Bengaluru: A broad new survey of our Galaxy – Bima Sakti – conducted by the international astronomer team has revealed the signature that was previously invisible with unprecedented sensitivity and details that signaled the starry and die ways, the complex processes that have stunted the people Researchers for centuries.
They also found 80 remaining supernova (SNR) in the galaxy.
The results have been published in a series of paper in astronomy & astrophysics by the team, which includes scientists from the IISC and the Institute of Space Science and Technology (IIST).
Data for the survey was collected using two strong radio telescopes: VLA Karl G Jansky array (VLA) in the National Radio Astronomy Observatory (NRAO), USA, and Radio Telescope 100-M Effelsberg Operated by the Max Planck Institute for Radio Astronomy (MPIFR) , Germany, as part of a global view of the star formation in the Milky Way project (Glostar).
According to IISC, Nirupam Roy, Assistant Professor, Physics Department, IISC and Rohit Dokara, his former student, and, Jagadheep D Pandian, Associate Professor, Iris and Space Department, Iist is among Indian scientists from Glostar.
Dokara, now pursuing a PhD in MPIFR, is the first writer in one of the papers that reports the remaining detection of supernova (SNR) – structures born from large-star explosive deaths.
“Previous surveys were only detected about a third of the expected SNR (almost 1,000).
The Glostar team has found 80 new SNR candidates in VLA data only, more expected from Effelsberg and VLA combined data,” said IISC.
The team also confirmed the presence of 77 SNR candidates previously found and reclassified several identified.
“This is an important step to resolve the long mystery lost from the remnants of the lost supernova,” Dokara said.
The Bintangresearcher formation also detects traces of other star formation: One of them, for example, is a radio emission of methanol molecules in the closest big star forming complex called Cygnus X.
It is usually emitted from big stars in the early stages of formation, IISC said, adding that the team It can also detect ionized hydrogen pockets, another sign of the presence of massive young stars “- usually surrounded by thick clouds of dust and gas.” …
because light seems absorbed in this solid cloud around the star, mostly telescopes optics don’t express much.
What people want, instead, are radio emissions, “Roy explained, who previously worked in Nrao and MPIFR.
Pandian, who previously worked in MPIFR, explained that because the Glostar survey detected various radio emissions, it was able to investigate the formation of big stars from the very beginning to a relatively late stage, which is important to get a complete picture of the star formation in the Milky Way.
Radio Telescope Effelsberg is a single large dish that stretches with a diameter of 100m, is able to detect large-scale structures, while VLA is a collection of small antennas that work Together as an interferometer to capture detail at high resolution.
Data collected from both telescopes helped the researchers painted a more comprehensive picture of the various astrophysical objects in the region, IISC said.
“This clearly shows that the Effelsberg telescope is still very important, even after 50 years of operation, “Andreas Brunt Haler MPIFR, project leader and the first author of Survey’s review of paper, said.
Karl Menten, Director, MPIFR who initiated Glostar, added: “It’s very nice to see the beautiful science produced from two of our favorite radio telescopes join.” Both Pandian and Roy currently maintain a Max Planck-India partner group with Menten to continue collaboration closely and, in particular, to expand the scope of the Glostar project.
Other members of the research team included scientists from MPIFR and NRAO, and collaborators from institutions in the UK, South Africa, Mexico, France and Australia.
With ongoing observations and analysis, more results are expected to be published from time to time, added IISC.