A COMPLETE SAMPLE OF BRIGHT SWIFT LONG GAMMA-RAY BURSTS. I. SAMPLE PRESENTATION, LUMINOSITY FUNCTION AND EVOLUTION
By Ruben Salvaterra, S. Campana, S. Vergani, S. Covino, P. D’Avanzo, D. Fugazza, G. Ghirlanda, G. Ghisellini, A. Melandri, L. Nava and 4 more. 2011
199 citations recorded by the source corpus.
We present a carefully selected sub-sample of Swift long gamma-ray bursts (GRBs) that is complete in redshift. The sample is constructed by considering only bursts with favorable observing conditions for ground-based follow-up searches, which are bright in the 15–150 keV Swift/BAT band, i.e., with 1-s peak photon fluxes in excess to 2.6 photons s−1 cm−2. The sample is composed of 58 bursts, 52 of them with redshift for a completeness level of 90%, while another two have a redshift constraint, reaching a completeness level of 95%. For only three bursts we have no constraint on the redshift. The high level of redshift completeness allows us for the first time to constrain the GRB luminosity function and its evolution with cosmic times in an unbiased way. We find that strong evolution in luminosity (δl = 2.3 ± 0.6) or in density (δd = 1.7 ± 0.5) is required in order to account for the observations. The derived redshift distributions in the two scenarios are consistent with each other, in spite of their different intrinsic redshift distributions. This calls for other indicators to distinguish among different evolution models. Complete samples are at the base of any population studies. In future works we will use this unique sample of Swift bright GRBs to study the properties of the population of long GRBs.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/d9c9dd1a17bace5e9f73b711ccc94942216d0306
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Citations in the corpus
- GRB hosts through cosmic time - VLT/X-Shooter emission-line spectroscopy of 96 γ-ray-burst-selected galaxies at 0.1 (2015, methodology): “…be divided into two main sub-categories: First, dedicated host spectroscopy, which aims on either measuring redshifts of GRBs for sample studies (e.g., Krühler et al. 2012b; Salvaterra et al. 2012) or the physical properties of individual GRB hosts (e.g., Vergani et al. 2011; Krühler et al. 2012a).”
- THE OPTICALLY UNBIASED GAMMA-RAY BURST HOST (TOUGH) SURVEY. I. SURVEY DESIGN AND CATALOGS (2012, background): “…al. 2007; (29) Berger & Gladders 2006; (30) Thöne et al. 2010; (31) Ferrero et al. 2009; (32) Gal-Yam et al. 2006; (33) Della Valle et al. 2006a; (34) Salvaterra et al. 2012; (35) Milvang-Jensen et al. 2012; (36) Levan et al. 2007; (37) Ruiz-Velasco et al. 2007; (38) Osip et al. 2006; (39)…”
- A complete sample of bright Swift long gamma-ray bursts: testing the spectral-energy correlations (2011, background): “The sample is presented by Salvaterra et al. (2012) and it comprises 58 events detected bySwift with a 1–s peak photon fluxP > 2.6 ph s−1cm−2 (integrated in the 15–150 keV energy range).”
- A POPULATION OF MASSIVE, LUMINOUS GALAXIES HOSTING HEAVILY DUST-OBSCURED GAMMA-RAY BURSTS: IMPLICATIONS FOR THE USE OF GRBs AS TRACERS OF COSMIC STAR FORMATION (2013, methodology): “This galaxy was also observed with X-shooter; a secure redshift based on detection of the [O III] and Hα emission lines at z = 2.260 was reported by Salvaterra et al. (2012).”
- THE THIRD SWIFT BURST ALERT TELESCOPE GAMMA-RAY BURST CATALOG (2015, unknown): “Some catalogs with selected BAT GRBs for specific usages have also been presented, such as the catalog composed by Salvaterra et al. (2012) (also known as the BAT6 catalog) that selects bright bursts detected by BAT with optimal conditions for ground follow-up observations, in order to construct a…”