Dense gas in low-metallicity galaxies | Astronomy & Astrophysics (A&A)

Free Access

Table 2

HCN has two satellite (hyperfine) lines at relative velocities of −7.1 and 4.8 km s^-1 and relative LTE intensities of 0.2 and 0.6, respectively.

Line	Frequency (GHz)

HCN(J = 1−0)	88.6318475
HCO⁺(J = 1−0)	89.18853
HNC(J = 1−0)	90.66356
CS(J = 2−1)	97.98095
N₂H⁺(J = 1−0)	93.1734
C₂H(N = 1−0)	87.316925^a
¹³CO(J = 1−0)	110.20137
C¹⁸O(J = 1−0)	109.78218
¹³CO(J = 2−1)	220.398686
C¹⁸O(J = 2−1)	219.56036

Notes. These lines are generally unresolved in all but the closest extragalactic sources. HCO⁺, HNC, and N₂H⁺ have unresolved hyperfine structure.

^(a)

C₂H has a total of 6 lines 87.284156, 87.316925 (strongest), 87.328624 (J = 3/2 → 1/2) 87.402004, 87.407165, 87.446512 (J = 1/2 → 1/2).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.