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3rd of May 2019
HIPASS galaxies with low star formation
(by Parkash et al.)
Parkash et al. have examined a sample of 91 galaxies, selected from the HI Parkes All-Sky Survey (HIPASS), that infrared observations suggest have little or no star formation. Inspection of optical images of 62 of the galaxies revealed that at least 32 galaxies in the sample have low levels of star formation, primarily in arms/rings. From a spectroscopic analysis of HI selected galaxies with little star formation, they conclude that 75% of this population have low-ionisation nuclear emission-line regions (LINERs) or extended low-ionisation emission-line regions (LIERs). The images above are from the Carnegie Irvine Galaxy Survey (CGS). The bottom left of each postage stamp includes notes on the optical features of the galaxy: bars (B), rings (R), star formation in the outer region (SF), edge-on (EO) and dust lanes (DL). Full results are published in the paper published in Monthly Notices of the Royal Astronomical Society.

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