Breaking the rules at z=0.45: the rebel case of RBS 1055
Creators
- 1. ASI – Agenzia Spaziale Italiana
- 2. INAF - Osservatorio Astronomico di Roma
- 3. Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre
- 4. ESA - European Space Research and Technology Centre (ESTEC)
- 5. INAF - Osservatorio di Astrofisica e Scienza dello Spazio
- 6. Dipartimento di Fisica e Astronomia "Augusto Righi", Università degli Studi di Bologna
Description
Very luminous quasars are unique sources for studying the circumnuclear environment around supermassive black
holes. The current paradigm for Active Galactic Nuclei (AGN) postulates the presence of several components that
contribute to the overall spectral shape in the X-rays. The hot (kTe =50-100 keV) and warm (kTe =0.1-1 keV) coronae are
responsible for the hard and soft power law continua while the circumnuclear toroidal reflector accounts for the Iron Kα α
emission line and the associated Compton hump. However, all these spectral features are simultaneously observed only
in a handful of sources above z=0.1.
We show results from a long NuSTAR observation (250 ks long) of the bright quasar RBS 1055 at z=0.45, performed on
March 2021 and from archival XMM-Newton pointings (185 ks long) taken on July 2014. An optical spectrum of the
source taken with the Double Spectrograph at the Palomar Observatory, quasi-simultaneous to the NuSTAR one, is also
analyzed.
Files
RBS1055_Marinucci.pdf
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