Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 433, Issue 3, Pages 2667-2692Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt947
Keywords
galaxies: clusters: individual: Coma; galaxies: elliptical and lenticular, cD; galaxies: stellar content
Categories
Funding
- European Space Agency (ESA)
- STFC Rolling Grant [PP/C501568/1]
- STFC studentship
- NSF
- University of Massachusetts
- Infrared Processing and Analysis Center/California Institute of Technology
- NASA
- National Science Foundation
- Alfred P. Sloan Foundation
- US Department of Energy Office of Science
- National Aeronautics and Space Administration
- STFC [ST/H004548/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H004548/1] Funding Source: researchfish
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We present deep Gemini Multi-Object Spectrograph long-slit spectroscopy of 15 Coma cluster S0 galaxies, and extract kinematic properties along the major axis to several times the disc scalelength. Supplementing our data set with previously published data, we create a combined sample of 29 Coma S0s, as well as a comparison sample of 38 Coma spirals. Using photometry from the Sloan Digital Sky Survey and Two Micron All Sky Survey, we construct the Tully-Fisher relation (TFR; luminosity versus maximum rotational velocity) for S0 galaxies. At fixed rotational velocity, the Coma S0 galaxies are on average fainter than Coma spirals by 1.10 +/- 0.18, 0.86 +/- 0.19 and 0.83 +/- 0.19 mag in the g, i and K-s bands, respectively. The typical S0 offsets remain unchanged when calculated relative to large field-galaxy spiral samples. The observed offsets are consistent with a simple star formation model in which S0s are identical to spirals until abrupt quenching occurs at some intermediate redshift. The offsets form a continuous distribution tracing the time since the cessation of star formation, and exhibit a strong correlation (> 6 Sigma) with residuals from the optical colour-magnitude relation. Typically, S0s which are fainter than average for their rotational velocity are also redder than average for their luminosity. The S0 TFR offset is also correlated with both the projected cluster-centric radius and the Sigma (projected) local density parameter. Since current local environment is correlated with time of accretion into the cluster, our results support a scenario in which transformation of spirals to S0s is triggered by cluster infall.
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