X-ray detection of a nova in the fireball phase

Article Astronomy & Astrophysics

Simulation-based spectral analysis of X-ray CCD data affected by photon pile-up

Tsubasa Tamba et al.

Summary: A simulation-based method of spectral analysis has been developed for pile-up-affected data of X-ray CCDs. The method accurately corrects pile-up effects and is applicable to different types of CCDs.

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN (2022)

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Article Astronomy & Astrophysics

The eROSITA X-ray telescope on SRG

P. Predehl et al.

Summary: eROSITA is the primary instrument on the SRG mission, conducting a comprehensive all-sky survey to study the large-scale structure of the universe, including galaxy clusters and Dark Energy. The survey is expected to revolutionize our understanding of the evolution of supermassive black holes and provide new insights into various astrophysical phenomena. Early observations confirm that the instrument's performance meets its scientific promise.

ASTRONOMY & ASTROPHYSICS (2021)

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Article Astronomy & Astrophysics

A Population of Heavily Reddened, Optically Missed Novae from Palomar Gattini-IR: Constraints on the Galactic Nova Rate

Kishalay De et al.

Summary: The nova rate in the Milky Way remains uncertain but important for constraining models of Galactic chemical evolution and understanding Type Ia supernova progenitors. Previous estimates based on optical novae or nearby galaxies have been inconsistent with total discovery rates, while a near-infrared survey suggests a higher rate of approximately 43.7(-8.7)(+19.5) per year. This discrepancy indicates that a large population of highly obscured novae may have been missed in optical searches, highlighting the potential of near-infrared time-domain surveys for uncovering Galactic novae.

ASTROPHYSICAL JOURNAL (2021)

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Review Astronomy & Astrophysics

New Insights into Classical Novae

Laura Chomiuk et al.

Summary: Classical novae are nonterminal, thermonuclear eruptions on white dwarfs in binary systems. The recent discovery of GeV gamma rays from Galactic novae has shown the complexity of novae and their importance as laboratories for studying shocks and particle acceleration. The mass ejection processes of novae are poorly understood, leading to the production of gamma-ray-producing shocks internal to the nova ejecta which significantly contribute to the bolometric luminosity of novae.

ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, VOL 59 (2021)

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Article Astronomy & Astrophysics

SRG X-ray orbital observatory Its telescopes and first scientific results

R. Sunyaev et al.

Summary: The orbital observatory Spectrum-Roentgen-Gamma (SRG), equipped with the eROSITA and ART-XC X-ray telescopes, was launched to the Lagrange L2 point of the Sun-Earth system to scan the celestial sphere and obtain X-ray maps of the entire sky at different energy ranges. By completing six-month all-sky surveys and planning to obtain eight independent maps in each energy range, the observatory aims to reveal millions of quasars, galaxy clusters, and stars with hot coronae. The availability of these maps allows for long-term monitoring of extragalactic and Galactic X-ray sources, contributing to significant advancements in astronomy.

ASTRONOMY & ASTROPHYSICS (2021)

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Article Astronomy & Astrophysics