $z=2.363$?> , $z=2.364$?> $z=3.048$?> ), combined with...
Supermassive black holes and supernovae explosions at the centres of active galaxies power cycles outflowing inflowing gas that affect galactic evolution overall structure Universe. While simulations observations show this must be case, range physical scales (over ten orders magnitude) paucity available tracers, make both simulation observation these effects difficult. By serendipity, there lies an galaxy, Centaurus A (NGC 5128), such a close proximity as to allow its over entire across...
Abstract We present a probable host galaxy of the fast radio burst FRB 20190605C, detected by Canadian Hydrogen Intensity Mapping Experiment. The localization was enabled saved baseband data; region contained one with photometric redshift consistent dispersion measure FRB. This identified as most likely Probabilistic Association Transients to their Hosts probability calculation, finding association P ( O ∣ x ) = 0.913. With Prospector , we used joint spectro-photometric fit model stellar...
Abstract We present a multiwavelength study of the brightest cluster galaxies (BCGs) in sample 95 most massive galaxy clusters selected from South Pole Telescope Sunyaev–Zeldovich (SZ) survey. Our spans redshift range 0.3 < z 1.7, and is complete with optical spectroscopy various ground-based observatories, as well ground space-based imaging optical, X-ray, radio wave bands. At ∼ 0, previous studies have shown strong correlation between presence low-entropy cool core both star formation...