Nucleus of M31: Upper limits to the molecular and ionised gas content

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Table 2.

Different continuum observations (3σ upper limits).

Instrument	ν_obs	Δν	$3 σ_{up}^{\max}$ ${3\sigma^{{\mathrm{max}}}_{\mathrm{up}}}$

	GHz	GHz	μJy/beam
NOEMA	114.739	3.6	912.
NOEMA	218.327	7.5	24.
ALMA	351.071	7.5	96.^(a)
ALMA	344.332; 351.463	1.8; 7.3	93.; 150.

Notes. The upper limit of 99.7% CL on the continuum flux ( $σ_{up}^{\max}$ ${\sigma^{{\mathrm{max}}}_{\mathrm{up}}}$ ) computed for ΔV = 1000 km s⁻¹ at the central band frequency ν_obs on the whole available band Δν. The low-frequency side of the ALMA band was more sensitive.

^(a)

This estimate was derived on the spatial standard deviation of the stacked continuum image produced in the standard data reduction, computed on an area covering ten times the beam.

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