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JWST Reveals a Highly Ionized Nebula Powered by an Ultraluminous X-Ray Source with a Massive Black Hole in the Metal-poor Galaxy Holmberg II

  • Authors: F. A. Fogantini, P. Zeidler, L. M. Oskinova, T. Bao, W.-R. Hamann, P. Marchant, D. M.-A. Meyer, D. Pauli, S. Reyero Serantes, A. A. C. Sander, T. Shenar, R. Soria

F. A. Fogantini et al 2026 The Astrophysical Journal Letters 1011 .

  • Provider: AAS Journals

Caption: Figure 2.

Broadband near- and mid-infrared spectrum of Ho II X–1 nebula derived from STAGE 3 data cubes without background subtraction. The spectrum is extracted from a circular aperture with a radius of 1″ centered on the ULX position (∼16.5 pc) for display purposes only. The prominent emission lines are identified. MIRI MRS channel 1 was rebinned linearly by a factor of 10, as this channel is the most strongly affected by stray-light contamination.

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