Free Access

Table 9

Line widths and photodissociation rates.

UT date  ⟨ rh ⟩  Line Beam size VHM vexp β0 Ld
[mm/dd.dd] [AU] [″] [km] [km s-1] [km s-1] [km s-1] [s-1] [km]

C/2002 X5: (2003)
01/13.60 0.553 HCN(3–2)1 9.6 7190 −1.09 ± 0.07  + 1.20 ± 0.07 0.90 1.7 × 10-5 14 330
01/26.54 0.213 HCN(3–2) 9.4 7990 −0.97 ± 0.03  + 1.42 ± 0.02 1.25 1.92 × 10-5 2950–48702
01/26.54 0.213 HNC(3–2) 9.2 7820 −0.86 ± 0.11  + 1.28 ± 0.03 1.25 1.92 × 10-5 2950–45002
01/26.56 0.212 CS(3–2) 17.5 14 880 −0.92 ± 0.06  + 1.26 ± 0.03 1.20 1–3 × 10-5 1800–5400
01/26.60 0.212 HC3N(28−27) 9.7 8250 −0.73 ± 0.18  + 0.93 ± 0.11 0.90 6.8 × 10-5 6902
01/26.55 0.213 CH3OH((50−5-1) + (60−6-1) + (70−7-1)E)
15.5 13 170 −0.92 ± 0.20  + 1.25 ± 0.10 1.25 1.43 × 10-5 4120−51302
03/12.72 1.184 HCN(3–2) 9.6 7630 −0.65 ± 0.04  + 0.52 ± 0.07 0.65 1.6 × 10-5 47 460

C/2002 V1: (2003)
02/16.55 0.136 HCN(3–2) 9.3 6600 −2.07 ± 0.06  + 2.26 ± 0.04 2.00 1.8 × 10-5 2080–29502
02/16.57 0.135 HNC(3–2) 9.2 6520 −2.34 ± 0.22  + 2.13 ± 0.26 2.00 1.8 × 10-5 2030–25002
02/16.55 0.136 CS(3–2) 17.3 12 270 −1.60 ± 0.35  + 1.65 ± 0.18 1.60 1−3 × 10-5 1000–3000
02/17.10 0.120 CH3OH((73 − 72)A+−+(63 − 62)A+−+(53 − 52)A+−+(43 − 42)A+−+(73 − 72)A−+)
10.0 7120 −1.96 ± 0.34  + 2.37 ± 0.43 2.00 1.38 × 10-5 2090–25802
02/17.50 0.108 HCN(3–2) 9.3 6650 −2.07 ± 0.07  + 2.24 ± 0.06 2.00 1.8 × 10-5 1300–22502
02/17.50 0.108 CS(3–2) 17.3 12 370 −2.60 ± 0.60  + 1.65 ± 0.10 1.60 1–3 × 10-5 620–1870
02/17.60 0.105 HCN(1–0) 26.8 19 180 −1.3 ± 1.1  + 2.9 ± 1.1 2.00 1.8 × 10-5 1230–22002

C/2006 P1: (2007)
01/16.56 0.228 HCN(3–2) 9.3 5540 −1.42 ± 0.02  + 1.78 ± 0.03 1.50 1.60 × 10-5 4870–12 3002
01/16.56 0.228 HCN(1–0) 26.5 15 780 −1.34 ± 0.03  + 1.79 ± 0.06 1.50 1.60 × 10-5 4870–12 3002
01/16.55 0.228 H2CO(312-211) 10.8 6430 −1.10 ± 0.20  + 1.10 ± 0.15 1.1 2.0 × 10-4 2903 → 1210
01/16.56 0.228 CH3OH((40 − 4-1) + (50 − 5-1) + (60 − 6-1) + (70 − 7-1)E)
15.5 9230 −1.45 ± 0.15  + 1.90 ± 0.30 1.50 1.32 × 10-5 5900–10 6002
01/17.56 0.255 HCN(3–2) 9.3 5620 −1.33 ± 0.05  + 1.67 ± 0.05 1.45 1.60 × 10-5 5890–12 0002
01/17.55 0.255 HNC(3–2) 9.2 5480 −1.23 ± 0.11  + 1.60 ± 0.15 1.40 1.60 × 10-5 5670–10 5002
01/17.56 0.255 CS(3–2) 17.0 10 270 −1.17 ± 0.05  + 1.20 ± 0.10 1.2 1–3 × 10-5 2620–9800
01/17.59 0.256 HCO+(1–0) 26.2 15 830 −2.80 ± 0.53  + 2.03 ± 0.53

Notes. 

(1)

Only low resolution (1 MHz = 1.2 km s-1) spectra.

(2)

Scale-length taking into account screening (Sect. 4.2): based on the equivalent lifetime that would lead to the same number of molecule in the coma without screening.

(3)

When we assume that H2CO comes from an extended source with scale-length 1.75 × LH2CO, this value increases by a factor  ≈ 4.23 (to get a 1/e decrease from the peak value at 1.30 × LH2CO).

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.