Publication: Thai national telescope studies of ultraluminous X-ray sources
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Issued Date
2019
Resource Type
File Type
application/pdf
ISSN
17426588
Other identifier(s)
2-s2.0-85077821709
Rights Holder(s)
Scopus
Bibliographic Citation
Journal of Physics: Conference Series. Vol 1380, No.1 (2019)
Suggested Citation
Thongpoyai K., Luangtip W., Sawangwit U., Roberts T.P., Komonjinda S., Dhillon V.S., Marsh T.R. Thai national telescope studies of ultraluminous X-ray sources. Journal of Physics: Conference Series. Vol 1380, No.1 (2019). doi:10.1088/1742-6596/1380/1/012089 Retrieved from: https://hdl.handle.net/20.500.14740/5019
Abstract
Ultraluminous X-ray sources (ULXs) are extra-galactic, non-nuclear sources with X-ray luminosity in excess of 1039 erg s-1. It has been thought that the majority of ULX populations are stellar-mass objects accreting matter at a super-Eddington rate. Although ULX studies are often focused in the X-ray regime, this work studied the ULXs in the optical regime, identified as the ULX counterparts (CTPs). The optical variability of nine CTPs were observed using the 2.4-m Thai National Telescope. Out of the nine ULXs, we detected three ULXs exhibiting strong variability up to ∼1 magnitude, suggesting that the CTP light does not come from the donor star's emission. The paper discusses the physical origins of the variability which potentially explain the observed light curves. © Published under licence by IOP Publishing Ltd.