We study the dependence of fragmentation in massive gas-rich galaxy disks at z > 1 on stellar feedback schemes and hydrodynamical solvers, employing the GASOLINE2 SPH code and the lagrangian mesh-less code GIZMO in finite mass mode. Non-cosmological galaxy disk runs with the standard delayed-cooling blastwave feedback are compared with runs adopting a new superbubble feedback, which produces winds by modeling the detailed physics of supernova-driven bubbles and leads to efficient self-regulation of star formation. We find that, with blastwave feedback, massive star-forming clumps form in comparable number and with very similar masses in GASOLINE2 and GIZMO. Typical clump masses are in the range 107-108 M o, lower than in most previous works, while giant clumps with masses above 109 M o are exceedingly rare. By contrast, superbubble feedback does not produce massive star-forming bound clumps as galaxies never undergo a phase of violent disk instability. In this scheme, only sporadic, unbound star-forming overdensities lasting a few tens of Myr can arise, triggered by non-linear perturbations from massive satellite companions. We conclude that there is severe tension between explaining massive star-forming clumps observed at z > 1 primarily as the result of disk fragmentation driven by gravitational instability and the prevailing view of feedback-regulated galaxy formation. The link between disk stability and star formation efficiency should thus be regarded as a key testing ground for galaxy formation theory.
Mayer, L., Tamburello, V., Lupi, A., Keller, B., Wadsley, J., & Madau, P. (2016). CLUMPY DISKS AS A TESTBED for FEEDBACK-REGULATED GALAXY FORMATION. THE ASTROPHYSICAL JOURNAL LETTERS, 830(1).
|Citazione:||Mayer, L., Tamburello, V., Lupi, A., Keller, B., Wadsley, J., & Madau, P. (2016). CLUMPY DISKS AS A TESTBED for FEEDBACK-REGULATED GALAXY FORMATION. THE ASTROPHYSICAL JOURNAL LETTERS, 830(1).|
|Tipo:||Articolo in rivista - Articolo scientifico|
|Carattere della pubblicazione:||Scientifica|
|Presenza di un coautore afferente ad Istituzioni straniere:||Si|
|Titolo:||CLUMPY DISKS AS A TESTBED for FEEDBACK-REGULATED GALAXY FORMATION|
|Autori:||Mayer, L; Tamburello, V; Lupi, A; Keller, B; Wadsley, J; Madau, P|
|Data di pubblicazione:||2016|
|Rivista:||THE ASTROPHYSICAL JOURNAL LETTERS|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.3847/2041-8205/830/1/L13|
|Appare nelle tipologie:||01 - Articolo su rivista|