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http://hdl.handle.net/2248/8068
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DC Field | Value | Language |
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dc.contributor.author | Vinokurov, A | - |
dc.contributor.author | Atapin, K | - |
dc.contributor.author | Bordoloi, O. P | - |
dc.contributor.author | Sarkisyan, A | - |
dc.contributor.author | Kashyap, U | - |
dc.contributor.author | Chakraborty, M | - |
dc.contributor.author | Rahna, P. T | - |
dc.contributor.author | Kostenkov, A | - |
dc.contributor.author | Solovyeva, Y | - |
dc.contributor.author | Fabrika, S | - |
dc.contributor.author | Safonova, M | - |
dc.contributor.author | Gogoi, R | - |
dc.contributor.author | Sutaria, F. K | - |
dc.contributor.author | Murthy, J | - |
dc.date.accessioned | 2022-10-21T09:01:00Z | - |
dc.date.available | 2022-10-21T09:01:00Z | - |
dc.date.issued | 2022-09 | - |
dc.identifier.citation | Astrophysical Bulletin, Vol. 77, No. 3, pp. 231–245 | en_US |
dc.identifier.issn | 1990-3421 | - |
dc.identifier.uri | http://hdl.handle.net/2248/8068 | - |
dc.description | Restricted Access | en_US |
dc.description | The original publication is available at the springerlink.com | - |
dc.description.abstract | We present the results of eight epochs of simultaneous UV and X-ray observations of the highly variable ultraluminous X-ray source (ULX) Holmberg II X-1 with AstroSat—Indian multiwavelength space satellite. During the entire observation period from late 2016 to early 2020, Holmberg II X-1 showed a moderate X-ray luminosity about of 8×10398×1039 erg s−1−1 and a hard power-law spectrum with Γ≲1.9Γ≲1.9. Due to low variability of the object in X-rays (by a factor 1.5) and insignificant variability in the UV range (upper limit approximately 25%) we could not find reliable correlation between flux changes in these ranges. Inside each particular observation, the X-ray variability amplitude is higher, reaching a factor of 2–3 respect to the mean level, however, it is observed in the form of relatively short stochastic bursts. We discussed our results in terms of three models of a heated donor star, a heated disk and a heated wind, and estimated the lower limit to the variability which would allow to reject at least part of them. | en_US |
dc.language.iso | en | en_US |
dc.publisher | Springer | en_US |
dc.relation.uri | https://doi.org/10.1134/S1990341322030129 | - |
dc.rights | ©The Author(s) | - |
dc.subject | Accretion | en_US |
dc.subject | Accretion disks | en_US |
dc.subject | X-rays: binaries | en_US |
dc.subject | X-rays: individual: Holmberg II X-1 | en_US |
dc.title | Simultaneous X-ray/UV Observations of Ultraluminous X-ray Source Holmberg II X-1 with Indian Space Mission Astrosat | en_US |
dc.type | Article | en_US |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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Simultaneous X-ray UV Observations of Ultraluminous X-ray Source Holmberg II X-1 with Indian Space Mission Astrosat.pdf Restricted Access | 1.47 MB | Adobe PDF | View/Open Request a copy |
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