Open Access

Table 1

Properties of different large fields mapped by Herschel.

Field Mode N(rep) Time Area Noise level in mJy
[hr] [deg2] 5σ at 250 μm
(1) (2) (3) (4) (5) (6)
HeViCS Parallel 8 286 55 30.5
H -ATLAS Parallel 2 600 550 56.0
HerMES
FLS Parallel 2 17.1 6.7 25.8
Bootes NDWFS Parallel 2 28 10.5 25.8
ELAIS-N2 Parallel 2 28 12.28 25.8
Lockman-Swire Parallel 4 71.2 16 13.6
XMM-LSS SWIRE Parallel 4 71.2 18.87 25.8
HeLMS Sp.Fast 2 103.4 274 64.0

Notes. Columns (1) name of the field observed by Herschel; (2) Herschel observing mode; (3) total number of repeats of the observing mode in the set; (4) total time of observations; (5) field area of good pixels; (6) total noise from the literature. Noise is calculated using the relation . The bottom six fields are areas with different design levels nested as a part of HerMES: total area covered in HerMES is 380 deg2. Shallow HeLMS field covers the area of 274 deg2, and deeper Level 1–Level 6 fields cover the total area of about 80 deg2. FLS and Lockman-SWIRE have been used to probe 500 μm-risers selection by Dowell et al. (2014), while Asboth et al. (2016) applied the same selection method in the HeLMS field.

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