Discovery of thermonuclear (Type I) X-ray bursts in the X-ray binary Swift J1858.6-0814 observed with NICER and NuSTAR

Swift J1858.6–0814 is a recently discovered X-ray binary notable for extremely strong variability (by factors of >100 in soft X-rays) in its discovery state. We present the detection of five thermonuclear (Type I) X-ray bursts from Swift J1858.6–0814, implying that the compact object in the s...

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Detalles Bibliográficos
Autor principal: Mancuso, Giulio Cesare
Formato: Articulo
Lenguaje:Inglés
Publicado: 2020
Materias:
Ciencias Astronómicas
Accretion
Accretion discs
Stars: neutron
X-rays: binaries
X-rays: bursts
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125609
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125609
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Accretion
Accretion discs
Stars: neutron
X-rays: binaries
X-rays: bursts
spellingShingle Ciencias Astronómicas
Accretion
Accretion discs
Stars: neutron
X-rays: binaries
X-rays: bursts
Mancuso, Giulio Cesare
Discovery of thermonuclear (Type I) X-ray bursts in the X-ray binary Swift J1858.6-0814 observed with NICER and NuSTAR
topic_facet Ciencias Astronómicas
Accretion
Accretion discs
Stars: neutron
X-rays: binaries
X-rays: bursts
description Swift J1858.6–0814 is a recently discovered X-ray binary notable for extremely strong variability (by factors of >100 in soft X-rays) in its discovery state. We present the detection of five thermonuclear (Type I) X-ray bursts from Swift J1858.6–0814, implying that the compact object in the system is a neutron star (NS). Some of the bursts show photospheric radius expansion, so their peak flux can be used to estimate the distance to the system. The peak luminosity, and hence distance, can depend on several system parameters; for the most likely values, a high inclination and a helium atmosphere, D=12.8+0.8−0.6 kpc, although systematic effects allow a conservative range of 9–18 kpc. Before one burst, we detect a QPO at 9.6 ± 0.5 mHz with a fractional rms amplitude of 2.2 ± 0.2 per cent (0.5–10 keV), likely due to marginally stable burning of helium; similar oscillations may be present before the other bursts but the light curves are not long enough to allow their detection. We also search for burst oscillations but do not detect any, with an upper limit in the best case of 15 per cent fractional amplitude (over 1–8 keV). Finally, we discuss the implications of the NS accretor and this distance on other inferences which have been made about the system. In particular, we find that Swift J1858.6–0814 was observed at super-Eddington luminosities at least during bright flares during the variable stage of its outburst.
format Articulo
Articulo
author Mancuso, Giulio Cesare
author_facet Mancuso, Giulio Cesare
author_sort Mancuso, Giulio Cesare
title Discovery of thermonuclear (Type I) X-ray bursts in the X-ray binary Swift J1858.6-0814 observed with NICER and NuSTAR
title_short Discovery of thermonuclear (Type I) X-ray bursts in the X-ray binary Swift J1858.6-0814 observed with NICER and NuSTAR
title_full Discovery of thermonuclear (Type I) X-ray bursts in the X-ray binary Swift J1858.6-0814 observed with NICER and NuSTAR
title_fullStr Discovery of thermonuclear (Type I) X-ray bursts in the X-ray binary Swift J1858.6-0814 observed with NICER and NuSTAR
title_full_unstemmed Discovery of thermonuclear (Type I) X-ray bursts in the X-ray binary Swift J1858.6-0814 observed with NICER and NuSTAR
title_sort discovery of thermonuclear (type i) x-ray bursts in the x-ray binary swift j1858.6-0814 observed with nicer and nustar
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/125609
work_keys_str_mv AT mancusogiuliocesare discoveryofthermonucleartypeixrayburstsinthexraybinaryswiftj185860814observedwithnicerandnustar
bdutipo_str Repositorios
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