lab snippets

Nanometer-scale phonon-plasmon coupling, solving the mystery of a dark-matter-free galaxy and finding organic molecules hiding behind interstellar dust

By 8 juin 2020 juillet 6th, 2020 No Comments

Hello LABNAUT readers,

Today we learnt about nanometre-scale phonon-plasmon coupling, that the mystery of the galaxy without dark matter has been solved and that astronomers have found a factory of organic molecules hidden behind interstellar dust.

Researchers at the LPS STEM and their colleagues say they have suceeded in observing the phonon-plasmon interaction at the nanoscale thanks to recent technological advances that have made it possible to generate electron beams nanometres in width with a very narrow spectral resolution (< 10 meV).

Source: Nanometer-scale phonon-plasmon coupling

Reference: Tailored nanoscale plasmon-enhanced vibrational electron spectroscopy. L. H. G. Tizei, V. Mkhitaryan, H. Lourenço-Martins, L. Scarabelli, K. Watanabe, T. Taniguchi, M. Tencé, J.-D. Blazit, X. Li, A. Gloter, A. Zobelli, F. Schmidt, L. M. Liz-Marzán, F. Javier García de Abajo, O. Stephan & M. Kociak. Nano Letters

According to the theory of galaxy formation, all galaxies reside in halos of dark matter. In 2018, US researchers reported on observations of a galaxy that did not seem to contain dark matter, so strongly putting the theory into doubt. An international team, involving an astrophysicist from the Laboratoire d’étude du rayonnement et de la matière en astrophysique et atmosphères (LERMA, CNRS/Observatoire de Paris-PSL/Université Cergy-Pontoise/Sorbonne University), says it has now solved the mystery surrounding this galaxy by measuring its distance. The galaxy is actually much closer than thought, and its mass is dominated by dark matter. « The current theory of galaxy formation has therefore not been disproved, « say the researchers.

Source: INSU

Reference: A distance of 13 Mpc resolves the claimed anomalies of the galaxy lacking dark matter. Ignacio Trujillo et al. Monthly Notices of the Royal Astronomical Society

Astronomers from the Institut de planétologie et d’astrophysique de Grenoble (University Grenoble Alpes / CNRS) may have solved a mystery concerning young stars that are still forming and the regions rich in organic molecules that closely surround some of them. The researchers used the Karl G. Jansky Very Large Array (VLA) of the National Science Foundation in the US to reveal one such region that had previously escaped detection.

Source: OSUG

Reference: Hot Corinos Chemical Diversity: Myth or Reality? De Simone, M., et al. Astrophysical Journal Letters

QUOTE OF THE DAY:

“It is time to flip the table over and save what can be saved”. On the occasion of World Oceans Day, the Tara Ocean Foundation is launching an exceptional communication campaign and strengthen involvement in marine microbiome research.