The origin of the local 1/4-keV X-ray flux in both charge exchange and a hot bubble

被引：71

作者：

Galeazzi, M. ^{[1
]}

Chiao, M. ^{[2
]}

Collier, M. R. ^{[2
]}

Cravens, T. ^{[3
]}

Koutroumpa, D. ^{[4
]}

Kuntz, K. D. ^{[5
]}

Lallement, R. ^{[6
]}

Lepri, S. T. ^{[7
]}

McCammon, D. ^{[8
]}

Morgan, K. ^{[8
]}

Porter, F. S. ^{[2
]}

Robertson, I. P. ^{[3
]}

Snowden, S. L. ^{[2
]}

Thomas, N. E. ^{[2
]}

Uprety, Y. ^{[1
]}

Ursino, E. ^{[1
]}

Walsh, B. M. ^{[2
]}

机构：

[1] Univ Miami, Dept Phys, Coral Gables, FL 33124 USA

[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[3] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA

[4] Univ Paris 06, Sorbonne Univ, Univ Versailles St Quentin, CNRS,INSU,LATMOS IPSL, F-78280 Guyancourt, France

[5] Johns Hopkins Univ, Henry A Rowland Dept Phys & Astron, Baltimore, MD 21218 USA

[6] Univ Paris Diderot, GEPI Observ Paris, CNRS, UMR 8111, F-92190 Meudon, France

[7] Univ Michigan, Dept Atmospher Ocean & Space Sci, Ann Arbor, MI 48109 USA

[8] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

来源：

NATURE | 2014年 / 512卷 / 7513期

关键词：

SOLAR-WIND; BACKGROUND FLUX; EMISSION; GAS; INFERENCES; MODEL;

D O I：

10.1038/nature13525

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The solar neighbourhood is the closest and most easily studied sample of the Galactic interstellar medium, an understanding of which is essential for models of star formation and galaxy evolution. Observations of an unexpectedly intense diffuse flux of easily absorbed 1/4-kiloelectronvolt X-rays(1,2), coupled with the discovery that interstellar space within about a hundred parsecs of the Sun is almost completely devoid of cool absorbing gas(3), led to a picture of a 'local cavity' filled with X-ray-emitting hot gas, dubbed the local hot bubble(4-6). This model was recently challenged by suggestions that the emission could instead be readily produced within the Solar System by heavy solar-wind ions exchanging electrons with neutral H and He in interplanetary space(7-11), potentially removing the major piece of evidence for the local existence of million-degree gas within the Galactic disk(12-15). Here we report observations showing that the total solar-wind charge-exchange contribution is approximately 40 per cent of the 1/4-keV flux in the Galactic plane. The fact that the measured flux is not dominated by charge exchange supports the notion of a million-degree hot bubble extending about a hundred parsecs from the Sun.

引用

页码：171 / +

页数：6

共 24 条

[1] DETECTION OF AN ANISOTROPIC SOFT X-RAY BACKGROUND FLUX [J].