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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.

Prof Chris Lintott

Professor of Astrophysics and Citizen Science Lead

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Zooniverse
  • Beecroft Institute for Particle Astrophysics and Cosmology
  • Rubin-LSST
chris.lintott@physics.ox.ac.uk
Telephone: 01865 (2)73638
Denys Wilkinson Building, room 532C
www.zooniverse.org
orcid.org/0000-0001-5578-359X
  • About
  • Citizen science
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  • Publications

Zooniverse labs

Zooniverse lab
Build your own Zooniverse project

The Zooniverse lab lets anyone build their own citizen science project

Zooniverse Lab

EDITORIAL: THE AAS JOURNALS CORRIDOR FOR INSTRUMENTATION, SOFTWARE, LABORATORY ASTROPHYSICS, AND DATA

The Astronomical Journal American Astronomical Society 151:2 (2016) 21

Authors:

Ethan T Vishniac, Chris Lintott
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Blue early type galaxies with the MeerKAT

Proceedings of Science (2016)

Authors:

GIG Józsa, O Ivy Wong, T Mauch, K Schawinski, C Sengupta, K Masters, M Urry, C Lintott, B Simmons, S Kaviraj, P Kamphuis

Abstract:

We discuss a potential MeerKAT campaign to shed more light into the nature of the optically identified Blue Early Type galaxies (BETGs), a subset of the so-called "green valley" population, quenching star formation on time scales of less than 0.25 Gyr and the likely progenitor population of post-starburst galaxies. Employing a WSRT pilot survey of four galaxies, we have shown that BETGs have radio properties that fit to a mechanical removal of star forming material, potentially by AGN activity, as in particular we found H I to be removed farther and farther from the centre of the galaxies with older and older age of the stellar population. We argue that MeerKAT is the optimal instrument to conduct a pointed survey of BETGs to become more conclusive about this specific transition state, which is so rare that it will not be detected at a high enough rate in planned sufficiently sensitive large-sky surveys, for which we expect a total detection number of the order of 12 objects.

Extended X-ray emission in the IC 2497 - Hanny's Voorwerp system: energy injection in the gas around a fading AGN

Monthly Notices of the Royal Astronomical Society Oxford University Press (2016) stw230-stw230

Authors:

Lia F Sartori, Kevin Schawinski, Michael Koss, Ezequiel Treister, W Peter Maksym, William C Keel, C Megan Urry, Christopher Lintott, O Ivy Wong

Abstract:

We present deep Chandra X-ray observations of the core of IC 2497, the galaxy associated with Hanny's Voorwerp and hosting a fading AGN. We find extended soft X-ray emission from hot gas around the low intrinsic luminosity (unobscured) AGN ($L_{\rm bol} \sim 10^{42}-10^{44}$ erg s$^{-1}$). The temperature structure in the hot gas suggests the presence of a bubble or cavity around the fading AGN ($\mbox{E$_{\rm bub}$} \sim 10^{54} - 10^{55}$ erg). A possible scenario is that this bubble is inflated by the fading AGN, which after changing accretion state is now in a kinetic mode. Other possibilities are that the bubble has been inflated by the past luminous quasar ($L_{\rm bol} \sim 10^{46}$ erg s$^{-1}$), or that the temperature gradient is an indication of a shock front from a superwind driven by the AGN. We discuss the possible scenarios and the implications for the AGN-host galaxy interaction, as well as an analogy between AGN and X-ray binaries lifecycles. We conclude that the AGN could inject mechanical energy into the host galaxy at the end of its lifecycle, and thus provide a source for mechanical feedback, in a similar way as observed for X-ray binaries.
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Galaxy Zoo: morphological classifications for 120 000 galaxies in HST legacy imaging

Monthly Notices of the Royal Astronomical Society Oxford University Press 464:4 (2016) 4176-4203

Authors:

Kyle W Willett, Melanie A Galloway, Steven P Bamford, Christopher Lintott, Karen L Masters, Claudia Scarlata, BD Simmons, Melanie Beck, Carolin N Cardamone, Edmond Cheung, Edward M Edmondson, Lucy F Fortson, Roger L Griffith, Boris Haeussler, Anna Han, Ross Hart, Thomas Melvin, Michael Parrish, Kevin Schawinski, RJ Smethurst, Arfon M Smith

Abstract:

We present the data release paper for the Galaxy Zoo: Hubble (GZH) project. This is the third phase in a large effort to measure reliable, detailed morphologies of galaxies by using crowdsourced visual classifications of colour composite images. Images in GZH were selected from various publicly-released Hubble Space Telescope Legacy programs conducted with the Advanced Camera for Surveys, with filters that probe the rest-frame optical emission from galaxies out to $z \sim 1$. The bulk of the sample is selected to have $m_{I814W} < 23.5$,but goes as faint as $m_{I814W} < 26.8$ for deep images combined over 5 epochs. The median redshift of the combined samples is $z = 0.9 \pm 0.6$, with a tail extending out to $z \sim 4$. The GZH morphological data include measurements of both bulge- and disk-dominated galaxies, details on spiral disk structure that relate to the Hubble type, bar identification, and numerous measurements of clump identification and geometry. This paper also describes a new method for calibrating morphologies for galaxies of different luminosities and at different redshifts by using artificially-redshifted galaxy images as a baseline. The GZH catalogue contains both raw and calibrated morphological vote fractions for 119,849 galaxies, providing the largest dataset to date suitable for large-scale studies of galaxy evolution out to $z \sim 1$.
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PLANET HUNTERS. VIII. CHARACTERIZATION OF 41 LONG-PERIOD EXOPLANET CANDIDATES FROM KEPLER ARCHIVAL DATA* * This publication has been made possible by the participation of more than 200,000 volunteers in the Planet Hunters project. Their contributions are individually acknowledged at http://www.planethunters.org/#/acknowledgements

The Astrophysical Journal American Astronomical Society 815:2 (2015) 127

Authors:

Ji Wang, Debra A Fischer, Thomas Barclay, Alyssa Picard, Bo Ma, Brendan P Bowler, Joseph R Schmitt, Tabetha S Boyajian, Kian J Jek, Daryll LaCourse, Christoph Baranec, Reed Riddle, Nicholas M Law, Chris Lintott, Kevin Schawinski, Dean Joseph Simister, Boscher Grégoire, Sean P Babin, Trevor Poile, Thomas Lee Jacobs, Tony Jebson, Mark R Omohundro, Hans Martin Schwengeler, Johann Sejpka, Ivan A Terentev, Robert Gagliano, Jari-Pekka Paakkonen, Hans Kristian Otnes Berge, Troy Winarski, Gerald R Green, Allan R Schmitt, Martti H Kristiansen, Abe Hoekstra
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