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New Look at the Molecular Superbubble Candidate in the Galactic Center
Ist Teil von
The Astrophysical journal, 2021-03, Vol.910 (1), p.61
Ort / Verlag
Philadelphia: The American Astronomical Society
Erscheinungsjahr
2021
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
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.