Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jena.confe.192s&link_type=abstract
JENAM-2011, European Week of Astronomy and Space Science, held 4-8 July 2011 in St.Petersburg, Russia. Book of abstracts, p.192-
Astronomy and Astrophysics
Astronomy
Scientific paper
Malin 1 is a unique, extraordinarily large low surface brightness galaxy. The structure and the origins of the galaxy are poorly understood. The reason for such a situation is an absence of detailed observational data, especially, of high-resolution kinematics. In order to investigate stellar kinematics of Malin 1, we have performed spectroscopic study of the galaxy with the Russian 6-m telescope. We discovered a small companion galaxy - Malin 1B, - and concluded that Malin 1 undergoes a minor merger with this companion galaxy. This galaxy is at the projected distance of 14 kpc and sjows a small velocity difference with Malin 1 systemic velocity (dV=65 km/s). Accreting companion might be responsible for the main morphological features in the central part of Malin 1. It could produce a two-armed inner structure and trigger the bar instability. Also, one can relate this companion with one-armed spiral pattern in Malin 1 disk. Malin 1 is found to be in low-density large-scale spatial environments typical for LSB galaxies. We discuss the possible origins of Malin 1 global structure due to a bygone head-on collision with a massive intruder - SDSS J123708.91+142253.2. Spectral data were also used for "matching" the central stellar kinematics corrected for asymmetric drift with HI kinematics in the outer regions. This allowed us to recover the rotation curve up to 150 kpc from the nucleus! We analysed the whole rotation curve and determined the contribution of the dark halo.
Moiseev Aleksei V.
Reshetnikov V. P.
Sotnikova Natalia Ya.
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