Chemical survey of Class I protostars with the IRAM-30 m

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Table 7

Upper limits (3σ) on the column densities of the iCOMs detected in L1551-IRS5 towards L1489-IRS, B5-IRS1, and L1455-IRS1.

Species	N_tot ^(a)
	(cm⁻²)

	L1489-IRS	B5-IRS1	L1455-IRS1
CH₃OH	≤2 × 10¹³	≤1 × 10¹³	≤2 × 10¹³
CH₃CN	≤2 × 10¹¹	≤2 × 10¹¹	≤2 × 10¹¹
CH₃CHO	≤8 × 10¹¹	≤5 × 10¹¹	≤6 × 10¹¹
HCOOCH₃	≤7 × 10¹²	≤5 × 10¹²	≤6 × 10¹²

Notes. ^(a) Column densities are beam averaged. The values are derived assuming T_rot equal to 150K (i.e., assuming a hot corino region), as found in L1551-IRS5.

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