RADIO RECOMBINATION LINES TOWARD THE GALACTIC CENTER LOBE

Law, C. J.; Backer, D.; Yusef-Zadeh, F.; Maddalena, R.

doi:10.1088/0004-637x/695/2/1070

Cited by 34Astrophysical Phenomena and ObservationsGalaxies: Formation, Evolution, PhenomenaAstrophysics and Star Formation Studies

RADIO RECOMBINATION LINES TOWARD THE GALACTIC CENTER LOBE

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Law, C. J., Backer, D., Yusef-Zadeh, F., Maddalena, R.·2009·The Astrophysical Journal

DOI 10.1088/0004-637x/695/2/1070

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Abstract

The Galactic center (GC) lobe is a degree-tall shell seen in radio continuum images of the GC region. If it is actually located in the GC region, formation models would require massive energy input (e.g., starburst or jet) to create it. At present, observations have not strongly constrained the location or physical conditions of the GC lobe. This paper describes the analysis of new and archival single-dish observations of radio recombination lines toward this enigmatic object. The observations find that the ionized gas has a morphology similar to the radio continuum emission, suggesting that they are associated. We study averages of several transitions from H106α to H191 and find that the line ratios are most consistent with gas in local thermodynamic equilibrium. The radio recombination line widths are remarkably narrow, constraining the typical electron temperature to be less than about 4000 K. These observations also find evidence of pressure broadening in the higher electronic states, implying a gas density of n e = 910 +310 −450 cm −3 . The electron temperature, gas pressure, and morphology are all consistent with the idea that the GC lobe is located in the GC region. If so, the ionized gas appears to form a shell surrounding the central 100 parsecs of the galaxy with a mass of roughly 10 5 M ☉ , similar to ionized outflows seen in dwarf starbursts.

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Authors: Law, C. J., Backer, D., Yusef-Zadeh, F., & Maddalena, R.
Affiliations: Northwestern University (US)
University of California, Berkeley (US)
National Radio Astronomy Observatory (US)
ORCID: Law, C. J.
Maddalena, R.
Venue: The Astrophysical Journal
Publisher: American Astronomical Society
Published: 2009-04-07
Volume: 695
Issue: 2
Pages: 1070-1081
ISSN: 0004-637X (ISSN-L)
1538-4357
DOI: 10.1088/0004-637x/695/2/1070
OpenAlex: W2135631990
Cited by: 34
References: 46
Citations by year: 2026: 1 · 2025: 1 · 2024: 4 · 2023: 1 · 2022: 3 · 2021: 4 · 2020: 2 · 2019: 4 · 2018: 1 · 2017: 1 · 2015: 3 · 2013: 2 · 2012: 3
FWCI: 1.18
Type: journal article
Language: en
Open access: bronze
doi.org
Locations: The Astrophysical Journal (publishedVersion)
UvA-DARE (University of Amsterdam) (publishedVersion)
arXiv (Cornell University) (submittedVersion)
Data Archiving and Networked Services (DANS) (submittedVersion)
arXiv (Cornell University)
Topics: Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
Keywords: radio recombination lines, ionized gas, electron temperature, electron density, line ratios, local thermodynamic equilibrium, pressure broadening, ionized outflows, Galactic Center

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RADIO RECOMBINATION LINES TOWARD THE GALACTIC CENTER LOBE

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