A correlation between chemistry, polarization, and dust properties in the Pipe nebula starless core FeSt 1-457

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Volume 597 (January 2017)

A&A, 597 (2017) A74

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Table 4

Bonnor-Ebert fit parameters of FeSt 1-457.


Model	ρ_c	R_out	T^b	ξ_max	ρ_c/ρ_R	P_out	Mass		Stable?	Age^c
	(10³ cm^-3)	(10³ au)	(K)			(10⁵ K cm^-3)	(M_⊙)	(mag)		(yr)

BE isothermal^a	200 ± 20	20 ± 1	10.5 ± 0.1	10.5 ± 0.7	47 ± 5	0.6 ± 0.1	2.7	9.5	No	9.6 × 10⁵
BE + T_profile^d	200 ± 20	20 ± 1	12.0 ± 0.1	9.8 ± 0.7	40 ± 5	0.8 ± 0.1	2.7	9.5	No	9.6 × 10⁵

Notes.

^(a)

Parameters fit for the isothermal BE model. The uncertainties of the fit parameters ρ_c, R_out and T were estimated by analyzing the increase of the χ² residual fit by varying the parameters. The uncertainties of the derived physical parameters ξ_max, ρ_c/ρ_R and P_out were assessed through error propagation analysis.

^(b)

Temperature used to determine the sound speed value, c_s.

^(c)

Based on Aikawa et al. (2005) results following the evolution of a marginally unstable Bonnor-Ebert sphere (T = 10 K, α = 1.1, where α is the internal gravity to pressure ratio).

^(d)

Modified Bonnor-Ebert model using the temperature profile of the upper panel of Fig. 7. The uncertainties are the same as in the isothermal model because the new temperature profile does not modify the Bonnor-Ebert density profile, it only modifies the resulting 1.2 mm emission (see Sect. 4.1).

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