2021A&A...647A...7L


Query : 2021A&A...647A...7L

2021A&A...647A...7L - Astronomy and Astrophysics, volume 647A, 7-7 (2021/3-1)

A giant X-ray dust scattering ring discovered with SRG/eROSITA around the black hole transient MAXI J1348-630.

LAMER G., SCHWOPE A.D., PREDEHL P., TRAULSEN I., WILMS J. and FREYBERG M.

Abstract (from CDS):

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±2M. 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.

Abstract Copyright: © ESO 2021

Journal keyword(s): dust, extinction - stars: black holes - stars: distances - stars: individual: MAXI J1348-630 - X-rays: ISM - X-rays: binaries

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 SN 2003lw SN* 08 02 30.1 -39 51 03       20.23   SNIc: 547 0
2 MAXI J1348-630 HX? 13 48 12.7388336424 -63 16 29.709083208           ~ 140 0
3 V* BR Cir HXB 15 20 40.8532547060 -57 10 00.206639033   21.4 21.4     ~ 781 1
4 V* QV Nor HXB 15 42 23.3633146128 -52 23 09.577395960   16.3 14.5     B0.2Ia:e 420 1
5 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4329 0
6 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1936 2
7 NAME Sct-Cen PoG ~ ~           ~ 228 0

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