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An image of the GOODS-South field as observed by JWST. More than 45,000 galaxies are visible here.

An image of the GOODS-South field as observed by JWST. More than 45,000 galaxies are visible here. In this image, blue, green, and red were assigned to Webb’s NIRCam (Near-Infrared Camera) data at 0.9, 1.15, and 1.5 microns; 2.0, 2.77, and 3.55 microns; and 3.56, 4.1, and 4.44 microns (F090W, F115W, and F150W; F200W, F277W, and F335M; and F356W, F410M, and F444W), respectively.

Credit: NASA, ESA, CSA, B. Robertson (UC Santa Cruz), B. Johnson (Center for Astrophysics, Harvard & Smithsonian), S. Tacchella (Univers

Dr Jacopo Chevallard

Postdoctoral Research Assistant

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Galaxy formation and evolution
jacopo.chevallard@physics.ox.ac.uk
Telephone: 01865 273467
Denys Wilkinson Building, room 463
  • About
  • Publications

Searching for Emission Lines at z > 11: The Role of Damped Lyα and Hints About the Escape of Ionizing Photons

The Astrophysical Journal American Astronomical Society 976:2 (2024) 160

Authors:

Kevin N Hainline, Francesco D’Eugenio, Peter Jakobsen, Jacopo Chevallard, Stefano Carniani, Joris Witstok, Zhiyuan Ji, Emma Curtis-Lake, Benjamin D Johnson, Brant Robertson, Sandro Tacchella, Mirko Curti, Stephane Charlot, Jakob M Helton, Santiago Arribas, Rachana Bhatawdekar, Andrew J Bunker, Alex J Cameron, Eiichi Egami, Daniel J Eisenstein, Ryan Hausen, Nimisha Kumari, Roberto Maiolino, Pablo G Pérez-González, Marcia Rieke, Aayush Saxena, Jan Scholtz, Renske Smit, Fengwu Sun, Christina C Williams, Christopher NA Willmer, Chris Willott
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JADES: Primaeval Lyman-α emitting galaxies reveal early sites of reionisation out to redshift z ∼ 9

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2024) stae2535

Authors:

Joris Witstok, Roberto Maiolino, Renske Smit, Gareth C Jones, Andrew J Bunker, Jakob M Helton, Benjamin D Johnson, Sandro Tacchella, Aayush Saxena, Santiago Arribas, Rachana Bhatawdekar, Kristan Boyett, Alex J Cameron, Phillip A Cargile, Stefano Carniani, Stephane Charlot, Jacopo Chevallard, Mirko Curti, Emma Curtis-Lake, Francesco D’Eugenio, Daniel J Eisenstein, Kevin Hainline, Ryan Hausen, Nimisha Kumari, Isaac Laseter, Michael V Maseda, Marcia Rieke, Brant Robertson, Jan Scholtz, Irene Shivaei, Christina C Williams, Christopher NA Willmer, Chris Willott
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JADES + JEMS: A Detailed Look at the Buildup of Central Stellar Cores and Suppression of Star Formation in Galaxies at Redshifts 3 < z < 4.5

The Astrophysical Journal American Astronomical Society 974:1 (2024) 135

Authors:

Zhiyuan Ji, Christina C Williams, Sandro Tacchella, Katherine A Suess, William M Baker, Stacey Alberts, Andrew J Bunker, Benjamin D Johnson, Brant Robertson, Fengwu Sun, Daniel J Eisenstein, Marcia Rieke, Michael V Maseda, Kevin Hainline, Ryan Hausen, George Rieke, Christopher NA Willmer, Eiichi Egami, Irene Shivaei, Stefano Carniani, Stephane Charlot, Jacopo Chevallard, Emma Curtis-Lake, Tobias J Looser

Abstract:

We present a spatially resolved study of stellar populations in six galaxies with stellar masses M * ∼ 1010 M ☉ at z ∼ 3.7 using 14-filter James Webb Space Telescope (JWST)/NIRCam imaging from the JADES and JEMS surveys. The six galaxies are visually selected to have clumpy substructures with distinct colors over rest frame 3600−4100 Å, including a red, dominant stellar core that is close to their stellar-light centroids. With 23-filter photometry from the Hubble Space Telescope to JWST, we measure the stellar-population properties of individual structural components via spectral energy distribution fitting using Prospector. We find that the central stellar cores are ≳2 times more massive than the Toomre mass, indicating they may not form via single in situ fragmentation. The stellar cores have stellar ages of 0.4−0.7 Gyr that are similar to the timescale of clump inward migration due to dynamical friction, suggesting that they likely instead formed through the coalescence of giant stellar clumps. While they have not yet quenched, the six galaxies are below the star-forming main sequence by 0.2−0.7 dex. Within each galaxy, we find that the specific star formation rate is lower in the central stellar core, and the stellar-mass surface density of the core is already similar to quenched galaxies of the same masses and redshifts. Meanwhile, the stellar ages of the cores are either comparable to or younger than the extended, smooth parts of the galaxies. Our findings are consistent with model predictions of the gas-rich compaction scenario for the buildup of galaxies’ central regions at high redshifts. We are likely witnessing the coeval formation of dense central cores, along with the onset of galaxy-wide quenching at z > 3.
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JADES: Carbon enrichment 350 Myr after the Big Bang

Astronomy & Astrophysics EDP Sciences 689 (2024) a152

Authors:

Francesco D’Eugenio, Roberto Maiolino, Stefano Carniani, Jacopo Chevallard, Emma Curtis-Lake, Joris Witstok, Stephane Charlot, William M Baker, Santiago Arribas, Kristan Boyett, Andrew J Bunker, Mirko Curti, Daniel J Eisenstein, Kevin Hainline, Zhiyuan Ji, Benjamin D Johnson, Nimisha Kumari, Tobias J Looser, Kimihiko Nakajima, Erica Nelson, Marcia Rieke, Brant Robertson, Jan Scholtz, Renske Smit, Fengwu Sun, Giacomo Venturi, Sandro Tacchella, Hannah Übler, Christopher NA Willmer, Chris Willott
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The star-forming and ionizing properties of dwarf z ~ 6–9 galaxies in JADES: insights on bursty star formation and ionized bubble growth

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 533:1 (2024) 1111-1142

Authors:

Ryan Endsley, Daniel P Stark, Lily Whitler, Michael W Topping, Benjamin D Johnson, Brant Robertson, Sandro Tacchella, Stacey Alberts, William M Baker, Rachana Bhatawdekar, Kristan Boyett, Andrew J Bunker, Alex J Cameron, Stefano Carniani, Stephane Charlot, Zuyi Chen, Jacopo Chevallard, Emma Curtis-Lake, A Lola Danhaive, Eiichi Egami, Daniel J Eisenstein, Kevin Hainline, Jakob M Helton, Zhiyuan Ji, Tobias J Looser, Roberto Maiolino, Erica Nelson, Dávid Puskás, George Rieke, Marcia Rieke, Hans-Walter Rix, Lester Sandles, Aayush Saxena, Charlotte Simmonds, Renske Smit, Fengwu Sun, Christina C Williams, Christopher NA Willmer, Chris Willott, Joris Witstok
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