posted on 2024-08-06, 11:50authored byNicholas Scott, Jesse van de Sande, Scott M. Croom, Brent Groves, Matt S. Owers, Henry Poetrodjojo, Francesco D'Eugenio, Anne M. Medling, Dilyar Barat, Tania M. Barone, Joss Bland-Hawthorn, Sarah Brough, Julia Bryant, Luca Cortese, Caroline Foster, Andrew W. Green, Sree Oh, Matthew Colless, Michael J. Drinkwater, Simon P. Driver, Michael Goodwin, Madusha L.P. Gunawardhana, Christoph Federrath, Lloyd Harischandra, Yifei Jin, J. S. Lawrence, Nuria P. Lorente, Elizabeth Mannering, Simon O'Toole, Samuel N. Richards, Sebastian F. Sanchez, Adam L. Schaefer, Katrina Sealey, Rob Sharp, Sarah Sweet, Dan S. Taranu, Mathew Varidel
We present the second major release of data from the Sydney - Australian Astronomical Observatory Multi-Object Integral Field Spectrograph (SAMI) Galaxy Survey. Data Release Two includes data for 1559 galaxies, about 50 per cent of the full survey. Galaxies included have a redshift range 0.004 < z < 0.113 and a large stellar mass range 7.5 < log (M-*/M-circle dot) < 11.6. The core data for each galaxy consist of two primary spectral cubes covering the blue and red optical wavelength ranges. For each primary cube, we also provide three spatially binned spectral cubes and a set of standardized aperture spectra. For each core data product, we provide a set of value-added data products. This includes all emission line value-added products from Data Release One, expanded to the larger sample. In addition, we include stellar kinematic and stellar population value-added products derived from absorption line measurements. The data are provided online through Australian Astronomical Optics' Data Central. We illustrate the potential of this release by presenting the distribution of similar to 350 000 stellar velocity dispersion measurements from individual spaxels as a function of R/R e , divided in four galaxy mass bins. In the highest stellar mass bin [log (M-*/M-circle dot) > 11], the velocity dispersion strongly increases towards the centre, whereas below log (M-*/M-circle dot) < 10 we find no evidence for a clear increase in the central velocity dispersion. This suggests a transition mass around log (M-*/M-circle dot) similar to 10 for galaxies with or without a dispersion-dominated bulge.
Funding
Hector: a revolutionary survey machine to discover how galaxies formed
The impact of impact: what stops star formation in cluster galaxies? This project aims to explain the fundamental differences observed in the star forming properties of galaxies in high and low density environments