Scaling Relations in Dissipationless Spiral-like Galaxy Mergers - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: We determine both representations of the Fundamental Plane Re Sig^a Ie^b andRe Sig^2-Ie^lambda and the luminosity-effective phase space density Lfe^-gamma scaling relation for N-body remnants of binary mergers ofspiral-like galaxies. The main set of merger simulations involves a mass-ratioof the progenitors in the range of about 1:1 to 1:5, harboring or not abulge-like component, and are constructed using a cosmological motivated model.Equal-mass mergers are also considered. Remnants lead to average values for thescaling indices of ~1.6, ~0.6, ~0.7, and ~0.65. Thesevalues are consistent with those of K-band observations Mobasher et al. 1999of ellipticals: ~1.5, ~0.8, ~0.7, and ~0.60. The b indexis, however, not well reproduced. This study does not allow us to establish aconclusive preference for models with or without a bulge as progenitors. Ourresults indicate that the L-fe and FP scalings might be determined to a largeextent by dissipationless processes, a result that appears to be incontradiction to other dissipationless results.



Autor: H. Aceves, H. Velazquez, F. Cruz

Fuente: https://arxiv.org/





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