Skip to main content
Home
Department Of Physics text logo
  • Research
    • Our research
    • Our research groups
    • Our research in action
    • Research funding support
    • Summer internships for undergraduates
  • Study
    • Undergraduates
    • Postgraduates
  • Engage
    • For alumni
    • For business
    • For schools
    • For the public
Menu
Black Hole

Lensing of space time around a black hole. At Oxford we study black holes observationally and theoretically on all size and time scales - it is some of our core work.

Credit: ALAIN RIAZUELO, IAP/UPMC/CNRS. CLICK HERE TO VIEW MORE IMAGES.

Catherine Hale

Visitor

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Cosmology
  • Galaxy formation and evolution
  • Hintze Centre for Astrophysical Surveys
  • MeerKAT
  • The Square Kilometre Array (SKA)
catherine.hale@physics.ox.ac.uk
Denys Wilkinson Building, room 464
  • About
  • Publications

Cosmology from LOFAR Two-metre Sky Survey Data Release 2: Cross-correlations with luminous red galaxies from eBOSS

Astronomy & Astrophysics EDP Sciences 698 (2025) a58

Authors:

Jinglan Zheng, Prabhakar Tiwari, Gong-Bo Zhao, Dominik J Schwarz, David Bacon, Stefano Camera, Caroline Heneka, Catherine Hale, Szymon J Nakoneczny, Morteza Pashapour-Ahmadabadi
More details from the publisher

The Evolutionary Map of the Universe: A new radio atlas for the southern hemisphere sky

Publications of the Astronomical Society of Australia Cambridge University Press 42 (2025) e071

Authors:

Andrew Hopkins, Anna Kapinska, Joshua Marvil, Tessa Vernstrom, Jordan Collier, Ray Norris, Yjan Gordon, Stefan Duchesne, Lawrence Rudnick, Nikhel Gupta, Ettore Carretti, Craig Anderson, Shi Dai, Gulay Gürkan, David Parkinson, Isabella Prandoni, Simone Riggi, Chandra Shekhar Saraf, Yik Ki Ma, Miroslav D Filipović, Grazia Umana, Benedict Bahr-Kalus, Bärbel Silvia Koribalski, Emil Lenc, Catherine Laura Hale

Abstract:

We present the Evolutionary Map of the Universe (EMU) survey conducted with the Australian Square Kilometre Array Pathfinder (ASKAP). EMU aims to deliver the touchstone radio atlas of the southern hemisphere. We introduce EMU and review its science drivers and key science goals, updated and tailored to the current ASKAP five-year survey plan. The development of the survey strategy and planned sky coverage is presented, along with the operational aspects of the survey and associated data analysis, together with a selection of diagnostics demonstrating the imaging quality and data characteristics. We give a general description of the value-added data pipeline and data products before concluding with a discussion of links to other surveys and projects and an outline of EMU’s legacy value.
More details from the publisher
Details from ORA
More details

Cross-correlating the EMU Pilot Survey 1 with CMB lensing: Constraints on cosmology and galaxy bias with harmonic-space power spectra

Publications of the Astronomical Society of Australia Cambridge University Press 42 (2025) e062

Authors:

Konstantinos Tanidis, Jacobo Asorey, Chandra Shekhar Saraf, Catherine Laura Hale, Benedict Bahr-Kalus, David Parkinson, Stefano Camera, Ray Norris, Andrew Hopkins, Maciej Bilicki, Nikhel Gupta

Abstract:

We measured the harmonic-space power spectrum of Galaxy clustering auto-correlation from the Evolutionary Map of the Universe Pilot Survey 1 data (EMU PS1) and its cross-correlation with the lensing convergence map of cosmic microwave background (CMB) from Planck Public Release 4 at the linear scale range from to 500. We applied two flux density cuts at and mJy on the radio galaxies observed at 944MHz and considered two source detection algorithms. We found the auto-correlation measurements from the two algorithms at the 0.18 mJy cut to deviate for due to the different criteria assumed on the source detection and decided to ignore data above this scale. We report a cross-correlation detection of EMU PS1 with CMB lensing at 5.5 , irrespective of flux density cut. In our theoretical modelling we considered the SKADS and T-RECS redshift distribution simulation models that yield consistent results, a linear and a non-linear matter power spectrum, and two linear galaxy bias models. That is a constant redshift-independent galaxy bias and a constant amplitude galaxy bias . By fixing a cosmology model and considering a non-linear matter power spectrum with SKADS, we measured a constant galaxy bias at mJy ( mJy) with ( ) and a constant amplitude bias with ( ). When is a free parameter for the same models at mJy ( mJy) with the constant model we found ( ), while with the constant amplitude model we measured ( ), respectively. Our results agree at with the measurements from Planck CMB and the weak lensing surveys and also show the potential of cosmology studies with future radio continuum survey data.
More details from the publisher
Details from ORA

The Evolutionary Map of the Universe: A new radio atlas for the southern hemisphere sky

(2025)

Authors:

AM Hopkins, A Kapinska, J Marvil, T Vernstrom, JD Collier, RP Norris, YA Gordon, SW Duchesne, L Rudnick, N Gupta, E Carretti, CS Anderson, S Dai, G Gürkan, D Parkinson, I Prandoni, S Riggi, CS Saraf, YK Ma, MD Filipović, G Umana, B Bahr-Kalus, BS Koribalski, E Lenc, A Ingallinera, J Afonso, A Ahmad, UT Ahmed, EL Alexander, H Andernach, J Asorey, AJ Battisti, M Bilicki, A Botteon, MJI Brown, M Brüggen, M Cowley, KC Dage, CL Hale, MJ Hardcastle, R Kothes, S Lazarević, Y-T Lin, KJ Luken, JP Moss, J Prathap, SF Rahman, TH Reiprich, CJ Riseley, M Salvato, N Seymour, SS Shabala, DJB Smith, M Vaccari, J Th van Loon, OI Wong, RZE Alsaberi, AD Asher, BD Ball, D Barbosa, N Biava, AC Bradley, R Carvajal, EJ Crawford, TJ Galvin, MT Huynh, DA Leahy, I Matute, VA Moss, C Pappalardo, ZJ Smeaton, V Velović, T Zafar

On the relationship between the cosmic web and the alignment of galaxies and AGN jets

Monthly Notices of the Royal Astronomical Society Oxford University Press 539:3 (2025) 2362-2379

Authors:

S Lyla Jung, IH Whittam, MJ Jarvis, CL Hale, MN Tudorache, T Yasin

Abstract:

The impact of active galactic nuclei (AGNs) on the evolution of galaxies explains the steep decrease in the number density of the most massive galaxies in the Universe. However, the fuelling of the AGN and the efficiency of this feedback largely depend on their environment. We use data from the Low Frequency Array Two-metre Sky Survey Data Release 2 (DR2), the Dark Energy Spectroscopic Instrument Legacy Imaging Surveys, and the Sloan Digital Sky Survey DR12 to make the first study of the orientations of radio jets and their optical counterpart in relation to the cosmic web environment. We find that close to filaments (), galaxies tend to have their optical major axes aligned with the nearest filaments. On the other hand, radio jets, which are generally aligned perpendicularly to the optical major axis of the host galaxy, show more randomized orientations with respect to host galaxies within of filaments. These results support the scenario that massive galaxies in cosmic filaments grow by numerous mergers directed along the orientation of the filaments while experiencing chaotic accretion of gas on to the central black hole. The AGN-driven jets consequently have a strong impact preferentially along the minor axes of dark matter haloes within filaments. We discuss the implications of these results for large-scale radio jet alignments, intrinsic alignments between galaxies, and the azimuthal anisotropy of the distribution of circumgalactic medium and anisotropic quenching.
More details from the publisher
Details from ORA
More details

Pagination

  • First page First
  • Previous page Prev
  • Page 1
  • Current page 2
  • Page 3
  • Page 4
  • Page 5
  • Page 6
  • Page 7
  • Next page Next
  • Last page Last

Footer Menu

  • Contact us
  • Giving to the Dept of Physics
  • Work with us
  • Media

User account menu

  • Log in

Follow us

FIND US

Clarendon Laboratory,

Parks Road,

Oxford,

OX1 3PU

CONTACT US

Tel: +44(0)1865272200

University of Oxfrod logo Department Of Physics text logo
IOP Juno Champion logo Athena Swan Silver Award logo

© University of Oxford - Department of Physics

Cookies | Privacy policy | Accessibility statement

Built by: Versantus

  • Home
  • Research
  • Study
  • Engage
  • Our people
  • News & Comment
  • Events
  • Our facilities & services
  • About us
  • Current students
  • Staff intranet