Galaxy counterparts of intervening high-z sub-DLAs/DLAs and Mg ii absorbers towards gamma-ray bursts

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Volume 546 (October 2012)

A&A, 546 (2012) A20

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Table 4

continued.

GRB 050908 (DLA: z = 3.3467, DLA: z = 2.6208, Mg ii absorber: z = 1.5481)
Candidate	Remark	θ (″)	R (mag)	K_s (mag)	3.6 μm (mag)	5.8 μm (mag)

C1	z ≈ 2.71	12.6	27.10 ± 0.20
C2		11.5	24.96 ± 0.04		23.25 ± 0.19
C3		6.6	25.97 ± 0.09
C4^a		12.4	26.17 ± 0.09
C5^a^b		3.7	25.05 ± 0.04		23.65 ± 0.23	22.44 ± 0.44
C6^a^b		2.8	25.39 ± 0.05
C7^b		1.1	26.98 ± 0.18
C8		5.5	26.59 ± 0.21
C9		2.5	25.96 ± 0.12		~25.0 ± 0.5

GRB 070721B (GRB: z = 3.6298, DLA: z = 3.0939)
Candidate	Remark	θ (″)	R (mag)	F775W (mag)	H (mag)	K_s (mag)

D1		12.8		27.40 ± 0.12
D2a ^a	z ≈ 2.64	3.0		27.34 ± 0.12
D2b ^a		2.8		28.23 ± 0.22
D3	z = 3.096	1.0	24.48 ± 0.02	24.41 ± 0.02	23.40 ± 0.07	23.56 ± 0.23
D4	z = 3.631	0.1		27.31 ± 0.15
D5		6.9	26.82 ± 0.18	26.44 ± 0.10
D6a ^a	z ≈ 2.64	11.7		25.05 ± 0.04
D6b ^a		12.2		26.90 ± 0.09
D7	z = 3.615	20.7	23.77 ± 0.01	23.74 ± 0.03	24.02 ± 0.11	23.20 ± 0.17

Notes. Selective Galactic extinctions, E(B − V), are 0.025 and 0.031 mag for GRBs 050908 and 070721B, respectively. Spectra were extracted for boldfaced objects. Based on the spectrum or the SED of an object, we show in the column “remark” if it is a star or at which redshift the galaxy is. The 3σ limiting magnitudes are GRB 050908: R = 27.4, K_s = 23.0, 3.6 μm = 23.8, 5.8 μm = 22.3 mag and GRB 070721B: R = 27.5, F775W = 28.7, H = 23.1, K_s = 23.2 mag.

^(a)

Blended object. The magnitude is only an estimate. The spectrum is the integrated spectrum of the blended objects.

^(b)

We did not attempt photometry on objects that are strongly blended in the Spitzer data in this work, with the exception of objects C5, C6, and C7, which are sufficiently closely blended that we report the (summed) photometry of all three objects as a group.

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