Featured Science

World's Largest N-body Simulation "TianNu" Discovers the Differential Neutrino Condensation Effect

KIAA postdoc fellow Hao-Ran Yu and his research team completed the World’s largest N-body simulation “TianNu” on the Chinese Tianhe-2 supercomputer. This 3 trillion particle N-body simulation coevolve the cold dark matter and neutrino fluids throughout the cosmic evolution, and discovered the differential neutrino condensation effect, which opens the path to an independent cosmological measurement of neutrino masses.

International Team Completes Large Survey of Gas in Nearby Galaxies

The team, comprising investigators from Italy, the UK, China, Germany, Chile and have completed a large survey of molecular gas in nearby galaxies using the 12m APEX telescope in Chile. The APEX Low-redshift Legacy Survey of MOlecular Gas (ALLSMOG) has observed the Carbon Monoxide (CO) molecule in a sample of 97 galaxies in the local Universe. The ALLSMOG data provide important information on the cold molecular gas content of these galaxies which have been well characterized in terms of their star-formation rates, gas-phase metallicities and atomic HI gas masses.

Merging Galaxies Have Enshrouded Black Holes

An international team of astronomers from China and Chile use NASA's NuSTAR telescope to observe the penetrating high-energy X-ray emission from 52 galaxies. They find that in the late stages of galaxy mergers, so much gas and dust falls toward a black hole that the extremely bright AGN is enshrouded. This study helps confirm the longstanding idea that an AGN's black hole does most of its eating while enshrouded during the late stages of a merger.

New Discoveries Fill the Gap of Quasar Color Selection

A team at KIAA carried out the first systematic z ~ 5.5 quasar survey. It has been very challenging to select quasars at redshift z ~ 5.5 using conventional color selections, due to their similar optical colors to late-type stars, especially M dwarfs, resulting in a glaring quasar redshift gap around z~ 5.5. Their survey based on a new selection pipeline using optical, near-infrared and mid-infrared colors is effectively filling the redshift gap with 18 newly discovered quasars at z~5.5.

The Influence of Environment on the Chemical Evolution of Low-mass Galaxies

Astronomers from KIAA at PKU have found a mass dependent star formation timescale of early-type galaxies (ETGs) across a wide mass range. The low mass ETGs depart from this standard relation in extreme environments, suggesting earlier quenching in very dense environments and more extended star formation histories in low-density environments.

Revealing the Orbital Shape Distributions of Exoplanets with China’s LAMOST Telescope

Using data from China’s LAMOST telescope, a team of astronomers have derived how the orbital shapes distribute for extrasolar planets. The work is recently published in the journal “Proceedings of the National Academy of Sciences of the United States of America” (PNAS). The lead authors are Prof. Jiwei Xie from Nanjing University and KIAA faculty member Prof. Subo Dong.