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28 March 2024 |
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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 | Abstract: | The 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 | Services: | Forum | Review | PDF | Favorites |
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