SwePub
Sök i LIBRIS databas

  Extended search

WFRF:(Higgins A)
 

Search: WFRF:(Higgins A) > (2010-2014) > Polarisation observ...

  • Harwit, M.Cornell University (author)

Polarisation observations of VY Canis Majoris H2O 532-441 620.701 GHz maser emission with HIFI

  • Article/chapterEnglish2010

Publisher, publication year, extent ...

  • 2010-10-01
  • EDP Sciences,2010
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:27884a6b-8e9e-4982-b763-aeed3a22904a
  • https://research.chalmers.se/publication/131897URI
  • https://doi.org/10.1051/0004-6361/201015042DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • Context. Water vapour maser emission from evolved oxygen-rich stars remains poorly understood. Additional observations, including polarisation studies and simultaneous observation of different maser transitions may ultimately lead to greater insight. Aims. We have aimed to elucidate the nature and structure of the VY CMa water vapour masers in part by observationally testing a theoretical prediction of the relative strengths of the 620.701 GHz and the 22.235 GHz maser components of ortho H2O. Methods. In its high-resolution mode (HRS) the Herschel Heterodyne Instrument for the Far Infrared (HIFI) offers a frequency resolution of 0.125 MHz, corresponding to a line-of-sight velocity of 0.06 km s(-1), which we employed to obtain the strength and linear polarisation of maser spikes in the spectrum of VY CMa at 620.701 GHz. Simultaneous ground based observations of the 22.235 GHz maser with the Max-Planck-Institut fur Radioastronomie 100-m telescope at Effelsberg, provided a ratio of 620.701 GHz to 22.235 GHz emission. Results. We report the first astronomical detection to date of H2O maser emission at 620.701 GHz. In VY CMa both the 620.701 and the 22.235 GHz polarisation are weak. At 620.701 GHz the maser peaks are superposed on what appears to be a broad emission component, jointly ejected from the star. We observed the 620.701 GHz emission at two epochs 21 days apart, both to measure the potential direction of linearly polarised maser components and to obtain a measure of the longevity of these components. Although we do not detect significant polarisation levels in the core of the line, they rise up to approximately 6% in its wings.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Houde, M.Western University (author)
  • Sonnentrucker, P.Johns Hopkins University (author)
  • Boogert, A.California Institute of Technology (Caltech) (author)
  • Cernicharo, J. (author)
  • De Beck, Elvire,1985Katholieke Universiteit Leuven(Swepub:cth)elvire (author)
  • Decin, L.Katholieke Universiteit Leuven,Universiteit Van Amsterdam,University of Amsterdam (author)
  • Henkel, C.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Higgins, R.Maynooth University (author)
  • Jellema, W.Netherlands Institute for Space Research (SRON) (author)
  • Kraus, A.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • McCoey, C.University of Waterloo,Western University (author)
  • Melnick, G. J.Harvard-Smithsonian Center for Astrophysics (author)
  • Menten, K. M.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Risacher, C.Netherlands Institute for Space Research (SRON) (author)
  • Teyssier, D.European Space Astronomy Centre (ESAC) (author)
  • Vaillancourt, J. E.Universities Space Research Association (author)
  • Alcolea, J. (author)
  • Bujarrabal, V. (author)
  • Dominik, C.Radboud Universiteit,Radboud University,Universiteit Van Amsterdam,University of Amsterdam (author)
  • Justtanont, Kay,1965Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)justtano (author)
  • de Koter, A.Universiteit Van Amsterdam,University of Amsterdam (author)
  • Marston, A. P.European Space Astronomy Centre (ESAC) (author)
  • Olofsson, Hans,1952Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)hanolo (author)
  • Planesas, P.Atacama Large Millimeter-submillimeter Array (ALMA) (author)
  • Schmidt, M.Polish Academy of Sciences (author)
  • Schöier, Fredrik,1969Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)schoier (author)
  • Szczerba, R.Polish Academy of Sciences (author)
  • Waters, LbfmKatholieke Universiteit Leuven,Universiteit Van Amsterdam,University of Amsterdam (author)
  • Cornell UniversityWestern University (creator_code:org_t)

Related titles

  • In:Astronomy and Astrophysics: EDP Sciences521:1, s. Article Number: L51-0004-63611432-0746

Internet link

Find in a library

To the university's database

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 Close

Copy and save the link in order to return to this view