Data di Pubblicazione:
2024
Abstract:
The accretion of matter by compact objects can be inhibited by radiation pressure if the luminosity exceeds a critical value known as the Eddington limit. The discovery of ultraluminous X-ray sources has shown that accretion can proceed even when the apparent luminosity considerably exceeds this limit. A high apparent luminosity might be produced due to the geometric beaming of radiation by an outflow. The outflow half-opening angle, which determines the amplification due to beaming, has never been robustly constrained. Using the Imaging X-ray Polarimetry Explorer, we measured the X-ray polarization in the Galactic X-ray binary Cygnus X-3 (Cyg X-3). We found high, >20%, nearly energy-independent linear polarization orthogonal to the direction of the radio ejections. These properties unambiguously indicate the presence of a collimating outflow from the X-ray binary Cyg X-3 and constrain its half-opening angle to ≲15°. Thus, the source can be used as a laboratory for studying the supercritical accretion regime. This finding underscores the importance of X-ray polarimetry in advancing our understanding of accreting sources.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
Veledina A.; Muleri F.; Poutanen J.; Podgorny J.; Dovciak M.; Capitanio F.; Churazov E.; De Rosa A.; Di Marco A.; Forsblom S.V.; Kaaret P.; Krawczynski H.; La Monaca F.; Loktev V.; Lutovinov A.A.; Molkov S.V.; Mushtukov A.A.; Ratheesh A.; Rodriguez Cavero N.; Steiner J.F.; Sunyaev R.A.; Tsygankov S.S.; Weisskopf M.C.; Zdziarski A.A.; Bianchi S.; Bright J.S.; Bursov N.; Costa E.; Egron E.; Garcia J.A.; Green D.A.; Gurwell M.; Ingram A.; Kajava J.J.E.; Kale R.; Kraus A.; Malyshev D.; Marin F.; Matt G.; McCollough M.; Mereminskiy I.A.; Nizhelsky N.; Piano G.; Pilia M.; Pittori C.; Rao R.; Righini S.; Soffitta P.; Shevchenko A.; Svoboda J.; Tombesi F.; Trushkin S.A.; Tsybulev P.; Ursini F.; Wu K.; Agudo I.; Antonelli L.A.; Bachetti M.; Baldini L.; Baumgartner W.H.; Bellazzini R.; Bongiorno S.D.; Bonino R.; Brez A.; Bucciantini N.; Castellano S.; Cavazzuti E.; Chen C.-T.; Ciprini S.; Del Monte E.; Di Gesu L.; Di Lalla N.; Donnarumma I.; Doroshenko V.; Ehlert S.R.; Enoto T.; Evangelista Y.; Fabiani S.; Ferrazzoli R.; Gunji S.; Hayashida K.; Heyl J.; Iwakiri W.; Jorstad S.G.; Karas V.; Kislat F.; Kitaguchi T.; Kolodziejczak J.J.; Latronico L.; Liodakis I.; Maldera S.; Manfreda A.; Marinucci A.; Marscher A.P.; Marshall H.L.; Massaro F.; Mitsuishi I.; Mizuno T.; Negro M.; Ng C.-Y.; O'Dell S.L.; Omodei N.; Oppedisano C.; Papitto A.; Pavlov G.G.; Peirson A.L.; Perri M.; Pesce-Rollins M.; Petrucci P.-O.; Possenti A.; Puccetti S.; Ramsey B.D.; Rankin J.; Roberts O.; Romani R.W.; Sgro C.; Slane P.; Spandre G.; Swartz D.; Tamagawa T.; Tavecchio F.; Taverna R.; Tawara Y.; Tennant A.F.; Thomas N.E.; Trois A.; Turolla R.; Vink J.; Xie F.; Zane S.
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