2020A&A...640L...3S


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.01CET00:49:41

2020A&A...640L...3S - Astronomy and Astrophysics, volume 640, L3-3 (2020/8-1)

Near-infrared emission lines trace the state-independent accretion disc wind of the black hole transient MAXI J1820+070.

SANCHEZ-SIERRAS J. and MUNOZ-DARIAS T.

Abstract (from CDS):

The black hole transient MAXI J1820+070 displayed optical P Cyg profiles and other wind-related emission line features during the hard state of its discovery outburst. We present near-infrared (NIR) spectroscopy covering the different accretion states of the system during this event. Our eight-epoch data set (VLT/X-shooter) reveals strong variability in the properties of the NIR emission lines. This includes absorption troughs and extended emission line wings with kinetic properties that are remarkably similar to those inferred from the wind signatures observed in optical emission lines, indicating that they most likely trace the same accretion disc wind. Unlike the optical features, these NIR signatures are not exclusive of the hard state, as they are also witnessed across the soft state with similar observational properties. This supports the presence of a relatively steady outflow during the entire outburst of the system, and it represents the first detection of an accretion disc wind in a black hole soft state at energies other than X-rays. We discuss the visibility of the wind as a function of the spectral band and the potential of NIR spectroscopy for wind studies, in particular during luminous accretion phases.

Abstract Copyright: © ESO 2020

Journal keyword(s): accretion - accretion disks - X-rays: binaries - stars: black holes - stars: winds - outflows - infrared: general - techniques: spectroscopic

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 - 2021
#notes
1 V* V818 Sco LXB 16 19 55.0688745859 -15 38 25.019920749 11.60 12.40 11.1     Oev 1533 0
2 V* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1791 0
3 V* V5512 Sgr LXB 18 14 31.55 -17 09 26.7           K5III 356 0
4 V* V4641 Sgr HXB 18 19 21.6342721789 -25 24 25.849323550     13.654   13.092 B9III 403 1
5 MAXI J1820+070 LXB 18 20 21.9424256519 +07 11 07.278818899           ~ 105 0
6 SWIFT J1858.6-0814 X 18 58 34.91 -08 14 14.8           ~ 15 0
7 V* V404 Cyg HXB 20 24 03.820 +33 52 01.90 14.50 14.20 12.7     K0IV 1109 0

    Equat.    Gal    SGal    Ecl

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2020.12.01-00:49:41

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