Hostname: page-component-cd9895bd7-gxg78 Total loading time: 0 Render date: 2024-12-24T15:35:35.073Z Has data issue: false hasContentIssue false
  • English
  • Français

Detection of an optical halo surrounding the spiral galaxy NGC 4565

Published online by Cambridge University Press:  14 August 2015

Dennis J. Hegyi

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

A halo surrounding the edge-on Sb giant spiral galaxy NGC 4565 has been detected in the spectral band 3800–8600 A using a new photometric instrument, an annular scanning photometer. the halo is brightest close to the galactic nucleus and decreases in brightness until it reaches a level of 1 part in 1000 of the sky at a galactic radius of 6.1 arc minutes or 43 kpc from the galactic center. Because the scan path of the ASP is circular, this point corresponds to a distance of 34 kpc from the galactic plane. For comparison, the Holmberg radius of NGC 4565 is equal to 7 arc minutes or 50 kpc. Preliminary V-I photometric data indicate that the halo becomes redder with increasing galactic radius, exceeding V-I = 1.9. Based on a variety of possible origins for the light, it is concluded that the light is due to stars.

Type
I. Galaxies in Small Groups
Information
Symposium - International Astronomical Union , Volume 79: The Large Scale Structure of the Universe , 1978 , pp. 95 - 96
Copyright
Copyright © Reidel 1978 

References

Einasto, J., Kaasik, A. and Saar, E., 1974. Nature, 250, 309.CrossRefGoogle Scholar
Krumm, N. and Salpeter, E.E., 1977. Astron. and Astrophys., 56, 465.Google Scholar
Ostriker, J.P., Peebles, P.J.E. and Yahil, A., 1974. Ap. J. (Letters) 193, L1.Google Scholar