SwePub
Sök i LIBRIS databas

  Extended search

id:"swepub:oai:DiVA.org:su-121681"
 

Search: id:"swepub:oai:DiVA.org:su-121681" > Polarization leakag...

  • 1 of 1
  • Previous record
  • Next record
  •    To hitlist
  • Asad, K. M. B. (author)

Polarization leakage in epoch of reionization windows - I. Low Frequency Array observations of the 3C196 field

  • Article/chapterEnglish2015

Publisher, publication year, extent ...

  • 2015-06-29
  • Oxford University Press (OUP),2015
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-121681
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-121681URI
  • https://doi.org/10.1093/mnras/stv1107DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

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

Notes

  • Detection of the 21-cm signal coming from the epoch of reionization (EoR) is challenging especially because, even after removing the foregrounds, the residual Stokes I maps contain leakage from polarized emission that can mimic the signal. Here, we discuss the instrumental polarization of Low Frequency Array (LOFAR) and present realistic simulations of the leakages between Stokes parameters. From the LOFAR observations of polarized emission in the 3C196 field, we have quantified the level of polarization leakage caused by the nominal model beam of LOFAR, and compared it with the EoR signal using power spectrum analysis. We found that at 134-166 MHz, within the central 4A degrees of the field the (Q, U) -> I leakage power is lower than the EoR signal at k < 0.3 Mpc(-1). The leakage was found to be localized around a Faraday depth of 0, and the rms of the leakage as a fraction of the rms of the polarized emission was shown to vary between 0.2 and 0.3 per cent, both of which could be utilized in the removal of leakage. Moreover, we could define an 'EoR window' in terms of the polarization leakage in the cylindrical power spectrum above the point spread function (PSF)-induced wedge and below k(ayen) similar to 0.5 Mpc(-1), and the window extended up to k(ayen) similar to 1 Mpc(-1) at all k(aSyen) when 70 per cent of the leakage had been removed. These LOFAR results show that even a modest polarimetric calibration over a field of view of a parts per thousand(2) 4A degrees in the future arrays like Square Kilometre Array will ensure that the polarization leakage remains well below the expected EoR signal at the scales of 0.02-1 Mpc(-1).

Subject headings and genre

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

  • Koopmans, L. V. E. (author)
  • Jelic, V. (author)
  • Pandey, V. N. (author)
  • Ghosh, A. (author)
  • Abdalla, F. B. (author)
  • Bernardi, G. (author)
  • Brentjens, M. A. (author)
  • de Bruyn, A. G. (author)
  • Bus, S. (author)
  • Ciardi, B. (author)
  • Chapman, E. (author)
  • Daiboo, S. (author)
  • Fernandez, E. R. (author)
  • Harker, G. (author)
  • Iliev, I. T. (author)
  • Jensen, HannesStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)hjens (author)
  • Martinez-Rubi, O. (author)
  • Mellema, GarreltStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)gmell (author)
  • Mevius, M. (author)
  • Offringa, A. R. (author)
  • Patil, A. H. (author)
  • Schaye, J. (author)
  • Thomas, R. M. (author)
  • van der Tol, S. (author)
  • Vedantham, H. K. (author)
  • Yatawatta, S. (author)
  • Zaroubi, S. (author)
  • Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

Related titles

  • In:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)451:4, s. 3709-37270035-87111365-2966

Internet link

Find in a library

To the university's database

  • 1 of 1
  • Previous record
  • Next record
  •    To hitlist

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