activity
19952024
most citedThe Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617

1.9k citations · 10.6k across the 159 of their papers we have counts for

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Showing 2002Show all

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astro-ph2002★ 22 cited

XMM-Newton observation of PG 0844 + 349

W. Brinkmann, D. Grupe, G. Branduardi-Raymont +1

In a ~ 20 ksec XMM-Newton observation the X-ray transient radio-quiet quasar PG 0844+349 was found in a historically high state compared to previous X-ray observations. The quasar…

astro-ph2002

X-ray transient AGN and galaxies, and why we need new soft X-ray surveys

D. Grupe

X-ray transience is the most extreme form of variability observed in AGN or normal non-active galaxies. While factors of 2-3 on timescales of days to years are quite common among A…