High Energy Astrophysics and Cosmology in the era of all-sky surveys

Session

Sky surveys

15 Jun 2026, 09:10

29. From Deep to Wide: Mapping the Evolving Universe Through Extragalactic X-ray Surveys

William Brandt (Penn State University)

15/06/2026, 09:10

Extragalactic X-ray surveys have transformed our view of the high-energy universe, revealing the populations that produce the cosmic X-ray background (CXRB) and reshaping our understanding of black-hole growth and cosmic structure. I will review what X-ray surveys and their multiwavelength follow-up have uncovered about these populations over the past 27 years, drawing on results from missions...

72. SRG/eROSITA all-sky survey results in the Eastern Galactic hemisphere

Prof. Marat Gilfanov

15/06/2026, 09:40

After more than two years of scanning the sky during 2019--2022 the eROSITA X-ray telescope aboard SRG orbital observatory produced the best ever X-ray maps of the sky and discovered more than three million X-ray sources, of which about 20\% are stars with active coronas in the Milky Way, and most of the rest are galaxies with active nuclei, quasars and clusters of galaxies. eROSITA detected...

30. SRG/eROSITA results on the Western Galactic hemisphere

Dr Miriam E. Ramos-Ceja (Max Planck Institute for extraterrestrial Physics)

15/06/2026, 10:10

The eROSITA (extended ROentgen Survey with an Imaging Telescope Array) instrument aboard the Spektrum-Roentgen-Gamma (SRG) mission has significantly expanded the horizon of X-ray astronomy, delivering unprecedented legacy samples through its high sensitivity, wide field of view, and survey efficiency. These capabilities have enabled major advances in our understanding of growing supermassive...

80. Galaxy and metagalaxy in hard X-rays with the ART-XC telescope onboard SRG

Alexander Lutovinov

15/06/2026, 11:20

The Mikhail Pavlinsky ART-XC onboard the Spektr-Roentgen-Gamma (SRG) Observatory has been successfully operating in orbit since 2019. During this time, it conducted eight all sky surveys, as well as a significant number of observations of the most interesting regions and objects of the Universe. In our the overview of the ART-XC results of all sky and Milke Way surveys, particular attention...

18. The Hot Circumgalactic Medium in the eROSITA All-Sky Survey

Yi Zhang (MPA)

15/06/2026, 11:50

Studying the distribution and properties of hot gas around galaxies (hot CGM) helps constrain galaxy evolution models, but its observation is challenging. The first four SRG/eROSITA all-sky surveys (eRASS:4) allow us to detect the hot CGM by stacking a large sample of galaxies. In this talk, I will present the results we obtained: 1) X-ray surface brightness profiles and baryon budget of the...

82. SRG/eROSITA and microwave observations of clusters of galaxies - synergy and competition

Rashid Sunyaev

15/06/2026, 14:30

SRG/eROSITA and microwave observations of clusters of galaxies

44. Wide Field Survey Telescope (WFST): Overview and Recent Progress

Prof. Yongquan Xue (University of Science and Technology of China)

15/06/2026, 15:00

Wide Field Survey Telescope (WFST) is the largest time-domain survey facility in the northern hemisphere. The telescope is a dedicated photometric surveying facility being built jointly by the University of Science and Technology of China (USTC) and the Purple Mountain Observatory (PMO). It is equipped with a 2.5-meter diameter primary mirror, an active optics system, and a mosaic CCD camera...

65. The soft X-ray all-sky map observed with EP/WXT

Junjie Mao

18/06/2026, 16:35

The Einstein Probe Wide-Field X-ray Telescope (WXT), leveraging lobster-eye optics, rejuvenates the soft X-ray imaging all-sky survey. We present the first EP-WXT narrow-band maps and hardness ratio maps, where a global anti-correlation between soft X-ray and HI emission is evident. We highlight intriguing diffuse soft X-ray emission features shaping the formation and evolution of the Milky...

77. Optical follow-up of SRG /eROSITA X-ray survey by RTT-150

Prof. Ilfan Bikmaev (Academy of Sciences of Tatarstan, Kazan Federal University, Kazan, Russia)

In the report we will provide an overview of the ground based observations of SRG / eROSITA X-ray sources by using 1.5-meter RTT-150 optical telescope within the several programs of optical identifications various types of galactic and extragalactic sources. Additionally, the results of a study of the parameters of cool stars with X-ray coronal activity in the nearest open clusters...