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On the optical extinction and distance of GRS 1915+105
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Based on new millimeter and radio observations, we reevaluate the total hydrogen column density along the line of sight to the microquasar GRS 1915+105 to NH=(3.5 +/- 0.3) 10^22 cm^-2. Our value is consistent with the one derived from X-ray measurements, namely (3.8 +/- 0.3) 10^22 cm^-2 (Ebisawa et al. 1998). Using the empirical law between the visual extinction and the total column density of hydrogen, Av is found to 19.6 +/- 1.7 mag. This result is 7 mag lower than previously thought, and therefore, a reevaluation of infrared fluxes after derredening is needed. The revisited kinematic study allows to give a lower limit to the distance of GRS 1915+105, namely 6.0 kpc. Taking into account the most accurate upper limit of distance inferred from radio data (11.2 +/- 0.8 kpc; Fender et al. 1999) as well as this lower limit, this implies a distance of 9.0 +/- 3.0 kpc .
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Cited by 1 Pith paper
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An intrinsic decline of accretion activity in GRS 1915+105
Deep X-ray, radio, and infrared non-detections of GRS 1915+105 imply an intrinsic decline in accretion activity rather than enhanced obscuration, likely driven by 2023-2024 outflows clearing the inner disc.
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