The Molecular Counterpart of the Galactic Center Arched Filament HII Complex: OVRO Observations of the CS(2-1) Line

Cornelia C Lang; W. M Goss; Mark Morris

doi:10.1086/344159

Back

The Molecular Counterpart of the Galactic Center Arched Filament HII Complex: OVRO Observations of the CS(2-1) Line

Journal article

Open access

Peer reviewed

The Molecular Counterpart of the Galactic Center Arched Filament HII Complex: OVRO Observations of the CS(2-1) Line

Cornelia C Lang, W. M Goss and Mark Morris

The Astronomical journal, Vol.124, pp.2677-2692

11/2002

DOI: 10.1086/344159

Files and links (1)

url

https://doi.org/10.1086/344159View

Published (Version of record) Open Access

Abstract

The Owens Valley Radio Observatory (OVRO) millimeter array was used to make observations of the CS(2-1) line (at 97.981 GHz) arising from the G0.07+0.04 region of the ``-30 km/s'' molecular cloud near the Galactic center with a spatial resolution of ~8". The ionized edges of this cloud forms the Arched Filament HII regions which are ionized by the adjacent Arches stellar cluster. The OVRO data were combined with single-dish data obtained at the 30-m IRAM telescope by Serabyn & Guesten (1987). A comparison of this CS(2-1) data and the H92alpha recombination line data of Lang, Goss & Morris (2001) reveals that the ionized and molecular gas are physically related, but that their velocities in this region differ by up to 35 km/s. This difference in velocity can be understood if the gas that gave rise to the G0.07+0.04 HII region has been fully ionized. An overall comparison of the molecular and ionized gas across the entire -30 km/s cloud based on the single dish CS(2-1) data and the H92alpha line data illustrates that such differences in velocity between the ionized and molecular gas are common and that the geometrical arrangement of these components is complicated. Much of the ionized gas resides on the near side (to the observer) of the molecular cloud; however, in several regions, some molecular material must lie in front of the HII region. The Arches stellar cluster therefore appears to be located in the midst of the molecular clouds such that some of the near-side cloud surfaces along our line of sight have not been exposed to the ionizing radiation.

Physics - Astrophysics of Galaxies

Physics - Cosmology and Nongalactic Astrophysics

Physics - Earth and Planetary Astrophysics

Physics - High Energy Astrophysical Phenomena

Physics - Instrumentation and Methods for Astrophysics

Physics - Solar and Stellar Astrophysics

Details

Title: Subtitle: The Molecular Counterpart of the Galactic Center Arched Filament HII Complex: OVRO Observations of the CS(2-1) Line
Creators: Cornelia C Lang - University of Iowa
W. M Goss - National Radio Astronomy Observatory
Mark Morris - Mathematical Sciences Research Institute
Resource Type: Journal article
Publication Details: The Astronomical journal, Vol.124, pp.2677-2692
DOI: 10.1086/344159
ISSN: 0004-6256
eISSN: 1538-3881
Publisher: American Astronomical Society
Language: English
Date published: 11/2002
Academic Unit: Liberal Arts and Science Admin; Physics and Astronomy
Record Identifier: 9984428827402771

Metrics

9 Record Views

27 Times Cited - Web of Science