Giant magnetized outflows from the centre of the Milky Way

  title={Giant magnetized outflows from the centre of the Milky Way},
  author={E. Carretti and Roland M Crocker and Lister Staveley-Smith and Marijke Haverkorn and Cormac Purcell and Bryan M. Gaensler and Gianni Bernardi and Michael J. Kesteven and S. Poppi},
The nucleus of the Milky Way is known to harbour regions of intense star formation activity as well as a supermassive black hole. Recent observations have revealed regions of γ-ray emission reaching far above and below the Galactic Centre (relative to the Galactic plane), the so-called ‘Fermi bubbles’. It is uncertain whether these were generated by nuclear star formation or by quasar-like outbursts of the central black hole and no information on the structures’ magnetic field has been reported… Expand
Detection of large-scale X-ray bubbles in the Milky Way halo.
Soft-X-ray-emitting bubbles that extend approximately 14 kiloparsecs above and below the Galactic centre and include a structure in the southern sky analogous to the North Polar Spur are reported, corroborate the idea that the bubbles are not a remnant of a local supernova but part of a vast Galaxy-scale structure closely related to features seen in γ-rays. Expand
A Supernova-driven, Magnetically Collimated Outflow as the Origin of the Galactic Center Radio Bubbles
A pair of nonthermal radio bubbles recently discovered in the inner few hundred parsecs of the Galactic center bears a close spatial association with elongated, thermal X-ray features called theExpand
Inflation of 430-parsec bipolar radio bubbles in the Galactic Centre by an energetic event
Radio imaging reveals a bipolar bubble structure, with an overall span of 1 degree by 3 degrees, extending above and below the Galactic plane and apparently associated with the Galactic Centre, which is postulate to be the principal source of the relativistic particles required to power the synchrotron emission of the radio filaments within and in the vicinity of the bubble cavities. Expand
Interstellar magnetic cannon targeting the Galactic halo: A young bubble at the origin of the Ophiuchus and Lupus molecular complexes
We report the detection of a new Galactic bubble at the interface between the halo and the Galactic disc. We suggest that the nearby Lupus complex and parts of the Ophiuchus complex constitute theExpand
Probing the Fermi Bubbles in Ultraviolet Absorption: A Spectroscopic Signature of the Milky Way's Biconical Nuclear Outflow
Giant lobes of plasma extend 55 degrees above and below the Galactic Center, glowing in emission from gamma rays (the Fermi Bubbles) to microwaves (the WMAP haze) and polarized radio waves. We useExpand
There is evidence in 21 cm H i emission for voids several kiloparsecs in size centered approximately on the Galactic center, both above and below the Galactic plane. These appear to map theExpand
Fossil imprint of a powerful flare at the galactic center along the magellanic stream
The Fermi satellite discovery of the gamma-ray emitting bubbles extending 50 ◦ (10 kpc) from the Galactic center has revitalized earlier claims that our Galaxy has undergone an explosive episode inExpand
Multi-wavelength study of large-scale outflows from the Circinus galaxy
The Circinus galaxy is a composite starburst/Seyfert galaxy which exhibits radio lobes inflated by kpc scale outflows along its minor axis. Its proximity (4 Mpc) makes it a unique target to study theExpand
Multiwavelength features of Fermi bubbles as signatures of a Galactic wind
Using hydrodynamical simulations, we show that an episode of star formation in the center of the Milky Way, with a star-formation-rate (SFR) � 0.5 M⊙ yr −1 for � 30 Myr, can produce bubbles thatExpand
Chandra large-scale mapping of the Galactic Centre: probing high-energy structures around the central molecular zone
Recent observations have revealed interstellar features that apparently connect energetic activity in the central region of our Galaxy to its halo. The nature of these features, however, remainsExpand


The Milky Way's Fermi bubbles: echoes of the last quasar outburst?
Fermi-LAT has recently detected two gamma-ray bubbles disposed symmetrically with respect to the Galactic plane. The bubbles have been suggested to be in a quasi-steady state, inflated by ongoingExpand
Fermi bubbles: giant, multibillion-year-old reservoirs of Galactic center cosmic rays.
It is shown that the bubbles of emission centered on the core of the Galaxy and extending to around ± 10 kpc from the Galactic plane are naturally explained as due to a population of relic cosmic ray protons and heavier ions injected by processes associated with extremely long time scale and high areal density star formation in the Galactic center. Expand
Evidence for Gamma-ray Jets in the Milky Way
Although accretion onto supermassive black holes in other galaxies is seen to produce powerful jets in X-ray and radio, no convincing detection has ever been made of a kpc-scale jet in the Milky Way.Expand
γ-rays and the far-infrared–radio continuum correlation reveal a powerful Galactic Centre wind
We consider the thermal and non-thermal emission from the inner 200 pc of the Galaxy. The radiation from this almost star-burst-like region is ultimately driven dominantly by on-going massive starExpand
▪ Abstract The central half kiloparsec region of our Galaxy harbors a variety of phenomena unique to the central environment. This review discusses the observed structure and activity of theExpand
Non-Thermal Insights on Mass and Energy Flows Through the Galactic Centre and into the Fermi Bubbles
We construct a simple model of the star-formation- (and resultant supernova-) driven mass and energy flows through the inner ∼200 pc (in diameter) of the Galaxy. Our modelling is constrained, inExpand
Cosmic rays and the magnetic field in the nearby starburst galaxy NGC 253 III. Helical magnetic fields in the nuclear outflow
Context. Magnetic fields are good tracers of gas compression by shock w aves in the interstellar medium. These can be caused by the interaction of star-formation driven outflows from individ ual starExpand
The Nuclear Bulge of the Galaxy. III. Large-Scale Physical Characteristics of Stars and Interstellar Matter
We analyse IRAS and COBE DIRBE data at wavelengths between 2.2 and 240 of the central 500 pc of the Galaxy and derive the large-scale distribution of stars and interstellar matter in the NuclearExpand
The Galactic center (GC) lobe is a degree-tall shell of gas that spans the central degree of our Galaxy. It has been cited as evidence for a mass outflow from our GC region, which has inspiredExpand
Diffuse X-Ray Emission in a Deep Chandra Image of the Galactic Center
We examine the spectrum of diffuse emission detected in the 17' ? 17' field around Sgr A* during 625 ks of Chandra observations. The spectrum exhibits He-like and H-like lines from Si, S, Ar, Ca, andExpand