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Is there a link between the luminosity function and the duration distribution of collapsar GRBs?

Τετάρτη 13 Σεπτεμβρίου 2017, 13:00-14:00

ΣΧΟΛΗ ΘΕΤΙΚΩΝ ΕΠΙΣΤΗΜΩΝ ΕΚΠΑ
ΤΜΗΜΑ ΦΥΣΙΚΗΣ
ΤΟΜΕΑΣ ΑΣΤΡΟΦΥΣΙΚΗΣ AΣΤΡΟΝΟΜΙΑΣ ΚΑΙ ΜΗΧΑΝΙΚΗΣ

Σ Ε Μ Ι Ν Α Ρ Ι Ο

Τετάρτη 13 Σεπτεμβρίου 2017, 13:00-14:00
Αίθουσα Διαλέξεων Τομέα Αστροφυσικής, Αστρονομίας και Μηχανικής

Is there a link between the luminosity function and the duration distribution of collapsar GRBs?
Δρ Μαρία Πετροπούλου
Princeton University

Jets in long-duration gamma-ray bursts (GRBs) have to drill through the collapsing star in order to break out of it and produce the gamma-ray signal while the central engine is still active. If the breakout time is shorter for more powerful engines, then the jet-collapsar interaction acts as a filter of less luminous jets. I will show that the observed broken power-law GRB luminosity function is a natural outcome of this process. For a theoretically motivated breakout time that scales with the jet luminosity as L-1/3 or L-1/2, the shape of the gamma-ray duration distribution can be uniquely determined by the GRB luminosity function and matches the observed one. I will also discuss the interesting implications of our analysis about the supernova-central engine connection.