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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.

Dr Hengxing Pan

Visitor

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Cosmology
  • Galaxy formation and evolution
  • MeerKAT
  • The Square Kilometre Array (SKA)
hengxing.pan@physics.ox.ac.uk
  • About
  • Publications

New Constraints on the Evolution of the MH i−M⋆ Scaling Relation Combining CHILES and MIGHTEE-H i Data

The Astrophysical Journal American Astronomical Society 982:2 (2025) 82

Authors:

Alessandro Bianchetti, Francesco Sinigaglia, Giulia Rodighiero, Ed Elson, Mattia Vaccari, DJ Pisano, Nicholas Luber, Isabella Prandoni, Kelley Hess, Maarten Baes, Elizabeth AK Adams, Filippo M Maccagni, Alvio Renzini, Laura Bisigello, Min Yun, Emmanuel Momjian, Hansung B Gim, Hengxing Pan, Thomas A Oosterloo, Richard Dodson, Danielle Lucero, Bradley S Frank, Olivier Ilbert, Luke JM Davies, Ali A Khostovan, Mara Salvato
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Looking at the Distant Universe with the MeerKAT Array: The H i Mass Function in the Local Universe

The Astrophysical Journal American Astronomical Society 981:2 (2025) 208

Authors:

Amir Kazemi-Moridani, Andrew J Baker, Marc Verheijen, Eric Gawiser, Sarah-Louise Blyth, Danail Obreschkow, Laurent Chemin, Jordan D Collier, Kyle W Cook, Jacinta Delhaize, Ed Elson, Bradley S Frank, Marcin Glowacki, Kelley M Hess, Benne W Holwerda, Zackary L Hutchens, Matt J Jarvis, Melanie Kaasinen, Sphesihle Makhathini, Abhisek Mohapatra, Hengxing Pan, Anja C Schröder, Leyya Stockenstroom, Mattia Vaccari, Tobias Westmeier, John F Wu, Martin Zwaan
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Deep extragalactic H i survey of the COSMOS field with FAST

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 534:1 (2024) 202-214

Authors:

Hengxing Pan, Matt J Jarvis, Ming Zhu, Yin-Zhe Ma, Mario G Santos, Anastasia A Ponomareva, Ian Heywood, Yingjie Jing, Chen Xu, Ziming Liu, Yogesh Chandola, Yipeng Jing
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MIGHTEE-H i: deep spectral line observations of the COSMOS field

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 534:1 (2024) 76-96

Authors:

I Heywood, AA Ponomareva, N Maddox, MJ Jarvis, BS Frank, EAK Adams, M Baes, A Bianchetti, JD Collier, RP Deane, M Glowacki, SL Jung, H Pan, SHA Rajohnson, G Rodighiero, I Ruffa, MG Santos, F Sinigaglia, M Vaccari
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MIGHTEE-HI: HI galaxy properties in the large scale structure environment at z ∼ 0.37 from a stacking experiment

Monthly Notices of the Royal Astronomical Society Oxford University Press 529:4 (2024) 4192-4209

Authors:

Francesco Sinigaglia, Giulia Rodighiero, Ed Elson, Alessandro Bianchetti, Mattia Vaccari, Natasha Maddox, Anastasia A Ponomareva, Bradley S Frank, Matt J Jarvis, Barbara Catinella, Luca Cortese, Sambit Roychowdhury, Maarten Baes, Jordan D Collier, Olivier Ilbert, Ali A Khostovan, Sushma Kurapati, Hengxing Pan, Isabella Prandoni, Sambatriniaina HA Rajohnson, Mara Salvato, Srikrishna Sekhar, Gauri Sharma

Abstract:

We present the first measurement of HI mass of star-forming galaxies in different large scale structure environments from a blind survey at z ∼ 0.37. In particular, we carry out a spectral line stacking analysis considering 2875 spectra of colour-selected star-forming galaxies undetected in HI at 0.23 < z < 0.49 in the COSMOS field, extracted from the MIGHTEE-HI Early Science datacubes, acquired with the MeerKAT radio telescope. We stack galaxies belonging to different subsamples depending on three different definitions of large scale structure environment: local galaxy overdensity, position inside the host dark matter halo (central, satellite, or isolated), and cosmic web type (field, filament, or knot). We first stack the full star-forming galaxy sample and find a robust HI detection yielding an average galaxy HI mass of MHI = (8.12 ± 0.75) × 109 M⊙ at ∼11.8σ. Next, we investigate the different subsamples finding a negligible difference in MHI as a function of the galaxy overdensity. We report an HI excess compared to the full sample in satellite galaxies (MHI = (11.31 ± 1.22) × 109, at ∼10.2σ) and in filaments (MHI = (11.62 ± 0.90) × 109. Conversely, we report non-detections for the central and knot galaxies subsamples, which appear to be HI-deficient. We find the same qualitative results also when stacking in units of HI fraction (fHI). We conclude that the HI amount in star-forming galaxies at the studied redshifts correlates with the large scale structure environment.
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