New Look at the Molecular Superbubble Candidate in the Galactic Center
Abstract The l = +13 region in the Galactic center is characterized by multiple shell-like structures and their extremely broad velocity widths. We revisit the molecular superbubble hypothesis for this region, based on high-resolution maps of CO J = 1–0, 13 CO J = 1−0, H 13 CN J = 1−0, H 13 CO + J =...
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Published in | The Astrophysical journal Vol. 910; no. 1; pp. 61 - 69 |
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Main Authors | , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Philadelphia
The American Astronomical Society
01.03.2021
IOP Publishing |
Subjects | |
Online Access | Get full text |
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Summary: | Abstract
The
l
= +13 region in the Galactic center is characterized by multiple shell-like structures and their extremely broad velocity widths. We revisit the molecular superbubble hypothesis for this region, based on high-resolution maps of CO
J
= 1–0,
13
CO
J
= 1−0, H
13
CN
J
= 1−0, H
13
CO
+
J
= 1−0, SiO
J
= 2−1, and CS
J
= 2−1 lines obtained from the Nobeyama Radio Observatory 45 m telescope, as well as CO
J
= 3−2 maps obtained from the James Clerk Maxwell telescope. We identified 11 expanding shells with total kinetic energy and typical expansion time
E
kin
∼ 10
51.9
erg and
t
exp
∼ 10
4.9
yr, respectively. In addition, the
l
= +13 region exhibited high SiO
J
= 2−1/H
13
CN
J
= 1−0 and SiO
J
= 2−1/H
13
CO
+
J
= 1−0 intensity ratios, indicating that the region has experienced dissociative shocks in the past. These new findings confirm the molecular superbubble hypothesis for the
l
= +13 region. The nature of the embedded star cluster, which may have supplied 20–70 supernova explosions within 10
5
yr, is discussed. This work also shows the importance of compact broad-velocity-width features in searching for localized energy sources hidden behind severe interstellar extinction and stellar contamination. |
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Bibliography: | AAS29675 Interstellar Matter and the Local Universe |
ISSN: | 0004-637X 1538-4357 |
DOI: | 10.3847/1538-4357/abe61e |