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Published March 2017 | Submitted + Published
Journal Article Open

HR-COSMOS: Kinematics of star-forming galaxies at z ~ 0.9


We present the kinematic analysis of a sub-sample of 82 galaxies at 0.75 < z < 1.2 from our new survey HR-COSMOS aimed to obtain the first statistical sample to study the kinematics of star-forming galaxies in the treasury COSMOS field at 0 < z < 1.2. We observed 766 emission line galaxies using the multi-slit spectrograph ESO-VLT/VIMOS in high-resolution mode (R = 2500). To better extract galaxy kinematics, VIMOS spectral slits have been carefully tilted along the major axis orientation of the galaxies, making use of the position angle measurements from the high spatial resolution HST/ACS COSMOS images. We constrained the kinematics of the sub-sample at 0.75 < z < 1.2 by creating high-resolution semi-analytical models. We established the stellar-mass Tully-Fisher relation at z ≃ 0.9 with high-quality stellar mass measurements derived using the latest COSMOS photometric catalog, which includes the latest data releases of UltraVISTA and Spitzer. In doubling the sample at these redshifts compared with the literature, we estimated the relation without setting its slope, and found it consistent with previous studies in other deep extragalactic fields assuming no significant evolution of the relation with redshift at z ≲ 1. We computed dynamical masses within the radius R_(2.2) and found a median stellar-to-dynamical mass fraction equal to 0.2 (assuming Chabrier IMF), which implies a contribution of gas and dark matter masses of 80% of the total mass within R_(2.2), in agreement with recent integral field spectroscopy surveys. We find no dependence of the stellar-mass Tully-Fisher relation with environment probing up to group scale masses. This study shows that multi-slit galaxy surveys remain a powerful tool to derive kinematics for large numbers of galaxies at both high and low redshift.

Additional Information

© 2017 ESO. Received: 6 June 2016. Accepted: 19 September 2016. We wish to thank the ESO staff at Paranal Observatory and especially the VIMOS team at ESO for their support during observations. We thank Bodo Ziegler for useful discussion, comments, and suggestions during the preparation of the observations and Katarina Kovač for kindly providing us with their environment measurements. D.P. and L.T. wish to thank Alisson Michel and Bruno Ribeiro for their help with programming codes. We thank Marco Scodeggio for his assistance during the preparation of the observations and the data reduction. D.P. gratefully acknowledges Lori Lubin and UC Davis hospitality during the last phases of the project. We thank Alfred Tiley for providing us with their non-public measurements. This paper is based on data products from observations made with ESO Telescopes at the La Silla Paranal Observatory under ESO programme ID 179.A-2005 and on data products produced by TERAPIX and the Cambridge Astronomy Survey Unit on behalf of the UltraVISTA consortium.

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Published - aa29064-16.pdf

Submitted - 1606.01934.pdf


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