GSH 006-15+7: A local Galactic supershell featuring transition from Hi emission to absorption

V. A. Moss; N. M. Mcclure-Griffiths; R. Braun; A. S. Hill; G. J. Madsen

doi:10.1111/j.1365-2966.2012.20538.x

GSH 006-15+7: A local Galactic supershell featuring transition from Hi emission to absorption

V. A. Moss^*, N. M. Mcclure-Griffiths, R. Braun, A. S. Hill, G. J. Madsen

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

We report on the discovery of a new Galactic supershell, GSH 006-15+7, from the Galactic All-Sky Survey data. Observed and derived properties are presented, and we find that GSH 006-15+7 is one of the nearest physically large supershells known, with dimensions of ∼780 × 520pc at a distance of ∼ 1.5kpc. The shell wall appears in Hi emission at b≲-65 and in Hi self-absorption (HiSA) at b≳-65. We use this feature along with HiSA diagnostics to estimate an optical depth of τ∼ 3, a spin temperature of ∼40K and a swept-up mass of M∼ 3 × 10 ⁶M _⊙. We also investigate the origin of GSH 006-15+7, assessing the energy contribution of candidate powering sources and finding evidence in favour of a formation energy of ∼10 ⁵² erg. We find that this structure provides evidence for the transfer of mass and energy from the Galactic disc into the halo.

Original language	English
Pages (from-to)	3159-3169
Number of pages	11
Journal	Monthly Notices of the Royal Astronomical Society
Volume	421
Issue number	4
DOIs	https://doi.org/10.1111/j.1365-2966.2012.20538.x
Publication status	Published - Apr 2012
Externally published	Yes

Access to Document

10.1111/j.1365-2966.2012.20538.x

Cite this

@article{3f34825641894502a4ca6cd52b6d75c3,

title = "GSH 006-15+7: A local Galactic supershell featuring transition from Hi emission to absorption",

abstract = "We report on the discovery of a new Galactic supershell, GSH 006-15+7, from the Galactic All-Sky Survey data. Observed and derived properties are presented, and we find that GSH 006-15+7 is one of the nearest physically large supershells known, with dimensions of ∼780 × 520pc at a distance of ∼ 1.5kpc. The shell wall appears in Hi emission at b≲-65 and in Hi self-absorption (HiSA) at b≳-65. We use this feature along with HiSA diagnostics to estimate an optical depth of τ∼ 3, a spin temperature of ∼40K and a swept-up mass of M∼ 3 × 10 6M ⊙. We also investigate the origin of GSH 006-15+7, assessing the energy contribution of candidate powering sources and finding evidence in favour of a formation energy of ∼10 52 erg. We find that this structure provides evidence for the transfer of mass and energy from the Galactic disc into the halo.",

keywords = "Galaxy: structure, ISM: bubbles, ISM: structure, Radiative transfer, Radio lines: ISM, Stars: winds, outflows",

author = "Moss, {V. A.} and Mcclure-Griffiths, {N. M.} and R. Braun and Hill, {A. S.} and Madsen, {G. J.}",

year = "2012",

month = apr,

doi = "10.1111/j.1365-2966.2012.20538.x",

language = "English",

volume = "421",

pages = "3159--3169",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press ",

number = "4",

}

TY - JOUR

T1 - GSH 006-15+7

T2 - A local Galactic supershell featuring transition from Hi emission to absorption

AU - Moss, V. A.

AU - Mcclure-Griffiths, N. M.

AU - Braun, R.

AU - Hill, A. S.

AU - Madsen, G. J.

PY - 2012/4

Y1 - 2012/4

N2 - We report on the discovery of a new Galactic supershell, GSH 006-15+7, from the Galactic All-Sky Survey data. Observed and derived properties are presented, and we find that GSH 006-15+7 is one of the nearest physically large supershells known, with dimensions of ∼780 × 520pc at a distance of ∼ 1.5kpc. The shell wall appears in Hi emission at b≲-65 and in Hi self-absorption (HiSA) at b≳-65. We use this feature along with HiSA diagnostics to estimate an optical depth of τ∼ 3, a spin temperature of ∼40K and a swept-up mass of M∼ 3 × 10 6M ⊙. We also investigate the origin of GSH 006-15+7, assessing the energy contribution of candidate powering sources and finding evidence in favour of a formation energy of ∼10 52 erg. We find that this structure provides evidence for the transfer of mass and energy from the Galactic disc into the halo.

AB - We report on the discovery of a new Galactic supershell, GSH 006-15+7, from the Galactic All-Sky Survey data. Observed and derived properties are presented, and we find that GSH 006-15+7 is one of the nearest physically large supershells known, with dimensions of ∼780 × 520pc at a distance of ∼ 1.5kpc. The shell wall appears in Hi emission at b≲-65 and in Hi self-absorption (HiSA) at b≳-65. We use this feature along with HiSA diagnostics to estimate an optical depth of τ∼ 3, a spin temperature of ∼40K and a swept-up mass of M∼ 3 × 10 6M ⊙. We also investigate the origin of GSH 006-15+7, assessing the energy contribution of candidate powering sources and finding evidence in favour of a formation energy of ∼10 52 erg. We find that this structure provides evidence for the transfer of mass and energy from the Galactic disc into the halo.

KW - Galaxy: structure

KW - ISM: bubbles

KW - ISM: structure

KW - Radiative transfer

KW - Radio lines: ISM

KW - Stars: winds, outflows

UR - http://www.scopus.com/inward/record.url?scp=84859563155&partnerID=8YFLogxK

U2 - 10.1111/j.1365-2966.2012.20538.x

DO - 10.1111/j.1365-2966.2012.20538.x

M3 - Article

SN - 0035-8711

VL - 421

SP - 3159

EP - 3169

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

GSH 006-15+7: A local Galactic supershell featuring transition from Hi emission to absorption

Abstract

Access to Document

Other files and links

Fingerprint

Cite this