Table 1
Observed line parameters of HCS and HSC in L483.
| Species | Transition | Frequency | Eu | Aul | gu | V LSR | Δv |  |
|---|---|---|---|---|---|---|---|---|
| (MHz) | (K) | (s−1) | (km s−1) | (km s−1) | (mK km s−1) | |||
| HCS | 20,2 − 10,1 J = 5∕2 − 3∕2 F = 3 − 2 | 80 553.516 | 5.8 | 4.50 × 10−7 | 7 | +5.43(3) | 0.61(5) | 10.5(9) |
| 20,2 − 10,1 J = 5∕2 − 3∕2 F = 2 − 1 | 80 565.596 | 5.8 | 4.34 × 10−7 | 5 | +5.33(5) | 0.77(12) | 10.4(12) | |
| 20,2 − 10,1 J = 3∕2 − 1∕2 F = 2 − 1 | 80 596.409 | 5.8 | 3.41 × 10−7 | 5 | +5.56(6) | 0.88(12) | 9.0(11) | |
| 20,2 − 10,1 J = 3∕2 − 1∕2 F = 1 − 0 | 80 611.994 | 5.8 | 2.51 × 10−7 | 3 | +5.32(10) | 0.70(20) | 3.5(11) | |
| 20,2 − 10,1 J = 3∕2 − 1∕2 F = 1 − 1 | 80 618.820 | 5.8 | 1.79 × 10−7 | 3 | +5.67(7) | 0.36(23) | 2.4(10) | |
| HSC | 20,2 − 10,1 J = 5∕2 − 3∕2 F = 2 − 1 | 81 192.825 | 5.8 | 1.55 × 10−5 | 5 | – | – | – a |
| 20,2 − 10,1 J = 3∕2 − 1∕2 F = 2 − 1 | 81 194.075 | 5.9 | 1.16 × 10−5 | 5 | +5.39(8) | 0.65(15) | 4.5(11) | |
| 20,2 − 10,1 J = 5∕2 − 3∕2 F = 3 − 2 | 81 199.988 | 5.9 | 1.55 × 10−5 | 7 | +5.42(5)b | 0.43(9)b | 4.0(8)b |
Notes. Numbers in parentheses are 1σ uncertainties in units of the last digits. The antenna temperaturescale can be converted into the main beam brightness temperature by dividing by (Beff ∕Feff ), which is 0.82/0.95 for the IRAM 30 m telescope at 81 GHz. (a) Line is not visible because it overlaps a frequency-switching negative artifact of the HSC 20,2 − 10,1 J = 5∕2 − 3∕2 F = 3 − 2 line at 81 199.988 MHz (see Fig. 2). (b) Intensity is reduced because the line overlaps a frequency-switching negative artifact of the HSC 20,2 − 10,1 J = 5∕2 − 3∕2 F = 2 − 1 line at 81 192.825 MHz, the line width is likely reduced as well because the line partially overlaps a negative artifact of a line of CH2 CN lying 7.36 MHz higher in frequency (see Fig. 2), and the derived V LSR is probably affected as well.
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