Outbursting Nature of the Recurring Transient Black Hole Candidate 4U 1630-472 in past two and half decades
Abstract
In the post Launch of RXTE (1996-2020), the Galactic black hole candidate (BHC) 4U 1630-472 has shown 13 outbursts. Similar to other transient BHCs, the outbursts of this source also showed variations in duration, peak numbers, highest peak flux, etc. However, unlike other soft X-ray transients, it showed two types of outbursts: normal and super. The duration of the normal outbursts are observed to vary between 100-200 days and the average recurrence or quiescence period prior to the outbursts are found to be ∼ 500 days. The super outbursts are observed for around 1.5-2.5 years, and they were found to consist of two normal and one mega outburst within the outburst durations. We tried to make an effort to separate the flux contributions of the normal and mega compo-ents from the super outbursts. The nature of the evolution of both types (normal and mega) of outbursts, based on the quiescent period prior to the outbursts and flux contributions are studied. We use archival data of RXTE or ASM from 1996 January to 2011 June, and MAXI or GSC from 2009 August to 2020 July for our study. Based on the variations of various properties of both the normal and mega outbursts, we concluded that this BHC is a special source consisting of two companions. These two companions might be responsible for two types (normal and mega) of outbursts.
- Publication:
-
44th COSPAR Scientific Assembly. Held 16-24 July
- Pub Date:
- July 2022
- Bibcode:
- 2022cosp...44.1911D