WFRF:(Hjalmarsdotter L.)
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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
Förlag, utgivningsår, omfång ...
- Oxford University Press (OUP),2009
- printrdacarrier
Nummerbeteckningar
- LIBRIS-ID:oai:DiVA.org:kth-84608
- https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-84608URI
- https://doi.org/10.1111/j.1365-2966.2009.14434.xDOI
- https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-25520URI
Kompletterande språkuppgifter
- Språk:engelska
- Sammanfattning på:engelska
Ingår i deldatabas
- SwePubSwePub
Klassifikation
Anmärkningar
- 20120214
- 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.
Ämnesord och genrebeteckningar
- NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
- NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
- Accretion
- accretion discs
- Stars
- individual
- Cyg X-3
- X-rays
- binaries
- Astronomy and astrophysics
Biuppslag (personer, institutioner, konferenser, titlar ...)
- Larsson, StefanHigh-energy astrophysics(Swepub:su)slars (författare)
- Hjalmarsdotter, L.High-energy astrophysics (författare)
- Stockholms universitetInstitutionen för astronomi (creator_code:org_t)
Sammanhörande titlar
- Ingår i:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)394:3, s. 1544-15500035-87111365-2966
Internetlänk
- http://www.scopus.com/inward/record.url?eid=2-s2.0-63549131362&partnerID=40&md5=1ace70c81a44d3d8f6d580fc7416ba4b
- https://academic.oup.com/mnras/article-pdf/394/3/1544/3699724/mnras0394-1544.pdf
- https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-84608
- https://doi.org/10.1111/j.1365-2966.2009.14434.x
- https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-25520
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- Monthly notices of the Royal Astronomical Society (Sök värdpublikationen i LIBRIS)
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- Axelsson, Magnus
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