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The aperiodic broad...
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Axelsson, MagnusStockholms universitet,Institutionen för astronomi,High-energy astrophysics
(författare)
The aperiodic broad-band X-ray variability of Cygnus X-3
- Artikel/kapitelEngelska2009
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Oxford University Press (OUP),2009
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LIBRIS-ID:oai:DiVA.org:kth-84608
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-84608URI
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https://doi.org/10.1111/j.1365-2966.2009.14434.xDOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-25520URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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20120214
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We study the soft X-ray variability of Cygnus X-3. By combining data from the All-Sky Monitor and Proportional Counter Array instruments on the RXTE satellite with EXOSAT/Medium Energy (ME) detector observations, we are able to analyse the power density spectrum (PDS) of the source from 10-9 to 0.1 Hz, thus covering time-scales from seconds to years. As the data on the longer time-scales are unevenly sampled, we combine traditional power spectral techniques with simulations to analyse the variability in this range. The PDS at higher frequencies (≳10-3 Hz) are for the first time compared for all states of this source. We find that it is for all states well described by a power law, with index ∌ -2 in the soft states and a tendency for a less steep power law in the hard state. At longer time-scales, we study the effect of the state transitions on the PDS, and find that the variability below ∌10-7 Hz is dominated by the transitions. Furthermore, we find no correlation between the length of a high/soft-state episode and the time since the previous high/soft state. On intermediate time-scales, we find evidence for a break in the PDS at time-scales of the order of the orbital period. This may be interpreted as evidence for the existence of a tidal resonance in the accretion disc around the compact object, and constraining the mass ratio to M2/M1 ≲ 0.3.
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Larsson, StefanHigh-energy astrophysics(Swepub:su)slars
(författare)
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Hjalmarsdotter, L.High-energy astrophysics
(författare)
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Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)394:3, s. 1544-15500035-87111365-2966
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