Ground-state ammonia and water in absorption towards Sgr B2

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Table 1

Absorption feature identifications in order of increasing Galactic radius.

Feature	V _LSR	Origin	R^a
	[km s^-1]		[kpc]

G	+60	Sgr B2 molecular cloud	0.1
E^b	+3	Sgr B2 ejecta	0.1
A	−107	Expanding Molecular Ring, EMR	0.2^c
B	−80	1 kpc disk^d	< 1
C	−43	3 kpc arm	2.8^e
D	−28/−22	−23 km s^-1 arm	3.4^f
E^b	+3	Local gas	≲ 7.6
F	+30	+30 km s^-1 feature	?^g

Notes.

^(a)

Approximate galactocentric distances scaled to R₀ = 7.6 kpc;

^(b)

see discussion in text, Sect. 3;

^(c)

from H₂CO, Whiteoak & Gardner (1979);

^(d)

see Greaves & Nyman (1996);

^(e)

from H i, Rougoor & Oort (1960);

^(f)

from H i, Menon & Ciotti (1970);

^(g)

see text Sect. 3.

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