Journal
ASTRONOMY & ASTROPHYSICS
Volume 647, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202039757
Keywords
dust, extinction; stars: black holes; stars: distances; stars: individual: MAXI J1648-630; X-rays: ISM; X-rays: binaries
Categories
Funding
- primary instrument aboard SRG, a joint Russian-German science mission
- Russian Space Agency (Roskosmos)
- Deutsches Zentrum fur Luft- und Raumfahrt (DLR)
- Max Planck Institute for Extraterrestrial Physics (MPE)
- University of Hamburg Observatory
- Leibniz Institute for Astrophysics Potsdam (AIP)
- DLR
- Max Planck Society
- Argelander Institute for Astronomy of the University of Bonn
- Ludwig Maximilians Universitat Munchen
- German eROSITA consortium
- Bundesministerium fur Forschung und Technologie under Deutsches Zentrum fur Luft- und Raumfahrt [50 QR 1603, 50 QR 1614, 50 OX 1901, 50 OX 9562]
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A giant dust scattering ring around the Black Hole transient MAXI J1348-630 was discovered during the first X-ray all-sky survey with SRG/eROSITA. The distance of MAXI J1348-630 was measured to be 3390 pc, making it one of the black hole transients with the most accurately determined distances. This led to a revised mass estimate for the black hole and highlighted the importance of dust scattering halos in making precise distance measurements towards X-ray sources.
We report the discovery of a giant dust scattering ring around the Black Hole transient MAXI J1348-630 with SRG/eROSITA during its first X-ray all-sky survey. During the discovery observation in February 2020, the ring had an outer diameter of 1.3 deg, growing to 1.6 deg by the time of the second all-sky survey scan in August 2020. This makes the new dust ring by far the largest X-ray scattering ring observed so far. Dust scattering halos, in particular the rings found around transient sources, provide an opportunity to make precise distance measurements towards the original X-ray sources. We combine data from SRG/eROSITA, XMM-Newton, MAXI, and Gaia to measure the geometrical distance of MAXI J1348-630. The Gaia data place the scattering dust at a distance of 2050 pc. Based on the measured time lags and the geometry of the ring we find MAXI J1348-630 at a distance of 3390 pc with a statistical uncertainty of only 1.1% and a systematic uncertainty of 10% caused mainly by the parallax offset of Gaia. This result makes MAXI J1348-630 one of the black hole transients with the most accurately determined distances. The new distance leads to a revised mass estimate for the black hole of 11 +/- 2 M-circle dot. The transition to the soft state during the outburst occurred when the bolometric luminosity of MAXI J1348-630 reached 1.7% of its Eddington luminosity.
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