Theoretical Extragalactic Research Group

The 10 most recent publications from the research group:

  1. 1) The aftermath of the Great Collision between our Galaxy and the Large Magellanic Cloud
    M. Cautun, A.J. Deason, C.S. Frenk, S. McAlpine, 2018, MNRAS in press, ArXiv: 1809.09116

  2. 2) Authenticating the Presence of a Relativistic Massive Black Hole Binary in OJ 287 Using Its General Relativity Centenary Flare: Improved Orbital Parameters
    L. Dey, M.J. Valtonen, A. Gopakumar, S. Zola, R. Hudec,
    P. Pihajoki
    et al., 2018, ApJ, 866, 11

  3. 3)The formation of extremely diffuse galaxy cores by merging supermassive black holes
    A. Rantala, P.H. Johansson, T. Naab, J. Thomas, M. Frigo, 2018, ApJ, 864, 113

  4. 4) General Purpose Ray Tracing and Polarized Radiative Transfer in General Relativity
    P. Pihajoki, M. Mannerkoski, J. Nättilä, P.H. Johansson, 2018, ApJ, 863, 8

  5. 5) Radiation from rapidly rotating oblate neutron stars
    J. Nättilä & P. Pihajoki, 2018, A&A, 615, 50

  6. 6) The origins of post-starburst galaxies at z < 0.05
    M.M. Pawlik, L.Taj Aldeen, V. Wild, J. Mendez-Abreu, N. Lahén, P.H. Johansson, N. Jimenez, W. Lucas, Y.  Zheng, C.J. Walcher, K. Rowlands, 2018, MNRAS, 477, 1708

  7. 7) Tidal stripping and the structure of dwarf galaxies in the Local Group
    A. Fattahi, J.F. Navarro, C.S. Frenk, K.A. Oman, T. Sawala, M. Schaller, 2018, MNRAS, 476, 3816

  8. 8) The fate of the Antennae galaxies
    N. Lahén, P.H. Johansson,  A. Rantala, T. Naab, M. Frigo, 2018, MNRAS, 475, 3934

  9. 9) The core-cusp problem: a matter of perspective
    A. Genina, A. Benitez-Llambay, C.S. Frenk, S. Cole, A. Fattahi, J.F. Navarro, K.A. Oman, T. Sawala, T. Theuns, 2018, MNRAS, 474, 1398

  10. 10) A geometric approach to non-linear correlations with intrinsic scatter
    P. Pihajoki,  2017, MNRAS, 472, 3407

Current members in the research group:

Prof. Peter Johansson (group leader)
Dr. Till Sawala (Academy research fellow)

Dr. Pauli Pihajoki (postdoc)

Dr. Stuart McAlpine (postdoc)

M.Sc. Antti Rantala (PhD student)

M.Sc. Natalia Lahén (PhD student)
M.Sc. Matias Mannerkoski (PhD student)

B.Sc. Vili Oja (undergraduate student)

B.Sc. Kasper Siilin (undergraduate student)

Past members of the research group:

Dr. John Regan (postdoc, now at Dublin City University)

Collaborators at the University of Helsinki:
Prof. Alexis Finoguenov
Prof. Kari Enqvist
Dr. Mika Juvela
Dr. Hannu Kurki-Suonio
Dr. Syksy Räsänen


External Collaborators:
Dr. Thorsten Naab (MPA)

Dr. Jens Thomas (MPE)
Prof. Jeremiah Ostriker (Columbia/Princeton)

Dr. John Regan (Dublin City University)
Dr. Vivienne Wild (St. Andrews)
Prof. John Wise (Georgia Institute of Technology)

Dr. Petri Väisänen (South African Astronomical Observatory)
Prof. Carlos Frenk (Durham)

Prof. Simon White (MPA)

Prof. Andreas Burkert (Munich)
Prof. Martin Haehnelt (Cambridge)
Prof. Rachel Somerville (Rutgers)

Dr. Ben Moster (Munich)

Dr. Ena Choi (Rutgers)
Dr. Rhea-Silvia Remus (Munich)


Supervision of theses:


Recent M.Sc. Theses completed in the research group:

  1. 6) Anni Järvenpää: “Statistical estimation of the Local Group Mass”, December, 2018

  2. 5) Matias Mannerkoski: “Ray-Tracing Based Polarized Radiative Transfer in General Spacetimes, March, 2018

  3. 4) Lasse Liljedahl: “The Effects of Supernova Feedback on Disk Galaxy Formation”, December, 2017

  4. 3) Natalia Lahén: “Equal-mass Galaxy Mergers: Initial Conditions and Subresolution Astrophysics”, April, 2015

  5. 2) Antti Rantala: “Forming Galaxies in Cosmological Zoom-in Simulations”, March, 2014.

  6. 1) Heidi Yli-Kankahila: “Formation of Early-type galaxies through mergers of gas-rich disk galaxies”, October, 2012.

    Recent B.Sc. Theses completed in the research group (in Finnish):

  7. 9) Kasper Siilin: “Kahden jakson inflaatio ja rakenteenmuodostus standardi-LCDM-kosmologiassa”, August, 2018

  8. 8) Vili Oja: “Ellipsigalaksien rakenne, synty ja kehitys”, July,  2018

  9. 7) Sanna Damsted: “Missä ovat puuttuvat kääpiögalaksit? - Tutkielma havaintojen ja LCDM-teorian välillä vallitsevan ristiriidan nykytilasta”, August, 2017

  10. 6) Antton Luoma “Spiraaligalaksien rakenne ja kehitys”, February 2016

  11. 5) Anni Järvenpää: “AMR-simulaatiotulosten visualisointi Pythonilla yt-pakettia käyttäen”, July 2015

  12. 4) Akke Viitanen: “Universumin suuren mittakaavan rakenne”, July 2015

  13. 3) Jussi Aaltonen: “Pimeä aine ja maailmankaikkeuden rakenteenmuodostus, March, 2015.

  14. 2) Natalia Lahén: “Galaksienväliset vuorovaikutukset”,
    February, 2014.

  15. 1) Antti Rantala: “Pimeä energia ja maailmankaikkeuden kiihtyvä laajeneminen”, July, 2012.


Research topics for B.Sc., M.Sc. and Ph.D. Theses:

Please come and talk to me in my office (D311) and/or send
me an email.