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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 Aayush Saxena

Postdoctoral Research Assistant

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Cosmology
  • Galaxy formation and evolution
aayush.saxena@physics.ox.ac.uk
Denys Wilkinson Building, room 558
Aayush Saxena's website
  • About
  • Publications

Extreme emission line galaxies detected in JADES JWST/NIRSpec – I. Inferred galaxy properties

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 535:2 (2024) 1796-1828

Authors:

Kit Boyett, Andrew J Bunker, Emma Curtis-Lake, Jacopo Chevallard, Alex J Cameron, Gareth C Jones, Aayush Saxena, Stéphane Charlot, Mirko Curti, Imaan EB Wallace, Santiago Arribas, Stefano Carniani, Chris Willott, Stacey Alberts, Daniel J Eisenstein, Kevin Hainline, Ryan Hausen, Benjamin D Johnson, Marcia Rieke, Brant Robertson, Daniel P Stark, Sandro Tacchella, Christina C Williams, Zuyi Chen, Eiichi Egami, Ryan Endsley, Nimisha Kumari, Isaac Laseter, Tobias J Looser, Michael V Maseda, Jan Scholtz, Irene Shivaei, Charlotte Simmonds, Renske Smit, Hannah Übler, Joris Witstok
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JADES NIRSpec initial data release for the Hubble Ultra Deep Field

Astronomy & Astrophysics EDP Sciences 690 (2024) a288

Authors:

Andrew J Bunker, Alex J Cameron, Emma Curtis-Lake, Peter Jakobsen, Stefano Carniani, Mirko Curti, Joris Witstok, Roberto Maiolino, Francesco D’Eugenio, Tobias J Looser, Chris Willott, Nina Bonaventura, Kevin Hainline, Hannah Übler, Christopher NA Willmer, Aayush Saxena, Renske Smit, Stacey Alberts, Santiago Arribas, William M Baker, Stefi Baum, Rachana Bhatawdekar, Rebecca AA Bowler, Kristan Boyett, Stephane Charlot, Zuyi Chen, Jacopo Chevallard, Chiara Circosta, Christa DeCoursey, Anna de Graaff, Eiichi Egami, Daniel J Eisenstein, Ryan Endsley, Pierre Ferruit, Giovanna Giardino, Ryan Hausen, Jakob M Helton, Raphael E Hviding, Zhiyuan Ji, Benjamin D Johnson, Gareth C Jones, Nimisha Kumari, Isaac Laseter, Nora Lützgendorf, Michael V Maseda, Erica Nelson, Eleonora Parlanti, Michele Perna, Bernard J Rauscher, Tim Rawle, Hans-Walter Rix, Marcia Rieke, Brant Robertson, Bruno Rodríguez Del Pino, Lester Sandles, Jan Scholtz, Katherine Sharpe, Maya Skarbinski, Daniel P Stark, Fengwu Sun, Sandro Tacchella, Michael W Topping, Natalia C Villanueva, Imaan EB Wallace, Christina C Williams, Charity Woodrum
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The NIRSpec Wide GTO Survey

Astronomy & Astrophysics EDP Sciences 689 (2024) a73

Authors:

Michael V Maseda, Anna de Graaff, Marijn Franx, Hans-Walter Rix, Stefano Carniani, Isaac Laseter, Ugnė Dudzevičiūtė, Tim Rawle, Eleonora Parlanti, Santiago Arribas, Andrew J Bunker, Alex J Cameron, Stephane Charlot, Mirko Curti, Francesco D’Eugenio, Gareth C Jones, Nimisha Kumari, Roberto Maiolino, Hannah Übler, Aayush Saxena, Renske Smit, Chris Willott, Joris Witstok
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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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Glimmers in the Cosmic Dawn: A Census of the Youngest Supermassive Black Holes by Photometric Variability * * This research is based on observations made with the NASA/ESA Hubble Space Telescope obtained from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 526555. These observations are associated with programs 11563, 12498, and 17073

The Astrophysical Journal Letters American Astronomical Society 971:1 (2024) L16

Authors:

Matthew J Hayes, Jonathan C Tan, Richard S Ellis, Alice R Young, Vieri Cammelli, Jasbir Singh, Axel Runnholm, Aayush Saxena, Ragnhild Lunnan, Benjamin W Keller, Pierluigi Monaco, Nicolas Laporte, Jens Melinder

Abstract:

We report the first results from a deep near-infrared campaign with the Hubble Space Telescope to obtain late-epoch images of the Hubble Ultra Deep Field, 10–15 yr after the first epoch data were obtained. The main objectives are to search for faint active galactic nuclei (AGN) at high redshifts by virtue of their photometric variability and measure (or constrain) the comoving number density of supermassive black holes (SMBHs), n SMBH, at early times. In this Letter, we present an overview of the program and preliminary results concerning eight objects. Three variables are supernovae, two of which are apparently hostless with indeterminable redshifts, although one has previously been recorded as a z ≈ 6 object precisely because of its transient nature. Two further objects are clear AGN at z = 2.0 and 3.2, based on morphology and/or infrared spectroscopy from JWST. Three variable targets are identified at z = 6–7 that are also likely AGN candidates. These sources provide a first measure of n SMBH in the reionization epoch by photometric variability, which places a firm lower limit of 3 × 10−4 cMpc−3. After accounting for variability and luminosity incompleteness, we estimate n SMBH ≳ 8 × 10−3 cMpc−3, which is the largest value so far reported at these redshifts. This SMBH abundance is also strikingly similar to estimates of n SMBH in the local Universe. We discuss how these results test various theories for SMBH formation.
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