Regardless of the basic photographs we are able to all think about, the Milky Way is not quite the flat disc form we thought it was: a examine published on February confirmed proof of serious warping across the galaxy’s edges, and now a second examine has backed up the idea of a twisted Milky Way.
A group from the University of Warsaw in Poland has put a new three-dimensional map of our galaxy collectively, using distances between classical Cepheid variable stars as markers. These young, giant stars are 100 to 10,000 times brighter than the Sun, and that brightness permits scientists to detect them even at great distances, through interstellar dust and clouds.
Such stars additionally produce common light pulses, and the team used this variability to find out the position of 2,431 Cepheids dotted through the Milky Way.
“Our map reveals the Milky Way disk shouldn’t be flat. It’s warped and twisted,” says astrophysicist Przemek Mroz.
The analysis is indebted to the Optical Gravitational Lensing Experiment or OGLE, a telescope and astronomical project that, up to now, has more than doubled the variety of known classical Cepheids in the galaxy – akin to improving the resolution on a digital picture.
Data from OGLE was augmented with classical Cepheids noticed in the General Catalogue of Variable Stars (GCVS), the All-Sky Automated Survey (ASAS), the All-Sky Automated Survey for Supernovae (ASAS-SN), the Asteroid Terrestrial-Impact Last Alert System (ATLAS), and the Gaia Data Release 2 (Gaia DR2) catalog.