Search Publications

How do atomic code uncertainties affect abundance measurements in the intracluster medium?

Gu, Liyi; Mao, Junjie; Kaastra, Jelle S. +6 more

Accurate chemical abundance measurements of X‑ray‑emitting atmospheres pervading massive galaxies, galaxy groups, and clusters provide essential information on the star formation and chemical enrichment histories of these large‑scale structures. Although the collisionally ionized nature of the intracluster medium (ICM) makes these abundance measur…

Recombining plasma in supernova remnants: Discovery and progress in the last decade

Yamaguchi, Hiroya

Presence of recombining (overionized) plasma in several supernova remnants (SNRs), first suggested by ASCA observations, was anchored by the detection of enhanced radiative recombination continua in Suzaku spectra of the SNRs IC 443 and W49B. This discovery was surprising, because X‑ray‑emitting SNRs were thought to have ionizing plasmas in genera…

Smoothed particle inference analysis and abundance calculations of DEM L71, and comparison to SN explosion models

Burrows, David N.; Dwarkadas, Vikram V.; Siegel, Jared +2 more

We analyze the X‑ray emission from the supernova remnant DEM L71 using the smoothed particle inference (SPI) technique. The high Fe abundance found appears to confirm the Type Ia origin. Our method allows the separation of the material ejected in the supernova explosion from the material swept up by the supernova shock wave. We are able to calcula…

Atomic data and uncertainties with PyAtomDB

Foster, Adam R.

The Atomic Database project (AtomDB) atomic database provides access to a curated collection of atomic data, along with tools that convert this data into emissivities used in many analysis tools. We present the outline of some of the tools now available for accessing AtomDB using the new Python interface, developed to handle the larger datasets th…

Supernova remnants in nearby galaxies

Sasaki, Manami

Supernova remnants (SNRs) are the aftermath of stellar explosions, which inject large amounts of energy into the interstellar medium (ISM), carving out new structures and transferring kinetic energy to the ISM. They also act as recycling centers, which return elements processed in stars to the ISM, and cosmic particle accelerators. The evolution o…

MACHO 311.37557.169: A VY Scl star

Brown, Michael J. I.; Schwope, Axel D.; Traulsen, Iris +1 more

Optical surveys, such as the MACHO project, often uncover variable stars whose classification requires follow‑up observations by other instruments. We performed X‑ray spectroscopy and photometry of the unusual variable star MACHO 311.37557.169 with XMM‑Newton in April 2018, supplemented by archival X‑ray and optical spectrographic data. The star h…

Editor's note

Schartel, Norbert