The Vast Polar Structure around the Milky Way
Animated version of Figure 5 in Pawlowski et al. (2012):
The vast polar structure – VPOS – about the MW in Cartesian coordinates. The movie rotates the view over 360º, adding different objects around the Milky Way galaxy. The y-axis points towards the Galactic north pole. The 11 classical satellites are shown as yellow dots, the 13 new satellites are represented by the smaller green dots, young halo globular clusters are plotted as blue squares. The red curves connect the anchor points of streams of stars and gas, the (light-red) shaded regions illustrating the planes defined by these and the Galactic centre. Note that the stream coordinates are magnified by a factor of 3 to ease the comparison. The obscuration-region 10º around the Milky Way disc is given by the horizontal grey areas. In the centre, the Milky Way disc orientation (edge-on) is shown by a short horizontal cyan line. One can clearly see when the view is edge-on to the VPOS: The extend of all types of objects becomes minimal, also the streams align preferentially with this structure. From standard dark matter cosmology, a much more spheroidal distribution of objects around the Milky Way is expected. We therefore propose the satellite galaxies of the Milky Way to be Tidal Dwarf Galaxies.
REFERENCE: M. S. Pawlowski, J. Pflamm-Altenburg, P. Kroupa: “The VPOS: a vast polar structure of satellite galaxies, globular clusters and streams around the Milky Way”, MNRAS, 2012
YouTube link: http://www.youtube.com/watch?v=nUwxv-WGfHM
Download: VPOS.m4v (7 MB)
The poster is based on these of my publications:
- ‘Making counter-orbiting tidal debris. The origin of the Milky Way disc of satellites?’, Pawlowski, Kroupa, de Boer, 2011, A&A, 532, 118.
- ‘The VPOS: a vast polar structure of satellite galaxies, globular clusters and streams around the MW’, Pawlowski, Pflamm-Altenburg, Kroupa, 2012, MNRAS, 423, 1109.
- ‘Filamentary accretion cannot explain the orbital poles of the Milky Way satellites’, M. S. Pawlowski, P. Kroupa, G. Angus et al., 2012, MNRAS, 424, 80.
- ‘Dwarf galaxy planes: the discovery of symmetric structures in the Local Group’, Pawlowski, Kroupa & Jerjen, 2013, MNRAS, 435, 1928.
- ‘The rotationally stabilized VPOS and predicted proper motions of the Milky Way satellite galaxies’, Pawlowski & Kroupa, 2013, MNRAS, 435, 2116.
- ‘Co-orbiting satellite galaxy structures are still in conflict with the distribution of primordial dwarf galaxies’, Pawlowski, Famaey, Jerjen, et al., 2014, MNRAS, 442, 2362.
- ‘Co-orbiting Planes of Sub-halos are Similarly Unlikely around Paired and Isolated Hosts’, Pawlowski & McGaugh, 2014, ApJL, 789, 24.
- ‘The Vast Polar Structure of the Milky Way Attains New Members’, Pawlowski & Kroupa, 2014, ApJ, 790, 74.
- ‘Perseus I and the NGC 3109 association in the context of the Local Group dwarf galaxy structures’, Pawlowski & McGaugh, 2014, MNRAS, 440, 908.
- Bahl & Baumgardt, 2014, MNRAS, 438, 2916.
- Goerdt & Burkert, 2013, arXiv:1307.2102.
- Hammer, Yang, Fouquet, et al., 2013, MNRAS, 431, 3543.
- Ibata, Lewis, Conn, et al., 2013, Nature, 493, 62.
- Ibata, Ibata, Lewis, et al., 2014, ApJL, 784, 6.
- Ibata, Ibata, Famaey, & Lewis, 2014, Nature, 511, 563.
- Lovell, Eke, Frenk, Jenkins, 2011, MNRAS, 413, 3013.
- Wang, Frenk, & Cooper, 2013, MNRAS, 429, 1502.
- Zhao, Famaey, Lü}ghausen, & Kroupa, 2013, A&A, 557, 3.