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arXiv 1108.4615astro-ph.HE
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GRS 1915+105小型喷气发动机模型

Models of the Compact Jet in GRS 1915+105

Brian Punsly

摘要:

在这篇文章中,模型构建的紧凑型喷气在GRS 1915+105在一个时代的最佳数据捕获。2003年4月2日,在硬X射线/软伽马射线波段(INTEGRAL)、硬X射线波段(RXTE)、近红外(ESO/新技术望远镜)和VLBA(8.3 GHz和15 GHz)对该物体进行了观测。震源处于所谓的“高原状态”。“大的无线电通量在无线电图像中提供了高的信噪比。因此,可以将喷流成像到大的距离($ > 10^{15}$ cm)。这与宽带覆盖相结合,使这一时期最适合模拟喷气式飞机。参数方法开发的文件\cite{ghi85,ghi89,ghi96,sam97}已成功地利用在河外射电喷流的领域实现。基本模型是一个外部逆康普顿(EIC)散射的吸积盘光子射流等离子体提供硬X射线幂律。与活动星系核喷流不同的是,射电喷流在横向上必须是高度分层的,才能在射电图像中产生观测到的表面亮度分布。考虑了各种喷气模型。如果硬X射线的幂律光度来自喷流中的EIC,则喷流功率为$Q \approx 3-4 \times 10^{38}$ ergs/sec,如果X射线是从吸积盘日冕发射的,则为$Q \approx 2 - 9 \times 10^{37}$ ergs/sec。这些估计表明,喷流的功率可以高达总X射线光度的60%。

英文摘要:

In this article, models are constructed of the compact jet in GRS 1915+105 during an epoch of optimal data capture. On April 02, 2003, the object was observed in the hard X-ray/soft gamma ray band (INTEGRAL), hard X-ray band (RXTE), near IR (ESO/New Technology Telescope) and the VLBA (8.3 GHz and 15 GHz). The source was in a so-called "high plateau state." The large radio flux provides high signal to noise ratios in the radio images. Thus, one can image the jet out to large distances ($ > 10^{15}$ cm). This combined with the broadband coverage make this epoch the best suited for modeling the jet. The parametric method developed in the papers \cite{ghi85,ghi89,ghi96,sam97} that has been successfully utilized in the realm of extragalactic radio jets is implemented. The basic model is one where external inverse Compton (EIC) scattering of accretion disk photons by jet plasma provides the hard X-ray powerlaw. Unlike AGN jets, it is found that the radio jet must be highly stratified in the transverse direction in order to produce the observed surface brightness distribution in the radio images. Various jet models are considered. The jet power is $Q \approx 3-4 \times 10^{38}$ ergs/sec if the hard X-ray powerlaw luminosity is from EIC in the jet and $Q \approx 2 - 9 \times 10^{37}$ ergs/sec if the X-rays are emitted from the accretion disk corona. These estimates indicate that the jet power can be as high as 60% of the total X-ray luminosity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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