Source finding, parametrization, and classification for the extragalactic Effelsberg-Bonn H i Survey

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Table 1

Parameters of selected current large-scale H i surveys.

Parameter	EBHIS	HIPASS	ALFALFA

Coverage	δ> −5°	δ< 25°	0°<δ< 36° ^a
Survey area	22 424 deg²	29 343 deg²	7074 deg²
Angular resolution	10.́8	15.́5	3.́5
Spectral resolution	10.24 km s^-1	26.4 km s^-1	5.4 km s^-1
Spectral coverage	cz< 18 000 km s^-1	cz< 12 700 km s^-1	cz< 18 000 km s^-1
Noise level	23 mJy beam^-1	13 mJy beam^-1	2.4 mJy beam^-1
Source density	–^b	0.2 deg^-2	5.8 deg^-2 ^c

Notes.

^(a)

Restricted to two separate areas between Right Ascension 75 to 165 and 220 to 30 hours.

^(b)

Expected to reach about HIPASS density.

^(c)

Derived from 40% of the final survey area.

Reference. Zwaan et al. (2004); Giovanelli et al. (2005); Wong et al. (2006); Haynes et al. (2011).

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