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Cosmic CARNage I: on the calibration of galaxy formation models
Knebe, Alexander,Pearce, Frazer R,Gonzalez-Perez, Violeta,Thomas, Peter A,Benson, Andrew,Asquith, Rachel,Blaizot, Jeremy,Bower, Richard,Carretero, Jorge,Castander, Francisco J,Cattaneo, Andrea,Cora, S Oxford University Press 2018 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.475 No.3
<P>We present a comparison of nine galaxy formation models, eight semi-analytical, and one halo occupation distribution model, run on the same underlying cold dark matter simulation (cosmological box of comoving width 125h(-1) Mpc, with a dark-matter particle mass of 1.24 x 10(9) h(-1)M(circle dot)) and the same merger trees. While their free parameters have been calibrated to the same observational data sets using two approaches, they nevertheless retain some 'memory' of any previous calibration that served as the starting point (especially for the manually tuned models). For the first calibration, models reproduce the observed z = 0 galaxy stellar mass function (SMF) within 3 sigma The second calibration extended the observational data to include the z = 2 SMF alongside the z similar to 0 star formation rate function, cold gas mass, and the black hole bulge mass relation. Encapsulating the observed evolution of the SMF from z = 2 to 0 is found to be very hard within the context of the physics currently included in the models. We finally use our calibrated models to study the evolution of the stellar-to-halo mass (SHM) ratio. For all models, we find that the peak value of the SHM relation decreases with redshift. However, the trends seen for the evolution of the peak position as well as the mean scatter in the SHM relation are rather weak and strongly model dependent. Both the calibration data sets and model results are publicly available.</P>
nIFTy cosmology: comparison of galaxy formation models
Knebe, Alexander,Pearce, Frazer R.,Thomas, Peter A.,Benson, Andrew,Blaizot, Jeremy,Bower, Richard,Carretero, Jorge,Castander, Francisco J.,Cattaneo, Andrea,Cora, Sofia A.,Croton, Darren J.,Cui, Weigua Oxford University Press 2015 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.451 No.4
Haloes at the ragged edge: the importance of the splashback radius
Snaith, O. N.,Bailin, J.,Knebe, A.,Stinson, G.,Wadsley, J.,Couchman, H. Oxford University Press 2017 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.472 No.3
<P>We have explored the outskirts of dark matter haloes out to 2.5 times the virial radius using a large sample of haloes drawn from Illustris, along with a set of zoom simulations (MUGS). Using these, we make a systematic exploration of the shape profile beyond Rvir. In the mean sphericity profile of Illustris haloes, we identify a dip close to the virial radius, which is robust across a broad range of masses and infall rates. The inner edge of this feature may be related to the virial radius and the outer edge with the splashback radius. Due to the high halo-to-halo variation, this result is visible only on average. However, in four individual haloes in the MUGS sample, a decrease in the sphericity and a subsequent recovery is evident close to the splashback radius. We find that this feature persists for several Gyr, growing with the halo. This feature appears at the interface between the spherical halo density distribution and the filamentary structure in the environment. The shape feature is strongest when there is a high rate of infall, implying that the effect is due to the mixing of accreting and virializing material. The filamentary velocity field becomes rapidlymixed in the halo region inside the virial radius, with the area between this and the splashback radius serving as the transition region. We also identify a long-lasting and smoothly evolving splashback region in the radial density gradient in many of the MUGS haloes.</P>
The sensitivity of harassment to orbit: mass loss from early-type dwarfs in galaxy clusters
Smith, R.,Sá,nchez-Janssen, R.,Beasley, M. A.,Candlish, G. N.,Gibson, B. K.,Puzia, T. H.,Janz, J.,Knebe, A.,Aguerri, J. A. L.,Lisker, T.,Hensler, G.,Fellhauer, M.,Ferrarese, L.,Yi, S. K. Oxford University Press 2015 Monthly notices of the Royal Astronomical Society Vol.454 No.3