C.D.S. - SIMBAD4 rel 1.7 - 2021.03.07CET04:50:37

2006A&A...452L...1B - Astronomy and Astrophysics, volume 452, L1-5 (2006/6-2)

The history and future of the Local and Loop I bubbles.


Abstract (from CDS):

The Local and Loop I superbubbles are the closest and best investigated supernova (SN) generated bubbles and serve as test laboratories for observations and theories of the interstellar medium. Since the morphology and dynamical evolution of bubbles depend on the ambient density and pressure distributions, a realistic modelling of the galactic environment is crucial for a detailed comparison with observations. We have performed 3D high resolution (down to 1.25pc on a kpc-scale grid) hydrodynamic simulations of the Local Bubble (LB) and the neighbouring Loop I (L1) superbubble in a realistically evolving inhomogeneous background ISM, disturbed already by SN explosions at the Galactic rate for 200Myr before the LB and L1 are generated. The LB is the result of 19 SNe occurring in a moving group, which passed through the present day local HI cavity. We can reproduce (i) the OVI column density in absorption within the LB in agreement with Copernicus and recent fuse observations, giving NOVI<2x1013cm–2 and NOVI<7x1012cm–2, respectively; (ii) the observed sizes of the Local and Loop I superbubbles; (iii) the interaction shell between LB and L1, discovered with ROSAT; (iv) constrain the age of the LB to be 14.5±0.70.4Myr; (v) predict the merging of the two bubbles in about 3Myr, when the interaction shell starts to fragment; (vi) the generation of blobs like the Local Cloud as a consequence of a dynamical instability. We find that evolving superbubbles strongly deviate from idealised self-similar solutions due to ambient pressure and density gradients, as well as due to turbulent mixing and mass loading. Hence, at later times the hot interior can break through the surrounding shell, which may also help to explain the puzzling energy ``deficit'' observed in LMC bubbles.

Abstract Copyright:

Journal keyword(s): hydrodynamics - shock waves - ISM: general - ISM: bubbles - ISM: structure - ISM: kinematics and dynamics

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 NAME LIC Cld 04 41 +31.           ~ 253 0
2 NAME North Polar Spur ISM 12 00 +00.0           ~ 311 1
3 NAME Loop I SR? 15 01 -38.7           ~ 338 2
4 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1160 1
5 NAME Local Bubble ISM ~ ~           ~ 720 0

    Equat.    Gal    SGal    Ecl

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