GEMS: The Size Evolution of Disk Galaxies
We combine HST imaging from the GEMS survey with photometric redshifts from COMBO-17 to explore the evolution of disk-dominated galaxies since z<1.1. The sample is comprised of all GEMS galaxies with Sersic indices n<2.5, derived from fits to the galaxy images. We account fully for sel...
| Główni autorzy: | , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Wydane: |
2005
|
| _version_ | 1826297514127523840 |
|---|---|
| author | Barden, M Rix, H Somerville, R Bell, E Haeussler, B Peng, C Borch, A Beckwith, S Caldwell, J Heymans, C Jahnke, K Jogee, S McIntosh, D Meisenheimer, K Sanchez, S Wisotzki, L Wolf, C |
| author_facet | Barden, M Rix, H Somerville, R Bell, E Haeussler, B Peng, C Borch, A Beckwith, S Caldwell, J Heymans, C Jahnke, K Jogee, S McIntosh, D Meisenheimer, K Sanchez, S Wisotzki, L Wolf, C |
| author_sort | Barden, M |
| collection | OXFORD |
| description | We combine HST imaging from the GEMS survey with photometric redshifts from COMBO-17 to explore the evolution of disk-dominated galaxies since z<1.1. The sample is comprised of all GEMS galaxies with Sersic indices n<2.5, derived from fits to the galaxy images. We account fully for selection effects through careful analysis of image simulations; we are limited by the depth of the redshift and HST data to the study of galaxies with absolute magnitudes M(V)<-20, or equivalently stellar masses log(M)>10. We find strong evolution in the magnitude-size scaling relation for galaxies with M(V)<-20, corresponding to a brightening of 1 mag per sqarcsec in rest-frame V-band by z=1. Yet, disks at a given absolute magnitude are bluer and have lower stellar mass-to-light ratios at z=1 than at the present day. As a result, our findings indicate weak or no evolution in the relation between stellar mass and effective disk size for galaxies with log(M)>10 over the same time interval. This is strongly inconsistent with the most naive theoretical expectation, in which disk size scales in proportion to the halo virial radius, which would predict that disks are a factor of two denser at fixed mass at z=1. The lack of evolution in the stellar mass-size relation is consistent with an ``inside-out'' growth of galaxy disks on average (galaxies increasing in size as they grow more massive), although we cannot rule out more complex evolutionary scenarios. |
| first_indexed | 2024-03-07T04:32:48Z |
| format | Journal article |
| id | oxford-uuid:cee6f1d5-97ce-4fb3-a48e-d0fc500f6a1c |
| institution | University of Oxford |
| last_indexed | 2024-03-07T04:32:48Z |
| publishDate | 2005 |
| record_format | dspace |
| spelling | oxford-uuid:cee6f1d5-97ce-4fb3-a48e-d0fc500f6a1c2022-03-27T07:38:43ZGEMS: The Size Evolution of Disk GalaxiesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:cee6f1d5-97ce-4fb3-a48e-d0fc500f6a1cSymplectic Elements at Oxford2005Barden, MRix, HSomerville, RBell, EHaeussler, BPeng, CBorch, ABeckwith, SCaldwell, JHeymans, CJahnke, KJogee, SMcIntosh, DMeisenheimer, KSanchez, SWisotzki, LWolf, CWe combine HST imaging from the GEMS survey with photometric redshifts from COMBO-17 to explore the evolution of disk-dominated galaxies since z<1.1. The sample is comprised of all GEMS galaxies with Sersic indices n<2.5, derived from fits to the galaxy images. We account fully for selection effects through careful analysis of image simulations; we are limited by the depth of the redshift and HST data to the study of galaxies with absolute magnitudes M(V)<-20, or equivalently stellar masses log(M)>10. We find strong evolution in the magnitude-size scaling relation for galaxies with M(V)<-20, corresponding to a brightening of 1 mag per sqarcsec in rest-frame V-band by z=1. Yet, disks at a given absolute magnitude are bluer and have lower stellar mass-to-light ratios at z=1 than at the present day. As a result, our findings indicate weak or no evolution in the relation between stellar mass and effective disk size for galaxies with log(M)>10 over the same time interval. This is strongly inconsistent with the most naive theoretical expectation, in which disk size scales in proportion to the halo virial radius, which would predict that disks are a factor of two denser at fixed mass at z=1. The lack of evolution in the stellar mass-size relation is consistent with an ``inside-out'' growth of galaxy disks on average (galaxies increasing in size as they grow more massive), although we cannot rule out more complex evolutionary scenarios. |
| spellingShingle | Barden, M Rix, H Somerville, R Bell, E Haeussler, B Peng, C Borch, A Beckwith, S Caldwell, J Heymans, C Jahnke, K Jogee, S McIntosh, D Meisenheimer, K Sanchez, S Wisotzki, L Wolf, C GEMS: The Size Evolution of Disk Galaxies |
| title | GEMS: The Size Evolution of Disk Galaxies |
| title_full | GEMS: The Size Evolution of Disk Galaxies |
| title_fullStr | GEMS: The Size Evolution of Disk Galaxies |
| title_full_unstemmed | GEMS: The Size Evolution of Disk Galaxies |
| title_short | GEMS: The Size Evolution of Disk Galaxies |
| title_sort | gems the size evolution of disk galaxies |
| work_keys_str_mv | AT bardenm gemsthesizeevolutionofdiskgalaxies AT rixh gemsthesizeevolutionofdiskgalaxies AT somerviller gemsthesizeevolutionofdiskgalaxies AT belle gemsthesizeevolutionofdiskgalaxies AT haeusslerb gemsthesizeevolutionofdiskgalaxies AT pengc gemsthesizeevolutionofdiskgalaxies AT borcha gemsthesizeevolutionofdiskgalaxies AT beckwiths gemsthesizeevolutionofdiskgalaxies AT caldwellj gemsthesizeevolutionofdiskgalaxies AT heymansc gemsthesizeevolutionofdiskgalaxies AT jahnkek gemsthesizeevolutionofdiskgalaxies AT jogees gemsthesizeevolutionofdiskgalaxies AT mcintoshd gemsthesizeevolutionofdiskgalaxies AT meisenheimerk gemsthesizeevolutionofdiskgalaxies AT sanchezs gemsthesizeevolutionofdiskgalaxies AT wisotzkil gemsthesizeevolutionofdiskgalaxies AT wolfc gemsthesizeevolutionofdiskgalaxies |