2006A&A...450...25V


Query : 2006A&A...450...25V

2006A&A...450...25V - Astronomy and Astrophysics, volume 450, 25-37 (2006/4-4)

On measuring the Tully-Fisher relation at z>1. A case study using strong Hα emitting galaxies at z>1.5.

VAN STARKENBURG L., VAN DER WERF P.P., YAN L. and MOORWOOD A.F.M.

Abstract (from CDS):

The evolution of the line width - luminosity relation for spiral galaxies, the Tully-Fisher relation, strongly constrains galaxy formation and evolution models. At this moment, the kinematics of z>1 spiral galaxies can only be measured using rest frame optical emission lines associated with star formation, such as Hα and [OIII]5007/4959 and [OII]3727. This method has intrinsic difficulties and uncertainties. Moreover, observations of these lines are challenging for present day telescopes and techniques. Here, we present an overview of the intrinsic and observational challenges and some ways way to circumvent them. We illustrate our results with the HST/NICMOS grism sample data of z∼1.5 starburst galaxies. The number of galaxies we can use in the final Tully-Fisher analysis is only three. We find a ∼2mag offset from the local rest frame B and R band Tully-Fisher relation for this sample. This offset is partially explained by sample selection effects and sample specifics. Uncertainties in inclination and extinction and the effects of star formation on the luminosity can be accounted for. The largest remaining uncertainty is the line width/ rotation curve velocity measurement. We show that high resolution, excellent seeing integral field spectroscopy will improve the situation. However, we note that no flat rotation curves have been observed for galaxies with z>1. This could be due to the described instrumental and observational limitations, but it might also mean that galaxies at z>1 have not reached the organised motions of the present day.

Abstract Copyright:

Journal keyword(s): galaxies: starburst - galaxies: high-redshift - galaxies: kinematics and dynamics - galaxies: evolution

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 [MYF99] J0627-6512 a EmG 06 27 32.20 -65 12 35.0           ~ 3 0
2 [MYF99] J0738+0507 a EmG 07 38 57.86 +05 07 35.2           ~ 3 0
3 [MYF99] J0738+0507 b EmG 07 38 58.37 +05 07 56.7           ~ 2 0
4 [MYF99] J0931-0449 a AGN 09 31 26.0 -04 49 45           ~ 5 0
5 [MYF99] J1056-0337 a EmG 10 56 56.41 -03 37 03.9           ~ 3 0
6 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 454 0
7 [MYF99] J1120+2323 a EmG 11 20 24.29 +23 22 40.8           ~ 5 0
8 [MYF99] J1143-8036 c EmG 11 43 10.31 -80 37 06.9           ~ 2 0
9 [MYF99] J1143-8036 d EmG 11 43 18.46 -80 36 30.2           ~ 2 0
10 [MYF99] J1143-8036 a EmG 11 43 19.56 -80 36 46.2           ~ 4 0
11 [MYF99] J1143-8036 b EmG 11 43 19.73 -80 36 46.9           ~ 3 0
12 NAME Ursa Major Cluster ClG 15 08.8 +67 07           ~ 409 0

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