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Cited by 61Astrophysics and Star Formation StudiesStellar, planetary, and galactic studiesGalaxies: Formation, Evolution, Phenomena

The High‐Velocity Gas toward Messier 5: Tracing Feedback Flows in the Inner Galaxy

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Zech, William F., Lehner, Nicolas, Howk, J. Christopher, Van Dyke Dixon, W., Brown, Thomas M.·2008·The Astrophysical Journal
DOI 10.1086/587135
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Abstract

We present FUSE and STIS E140M observations of the post-AGB star ZNG 1 in the globular cluster Messier 5 ( l = 3.9°, b = + 47.7°; d = 7.5 kpc , z = + 5.3 kpc ). High-velocity absorption is seen in C IV, Si IV, O VI, and lower ionization species at LSR velocities of roughly –140 and –110 km s −1 . We conclude that this gas is not circumstellar on the basis of photoionization models and path length arguments. Thus, the high-velocity gas along the ZNG 1 sight line is the first evidence that highly ionized HVCs can be found near the Galactic disk. We measure the metallicity of these HVCs to be [O/H] = + 0.22 ± 0.10, the highest of any known HVC. Given the clouds' metallicity and distance constraints, we conclude that these HVCs have a Galactic origin. This sight line probes gas toward the inner Galaxy, and we discuss the possibility that these HVCs may be related to a Galactic nuclear wind or Galactic fountain circulation in the inner regions of the Milky Way.

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  1. Asplund, M., Grevesse, N., & Sauval, A. J. 2005, in ASP Conf. Ser. 336, Cosmic Abundances as Records of Stellar Evolution and Nucleosynthesis in Honor of David L. Lambert, ed. T. G. Barnes III & F. N. Bash (San Francisco: ASP), 25
  2. Haffner, L. M. 2005, in ASP Conf. Ser. 331, Extra-Planar Gas, ed. R. Braun (San Francisco: ASP), 25
  3. Heckman, T. M. 2002, in ASP Conf. Ser. 254, Extragalactic Gas at Low Redshift, ed. J. Mulchaey & J. Stocke (San Francisco: ASP), 292
  4. Napiwotzki, R., & Heber, U. 1997, in The Third Conference on Faint Blue Stars, ed. A. G. D. Philip et al. (Schenectady: Davis), 441
  5. Richter, P. 2006, preprint (astro-ph /0602343)
  6. Strickland, D. K. 2002, in ASP Conf. Ser. 253, Chemical Enrichment of the Intracluster and Intergalactic Medium, ed. R. Fusco-Femiano & F. Matteucci (San Francisco: ASP), 387
  7. Thom, C., Peek, J. E. G., Putman, M. E., Heiles, C., Peek, K. M. G., & Wilhelm, R. 2007, ApJ, submitted (arXiv:0712.0612) · arXiv
  8. Veilleux, S. 2002, in ASP Conf. Ser. 254, Extragalactic Gas at Low Redshift, ed. J. Mulchaey & J. Stocke (San Francisco: ASP), 313
  9. Wakker, B. P., van Woerden, H., & Gibson, B. K. 1999, in ASP Conf. Ser. 166, Stromlo Workshop on High Velocity Clouds, ed. B. K. Gibson & M. E. Putman (San Francisco: ASP), 311

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Authors
Zech, W. F., Lehner, N., Howk, J. C., Van Dyke Dixon, W., & Brown, T. M.
Affiliations
  • University of Notre Dame (US)
  • Space Telescope Science Institute (US)
ORCID
Venue
The Astrophysical Journal
Publisher
American Astronomical Society
Published
2008-05-20
Volume
679
Issue
1
Pages
460-480
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
DOI
10.1086/587135
OpenAlex
W1969380877
Cited by
61
References
103
Citations by year
2026: 1 · 2025: 3 · 2024: 4 · 2023: 2 · 2022: 5 · 2021: 2 · 2020: 4 · 2019: 2 · 2018: 4 · 2017: 3 · 2016: 4 · 2015: 3 · 2014: 4 · 2013: 1 · 2012: 5
FWCI
2.68
Type
journal article
Language
en
Open access
Locations
  • The Astrophysical Journal (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • National Science Foundation (0607731)
  • National Aeronautics and Space Administration (NAS5-32985, NNX07AG93G, NAS 526555, NNG04GC44G)
  • Johns Hopkins University
  • Space Telescope Science Institute (NAS5- 26555, 26555)
  • Centre National d’Etudes Spatiales
  • Science Mission Directorate (NAS 5-26555)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
Keywords
high-velocity clouds, globular clusters, post-AGB stars, inner Galaxy, metallicity, interstellar absorption lines, photoionization models, circumstellar gas

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