Tag Archive for 'H1821+643'

This composite image shows the quasar H1821+643. Image credit: NASA / CXC / University of Nottingham / Russell et al. / NSF / NRAO / VLA / SAO / N. Wolk.

Astronomers Find Underachieving Quasar in Distant Galaxy Cluster

Mar 22, 2024 by News Staff

Using NASA’s Chandra X-ray Observatory and NSF’s Karl G. Jansky Very Large Array (VLA), astronomers have found that H1821+643 — the nearest quasar...

This composite image of H1821+643 contains X-rays from Chandra (blue) that have been combined with radio data from NSF’s Karl G. Jansky Very Large Array (red) and an optical image from the PanSTARRS telescope on Hawaii (white and yellow). Image credit: NASA / CXC / University of Cambridge / Sisk-Reynés et al. / NSF / NRAO / VLA / PanSTARRS.

Chandra Finds Slow-Rotating Supermassive Black Hole in Distant Quasar

Jul 1, 2022 by News Staff

A supermassive black hole in the center of H1821+643, a quasar about 3.4 billion light-years away from Earth, is rotating at about half the speed of light. This...

The main part of this graphic is from the Millenium simulation, which uses supercomputers to formulate how the key components of the Universe, including the WHIM, would have evolved over cosmic time. If these filaments exist, they could absorb certain types of light such as X-rays that pass through them. The inset in this graphic represents some of the X-ray data collected by NASA’s Chandra X-ray Observatory from a distant, rapidly-growing supermassive black hole known as a quasar. The plot is a spectrum -- the amount of X-rays over a range of wavelengths -- from a new study of the quasar H1821+643 that is located about 3.4 billion light years from Earth. Image credit: Springel et al / NASA / CXC / CfA / Kovacs et al.

Astrophysicists May Have Found Universe’s ‘Missing Mass’

Feb 18, 2019 by News Staff

About a third of the normal matter — meaning hydrogen, helium and other elements — created shortly after the Big Bang is not seen in the present-day...