Study of X-ray point sources in NGC 5643 and NGC 7457 with Chandra

Singha, Akram Chandrajit; Devi, A. Senorita

doi:10.1007/s10509-017-3189-6

Cited by 3 publications

(1 citation statement)

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“…They reported that the compact object in this ULX is most likely a stellar-mass black hole. Singha and Devi (2017) [22] studied the spectra of the ULXs in NGC 5643 and NGC 7457 and reported that some ULXs were found to be accreting at a sub-Eddington rate and some ULXs were accreting at super-Eddington rate on to stellar mass BHs. They also studied seven ULXs in NGC 2276 and they suggested that the compact objects associated with these seven sources are in the stellar mass BH range [23].…”

Section: Introductionmentioning

confidence: 99%

Spectral and Timing Study of the Newly Detected Ultraluminous X-Ray Sources in NGC 3585 Using Different Chandra Observations.

Devi,

Deshamukhya

2023

East Eur. J. Phys.

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The present work aims to study the previously unstudied Ultraluminous X-ray sources (ULXs) in the galaxy NGC 3585 at its various epochs of Chandra observation. We report here the detection of two new ULXs viz. CXOUJ111306.0-264825 (X-1) and CXOUJ111325.3-264732 (X-2) with their bolometric luminosity > 1039erg s−1 in its various Chandra observations. X-1 was found to be a spectrally hard ULX in both the epochs where it was detected. However in the ULX, X-2, a slight hardening of the spectra was observed within a period of 17 years. Assuming isotropic emission and explained by disk blackbody model, the spectrally softer epoch of X-2 with an inner disk temperature, kTin ∼ 0.79 keV and bolometric luminosity ∼ 2.51 × 1039erg s−1 implies for X-2 to be powered by a compact object, necessarily a black hole of mass, MBH ∼ 44.85+82.11−25.92M⊙ accreting at ∼ 0.42 times the Eddington limit. The Lightcurve of X-1 and X-2 binned at 500s, 1ks, 2ks and 4ks has shown no signature of short-term variability in both the ULXs in kilo-seconds time scales. Overall, both the detected ULXs seem to be almost static sources both in long-term (years) as well as short-term (kilo-seconds) time scales with the presently available Chandra Observations.

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Section: Introductionmentioning

confidence: 99%