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http://hdl.handle.net/2289/7785Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Ghosh, Tanuman | - |
| dc.contributor.author | Rana, Vikram | - |
| dc.date.accessioned | 2021-06-29T06:11:24Z | - |
| dc.date.available | 2021-06-29T06:11:24Z | - |
| dc.date.issued | 2021-06 | - |
| dc.identifier.citation | Monthly Notices of the Royal Astronomical Society, 2021, Vol. 504, p974–982 | en_US |
| dc.identifier.issn | 0035-8711 | - |
| dc.identifier.issn | 1365-2966 (Online) | - |
| dc.identifier.uri | http://hdl.handle.net/2289/7785 | - |
| dc.description | Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations) | en_US |
| dc.description.abstract | We present the results of high-quality XMM-NEWTON observations of a ultraluminous X-ray source (ULX) in the galaxy NGC 4190. The detection of spectral cutoff in NGC 4190 ULX1 spectra rules out the interpretation of the ULX to be in a standard low/hard canonical accretion state. We report that the high quality EPIC spectra can be better described by broad thermal component, such as a slim disc. In addition we found long-term spectral and flux variability in the source using several XMM-NEWTON and Swift data. A clear anticorrelation between flux and power-law photon index is found which further confirms the unusual spectral state evolution of the ULX. Spectral properties of the ULX suggest that the source is in a broadened disc state with luminosities [≈(3 − 10) × 1039 erg s−1] falling in the ultraluminous regime. The positive luminosity–temperature relation further suggests that the multicolour disc model follows the L ∝ T4 relation that is expected for a blackbody disc emission from a constant area and the slim disc model seems to favour L ∝ T2 relation consistent with an advection-dominated disc emission. From the broadened disc-like spectral feature at such luminosity, we estimated the upper limit of the mass of the central compact object from the inner disc radius and found that the ULX hosts a stellar mass black hole. | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | Oxford University Press on behalf of the Royal Astronomical Society | en_US |
| dc.relation.uri | https://ui.adsabs.harvard.edu/abs/2021MNRAS.504..974G/abstract | en_US |
| dc.relation.uri | https://arxiv.org/abs/2103.10265 | en_US |
| dc.relation.uri | https://doi.org/10.1093/mnras/stab774 | en_US |
| dc.rights | 2021 The Author(s) | en_US |
| dc.subject | accretion | en_US |
| dc.subject | accretion discs | en_US |
| dc.subject | X-rays: binaries | en_US |
| dc.subject | X-rays: individual (NGC 4190 ULX1) | en_US |
| dc.title | Super-Eddington accretion on to a stellar mass ultraluminous X-ray source NGC 4190 ULX1 | en_US |
| dc.type | Article | en_US |
| Appears in Collections: | Research Papers (A&A) | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2021_MNRAS_V504, p974–982.pdf Restricted Access | Restricted Access | 918.16 kB | Adobe PDF | View/Open Request a copy |
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