Are long gamma-ray bursts biased tracers of star formation? Clues from the host galaxies of the Swift/BAT6 complete sample of bright LGRBs - II. Star formation rates and metallicities at z < 1

J. Japelj; S. D. Vergani; R. Salvaterra; P. D’Avanzo; F. Mannucci; A. Fernandez-Soto; S. Boissier; L. K. Hunt; H. Atek; L. Rodríguez-Muñoz; M. Scodeggio; S. Cristiani; E. Le Floc’h; H. Flores; J. Gallego; G. Ghirlanda; A. Gomboc; F. Hammer; D. A. Perley; A. Pescalli; P. Petitjean; M. Puech; M. Rafelski; G. Tagliaferri

doi:10.1051/0004-6361/201628314

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Volume 590 (June 2016)

A&A, 590 (2016) A129

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Table 2

Measured redshift, host extinctions, metallicites, and star formation rates of our sample.

GRB	z	log M_⋆	A _V ^a	12 +		SFR	SF-tracer

		M _⊙	(mag)	M08	KK04	(M_⊙ yr^-1)

050416A	0.6542	9.17	1.77	8.50	8.4 ± 0.2	3.45 ± 1.42	Hα
050525A^†	0.6063	8.1	–	–	–	>0.10	[O iii]
060614A	0.125	8.09	0.65	8.46	8.4 ± 0.2	0.007 ± −0.003	Hα
060912A	0.9362	9.23	0.50	8.60	8.72	5.07 ± 0.93	Hα
061021	0.3453	8.5	0.32	8.48	8.4 ± 0.2	0.04 ± 0.01	Hα
071112C	0.821	8.89	<0.2	7.90	7.88	1.1 ± 0.4	Hγ^b
080430	0.767	8.15	<0.1	7.60	7.94	1.65 ± 0.63	Hβ^b
080916A^†	0.688	8.98	–	8.44	8.00/8.99	>0.20	[O ii]
081007	0.5294	8.78	0.49	8.32	8.32/8.58	0.36 ± 0.07	Hα
090424	0.5445	9.38	1.42	8.88	8.39/8.69	2.88 ± 1.14	Hα
091018	0.9710	9.52	1.25	8.48	8.4 ± 0.2	2.98 ± 1.81	Hα
091127	0.4904	8.67	<0.3	8.50	8.47	0.25 ± 0.02	Hα
100621A	0.5426	9.04	0.34	8.40	8.25/8.67	8.92 ± 1.44	Hα

Notes. Stellar masses are adopted from Vergani et al. (2015).

^(a)

Extinction was measured from the Balmer decrement for all cases but GRBs 050525A and 080916A – see text for details.

^(b)

Flux of the significantly detected Balmer line was first transformed to the Hα flux (see text and Osterbrock & Ferland 2006) and then to the SFR.

^(†)

Because we lack the Balmer emission lines, the host extinction cannot be computed. Reported star-formation rates are therefore formally lower limits.

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