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Near-and mid-IR colour-colour diagrams for point sources in NGC 6822. Credit: Jones et al., 2019.
Using NASA's Spitzer spacecraft, astronomers have conducted a comprehensive study of massive young stellar objects (YSOs) in the metal-poor galaxy NGC 6822. The research, detailed in a paper published September 9 on the arXiv pre-print repository, resulted in identifying hundreds of new YSOs in this galaxy.
YSOs - Stars - Stage - Evolution - Protostars
YSOs are stars in early stage of evolution, in particular, protostars and pre-main sequence stars. They are usually observed embedded in dense molecular clumps, environments containing plenty of molecular gas and interstellar dust.
Located some 1,600 light years away from the Earth, NGC 6822 is an isolated, gas-rich and metal-poor barred irregular galaxy. Taking into account the galaxy's proximity, its isolation and low metallicity, it seems to be an ideal target for studying resolved stellar populations.
Studies - Regions - NGC - Population - Scale
However, although many studies of star-forming regions in NGC 6822 have been conducted, its massive young stellar population has been more difficult to characterize on a global scale. Hence, NGC 6822 lacks global surveys of its YSOs and studies of how these objects relate to the galaxy's gas and dust distributions.
A team of astronomers led by Olivia Jones of the Royal Observatory in Edinburgh, U.K., has now investigated massive YSOs in NGC 6822. Their research is based on data collected by Spitzer's two instruments: the Infrared Array Camera (IRAC) and the Multiband Imaging Photometer for Spitzer (MIPS).
"We present a comprehensive study of massive young...
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