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Title: Radio observations of the AGN and gas in low surface brightness galaxies
Authors: Das, Mousumi
O'Neil, K.
Kantharia, N.
Vogel, S.N.
McGaugh, S.S.
Keywords: Galaxies: active
Galaxies: radio continuum:
Issue Date: 2007
Publisher: CUP
Citation: Proceedings of the IAU symposium: galaxies evolution across the hubble time, 2007, Vol.235, p90
Abstract: We present millimetre and centimetre observations of the gas disks and AGN emission in a sample of low surface brightness (LSB) galaxies. Our results are part of a study that aims to understand the formation and evolution of LSB galaxies, especially giant LSB galaxies. These galaxies represent a very extreme population on the Hubble Sequence. They are morphologically similar to late type spirals but are much more dark matter dominated. They have massive HI disks but diffuse stellar disks. They are metal poor and have a lower star formation rate than other spirals. However many LSB galaxies do show significant AGN activity. We have detected and mapped molecular gas in 2 nearby LSB spiral galaxies, UGC6614 and F568-6 (Malin 2). We have used the BIMA interferometer and IRAM telescope for these observations. In both galaxies the gas was detected in the disk and in F568-6 it was extended over the inner disk as well. This is the first time molecular gas has been detected in an LSB galaxy that is clearly associated with the disk. We have also detected millimetre continuum emission from one galaxy in our sample, UGC6614. The emission is from the AGN and has a flat spectrum. Using the GMRT we have mapped the HI distribution in several LSB galaxies such as the LSB 1300+0144. The HI disk in this galaxy is very massive and extends well beyond the optical disk. We have also mapped the centimetre radio continuum emission from a sample of giant LSB galaxies; the emission is from the AGN . In the LSB galaxy 1300+0144 we find that the emission is extended in lobes about the nucleus. Such features have not been seen before in LSB galaxies. The synchrotron energy in the lobes is large and comparable to that observed in the lobes of FRI radio galaxies. Our observations thus show that LSB galaxies may have significant amounts of molecular gas in their disks as well as HI gas. Although they appear less evolved than regular spirals, they harbour radio bright AGN that may be active even at millimetre wavelengths.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
Alternative Location: 10.1017/S1743921306005254
Copyright: 2007, International Astronomical Union
Appears in Collections:Research Papers (A&A)

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