Herschel observations of a potential core-forming clump: Perseus B1-E

Free Access

Table 3

Properties from NH₃ (1, 1) and NH₃ (2, 2) line spectra.

Source	v_lsr	Δv^a	T_K^b	σ_T^c	σ_NT
	(km s^-1)	(km s^-1)	(K)	(km s^-1)	(km s^-1)

B1-E1	7.61 ± 0.02	0.998 ± 0.056	<27	0.073 ± 0.007	0.417 ± 0.025
B1-E2	7.67 ± 0.002	0.293 ± 0.005	10.26 ± 0.36	0.071 ± 0.001	0.101 ± 0.003
B1-E3	7.47 ± 0.01	0.681 ± 0.030	<16	0.073 ± 0.007	0.280 ± 0.015
B1-E4	7.83 ± 0.01	1.078 ± 0.036	<27	0.073 ± 0.007	0.451 ± 0.016
B1-E5	7.57 ± 0.01	0.833 ± 0.022	<19	0.073 ± 0.007	0.344 ± 0.012
B1-E6	7.61 ± 0.01	0.905 ± 0.032	<23	0.073 ± 0.007	0.376 ± 0.015
B1-E7	7.31 ± 0.01	0.708 ± 0.032	<24	0.073 ± 0.007	0.290 ± 0.016
B1-E8	6.78 ± 0.01	0.537 ± 0.021	<20	0.073 ± 0.007	0.213 ± 0.012
B1-E9	7.11 ± 0.01	0.690 ± 0.038	< 32	0.073 ± 0.007	0.282 ± 0.018

Notes.

^(a)

The velocity FWHM from the best-fit models uncorrected for channel resolution.

^(b)

Kinetic temperature towards each source. For B1-E2, we measured the kinetic temperature from NH₃ (1, 1) and NH₃ (2, 2) line emission. For our other sources, we used a 3σ upper limit for NH₃ (2, 2) to estimate the upper limit of T_K.

^(c)

The thermal line width of B1-E2 was determined using the derived kinetic temperature, T_K = 10.26 K ± 0.36 K. For the remaining sources, we adopted 11 K, the mean NH₃-derived kinetic temperature from Rosolowsky et al. (2008) with an uncertainty of 2 K from the dispersion of the kinetic temperature in that survey (see Enoch et al. 2008).

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.