2020MNRAS.496.1001C


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.16CEST11:34:46

2020MNRAS.496.1001C - Mon. Not. R. Astron. Soc., 496, 1001-1012 (2020/August-1)

A NICER look at the state transitions of the black hole candidate MAXI J1535-571 during its reflares.

CUNEO V.A., ALABARTA K., ZHANG L., ALTAMIRANO D., MENDEZ M., ARMAS PADILLA M., REMILLARD R., HOMAN J., STEINER J.F., COMBI J.A., MUNOZ-DARIAS T., GENDREAU K.C., ARZOUMANIAN Z., STEVENS A.L., LOEWENSTEIN M., TOMBESI F., BULT P., FABIAN A.C., BUISSON D.J.K., NEILSEN J. and BASAK A.

Abstract (from CDS):

The black hole candidate and X-ray binary MAXI J1535-571 was discovered in 2017 September. During the decay of its discovery outburst, and before returning to quiescence, the source underwent at least four reflaring events, with peak luminosities of ∼1035–36 erg s–1 (d/4.1 kpc)2. To investigate the nature of these flares, we analysed a sample of NICER (Neutron star Interior Composition Explorer) observations taken with almost daily cadence. In this work, we present the detailed spectral and timing analysis of the evolution of the four reflares. The higher sensitivity of NICER at lower energies, in comparison with other X-ray detectors, allowed us to constrain the disc component of the spectrum at ∼0.5 keV. We found that during each reflare the source appears to trace out a q-shaped track in the hardness-intensity diagram similar to those observed in black hole binaries during full outbursts. MAXI J1535-571 transits between the hard state (valleys) and softer states (peaks) during these flares. Moreover, the Comptonized component is undetected at the peak of the first reflare, while the disc component is undetected during the valleys. Assuming the most likely distance of 4.1 kpc, we find that the hard-to-soft transitions take place at the lowest luminosities ever observed in a black hole transient, while the soft-to-hard transitions occur at some of the lowest luminosities ever reported for such systems.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - black hole physics - stars: individual: MAXI J1535-571 - X-rays: binaries

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 9

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Number of rows : 9

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* V518 Per HXB 04 21 42.7231318463 +32 54 26.936934166 13.00 13.50 13.2     M4.5V 626 1
2 MAXI J1348-630 HX? 13 48 12.7394623992 -63 16 29.707452139           ~ 25 0
3 MAXI J1535-571 XB* 15 35 19.73 -57 13 48.1           ~ 67 0
4 [GHJ2008] 3 HXB 16 50 00.980 -49 57 43.60     11.89     K4V 358 0
5 MAXI J1659-152 LXB 16 59 01.680 -15 15 28.73           ~ 199 0
6 XTE J1737-376 HX? 17 37 59 -37 46.3           ~ 37 1
7 V* V2606 Oph CV* 17 42 40.030 -27 44 52.70     23.2     ~ 119 0
8 MAXI J1807+132 LX? 18 08 07.549 +13 15 05.40           ~ 28 0
9 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 895 0

    Equat.    Gal    SGal    Ecl

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2021.04.16-11:34:46

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