论文标题
SRGA J181414.6-225604：新的银河共生X射线二进制爆发，该爆发是由严重遮盖的Mira变量的强烈质量损失发作触发的
SRGA J181414.6-225604: A new Galactic symbiotic X-ray binary outburst triggered by an intense mass loss episode of a heavily obscured Mira variable
论文作者
论文摘要
我们介绍了SRGA J181414.6-225604的发现和多波长表征，这是一个在正在进行的SRG/ART-XC Sky Sky调查中发现的银河硬X射线瞬变。使用Palomar Gattini-ir调查中的数据，我们在空间和时间上确定了一个巧合的可变红外（IR），IRAS 18111-2257，并将其分类为非常晚期（M7-m8），长时间（$ 1502 \ $ 1502 \ pm 24 $ 24美元）和umir（$ mir $ _9 \ pm pm pm pm pm pm pm pm），niror at a pm pm。 14.6^{+2.9} _ { - 2.3} $ kpc。 Combining multi-color photometric data over the last $\approx 25$ years, we show that the IR counterpart underwent a recent (starting $\approx 800$ days before the X-ray flare) enhanced mass loss (reaching $\approx 2.1 \times 10^{-5}$ M$_\odot$ yr$^{-1}$) episode resulting in an expanding dust shell obscuring the underlying star. Swift，Mide和Nustar的多上段跟进显示了$ \ 200美元的X射线爆发，达到$ L_X \ $ L_X \约2.5 \ times 10^{36} $ erg S $^{ - 1} $ cm $^{ - 2} $）X射线频谱与光学厚的构成等离子体一致。 X射线光谱和时机行为表明存在块状风，并在紧凑型物体周围的硅酸盐材料中过多的密集的离子星云。我们一起表明，SRGA J181414.6-225604是爆发中新的共生X射线二元，这是由高度发展的供体的强烈尘埃形成触发的。我们的结果为增强的晚期供体质量损失与共生X射线二进制的活跃寿命之间的推测联系提供了首次直接确认。
We present the discovery and multi-wavelength characterization of SRGA J181414.6-225604, a Galactic hard X-ray transient discovered during the ongoing SRG/ART-XC sky survey. Using data from the Palomar Gattini-IR survey, we identify a spatially and temporally coincident variable infrared (IR) source, IRAS 18111-2257, and classify it as a very late-type (M7-M8), long period ($1502 \pm 24$ days) and luminous ($M_K\approx -9.9 \pm 0.2$) O-rich Mira donor star located at a distance of $\approx 14.6^{+2.9}_{-2.3}$ kpc. Combining multi-color photometric data over the last $\approx 25$ years, we show that the IR counterpart underwent a recent (starting $\approx 800$ days before the X-ray flare) enhanced mass loss (reaching $\approx 2.1 \times 10^{-5}$ M$_\odot$ yr$^{-1}$) episode resulting in an expanding dust shell obscuring the underlying star. Multi-epoch follow-up from Swift, NICER and NuSTAR reveal a $\approx 200$ day long X-ray outburst reaching a peak luminosity of $L_X \approx 2.5 \times 10^{36}$ erg s$^{-1}$, characterized by a heavily absorbed ($N_{\rm H} \approx 6\times 10^{22}$ cm$^{-2}$) X-ray spectrum consistent with an optically thick Comptonized plasma. The X-ray spectral and timing behavior suggest the presence of clumpy wind accretion together with a dense ionized nebula overabundant in silicate material surrounding the compact object. Together, we show that SRGA J181414.6-225604 is a new symbiotic X-ray binary in outburst, triggered by an intense dust formation episode of a highly evolved donor. Our results offer the first direct confirmation for the speculated connection between enhanced late-stage donor mass loss and active lifetimes of the symbiotic X-ray binaries.
