Theoretical Extragalactic Research Group

The 10 most recent publications from the research group:

  1. 1) The fate of the Antennae galaxies
    N. Lahén, P.H. Johansson,  A. Rantala, T. Naab, M. Frigo, 2017, MNRAS submitted, ArXiv: 1709. 00010

  2. 2) Shaken and stirred: the Milky Way’s dark substructures
    T. Sawala, P. Pihajoki, P.H. Johansson, C. Frenk, J.F. Navarro, K.A. Oman, S.D.M. White, 2017, MNRAS, 467, 4383

  3. 3) Post-Newtonian Dynamical Modeling of Supermassive Black Holes in Galactic-scale Simulations
    A. Rantala, P. Pihajoki, P.H. Johansson, T. Naab, N. Lahén, T. Sawala, 2017, ApJ, 840, 53

  4. 4) A geometric approach to non-linear correlations with intrinsic scatter
    P. Pihajoki, 2017, MNRAS in press, ArXiv: 1704.05466

  5. 5) Rapid formation of massive black holes in close proximity to embryonic protogalaxies
    J.A. Regan, E. Visbal, J.H. Wise, Z. Haiman, P.H. Johansson, G.L. Bryan, 2017, Nature Astronomy, 1, 0075

  6. 6) The properties of ‘dark’ LCDM haloes in the Local Group
    A. Benitez-Llambay, J.F. Navarro, C.S. Frenk, T. Sawala, K.A. Oman, A. Fattahi, M. Schaller, J. Schaye, R.A. Crain, T. Theuns, 2017, MNRAS, 465, 3913

  7. 7) The oldest and most metal-poor stars in the APOSTLE Local Group simulations
    E. Starkenburg, K.A. Oman, J.F. Navarro, R.A. Crain, A. Fattahi, C.S. Frenk, T. Sawala, J. Schaye, 2017, MNRAS, 465, 2212

  8. 8) The Co-Evolution of Total Density Profiles and Central Dark Matter Fractions in Simulated Early-type Galaxies
    R.-S. Remus, K. Dolag, T. Naab, A. Burkert, M. Hirschmann, T.L. Hoffmann, P.H. Johansson, 2017, MNRAS, 464, 3742

  9. 9) The low-mass end of the baryonic Tully-Fisher relation
    L. V. Sales, J.F. Navarro, K.A. Oman, A. Fattahi, I. Ferrero, M. Abadi, R. Bower, R.A. Crain, C.S. Frenk, T. Sawala, M. Schaller, J. Schaye, T. Theuns, S.D.M. White, 2017, MNRAS, 464, 2419

  10. 10) Shutting down or powering up a (U)LIRG? Merger components in distinctly different evolutionary states in IRAS 19115-2124 (The Bird)
    P. Väisänen, J. Reunanen, J. Kotilainen, S. Mattila, P.H. Johansson, R. Ramphul, C. Romero-Canizalez, H. Kuncarayakti, 2017, MNRAS, 471, 2059

Current members in the research group:

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

Dr. Pauli Pihajoki (postdoc)

M.Sc. Antti Rantala (PhD student)

M.Sc. Natalia Lahén (PhD student)
B.Sc. Anni Järvenpää (undergraduate student)

B.Sc. Matias Mannerkoski (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)
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. 3) Natalia Lahén: “Equal-mass Galaxy Mergers: Initial Conditions and Subresolution Astrophysics”, April, 2015

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

  3. 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):

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

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

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

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

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

  9. 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.