O2 Muu julkaisu

The spherical expansion of the kilonova AT2017gfo/GW170817




TekijätSneppen Albert, Watson Darach, Bauswein Andreas, Just Oliver, Kotak Rubina, Nakar Ehud, Poznanski Dovi, Sim Stuart

Konferenssin vakiintunut nimiAmerican Astronomical Society Meetings

KustannuspaikkaAmerican Institute of Physics

Julkaisuvuosi2023

JournalBulletin of the American Astronomical Society

Tietokannassa oleva lehden nimiBulletin of the AAS

Vuosikerta55

Numero2

ISSN0002-7537

eISSN2330-9458

Verkko-osoitehttps://baas.aas.org/pub/2023n2i177p26/release/1

Rinnakkaistallenteen osoitehttps://research.utu.fi/converis/portal/detail/Publication/387035129


Tiivistelmä

X-ray polarimetry offers a unique insight into black hole X-ray binary systems that are found predominantly in the high soft (HSS) and low hard (LHS) states. The Imaging X-ray Polarimetry Explorer (IXPE) recently observed Cygnus X-1 and Cygnus X-3 in the LHS where black hole coronal emission tends to dominate. The polarization signature of this coronal Comptonized emission can be used to constrain the geometry of the corona, its viewing angle, and the origin of soft X-ray seed photons. IXPE also observed 4U1630-47 and LMC X-1 in the HSS where the polarization of thermal emission from the optically thick accretion disk can be used to rectify the degeneracies between black hole mass, spin, and inclination. We report on the physical consequences of these first IXPE observations and the science driven by this new chapter in X-ray polarimetry.


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Last updated on 2024-26-11 at 22:42