SOLAR WIND CHARGE EXCHANGE CONTRIBUTION to the ROSAT ALL SKY SURVEY MAPS

Y. Uprety, M. Chiao, M. R. Collier, T. Cravens, Massimiliano Galeazzi, D. Koutroumpa, K. D. Kuntz, R. Lallement, S. T. Lepri, W. Liu, D. McCammon, K. Morgan, F. S. Porter, K. Prasai, S. L. Snowden, N. E. Thomas, E. Ursino, B. M. Walsh

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

DXL (Diffuse X-ray emission from the Local Galaxy) is a sounding rocket mission designed to estimate the contribution of solar wind charge eXchange (SWCX) to the diffuse X-ray background and to help determine the properties of the Local Hot Bubble. The detectors are large area thin-window proportional counters with a spectral response that is similar to that of the PSPC used in the ROSAT All Sky Survey (RASS). A direct comparison of DXL and RASS data for the same part of the sky viewed from quite different vantage points in the solar system, and the assumption of approximate isotropy for the solar wind, allowed us to quantify the SWCX contribution to all six RASS bands (R1-R7, excluding R3). We find that the SWCX contribution at l = 140°, b = 0° where the DXL path crosses the Galactic plane, is 33% ± 6% (statistical) ± 12% (systematic) for R1, 44% ± 6% ± 5% for R1, for R2, for R4, for R5, and negligible for the R6 and R7 bands. Reliable models for the distribution of neutral H and He in the solar system permit estimation of the contribution of interplanetary SWCX emission over the the whole sky and correction of the RASS maps. We find that the average SWCX contribution in the whole sky is 26% ± 6% ± 13% for R1, 30% ± 4% ± 4% for R2, 8% ± 5% ± 5% for R4, for R5, and negligible for R6 and R7.

Original languageEnglish (US)
Article number83
JournalAstrophysical Journal
Volume829
Issue number2
DOIs
StatePublished - Oct 1 2016

Fingerprint

charge exchange
solar wind
sky
solar system
sounding rockets
isotropy
proportional counters
spectral sensitivity
bubble
x rays
bubbles
galaxies
detectors
estimates

Keywords

  • ISM: individual objects (local hot bubble)
  • X-rays: diffuse background
  • X-rays: individual (SWCX)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Uprety, Y., Chiao, M., Collier, M. R., Cravens, T., Galeazzi, M., Koutroumpa, D., ... Walsh, B. M. (2016). SOLAR WIND CHARGE EXCHANGE CONTRIBUTION to the ROSAT ALL SKY SURVEY MAPS. Astrophysical Journal, 829(2), [83]. https://doi.org/10.3847/0004-637X/829/2/83

SOLAR WIND CHARGE EXCHANGE CONTRIBUTION to the ROSAT ALL SKY SURVEY MAPS. / Uprety, Y.; Chiao, M.; Collier, M. R.; Cravens, T.; Galeazzi, Massimiliano; Koutroumpa, D.; Kuntz, K. D.; Lallement, R.; Lepri, S. T.; Liu, W.; McCammon, D.; Morgan, K.; Porter, F. S.; Prasai, K.; Snowden, S. L.; Thomas, N. E.; Ursino, E.; Walsh, B. M.

In: Astrophysical Journal, Vol. 829, No. 2, 83, 01.10.2016.

Research output: Contribution to journalArticle

Uprety, Y, Chiao, M, Collier, MR, Cravens, T, Galeazzi, M, Koutroumpa, D, Kuntz, KD, Lallement, R, Lepri, ST, Liu, W, McCammon, D, Morgan, K, Porter, FS, Prasai, K, Snowden, SL, Thomas, NE, Ursino, E & Walsh, BM 2016, 'SOLAR WIND CHARGE EXCHANGE CONTRIBUTION to the ROSAT ALL SKY SURVEY MAPS', Astrophysical Journal, vol. 829, no. 2, 83. https://doi.org/10.3847/0004-637X/829/2/83
Uprety, Y. ; Chiao, M. ; Collier, M. R. ; Cravens, T. ; Galeazzi, Massimiliano ; Koutroumpa, D. ; Kuntz, K. D. ; Lallement, R. ; Lepri, S. T. ; Liu, W. ; McCammon, D. ; Morgan, K. ; Porter, F. S. ; Prasai, K. ; Snowden, S. L. ; Thomas, N. E. ; Ursino, E. ; Walsh, B. M. / SOLAR WIND CHARGE EXCHANGE CONTRIBUTION to the ROSAT ALL SKY SURVEY MAPS. In: Astrophysical Journal. 2016 ; Vol. 829, No. 2.
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abstract = "DXL (Diffuse X-ray emission from the Local Galaxy) is a sounding rocket mission designed to estimate the contribution of solar wind charge eXchange (SWCX) to the diffuse X-ray background and to help determine the properties of the Local Hot Bubble. The detectors are large area thin-window proportional counters with a spectral response that is similar to that of the PSPC used in the ROSAT All Sky Survey (RASS). A direct comparison of DXL and RASS data for the same part of the sky viewed from quite different vantage points in the solar system, and the assumption of approximate isotropy for the solar wind, allowed us to quantify the SWCX contribution to all six RASS bands (R1-R7, excluding R3). We find that the SWCX contribution at l = 140°, b = 0° where the DXL path crosses the Galactic plane, is 33{\%} ± 6{\%} (statistical) ± 12{\%} (systematic) for R1, 44{\%} ± 6{\%} ± 5{\%} for R1, for R2, for R4, for R5, and negligible for the R6 and R7 bands. Reliable models for the distribution of neutral H and He in the solar system permit estimation of the contribution of interplanetary SWCX emission over the the whole sky and correction of the RASS maps. We find that the average SWCX contribution in the whole sky is 26{\%} ± 6{\%} ± 13{\%} for R1, 30{\%} ± 4{\%} ± 4{\%} for R2, 8{\%} ± 5{\%} ± 5{\%} for R4, for R5, and negligible for R6 and R7.",
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AU - Cravens, T.

AU - Galeazzi, Massimiliano

AU - Koutroumpa, D.

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