NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-17 T12:00:33 PDT
Help | Comment | NED Home

For refcode 2014A&A...567A..61S:
Retrieve 34 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
2014A&A...567A..61S A simple model for global H I profiles of galaxies Stewart, I. M.; Blyth, S.-L.; de Blok, W. J. G. Abstract. Context. Current and future blind surveys for H I generate large catalogs of spectral lines for which automated characterisation would be convenient. Aims: A 6-parameter mathematical model for H I galactic spectral lines is described. The aim of the paper is to show that this model is indeed a useful way to characterise such lines. Methods: The model is fitted to spectral lines extracted for the 34 spiral galaxies of the recent high-definition THINGS survey. Three scenarios with different instrumental characteristics are compared. Quantities obtained from the model fits, most importantly line width and total flux, are compared with analog quantities measured in more standard, non-parametric ways. Results: The model is shown to be a good fit to nearly all the THINGS profiles. When extra noise is added to the test spectra, the fits remain consistent; the model-fitting approach is also shown to return superior estimates of linewidth and flux under such conditions. Key words: line: profiles, methods: data analysis, methods: numerical, radio lines: galaxies
Retrieve 34 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home