ATTENZIONE! IL REPOSITORY E’ APERTO ESCLUSIVAMENTE ALL’IMMISSIONE DEI RAPPORTI TECNICI (COLLEZIONE 4.01). NON E’ POSSIBILE INSERIRE PRODOTTI IN TUTTE LE ALTRE COLLEZIONI, A CAUSA DI PROBLEMI TECNICI. THE REPOSITORY IS OPEN EXCLUSIVELY FOR THE SUBMISSION OF TECHNICAL REPORTS (COLLECTION 4.01). SUBMISSIONS TO ALL OTHER COLLECTIONS ARE TEMPORARILY UNAVAILABLE, DUE TO TECHNICAL ISSUES.
 

The rate and luminosity function of long gamma ray bursts

Journal
Date Issued
2016
Author(s)
Pescalli, A.
•
•
•
•
Vergani, S. D.
•
Nappo, F.
•
•
•
•
Götz, D.
DOI
Abstract
We derive, adopting a direct method, the luminosity function and the formation rate of long Gamma Ray Bursts through a complete, flux-limited, sample of Swift bursts which has a high level of completeness in redshift z (~82%). We parametrise the redshift evolution of the GRB luminosity as L = L0(1 + z)k and we derive k = 2.5, consistently with recent estimates. The de-evolved luminosity function φ(L0) of GRBs can be represented by a broken power law with slopes a = -1.32 ± 0.21 and b = -1.84 ± 0.24 below and above, respectively, a break luminosity L0,b = 1051.45±0.15 erg/s. Under the hypothesis of luminosity evolution we find that the GRB formation rate increases with redshift up to z ~ 2, where it peaks, and then decreases in agreement with the shape of the cosmic star formation rate. We test the direct method through numerical simulations and we show that if it is applied to incomplete (both in redshift and/or flux) GRB samples it can misleadingly result in an excess of the GRB formation rate at low redshifts.
Volume
587
Start page
A40
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2016A&A...587A..40P
Rights
open.access
File(s)
Loading...
Thumbnail Image
Name

1506.05463.pdf

Description
postprint
Size

331.34 KB

Format

Adobe PDF

Checksum (MD5)

30c333c20cf102da501271637118de41

Loading...
Thumbnail Image
Name

aa26760-15.pdf

Description
PDF editoriale
Size

606.75 KB

Format

Adobe PDF

Checksum (MD5)

cf5cee38f2553c858b8a71e9bc5694ec