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微类星体1E 1740 - 2942和GRS 1758 - 258的深红外成像

Deep Infrared Imaging of the Microquasars 1E1740-2942 and GRS 1758-258

S. S. Eikenberry, W. J. Fischer, E. Egami, S. G. Djorgovski

摘要:

1998年6月,我们利用10米望远镜对银河系微类星体1E1740 - 2942和GRS 1758 - 258进行了深红外($2.2 μ$ m)成像。观测是在极好的视宁度条件下进行的($\sim 0.45 \arcsec$全宽半高),这使得它们对于这些拥挤的领域来说格外深入。我们使用USNO-A2. 0星表对红外图像进行天体测量校准(在GRS 1758 - 258的情况下,还使用了光学CCD图像),为天体的已知射电位置提供了独立的框架关系。对于1E1740 - 2942,我们确认了先前由Marti等人确定的微类星体的潜在候选者,并显示在1998年至1999年期间,微类星体附近的天体都没有明显的变化。对于GRS 1758 - 258,我们的天体测量表明,它的位置与以前报告的微类星体候选者不同。我们发现没有候选人在我们的90%的置信半径的$2 σ$限制的幅度$K_s = 20.3$马格。我们讨论了这些结果的性质的微类星体二进制系统的影响。

英文摘要:

We present deep infrared ($2.2 μ$m) imaging of the Galactic microquasars 1E1740-2942 and GRS 1758-258 using the Keck-I 10-meter telescope in June 1998. The observations were taken under excellent seeing conditions ($\sim 0.45 \arcsec$ full-width half-maximum), making them exceptionally deep for these crowded fields. We used the USNO-A2.0 catalog to astrometrically calibrate the infrared images (along with an optical CCD image in the case of GRS 1758-258), providing independent frame ties to the known radio positions of the objects. For 1E1740-2942, we confirm potential candidates for the microquasar previously identified by Marti et al., and show that none of the objects near the microquasar have varied significantly from 1998 to 1999. For GRS 1758-258, our astrometry indicates a position shifted from previous reports of candidates for the microquasar. We find no candidates inside our 90% confidence radius to a $2 σ$ limiting magnitude of $K_s = 20.3$ mag. We discuss the implications of these results for the nature of the microquasar binary systems.

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