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A Large Misalignment between Continuous Jet and Discrete Ejecta in Microquasar GRS 1915+105 during Its Obscured Phase

  • Authors: Wu Jiang, Xi Yan, Zhen Yan, Ya-Ping Li, Lang Cui, Zhi-Qiang Shen

Wu Jiang et al 2026 The Astrophysical Journal Letters 1000 .

  • Provider: AAS Journals

Caption: Figure 1.

Large misalignment of position angles between continuous jets and discrete ejecta in GRS 1915+105. Radio images are obtained by the East Asian VLBI Network (EAVN) in the left and the Karl G. Jansky Very Large Array (VLA) in the right, with the image parameters summarized in Table 2. At the distance of GRS 1915+105 (∼9.4 kpc), 1 mas corresponds to 9.4 au here. The two-sided blobs at both 6.7 GHz of EAVN and 10 GHz of VLA are recognized as discrete ejecta. The extended structure at 43 GHz of EAVN and the center of VLA are continuous jets. The FWHMs of synthesized beams are around 6 mas × 3 mas and 0.9 mas× 0.5 mas for the EAVN at 6.7 GHz (blue) and 43 GHz (red), respectively. It is about 160 mas× 150 mas for the VLA at 10 GHz (gray). Contours in the three frequencies start at 4 times the image rms noise levels of 0.8, 5.0, and 0.3 mJy beam−1, respectively, and increase by factors of 2. The PA directions of the main two-sided ejecta (S1 and N1) from EAVN images at 6.7 GHz: PA ∼192, ∼186, and ∼186 on 2023 April 15, April 17, and April 23, respectively. The dashed lines are linear fits to radial distances of the S1 and N1 components as a function of time (see Table 2). The apparent speeds are 6.50 ± 0.18 mas days−1 for S1 and 6.53 ± 0.19 mas days−1 for N1, respectively. Extrapolation further indicates that both components were ejected around MJD 60045. The PA of continuous jets from EAVN 43 GHz data: PA ∼158, and ∼146 on 2023 April 16 and 19, respectively; PA ∼174 and ∼148 for the discrete ejecta (S2 and N2) and center continuous jet are indicated by dotted lines from VLA 10 GHz data on 2023 September 30, respectively.

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