Star formation in Chamaeleon I and III: a molecular line study of the starless core population

Free Access

Table 2

Parameters of Cha I and III observations with APEX.

Transition	f ^a	σ _ν ^b	HPBW ^c	Receiver	Mixing	Backend	δf ^d	δV ^e	N _cores ^f	B _eff ^g	T _sys ^h	rmsⁱ
	(MHz)	(kHz)	(′′)				(kHz)	(km s^-1)		(%)	(K)	(mK)

Cha I
C¹⁸O 2–1	219 560.3541	1.5	27.7	APEX-1	SSB	FFTS1	122	0.17	60	75	187–208	62–192
¹³CO 2–1^j	220 398.6842	0.1	27.6	APEX-1	SSB	FFTS1	122	0.17	60	75	174–198	52–160
C¹⁷O 2–1^j	224 714.1870	80	27.1	APEX-1	SSB	FFTS1	122	0.16	33	75	216–359	65–122
H₂CO 3_1,2–2_1,1	225 697.7750	10	27.0	APEX-1	SSB	FFTS1	122	0.16	33	75	198–334	52–95
HCN 3–2	265 886.4339	0.4	22.9	APEX-2	SSB	FFTS1	122	0.14	30	74	141–269	28–81
HCO⁺ 3–2	267 557.6259	1.1	22.8	APEX-2	SSB	FFTS1	122	0.14	30	74	176–344	35–94
N₂H⁺ 3–2^j	279 511.7843	6.3	21.8	APEX-2	SSB	FFTS1	122	0.13	10	60	160–290	38–55
N₂H⁺ 3–2^j	279 511.7843	6.3	21.8	FLASH345	2SB	XFFTS	76	0.08	5	60	172–192	33–63
CO 3–2	345 795.9899	0.5	17.6	APEX-2A	DSB	FFTS1	122	0.11	–^k	73	160–235	600
Cha III
C¹⁸O 2–1	219 560.3541	1.5	27.7	APEX-1	SSB	XFFTS2	76	0.10	29	75	205–261	98–144
C¹⁷O 2–1	224 714.1870	80	27.1	APEX-1	SSB	XFFTS2	76	0.10	2	75	218–220	69–72

Notes.The forward efficiency for all transitions is 95%.

^(a)

Rest frequency taken from the Cologne Database for Molecular Spectroscopy (CDMS; Müller et al. 2005).

^(b)

Frequency uncertainty taken from the CDMS.

^(c)

Angular resolution.

^(d)

Channel spacing in frequency.

^(e)

Channel spacing in velocity.

^(f)

Number of observed cores.

^(g)

Main-beam efficiency.

^(h)

System temperature.

⁽ⁱ⁾

rms sensitivity in scale.

^(j)

Transition with hyperfine structure.

^(k)

Map of part of Cha I North.

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.