A NICER look at the state transitions of the black hole candidate MAXI J1535-571 during its reflares
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 similar to ∼10³⁵-³⁶ erg s⁻¹ (d/4.1 kpc)². To inves...
| Autor principal: | |
|---|---|
| Formato: | Articulo Preprint |
| Lenguaje: | Inglés |
| Publicado: |
2020
|
| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/125611 |
| Aporte de: |
| id |
I19-R120-10915-125611 |
|---|---|
| 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 Black hole physics Stars: individual: MAXI J1535−571 X-rays: binaries |
| spellingShingle |
Ciencias Astronómicas Accretion Accretion discs Black hole physics Stars: individual: MAXI J1535−571 X-rays: binaries Combi, Jorge Ariel A NICER look at the state transitions of the black hole candidate MAXI J1535-571 during its reflares |
| topic_facet |
Ciencias Astronómicas Accretion Accretion discs Black hole physics Stars: individual: MAXI J1535−571 X-rays: binaries |
| description |
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 similar to ∼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 similar to ∼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. |
| format |
Articulo Preprint |
| author |
Combi, Jorge Ariel |
| author_facet |
Combi, Jorge Ariel |
| author_sort |
Combi, Jorge Ariel |
| title |
A NICER look at the state transitions of the black hole candidate MAXI J1535-571 during its reflares |
| title_short |
A NICER look at the state transitions of the black hole candidate MAXI J1535-571 during its reflares |
| title_full |
A NICER look at the state transitions of the black hole candidate MAXI J1535-571 during its reflares |
| title_fullStr |
A NICER look at the state transitions of the black hole candidate MAXI J1535-571 during its reflares |
| title_full_unstemmed |
A NICER look at the state transitions of the black hole candidate MAXI J1535-571 during its reflares |
| title_sort |
nicer look at the state transitions of the black hole candidate maxi j1535-571 during its reflares |
| publishDate |
2020 |
| url |
http://sedici.unlp.edu.ar/handle/10915/125611 |
| work_keys_str_mv |
AT combijorgeariel anicerlookatthestatetransitionsoftheblackholecandidatemaxij1535571duringitsreflares AT combijorgeariel nicerlookatthestatetransitionsoftheblackholecandidatemaxij1535571duringitsreflares |
| bdutipo_str |
Repositorios |
| _version_ |
1764820451941416962 |