Alladi Ramakrishnan Hall

Origin of low surface brightness galaxies: A dynamical study

Arunima Banerjee

IISER-Tirupati

Low Surface Brighness Galaxies (LSBs), inspite of being gas rich, have low star formation rates and are,
therefore, low surface brightness in nature. We calculate QRW, the 2-component disc stability parameter as proposed by Romeo \& Wiegert (2011),
as a function of galactocentric radius R for a sample of five LSBs, for which mass models, as obtained from HI 21cm radio-sythesis observations and R-band photometry,
were available in the literature. We find that the median value of QminRW, the minimum of QRW over R, lies between 2.6 and 3.1 for our sample LSBs,
which is higher than the median value of 1.8 ± 0.3 for QminRW for a sampleof high surface brightness galaxies (HSBs) as obtained in earlier studies.
This clearly shows that LSBs have more stable discs than HSBs, which could explain their low star formation rates and, possibly, their low surface brightness nature.
Interestingly, the calculated values of QRW decrease only slightly (median QminRW ∼ 2.3 - 3) if the discs were taken to respond to the gravitational potential of the dark matter halo
only, but reduce by a factor of 2-3 (median QminRW ∼ 0.7 - 1.5) if they respond to their self-gravity alone.
This implies that the dark matter halo is crucial in regulating disc stability in LSBs, which may have important implications for models of galaxy formation and evolution.