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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.

Michele Cappellari

Professor of Astrophysics

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Galaxy formation and evolution
  • Extremely Large Telescope
michele.cappellari@physics.ox.ac.uk
Telephone: 01865 (2)73647
Denys Wilkinson Building, room 755
  • About
  • Publications

WISDOM project – XXIII. Star-formation efficiencies of eight early-type galaxies and bulges observed with SITELLE and ALMA

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 540:1 (2025) staf675

Authors:

Anan Lu, Daryl Haggard, Martin Bureau, Jindra Gensior, Carmelle Robert, Thomas G Williams, Fu-Heng Liang, Woorak Choi, Timothy A Davis, Ilaria Ruffa, Sara Babic, Hope Boyce, Michele Cappellari, Benjamin Cheung, Laurent Drissen, Jacob S Elford, Thomas Martin, Carter Rhea, Laurie Rousseau-Nepton, Marc Sarzi, Hengyue Zhang

Abstract:

Early-type galaxies (ETGs) are known to harbour dense spheroids of stars with scarce star formation (SF). Approximately a quarter of these galaxies have rich molecular gas reservoirs yet do not form stars efficiently. These gas-rich ETGs have properties similar to those of bulges at the centres of spiral galaxies. We use spatially resolved observations (∼100 pc resolution) of warm ionized-gas emission lines (Hβ, [O iii], [N ii], H, and [S ii]) from the imaging Fourier transform spectrograph SITELLE at the Canada-France-Hawaii Telescope and cold molecular gas [12CO(2-1) or 12CO(3-2)] from the Atacama Large Millimeter/submillimeter Array to study the SF properties of eight ETGs and bulges. We use the ionized-gas emission lines to classify the ionization mechanisms and demonstrate a complete absence of regions dominated by SF ionization in these ETGs and bulges, despite abundant cold molecular gas. The ionization classifications also show that our ETGs and bulges are dominated by old stellar populations. We use the molecular gas surface densities and H -derived SF rates (in spiral galaxies outside of the bulges) or upper limits (in ETGs and bulges) to constrain the depletion times (inverse of the SF efficiencies), suggesting again suppressed SF in our ETGs and bulges. Finally, we use the molecular gas velocity fields to measure the gas kinematics, and show that bulge dynamics, particularly the strong shear due to the deep and steep gravitational potential wells, is an important SF regulation mechanism for at least half of our sample galaxies.
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WISDOM project -- XXIII. Star-formation efficiencies of eight early-type galaxies and bulges observed with SITELLE and ALMA

(2025)

Authors:

Anan Lu, Daryl Haggard, Martin Bureau, Jindra Gensior, Carmelle Robert, Thomas G Williams, Fu-Heng Liang, Woorak Choi, Timothy A Davis, Ilaria Ruffa, Sara Babic, Hope Boyce, Michele Cappellari, Benjamin Cheung, Laurent Drissen, Jacob S Elford, Thomas Martin, Carter Rhea, Laurie Rousseau-Nepton, Marc Sarzi, Hengyue Zhang
More details from the publisher

E-INSPIRE - I. Bridging the gap with the local Universe: Stellar population of a statistical sample of ultra-compact massive galaxies at z < 0.3

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2025) staf516

Authors:

John Mills, Chiara Spiniello, Alexey Sergeyev, Crescenzo Tortora, Vladyslav Khramtsov, Giuseppe D’Ago, Michalina Maksymowicz-Maciata, João PV Benedetti, Anna Ferré-Mateu, Michele Cappellari, Roger Davies, Johanna Hartke, Charles Rosen
More details from the publisher

Early-Type Galaxies: Elliptical and S0 Galaxies, or Fast and Slow Rotators

(2025)
Details from ArXiV

E-INSPIRE -- I. Bridging the gap with the local Universe: Stellar population of a statistical sample of ultra-compact massive galaxies at $z<0.3$

(2025)

Authors:

John Mills, Chiara Spiniello, Alexey Sergeyev, Crescenzo Tortora, Vladyslav Khramtsov, Giuseppe D'Ago, Michalina Maksymowicz-Maciata, João PV Benedetti, Anna Ferré-Mateu, Michele Cappellari, Roger Davies, Johanna Hartke, Charles Rosen
More details from the publisher

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