Dissecting the X-Ray Emission in the Young Planetary Nebula NGC 7027

被引:10
作者
Montez, Rodolfo, Jr. [1 ]
Kastner, Joel H. [2 ,3 ]
机构
[1] Smithsonian Astrophys Observ, 60 Garden St, Cambridge, MA 02138 USA
[2] Rochester Inst Technol, Ctr Imaging Sci, 54 Lomb Mem Dr, Rochester, NY 14623 USA
[3] Rochester Inst Technol, Lab Multiwavelength Astrophys, 54 Lomb Mem Dr, Rochester, NY 14623 USA
基金
美国国家航空航天局;
关键词
planetary nebulae: general; planetary nebulae: individual (NGC 7027); plasmas; stars:; winds; outflows; X-rays: general; HOT BUBBLE; CENTRAL STAR; R-AQUARII; NGC-7027; MODEL; JET; EVOLUTION; ABUNDANCE; DEPLETION; ORIGIN;
D O I
10.3847/1538-4357/aac5df
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present an analysis of a second observation of the young planetary nebula (PN) NGC 7027 by the Chandra X-ray Observatory. This latest 59.2 ks exposure with ACIS-S was acquired approximately 14 years after the initial 18.2 ks ACIS-S observation, and the improved photon statistics allow us to perform a detailed spatial and spectral analysis of the X-ray emission. Comparison with multiwavelength imaging of NGC 7027 reveals a strong anti-correlation between extinction across the nebula and the soft-band X-ray emission. Dissecting the X-ray emission into low- and high-extinction regions results in more robust characterization of the plasma spectral properties. We determine that the X-ray emitting plasma has a temperature of similar to 3.6 MK, is deficient in Fe, and has an X-ray luminosity of L-X similar to 7 x 10(31) erg s(-1), all of which are generally consistent with the plasma properties found in PN hot bubbles. We find no evidence of evolution in the X-ray surface brightness over the 14 year baseline between CXO observations. Our analysis underscores the importance of accounting for nebular absorption of the X-ray emission in accurately determining plasma properties for hot bubbles within PNe.
引用
收藏
页数:7
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