The KMOS Cluster Survey (KCS). I. The fundamental plane and the formation ages of cluster galaxies at redshift 1.4 < Z < 1.6
The American Astronomical Society. All rights reserved. We present the analysis of the fundamental plane (FP) for a sample of 19 massive red-sequence galaxies (M· > ×4 10 10 M·) in three known overdensities at 1.39 1.61 < < z from the K-band Multi-object Spectrograph (KM...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Journal article |
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American Astronomical Society
2017
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| _version_ | 1826291757931823104 |
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| author | Beifiori, A Mendel, J Chan, J Saglia, R Bender, R Cappellari, M Davies, R Galametz, A Houghton, R Prichard, L Smith, R Stott, J Wilman, D Lewis, I Sharples, R Wegner, M |
| author_facet | Beifiori, A Mendel, J Chan, J Saglia, R Bender, R Cappellari, M Davies, R Galametz, A Houghton, R Prichard, L Smith, R Stott, J Wilman, D Lewis, I Sharples, R Wegner, M |
| author_sort | Beifiori, A |
| collection | OXFORD |
| description | The American Astronomical Society. All rights reserved. We present the analysis of the fundamental plane (FP) for a sample of 19 massive red-sequence galaxies (M· > ×4 10 10 M·) in three known overdensities at 1.39 1.61 < < z from the K-band Multi-object Spectrograph (KMOS) Cluster Survey, a guaranteed-time program with spectroscopy from the KMOS at the VLT and imaging from the Hubble Space Telescope. As expected, we find that the FP zero-point in B band evolves with redshift, from the value 0.443 of Coma to -0.10±0.09, -0.19±0.05, and -0.29±0.12 for our clusters at z = 1.39, z = 1.46, and z = 1.61, respectively. For the most massive galaxies (log 1 M M· > 1) in our sample, we translate the FP zero-point evolution into a mass-to-light-ratio M/L evolution, finding D log 0.46 0.10 M L z B = - (D log )0.52 0.07 M L z B = -to(D log ) 0.55 0.10 M L z B = - respectively. We assess the potential contribution of the galaxy structural and stellar velocity dispersion evolution to the evolution of the FP zero-point and find it to be ∼6%-35% of the FP zero-point evolution. The rate of M/L evolution is consistent with galaxies evolving passively. Using single stellar population models, we find an average age of 2.33- +0.51 0.86 Gyr for the log 1 M M· > 1 galaxies in our massive and virialized cluster at z = 1.39,1.59- +0.62 1.40 Gyr in a massive but not virialized cluster at z = 1.46, and 1.20- +0.47 1.03 Gyr in a protocluster at z = 1.61. After accounting for the difference in the age of the universe between redshifts, the ages of the galaxies in the three overdensities are consistent within the errors, with possibly a weak suggestion that galaxies in the most evolved structure are older. |
| first_indexed | 2024-03-07T03:04:15Z |
| format | Journal article |
| id | oxford-uuid:b1f80183-5f60-49cf-8c3d-6ef23837955e |
| institution | University of Oxford |
| last_indexed | 2024-03-07T03:04:15Z |
| publishDate | 2017 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | oxford-uuid:b1f80183-5f60-49cf-8c3d-6ef23837955e2022-03-27T04:08:11ZThe KMOS Cluster Survey (KCS). I. The fundamental plane and the formation ages of cluster galaxies at redshift 1.4 < Z < 1.6Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b1f80183-5f60-49cf-8c3d-6ef23837955eSymplectic Elements at OxfordAmerican Astronomical Society2017Beifiori, AMendel, JChan, JSaglia, RBender, RCappellari, MDavies, RGalametz, AHoughton, RPrichard, LSmith, RStott, JWilman, DLewis, ISharples, RWegner, M The American Astronomical Society. All rights reserved. We present the analysis of the fundamental plane (FP) for a sample of 19 massive red-sequence galaxies (M· > ×4 10 10 M·) in three known overdensities at 1.39 1.61 < < z from the K-band Multi-object Spectrograph (KMOS) Cluster Survey, a guaranteed-time program with spectroscopy from the KMOS at the VLT and imaging from the Hubble Space Telescope. As expected, we find that the FP zero-point in B band evolves with redshift, from the value 0.443 of Coma to -0.10±0.09, -0.19±0.05, and -0.29±0.12 for our clusters at z = 1.39, z = 1.46, and z = 1.61, respectively. For the most massive galaxies (log 1 M M· > 1) in our sample, we translate the FP zero-point evolution into a mass-to-light-ratio M/L evolution, finding D log 0.46 0.10 M L z B = - (D log )0.52 0.07 M L z B = -to(D log ) 0.55 0.10 M L z B = - respectively. We assess the potential contribution of the galaxy structural and stellar velocity dispersion evolution to the evolution of the FP zero-point and find it to be ∼6%-35% of the FP zero-point evolution. The rate of M/L evolution is consistent with galaxies evolving passively. Using single stellar population models, we find an average age of 2.33- +0.51 0.86 Gyr for the log 1 M M· > 1 galaxies in our massive and virialized cluster at z = 1.39,1.59- +0.62 1.40 Gyr in a massive but not virialized cluster at z = 1.46, and 1.20- +0.47 1.03 Gyr in a protocluster at z = 1.61. After accounting for the difference in the age of the universe between redshifts, the ages of the galaxies in the three overdensities are consistent within the errors, with possibly a weak suggestion that galaxies in the most evolved structure are older. |
| spellingShingle | Beifiori, A Mendel, J Chan, J Saglia, R Bender, R Cappellari, M Davies, R Galametz, A Houghton, R Prichard, L Smith, R Stott, J Wilman, D Lewis, I Sharples, R Wegner, M The KMOS Cluster Survey (KCS). I. The fundamental plane and the formation ages of cluster galaxies at redshift 1.4 < Z < 1.6 |
| title | The KMOS Cluster Survey (KCS). I. The fundamental plane and the formation ages of cluster galaxies at redshift 1.4 < Z < 1.6 |
| title_full | The KMOS Cluster Survey (KCS). I. The fundamental plane and the formation ages of cluster galaxies at redshift 1.4 < Z < 1.6 |
| title_fullStr | The KMOS Cluster Survey (KCS). I. The fundamental plane and the formation ages of cluster galaxies at redshift 1.4 < Z < 1.6 |
| title_full_unstemmed | The KMOS Cluster Survey (KCS). I. The fundamental plane and the formation ages of cluster galaxies at redshift 1.4 < Z < 1.6 |
| title_short | The KMOS Cluster Survey (KCS). I. The fundamental plane and the formation ages of cluster galaxies at redshift 1.4 < Z < 1.6 |
| title_sort | kmos cluster survey kcs i the fundamental plane and the formation ages of cluster galaxies at redshift 1 4 lt z lt 1 6 |
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