SwePub
Sök i LIBRIS databas

  Utökad sökning

onr:"swepub:oai:DiVA.org:kth-247813"
 

Sökning: onr:"swepub:oai:DiVA.org:kth-247813" > Evolving optical po...

  • Veledina, AlexandraStockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Univ Turku, Dept Phys & Astron, Turku 20014, Finland.;Stockholm Univ, Roslagstullsbacken 23, S-10691 Stockholm, Sweden.;Russian Acad Sci, Space Res Inst, Profsoyuznaya Str 84-32, Moscow 117997, Russia.,Nordiska institutet för teoretisk fysik (Nordita),University of Turku, Finland; Space Research Institute of the Russian Academy of Sciences, Russia (författare)

Evolving optical polarisation of the black hole X-ray binary MAXI J1820+070

  • Artikel/kapitelEngelska2019

Förlag, utgivningsår, omfång ...

  • 2019-03-06
  • EDP SCIENCES S A,2019
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:kth-247813
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-247813URI
  • https://doi.org/10.1051/0004-6361/201834140DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-167494URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • QC 20190401
  • Aims. The optical emission of black hole transients increases by several magnitudes during the X-ray outbursts. Whether the extra light arises from the X-ray heated outer disc, from the inner hot accretion flow, or from the jet is currently debated. Optical polarisation measurements are able to distinguish the relative contributions of these components. Methods. We present the results of BVR polarisation measurements of the black hole X-ray binary MAXI J1820+070 during the period of March-April 2018. Results. We detect small, similar to 0.7%, but statistically significant polarisation, part of which is of interstellar origin. Depending on the interstellar polarisation estimate, the intrinsic polarisation degree of the source is between similar to 0.3% and 0.7%, and the polarisation position angle is between similar to 10 degrees-30 degrees. We show that the polarisation increases after MJD 58222 (2018 April 14). The change is of the order of 0.1% and is most pronounced in the R band. The change of the source Stokes parameters occurs simultaneously with the drop of the observed V-band flux and a slow softening of the X-ray spectrum. The Stokes vectors of intrinsic polarisation before and after the drop are parallel, at least in the V and R filters. Conclusions. We suggest that the increased polarisation is due to the decreasing contribution of the non-polarized component, which we associate with the the hot flow or jet emission. The low polarisation can result from the tangled geometry of the magnetic field or from the Faraday rotation in the dense, ionised, and magnetised medium close to the black hole. The polarized optical emission is likely produced by the irradiated disc or by scattering of its radiation in the optically thin outflow.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Berdyugin, Andrei, VUniv Turku, Dept Phys & Astron, Turku 20014, Finland. (författare)
  • Kosenkov, Ilia A.Univ Turku, Dept Phys & Astron, Turku 20014, Finland.;St Petersburg State Univ, Dept Astrophys, Univ Skiy Pr 28, St Petersburg 198504, Russia. (författare)
  • Kajava, Jari J. E.Univ Turku, Finnish Ctr Astron ESO FINCA, Turku 20014, Finland. (författare)
  • Tsygankov, Sergey S.Univ Turku, Dept Phys & Astron, Turku 20014, Finland.;Russian Acad Sci, Space Res Inst, Profsoyuznaya Str 84-32, Moscow 117997, Russia. (författare)
  • Piirola, VilppuUniv Turku, Dept Phys & Astron, Turku 20014, Finland. (författare)
  • Berdyugin, Svetlana, VKiepenheuer Inst Sonnenphys, Schoneckstr 6, D-79104 Freiburg, Germany.;Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA. (författare)
  • Sakanoi, TakeshiTohoku Univ, Grad Sch Sci, Aoba Ku, Sendai, Miyagi 9808578, Japan. (författare)
  • Kagitani, MasatoTohoku Univ, Grad Sch Sci, Aoba Ku, Sendai, Miyagi 9808578, Japan. (författare)
  • Kravtsov, VadimSt Petersburg State Univ, Dept Astrophys, Univ Skiy Pr 28, St Petersburg 198504, Russia. (författare)
  • Poutanen, JuriStockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Univ Turku, Dept Phys & Astron, Turku 20014, Finland.;Stockholm Univ, Roslagstullsbacken 23, S-10691 Stockholm, Sweden.;Russian Acad Sci, Space Res Inst, Profsoyuznaya Str 84-32, Moscow 117997, Russia.,Nordiska institutet för teoretisk fysik (Nordita),University of Turku, Finland; Space Research Institute of the Russian Academy of Sciences, Russia(Swepub:su)jpout (författare)
  • KTHNordic Institute for Theoretical Physics NORDITA (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Astronomy and Astrophysics: EDP SCIENCES S A6230004-63611432-0746

Internetlänk

Hitta via bibliotek

Till lärosätets databas

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy