2019A&A...631A..52J


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET19:29:59

2019A&A...631A..52J - Astronomy and Astrophysics, volume 631A, 52-52 (2019/11-1)

Gas shells and magnetic fields in the Orion-Eridanus superbubble.

JOUBAUD T., GRENIER I.A., BALLET J. and SOLER J.D.

Abstract (from CDS):


Aims. The Orion-Eridanus superbubble has been blown by supernovae and supersonic winds of the massive stars in the Orion OB associations.It is the nearest site at which stellar feedback on the interstellar medium that surrounds young massive clusters can be studied. The formation history and current structure of the superbubble are still poorly understood, however.It has been pointed out that the picture of a single expanding object should be replaced by a combination of nested shells that are superimposed along the line of sight. We have investigated the composite structure of the Eridanus side of the superbubble in the light of a new decomposition of the atomic and molecular gas.
Methods. We used HI 21 cm and CO (J=1-0) emission lines to separate coherent gas shells in space and velocity, and we studied their relation to the warm ionised gas probed in Hα emission, the hot plasma emitting X-rays, and the magnetic fields traced by dust polarised emission. We also constrained the relative distances to the clouds using dust reddening maps and X-ray absorption. We applied the Davis-Chandrasekhar-Fermi method to the dust polarisation data to estimate the plane-of-sky components of the magnetic field in several clouds and along the outer rim of the superbubble.
Results. Our gas decomposition has revealed several shells inside the superbubble that span distances from about 150-250pc. One of these shells forms a nearly complete ring filled with hot plasma. Other shells likely correspond to the layers of swept-up gas that is compressed behind the expanding outer shock wave. We used the gas and magnetic field data downstream of the shock to derive the shock expansion velocity, which is close to ∼20km/s. Taking the X-ray absorption by the gas into account, we find that the hot plasma inside the superbubble is over-pressured compared to plasma in the Local Bubble. The plasma comprises a mix of hotter and cooler gas along the lines of sight, with temperatures of (3-9) and (0.3-1.2)x106K, respectively. The magnetic field along the western and southern rims and in the approaching wall of the superbubble appears to be shaped and compressed by the ongoing expansion. We find plane-of-sky magnetic field strengths from 3 to 15µG along the rim.

Abstract Copyright: © T. Joubaud et al. 2019

Journal keyword(s): ISM: clouds - ISM: bubbles - ISM: magnetic fields - solar neighborhood - local insterstellar matter

Simbad objects: 33

goto Full paper

goto View the reference in ADS

Number of rows : 33

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Cetus Field reg 02 05 20 -04 55.0           ~ 25 0
2 NAME Eridanus Shell sh 02 17 31 +07 49.6           ~ 45 0
3 [DB2002b] G156.52-44.71 MoC 02 26.2 +11 53           ~ 10 0
4 [DB2002b] G157.98-35.06 MoC 02 51 07.7 +19 32 20           ~ 16 0
5 MBM 12 MoC 02 56 50 +19 32.0           ~ 211 1
6 [DB2002b] G161.59-35.89 MoC 02 59.4 +17 12           ~ 11 0
7 [DB2002b] G162.45-31.87 MoC 03 11.9 +20 01           ~ 11 0
8 MBM 15 MoC 03 12.6 -09 24           ~ 9 0
9 MBM 16 MoC 03 19 04.1 +11 34 52           ~ 57 0
10 [DB2002b] G167.53-26.61 MoC 03 40.8 +21 15           ~ 10 0
11 NAME Eri Bubble HI 03 52 -02.0           ~ 83 0
12 NAME Eri Region reg 04 00 -20.0           ~ 38 0
13 LDN 1569 MoC 04 02.4 +01 18           ~ 45 0
14 MBM 106 MoC 04 22.6 +19 32           ~ 4 0
15 MBM 107 MoC 04 27.4 +18 52           ~ 3 0
16 MBM 108 MoC 04 28.9 +18 27           ~ 2 0
17 MBM 109 MoC 04 31.4 +18 06           ~ 2 0
18 LDN 1642 MoC 04 35 18 -14 13.9           ~ 136 0
19 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3372 0
20 PSR B0450-18 Psr 04 52 34.0979 -17 59 23.450           ~ 163 0
21 PSR J0459-0210 Psr 04 59 51.941 -02 10 06.60   11.0 10.36     ~ 27 0
22 MBM 22 MoC 05 04 36.3 -08 15 55           ~ 15 0
23 NAME Barnard's Loop HII 05 27.5 -03 58           ~ 102 1
24 NAME lam Ori Cloud Cld 05 35 06 +09 56.0           ~ 31 0
25 M 42 HII 05 35 17.3 -05 23 28           ~ 3684 0
26 GSH 206-17+13 sh 05 37 -02.1           ~ 6 0
27 NAME Ori I As* 05 38 -02.8           ~ 550 0
28 NAME Ori A MoC 05 38 -07.1           ~ 2638 0
29 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1142 0
30 NAME GUM Nebula ISM 07 43 -42.1           ~ 384 1
31 NAME Eri Loop reg ~ ~           ~ 12 0
32 NAME Local Bubble ISM ~ ~           ~ 681 0
33 GAL 203-37 reg ~ ~           ~ 3 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2019A&A...631A..52J and select 'bookmark this link' or equivalent in the popup menu


2020.02.17-19:29:59

© Université de Strasbourg/CNRS

    • Contact