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Multiwavelength features of Fermi bubbles as signatures of a Galactic wind

Sarkar, Kartick Chandra and Nath, Biman B and Sharma, Prateek (2015) Multiwavelength features of Fermi bubbles as signatures of a Galactic wind. In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 453 (4). pp. 3827-3838.

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Official URL: http://dx.doi.org/10.1093/mnras/stv1806

Abstract

Using hydrodynamical simulations, we show for the first time that an episode of star formation in the centre of the Milky Way, with a star formation rate (SFR) similar to 0.5 M-circle dot yr(-1) for similar to 30 Myr, can produce bubbles that resemble the Fermi bubbles (FBs), when viewed from the solar position. The morphology, extent and multiwavelength observations of FBs, especially X-rays, constrain various physical parameters such as SFR, age, and the circumgalactic medium (CGM) density. We show that the interaction of the CGM with the Galactic wind driven by star formation in the central region can explain the observed surface brightness and morphological features of X-rays associated with the FBs. Furthermore, assuming that cosmic ray electrons are accelerated in situ by shocks and/or turbulence, the brightness and morphology of gamma-ray emission and the microwave haze can be explained. The kinematics of the cold and warm clumps in our model also matches with recent observations of absorption lines through the bubbles.

Item Type: Journal Article
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Additional Information: Copy right for this article belongs to the OXFORD UNIV PRESS, GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
Keywords: ISM: jets and outflows; Galaxy: centre; Galaxy: halo; galaxies: star formation
Department/Centre: Division of Physical & Mathematical Sciences > Joint Astronomy Programme
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 24 Nov 2015 06:01
Last Modified: 24 Nov 2015 06:01
URI: http://eprints.iisc.ernet.in/id/eprint/52802

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