GMASS ultradeep spectroscopy of galaxies at z ~ 2 - VII. Sample selection and spectroscopy

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Volume 549 (January 2013)

A&A, 549 (2013) A63

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Table 2

Masks: slits and exposure times.

M^a	Grating	Slits^b	Blue^c	Red^c	P73^d	P74^d	P75^d	P76^d	Total	Used^e
					[h]	[h]	[h]	[h]	[h]	[h]


1	300I	41	1	33	12.75	1.00	–	–	13.75	12
2	300V	45	32	–	4.00	8.50	–	–	12.50	11
3	300V	43	39	1	–	15.00	–	–	15.00	14
4	300V	45	36	–	–	16.00	–	–	16.00	15
5	300I	42	8	26	–	34.00	–	–	34.00	32
6	300I	39	14	19	–	3.00	9.75	21.00	33.75	30


Total		255^f	130	79	16.75	77.50	9.75	21.00	123.00	114

Notes.

^(a)

Mask number.

^(b)

The remaining slits contained fillers (i.e., #fillers = #slits - #blue - #red).

^(c)

If a slit contained another target in addition, this is not counted here.

^(d)

Amount of exposure time (i.e., not including any kind of overheads) obtained during ESO periods 73, 74, 75, or 76, corresponding to Apr-Sep 2004, Oct-Mar 2004/5, Apr-Sep 2005, and Oct-Mar 2005/6, respectively. This includes time during conditions worse than specified for the service mode observations, and aborted observing blocks.

^(e)

Exposure time actually used in the reduction of the spectra.

^(f)

The total number of slits is not equal to the total number of observed targets as some targets were observed in more than one mask. In addition, a few slits contained more than one target.

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