The Structure of Halo Gas around M33

0506406 - ASÚ 2020 RIV GB eng C - Konferenční příspěvek (zahraniční konf.)
Keenan, O. - Davies, J. - Taylor, Rhys - Minchin, R.F.
The Structure of Halo Gas around M33.
Formation and Evolution of Galaxy Outskirts. Cambridge: Cambridge University Press, 2016, s. 244-247. Proceedings of the International Astronomical Union, IAU S321. ISBN 9781107169883.
[Symposium of the International Astronomical Union /321./. Toledo (ES), 14.03.2016-18.03.2016]
Institucionální podpora: RVO:67985815
Klíčová slova: galaxies clusters * dwarf galaxies * radio lines
Obor OECD: Astronomy (including astrophysics,space science)

Understanding the distribution of gas in and around galaxies is vital for our interpretation of galaxy formation and evolution. As part of the Arecibo Galaxy Environment Survey (AGES) we have observed the neutral hydrogen (HI) gas in and around the nearby Local Group galaxy M33 to a greater depth than previous observations. As part of this project we investigated the absence of optically detected dwarf galaxies in its neighbourhood, which is contrary to predictions of galaxy formation models. We observed 22 discrete clouds, 11 of which were previously undetected and none of which have optically detected counterparts. We find one particularly interesting hydrogen cloud, which has many similar characteristics to hydrogen distributed in the disk of a galaxy. This cloud, if it is at the distance of M33, has a HI mass of around 10(7) M-circle dot and a diameter of 18 kpc, making it larger in size than M33 itself.
Trvalý link: http://hdl.handle.net/11104/0297744