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Geometrical tests of cosmological models. II.Calibration of rotational widths and disc scaling relations


Saintonge, A; Masters, K L; Marinoni, C; Spekkens, K; Giovanelli, R; Haynes, M P (2008). Geometrical tests of cosmological models. II.Calibration of rotational widths and disc scaling relations. Astronomy and Astrophysics, 478(1):57-69.

Abstract

This is the second in a series of three papers dedicated to a new technique to select galaxies that can act as standard rods and standard candles in order to perform geometrical tests on large samples of high redshift galaxies to constrain different cosmological parameters. The goals of this paper are (1) to compare different rotation indicators in order to understand the relation between rotation
velocities extracted from observations of the Hαλ6563 Å line and the [OII]λ3727 Å line; and (2) to determine the scaling relations between physical size, surface brightness and magnitude of disc galaxies and their rotation velocity using the SFI++, a large catalog of nearby galaxies observed at I-band. A good correlation is observed between the rotation curve-derived velocities of the Hα and [OII]
observations, as well as between those calculated from velocity histograms, justifying the direct comparison of velocities measuredfrom Hα rotation curves in nearby galaxies and from [OII] line widths at higher redshifts. To provide calibration for the geometrical tests, we give expressions for the different scaling relations between properties of galaxies (size, surface brightness, magnitude) and their rotation speeds. We use Malmquist bias-corrected distances from the SFI++ template Tully-Fisher relation to generate a sizerotation velocity relation with unprecedentedly small scatter. We show how the best size-rotation velocity relation is derived when
size is estimated not from disc scale lengths but from the isophotal diameter r23.5, once these have been corrected for inclination and extinction effects.

This is the second in a series of three papers dedicated to a new technique to select galaxies that can act as standard rods and standard candles in order to perform geometrical tests on large samples of high redshift galaxies to constrain different cosmological parameters. The goals of this paper are (1) to compare different rotation indicators in order to understand the relation between rotation
velocities extracted from observations of the Hαλ6563 Å line and the [OII]λ3727 Å line; and (2) to determine the scaling relations between physical size, surface brightness and magnitude of disc galaxies and their rotation velocity using the SFI++, a large catalog of nearby galaxies observed at I-band. A good correlation is observed between the rotation curve-derived velocities of the Hα and [OII]
observations, as well as between those calculated from velocity histograms, justifying the direct comparison of velocities measuredfrom Hα rotation curves in nearby galaxies and from [OII] line widths at higher redshifts. To provide calibration for the geometrical tests, we give expressions for the different scaling relations between properties of galaxies (size, surface brightness, magnitude) and their rotation speeds. We use Malmquist bias-corrected distances from the SFI++ template Tully-Fisher relation to generate a sizerotation velocity relation with unprecedentedly small scatter. We show how the best size-rotation velocity relation is derived when
size is estimated not from disc scale lengths but from the isophotal diameter r23.5, once these have been corrected for inclination and extinction effects.

Citations

7 citations in Web of Science®
6 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:January 2008
Deposited On:11 Mar 2009 15:16
Last Modified:05 Apr 2016 13:06
Publisher:EDP Sciences
ISSN:0004-6361
Publisher DOI:https://doi.org/10.1051/0004-6361:20077117
Related URLs:http://arxiv.org/abs/0710.0760
Permanent URL: https://doi.org/10.5167/uzh-16570

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