15-20 March 2020
Garching
Europe/Berlin timezone

eROSITA discovery of a new AGN state in 1H0707-495

17 Mar 2020, 17:45
15m
Garching

Garching

Speaker

Prof. Thomas Boller (MPE)

Description

One of the most prominent AGNs, the ultrasoft Narrow-Line Seyfert 1 Galaxy 1H0707-495, has been observed with eROSITA as one of the first CAL/PV observations on October 13, 2019 for about 60.000 seconds. 1H 0707-495 is a highly variable AGN, with a complex, steep X-ray spectrum, which has been the subject of intense study with XMM-Newton in the past. 1H0707-495 entered an historical low hard flux state, first detected with eROSITA, never seen before in the 20 years of XMM-Newton observations. In addition ultra-soft emission with a variability factor of about 100 has been detected for the first time in the eROSITA light curves. We discuss fast spectral transitions between the cool and a hot phase of the accretion flow in the very strong GR regime as a physical model for 1H0707-495, and provide tests on previously discussed models.

Presenter status Senior eROSITA consortium member

Primary authors

Prof. Thomas Boller (MPE) Prof. Kirpal Nandra (MPE Garching) Dr Teng Liu (MPE Garching) Andrea Merloni Dr Thomas Dauser (FAU Nürnberg) Dr Arne Rau (MPE Garching) Dr Johannes Buchner (MPE) Dr Michael Freyberg (MPE)

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