Skip to main content Accessibility help
×
Home

The High-Velocity Clouds: Galactic or Extragalactic?

  • Hugo van Woerden (a1), Bart P. Wakker (a2), Ulrich J. Schwarz (a1), Reynier F. Peletier (a1) and Peter M.W. Kalberla (a3)...

Abstract

We present firm evidence that one of the major high velocity clouds (HVCs), Complex A, lies in the Milky Way Halo, at a vertical distance z = 3 - 7 kpc from the Galactic plane. For clouds MII/MIII, Danly et al. and Keenan et al. had already found z < 5 kpc. We further report that the metallicity in the largest HVC, Complex C, is at least 0.1 solar. Call/Hi ratios in 6 HVCs, ranging from 0.002 to 0.07 times solar, set lower limits to their metallicities.

Blitz et al. have recently suggested that most of the HVCs are relatively unprocessed, extragalactic remnants of the gas which formed the Local Group of galaxies. However, the results mentioned above indicate that several major HVC complexes are neither primordial nor extragalactic. For the smaller HVCs, some of which have much higher velocities, a location in the Local Group remains a possibility.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      The High-Velocity Clouds: Galactic or Extragalactic?
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      The High-Velocity Clouds: Galactic or Extragalactic?
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      The High-Velocity Clouds: Galactic or Extragalactic?
      Available formats
      ×

Copyright

References

Hide All
Blitz, L., Spergel, D.N., Teuben, P.J., Hartmann, L., & Burton, W.B. (1997): BAAS 28, 1349.
Danly, L., Albert, C.E., & Kuntz, K.D. (1993): ApJ 416, L29.
Houck, J.C., & Bregman, J.N. (1990): ApJ 352, 506.
Keenan, F.P., Shaw, C.R., Bates, B., Dufton, P.L., & Kemp, S.N. (1995): MNRAS 272, 599.
Schwarz, U.J., Wakker, B.P., & van Woerden, H. (1995): A&A 302, 364
Wakker, B.P., & Schwarz, U.J. (1991): A&A 250, 484.
Wakker, B.P., & van Woerden, H. (1997): ARA&A 35, in press.
Wakker, B.P., Howk, C., Schwarz, U.J., van Woerden, H., Beers, T.O., Wilhelm, R., Kalberla, P.M.W., & Danly, L. (1996a): ApJ 473, 834.
Wakker, B.P., van Woerden, H., Schwarz, U.J., Peletier, R.F., & Douglas, N.G. (1996b): A&A 306, L25.
Wakker, B.P., van Woerden, H., de Boer, K.S., & Kalberla, P.M.W. (1997): ApJ, submitted.

The High-Velocity Clouds: Galactic or Extragalactic?

  • Hugo van Woerden (a1), Bart P. Wakker (a2), Ulrich J. Schwarz (a1), Reynier F. Peletier (a1) and Peter M.W. Kalberla (a3)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed