On the detection of artefacts in spectro-astrometry

E. Brannigan*, M. Takami, A. Chrysostomou, J. Bailey

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

ABSTRACT We demonstrate that artificial bipolar structure can be detected using spectro-astrometry when the point spread function (PSF) of a point source suffers distortion in a relatively wide slit. Spectro-astrometry is a technique which allows us to probe the spatial structure of astronomical sources on milliarcsec (mas) scales making it possible to detect close binaries and to study the geometry and kinematics of outflowing gas on scales much smaller than the seeing or the diffraction limit of the telescope. It is demonstrated that a distorted PSF, caused by tracking errors of the telescope or unstable active optics during an exposure, can induce artificial signals which may be misinterpreted as a real spectro-astrometric signal. Using simulations, we show that these may be minimized by using a narrow slit relative to the seeing. Spectra should be obtained at antiparallel slit position angles (e.g. 0°and 180°) for comparison in order to allow artificial signatures to be identified.

Original languageEnglish
Pages (from-to)315-322
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume367
Issue number1
DOIs
Publication statusPublished - Mar 2006

Keywords

  • ISM: jets and outflows
  • Line: formation
  • Line: profiles
  • Stars: pre-main-sequence

Fingerprint

Dive into the research topics of 'On the detection of artefacts in spectro-astrometry'. Together they form a unique fingerprint.

Cite this