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Galaxies under the cosmic microscope: resolved spectroscopy and new constraints on the z = 1 Tully–Fisher relation

Swinbank, A. M. and Bower, R. G. and Smith, Graham P. and Smail, Ian and Kneib, J.-P. and Ellis, R. S. and Stark, D. P. and Bunker, A. J. (2006) Galaxies under the cosmic microscope: resolved spectroscopy and new constraints on the z = 1 Tully–Fisher relation. Monthly Notices of the Royal Astronomical Society, 368 (4). pp. 1631-1645. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20110721-094749192

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Abstract

We exploit the gravitational potential of massive cluster lenses to probe the emission-line properties of six z = 1 galaxies which appear as highly magnified luminous arcs. Using the Gemini Multi-Object Spectrograph (GMOS) integral field spectrograph together with detailed cluster lens models, we reconstruct the intrinsic morphologies and two-dimensional velocity fields in these galaxies on scales corresponds to ~0.5 kpc (unlensed) at z = 1. Four of the galaxies have stable disc-like kinematics, whilst the other two resemble interacting or starburst galaxies. These galaxies lie close to the mean rest-frame I-band Tully–Fisher relation for nearby spirals suggesting a clear preference for hierarchical growth of structure. In the rest-frame B band, the observations suggest 0.5 ± 0.3 mag of brightening, consistent with increased star-formation activity at z = 1. However, the galaxies with stable disc kinematics have more slowly rising rotation curves than expected from galaxies with similar surface brightness in the local Universe. We suggest that this may arise because the distant galaxies have lower bulge masses than their local counterparts. Whilst this study is based on only six galaxies, the gain in flux and in spatial resolution achieved via gravitational magnification provides a much more detailed view of the high-redshift Universe than that possible with conventional surveys.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1111/j.1365-2966.2006.10273.xDOIArticle
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2966.2006.10273.x/abstractPublisherArticle
ORCID:
AuthorORCID
Smith, Graham P.0000-0003-4494-8277
Smail, Ian0000-0003-3037-257X
Kneib, J.-P.0000-0002-4616-4989
Ellis, R. S.0000-0001-7782-7071
Additional Information:© 2006 The Authors. Journal compilation © 2006 RAS. Accepted 2006 March 2. Received 2006 February 28; in original form 2005 September 30. We are very grateful to the anonymous referee for providing a number of suggestions which significantly improved the content, layout and clarity of this paper. We would like to thank Kari Nilsson for allowing us to use his BVRI imaging data of RGB1745+398, and Alastair Edge, John Lucey, Chris Simpson and Russel Smith for useful discussions. We would also like to thank the Gemini-North staff who observed our targets in queue mode in 2003A. GPS thanks Phil Marshall and Keren Sharon for assistance with the Keck/LRIS observations and David Sand for assistance with the Hale/WIRC observations. GPS also acknowledges the Caltech Optical Observatories TAC for enthusiastically supporting his program of galaxy cluster observations. AMS acknowledges support from a PPARC Fellowship, RGB acknowledges a PPARC Senior Fellowship, GPS acknowledges support from Caltech and a Royal Society University Research Fellowship, IRS acknowledges support from the Royal Society and JPK thanks support from CNRS and Caltech for their support.
Funders:
Funding AgencyGrant Number
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
CaltechUNSPECIFIED
Royal SocietyUNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Subject Keywords:gravitational lensing; galaxies: evolution; galaxies: high-redshift; galaxies: individual: kinematics and dynamics
Issue or Number:4
Record Number:CaltechAUTHORS:20110721-094749192
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20110721-094749192
Official Citation:Swinbank, A. M., Bower, R. G., Smith, G. P., Smail, I., Kneib, J.-P., Ellis, R. S., Stark, D. P. and Bunker, A. J. (2006), Galaxies under the cosmic microscope: resolved spectroscopy and new constraints on the z= 1 Tully–Fisher relation. Monthly Notices of the Royal Astronomical Society, 368: 1631–1645. doi: 10.1111/j.1365-2966.2006.10273.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24488
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:21 Jul 2011 20:24
Last Modified:16 Nov 2019 00:51

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