Skip to main content Accessibility help
×
Home

Tracing Small-Scale Fluctuations in the Soft X-ray Background

  • R. Warwick (a1), I. Hutchinson (a1), R. Willingale (a1), K. Kuntz (a2) and S. Snowden (a3)...

Abstract

An overlapping set of ROSAT PSPC observations made in a region of very low Galactic foreground column density, has been used to investigate variations in the soft X-ray background on angular scales of 15′ – 5°. In the ¼ keV band there is a clear inverse correlation of the count-rate with the line-of-sight hydrogen column density. However, after correcting for this absorption effect, strong residual fluctuations remain in the data, with an amplitude which is significantly larger than that due to the counting statistics or the confusion of unresolved discrete sources. In contrast a similar analysis for the ¾ and 1.5 keV ROSAT bands shows no evidence for an excess signal. The most likely origin of the ¼ keV fluctuations would seem to be in a patchy distribution of ~ 106 K gas in the Galactic halo.

    • 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.

      Tracing Small-Scale Fluctuations in the Soft X-ray Background
      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.

      Tracing Small-Scale Fluctuations in the Soft X-ray Background
      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.

      Tracing Small-Scale Fluctuations in the Soft X-ray Background
      Available formats
      ×

Copyright

References

Hide All
Barber, C.R., Warwick, R.S., Snowden, S.L. (1996): MPE Report 263, 319
Burrows, D.N., Mendenhall, J.A. (1991): Nature, 351, 629
Carrera, F.J., Fabian, A.C., Barcone, X. (1997): MNRAS, 285, 820
Hasinger, G., et al. (1993): A&A, 275, 1
Kahn, F.D. (1997): these proceedings
Kuntz, K.D., Snowden, S.L., Warwick, R.S. (1997): these proceedings
Snowden, S.L. et al. (1991): Science, 252, 1529
Snowden, S.L. et al. (1994): ApJ, 430, 601
Snowden, S.L. (1995): Cookbook for Analysis Procdures for ROSAT XRT/PSPC Observations of Extended Objects and the Diffuse Background
Snowden, S.L. (1997): these proceedings
Soltan, A., Hasinger, G., Egger, R., Snowden, S., & Trümper, J. (1996): A&A, 305, 17
Wang, Q.D., Yu, K.C. (1995): AJ, 109, 698

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