Spectral study of the Ultraluminous X-ray sources in M51 at different epochs of Chandra observation

Sanatombi, Thokchom; Devi, A. Senorita; Singh, Keisham Surjit

doi:10.1016/j.cjph.2023.04.010

Cited by 3 publications

(2 citation statements)

References 47 publications

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“…Many other such HLXs with bolometric luminosity greater than 10 41 erg s −1 such as the HLXs reported in Singha and Devi (2019) [14] highly points towards these extremely luminous X-ray sources to be powered by accretion on to IMBH. Sanatombi et al (2023) [32] reported the super-soft ULX, CXOUJ132943.3+471135, in the galaxy M51 to harbor a black hole with mass ∼ 10 4 M ⊙ where they have also reported that even with extreme beaming case, the mass of the black hole harbored by this source is ∼ 10 3 M ⊙ .…”

Section: Introductionmentioning

confidence: 96%

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: 96%

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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“…This discovery has significantly contributed to our understanding of the potential formation mechanisms of Intermediate Mass Black Holes. The ULX model involving sub-Eddington accretion onto Intermediate Mass Black Holes (IMBHs) holds significant importance in elucidating the exceptionally high luminosities observed in certain ULXs, particularly those in very soft states such as CXOUJ132943.3+471135 of M51 [8], X-7 of NGC 6946 [9] etc.…”

Section: Introductionmentioning

confidence: 99%

Spectral and Temporal Properties of CXOUJ122956.7+075728 (ULX-1), an Ultraluminous X-Ray Source in NGC 4472

Devi

2024

East Eur. J. Phys.

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This report presents a comprehensive analysis of the spectral and temporal characteristics of a highly significant Ultraluminous X-ray Source (ULX) designated as CXOUJ122956.7+075728 (ULX-1) situated in the elliptical galaxy NGC 4472 within the Virgo cluster. ULX-1 exhibits a soft spectral state, featuring a cool accretion disk component with kTin ∼ 0.15 keV, accompanied by a power-law tail displaying a steep power-law photon index, Γ ∼ 2.8. The spectral findings strongly support an estimated black hole mass of approximately 3.30 × 103 M⊙ under an isotropic emission model, and around 1.47 × 103 M⊙ in an extreme beaming scenario. Temporally, ULX-1 displays significant variability on time scales of 0.5, 1, and 2 ks, suggesting the possibility of instabilities within the accretion disk contributing to this behavior. However, despite this temporal variability, the power spectra analysis of this soft ULX reveals no signatures of pulsations, distinguishing it from certain pulsating ULXs (PULXs) typically associated with neutron stars. This absence of pulsations in ULX-1 further underscores its unique spectral and temporal characteristics within the broader context of ULX phenomena.

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Study of the ultraluminous X-ray sources in NGC 4382 and NGC 1399 with Chandra

Devi,

Deshamukhya

2024

Indian J Phys

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Spectral study of the Ultraluminous X-ray sources in M51 at different epochs of Chandra observation

Cited by 3 publications

References 47 publications

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

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

Spectral and Temporal Properties of CXOUJ122956.7+075728 (ULX-1), an Ultraluminous X-Ray Source in NGC 4472

Study of the ultraluminous X-ray sources in NGC 4382 and NGC 1399 with Chandra

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