OVII and OVIII line emission in the diffuse soft X-ray background: heliospheric and galactic contributions

Details OVII and OVIII line emission in the diffuse soft X-ray background: heliospheric and galactic contributions OVII and OVIII line emission in the diffuse soft X-ray background: heliospheric and galactic contributions

2007-09-14

arxiv.org/abs/0709.2260v1

Astronomy and Astrophysics

Astrophysics

21 pages (3 on-line), 10 figures (4 on-line), accepted for publication in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20078271

We study the 0.57 keV (O VII triplet) and 0.65 keV (O VIII) diffuse emission generated by charge transfer collisions between solar wind (SW) oxygen ions and interstellar H and He neutral atoms in the inner Heliosphere. These lines which dominate the 0.3-1.0 keV energy interval are also produced by hot gas in the galactic halo (GH) and possibly the Local Interstellar Bubble (LB). We developed a time-dependent model of the SW Charge-Exchange (SWCX) X-ray emission, based on the localization of the SW Parker spiral at each instant. We include input SW conditions affecting three selected fields, as well as shadowing targets observed with XMM-Newton, Chandra and Suzaku and calculate X-ray emission fot O VII and O VIII lines. We determine SWCX contamination and residual emission to attribute to the galactic soft X-ray background. We obtain ground level intensities and/or simulated lightcurves for each target and compare to X-ray data. The local 3/4 keV emission (O VII and O VIII) detected in front of shadowing clouds is found to be entirely explained by the CX heliospheric emission. No emission from the LB is needed at these energies. Using the model predictions we subtract the heliospheric contribution to the measured emission and derive the halo contribution. We also correct for an error in the preliminary analysis of the Hubble Deep Field North (HDFN).

Affiliated with

Also associated with

No associations

Rating

OVII and OVIII line emission in the diffuse soft X-ray background: heliospheric and galactic contributions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with OVII and OVIII line emission in the diffuse soft X-ray background: heliospheric and galactic contributions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and OVII and OVIII line emission in the diffuse soft X-ray background: heliospheric and galactic contributions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-616327