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28 March 2024
 
  » arxiv » 1511.9200

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Relativistic baryonic jets from an ultraluminous supersoft X-ray source
Ji-Feng Liu ; Yu Bai ; Song Wang ; Stephen Justham ; You-Jun Lu ; Wei-Min Gu ; Qing-Zhong Liu ; Rosanne Di Stefano ; Jin-Cheng Guo ; Antonio Cabrera-Lavers ; Pedro Alvarez ; Yi Cao ; Shri Kulkarni ;
Date 30 Nov 2015
AbstractThe formation of relativistic jets by an accreting compact object is one of the fundamental mysteries of astrophysics. While the theory is poorly understood, observations of relativistic jets from systems known as microquasarscite{Mirabel98,Paredes03} have led to a well-established phenomenologycite{Fender04,Migliari06}. Relativistic jets are not expected from sources with soft or supersoft X-ray spectra, although two such systems are known to produce relatively low-velocity bipolar outflowscite{Southwell96,Becker98}. Here we report optical spectra of an ultraluminous supersoft X-ray source (ULScite{DiStefano03,Swartz02}) in the nearby galaxy M81 (M81 ULS-1cite{Liu08a,Liu08b}) showing blueshifted broad Halpha emission lines, characteristic of baryonic jets with relativistic speeds. The time variable jets have projected velocities ~17 per cent of the speed of light, and seem similar to those in the prototype microquasar SS 433cite{Margon84,Blundell07}. Such relativistic jets are not expected to be launched from white dwarfscite{Livio01}, but an origin from a black hole or neutron star in M81 ULS-1 is hard to reconcile with its constant soft X-rayscite{Liu08b}. The completely unexpected presence of relativistic jets in a ULS challenges the canonical theories for jet formationcite{Fender04,Migliari06}, but may possibly be explained by a long speculated super-critically accreting black hole with optically thick outflows
Source arXiv, 1511.9200
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