THE CONNECTING MOLECULAR RIDGE IN THE GALACTIC CENTER

Hsieh, Pei-Ying; Ho, Paul T. P.; Hwang, Chorng-Yuan

doi:10.1088/0004-637x/811/2/142

Cited by 8Astrophysics and Star Formation StudiesAstrophysical Phenomena and ObservationsGalaxies: Formation, Evolution, Phenomena

THE CONNECTING MOLECULAR RIDGE IN THE GALACTIC CENTER

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Hsieh, Pei-Ying, Ho, Paul T. P., Hwang, Chorng-Yuan·2015·The Astrophysical Journal

DOI 10.1088/0004-637x/811/2/142

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Abstract

We report new observations of multiple transitions of the CS molecular lines in the SgrA region of the Galactic center, at an angular resolution of 40'' (=1.5 pc). The objective of this paper is to study the polar arc (PA), which is a molecular ridge near the SgrA region with apparent non-coplanar motions and a velocity gradient perpendicular to the Galactic plane. With our high resolution dense-gas maps, we search for the base and the origin of the PA, which is expected to be embedded in the Galactic disk. We find that the PA is connected to a continuous structure from one of the disk rings/arms in both the spatial and velocity domains. This structure near SgrA* has high CS( J = 4–3)/CS( J = 2–1) ratios The fact that this structure has eluded detection in previous observations is likely due to the combination of high excitation and low surface brightness temperature. We call this new structure the connecting ridge. We discuss the possible mechanism for forming this structure and for lifting the gas above the Galactic plane.

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Hsieh et al. (2015, 2016) observed an Hour-Glass shaped CS(2→1) features, each of size ~15 pc, originating from Sgr A*.
“Hsieh et al. (2015, 2016) observed an Hour-Glass shaped CS(2 → 1) features, each of size ∼ 15 pc, originating from the Sgr A ∗ .”
From The Fermi/eROSITA bubbles: a look into the nuclear outflow from the Milky Way (2024) · cites this paper as Hsieh et al. 2015
The Abstract reports CS observations near Sgr A*, and the Figure 2 caption includes a CS(J = 2–1) map. But this paper does not describe hourglass-shaped features each about 15 pc across. The Abstract instead traces the polar arc to a disk ring or arm, rather than establishing that it originates from Sgr A*. (LLM, conf=0.88)
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Self-citation

Authors: Hsieh, P.-Y., Ho, P. T. P., & Hwang, C.-Y.
Affiliations: Institute of Astronomy and Astrophysics, Academia Sinica (TW)
National Central University (TW)
Corresponding author: Hsieh, Pei-Ying
ORCID: Hsieh, Pei-Ying
Ho, Paul T. P.
Hwang, Chorng-Yuan
Venue: The Astrophysical Journal
Publisher: American Astronomical Society
Published: 2015-09-30
Volume: 811
Issue: 2
Pages: 142
ISSN: 0004-637X (ISSN-L)
1538-4357
DOI: 10.1088/0004-637x/811/2/142
OpenAlex: W2241914221
Cited by: 8
References: 89
Citations by year: 2026: 1 · 2024: 1 · 2021: 2 · 2017: 2 · 2016: 2
FWCI: 0.76
Type: journal article
Language: en
Open access: bronze
doi.org
Licence: iopscience.iop.org/info/page/text-and-data-mining (tdm)
iopscience.iop.org/page/copyright (vor)
Locations: The Astrophysical Journal (publishedVersion)
arXiv (Cornell University) (submittedVersion)
arXiv (Cornell University)
Funders: California Institute of Technology
National Science Council (NSC 100)
East Asian Core Observatories Association
Topics: Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
Keywords: Galactic Center, carbon monosulfide, dense gas, Galactic disk, velocity gradient, high excitation

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THE CONNECTING MOLECULAR RIDGE IN THE GALACTIC CENTER

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