The headlight cloud in NGC 628: An extreme giant molecular cloud in a typical galaxy disk

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Table 1.

Observational parameters of the ALMA observations.

Line	ν	Noise	Restored	Δv_res	7 m+
	[GHz]	[K]	beam	[km s⁻¹]	TP
CS(5−4)	244.94	0.12 ^(a)	10 × 10	5.0	No
¹²CO(2−1)	230.54	0.17 ^(a)	10 × 10	2.5	Yes
¹²CO(1−0)	115.27	0.12	19 × 31	6.0	Yes
¹³CO(1−0)	110.20	0.03	26 × 35	6.0	Yes
HNC(1−0)	90.66	1.2	20 × 21	15.0	No
HCO⁺(1−0)	89.19	1.1	20 × 22	15.0	No
HCN(1−0)	88.63	1.2	21 × 22	15.0	No

Notes.

^(a)

Sensitivity measured in the region that was not fully covered by the interferometric data, which is where the headlight cloud is located. The sensitivity is 1.3 times better in the fully covered region.

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