Cited by 79Astrophysical Phenomena and ObservationsAstrophysics and Star Formation StudiesGalaxies: Formation, Evolution, Phenomena

Blowing in the Milky Way Wind: Neutral Hydrogen Clouds Tracing the Galactic Nuclear Outflow

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Di Teodoro, Enrico M., McClure-Griffiths, N. M., Lockman, Felix J., Denbo, Sara R., Endsley, Ryan, Ford, H. Alyson, Harrington, Kevin·2018·The Astrophysical Journal

Abstract

We present the results of a new sensitive survey of neutral hydrogen above and below the Galactic Center with the Green Bank Telescope. The observations extend up to Galactic latitude with an effective angular resolution of 9.′5 and an average rms brightness temperature noise of 40 mK in a 1 channel. The survey reveals the existence of a population of anomalous high-velocity clouds extending up to heights of about 1.5 kpc from the Galactic plane and showing no signature of Galactic rotation. These clouds have local standard of rest velocities , and assuming a Galactic Center origin, they have sizes of a few tens of parsec and neutral hydrogen masses spanning . Accounting for selection effects, the cloud population is symmetric in longitude, latitude, and V LSR . We model the cloud kinematics in terms of an outflow expanding from the Galactic Center and find the population consistent with being material moving with radial velocity distributed throughout a bicone with opening angle . This simple model implies an outflow luminosity erg s −1 over the past 10 Myr, consistent with star formation feedback in the inner region of the Milky Way, with a cold gas mass-loss rate . These clouds may represent the cold gas component accelerated in the nuclear wind driven by our Galaxy, although some of the derived properties challenge current theoretical models of the entrainment process.

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Research works printed but not linked: 2

  1. Rougoor, G. W., & Oort, J. H. 1959, in IAU Symp. 9, URSI Symp. 1: Paris Symposium on Radio Astronomy, ed. R. N. Bracewell (Stanford, CA: Stanford University Press), 416
  2. Sault, R. J., Teuben, P. J., & Wright, M. C. H. 1995, in ASP Conf. Ser. 77, Astronomical Data Analysis Software and Systems IV, ed. R. A. Shaw, H. E. Payne, & J. J. E. Hayes (San Francisco, CA: ASP), 433

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Authors
Di Teodoro, E. M., McClure-Griffiths, N. M., Lockman, F. J., Denbo, S. R., Endsley, R., Ford, H. A., & Harrington, K.
Affiliations
  • Michigan State University (US)
  • University of Arizona (US)
  • University of Bonn (DE)
Venue
The Astrophysical Journal
Published
2018-03-01
Volume
855
Issue
1
Pages
33
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
OpenAlex
W2786236033
Cited by
79
References
86
Citations by year
2026: 5 · 2025: 7 · 2024: 9 · 2023: 13 · 2022: 8 · 2021: 14 · 2020: 11 · 2019: 9 · 2018: 3
FWCI
4.96
Type
journal article
Language
en
Open access
Locations
  • The Astrophysical Journal (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • ANU Open Research (Australian National University) (submittedVersion)
  • Florence Research (University of Florence) (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 › Astrophysics and Star Formation Studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
Keywords
high-velocity clouds, neutral hydrogen clouds, Galactic Center, stellar feedback, entrainment

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