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首页> 外文期刊>Astronomy and astrophysics >Bursting behavior of the Galactic center faint X-ray transient GRS?1741.9–2853
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Bursting behavior of the Galactic center faint X-ray transient GRS?1741.9–2853

机译：银河系中心微弱的X射线瞬态GRS的爆发行为？1741.9–2853

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Aims. The neutron star low-mass X-ray binary GRS1741.9-2853is a known type-I burster at the Galactic center. It is transient, faint, and located in a very crowded region, only 10' from the supermassive black hole SgrA.Therefore, its bursting behavior has been poorly studied so far. In particular, its persistent emission has rarely been detected between consecutive bursts, because of lack of sensitivity or confusion. This caused GRS1741.9-2853to be one of the nine ``burst-only sources'' identified by BeppoSAXa few years ago. The physical properties of GRS1741.9-2853bursts are of significant interest beacause we know little about the nuclear regimes of low accretion rate bursters. For the first time we analyze several bursts along with the persistent emission of the source, using INTEGRAL, XMM-Newton, and Swiftobservations. Methods. We investigate the source flux variability and bursting behavior during its 2005 and 2007 long outbursts. These events were monitored almost entirely by INTEGRAL, both in the soft (3-20keV) and hard (20-100keV) X-ray bands, and also partly by XMM-Newtonand Swift(2-10keV) in 2007. Results. In its last activity periods, 2005 and 2007, the persistent luminosity of GRS1741.9-2853varied between 1.7 and ergs-1, i.e., 0.9-5.3% of the Eddington luminosity. The shape of the spectrum as described by an absorbed power-law remained with a photon index and a column density cm-2throughout the outbursts. We discovered 11 type-I bursts with INTEGRAL, and inspected four additional bursts: two recorded by XMM-Newtonand two by Swift. From the brightest burst, we derive an upper limit to the source distance of 7kpc. The observed bursts characteristics and source accretion rate infer pure helium explosions igniting at column depths gcm-2, for typical energy releases of erg. Key words: Galaxy: center - stars: neutron - X-rays: individuals: GRS1741.9-2853- X-rays: binaries - X-rays: bursts
机译：目的中子星低质量X射线双星GRS1741.9-2853是银河系中心已知的I型爆发器。它是短暂的，微弱的，并且位于非常拥挤的区域，距离超大质量黑洞SgrA仅10'，因此，到目前为止，对爆裂行为的研究还很少。特别是，由于缺乏灵敏度或混乱，很少能在连续爆发之间检测到它的持续发射。这导致GRS1741.9-2853成为BeppoSAXa几年前确定的九种``仅爆炸源''之一。 GRS1741.9-2853爆发的物理性质引起了人们的极大兴趣，因为我们对低积聚速率爆发的核机制了解甚少。第一次，我们使用INTEGRAL，XMM-Newton和Swiftobservations分析了几个脉冲以及源的持续发射。方法。我们调查了2005年和2007年长期爆发期间的源通量变异性和爆发行为。这些事件几乎全部由INTEGRAL监测，包括软（3-20keV）和硬（20-100keV）X射线带，2007年还部分由XMM-Newtonand Swift（2-10keV）监测。结果。在2005和2007年的最后一个活动期间，GRS1741.9-2853的持续发光度在1.7至ergs-1之间变化，即为爱丁顿发光度的0.9-5.3％。吸收功率定律所描述的光谱形状在整个爆发期间都保持着光子指数和柱密度cm-2。我们使用INTEGRAL发现了11个I型脉冲串，并检查了另外四个脉冲串：两个由XMM-Newton记录，另外两个由Swift记录。从最亮的突发中，我们得出源距离为7kpc的上限。对于典型的erg能量释放，观察到的爆发特性和源增长速率推断纯氦爆炸在柱深度gcm-2处点燃。关键词：银河系：中心-恒星：中子-X射线：个体：GRS1741.9-2853- X射线：双星-X射线：爆发

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