New Look at the Molecular Superbubble Candidate in the Galactic Center

Abstract

The $l=+1.{}^{\circ }3$ 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 {\it J}=1--0, ${}^{13}$CO {\it J}=1--0, H${}^{13}$CN {\it J}=1--0, H${}^{13}$CO${}^{+}$ {\it J}=1--0, SiO {\it J}=2--1, and CS {\it J}=2--1 lines obtained from the Nobeyama radio observatory 45-m telescope, as well as CO {\it J}=3--2 maps obtained from the James Clerk Maxwell telescope. We identified eleven expanding shells with total kinetic energy and typical expansion time $E_{\mathrm{kin}}\sim 10^{51.9}$ erg and $t_{\exp }\sim 10^{4.9}$ yr, respectively. In addition, the $l=+1.{}^{\circ }3$ region exhibited high SiO {\it J}=2--1/H${}^{13}$CN {\it J}=1--0 and SiO {\it J}=2--1/H${}^{13}$CO${}^{+}$ {\it 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 $l=+1.{}^{\circ }3$ 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 show 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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Cited by in corpus (6)

• PHANGS-JWST First Results: A statistical view on bubble evolution in NGC628
• The Atacama Cosmology Telescope: Microwave Intensity and Polarization Maps of the Galactic Center
• A wind-blown bubble in the Central Molecular Zone cloud G0.253+0.016
• Living on the edge of the Central Molecular Zone: G1.3 is the more likely candidate for gas accretion into the CMZ
• Catalog of High Velocity Dispersion Compact Clouds in the Central Molecular Zone of Our Galaxy
• Parabolic-like Trend in SiO Ratios throughout the Central Molecular Zone: Possible Signature of a Past Nuclear Activity in the Galactic Center