The ionization fraction gradient across the Horsehead edge: an archetype for molecular clouds

Home

All issues

Volume 498 / No 3 (May II 2009)

A&A, 498 3 (2009) 771-783

Full HTML

Free Access

Table 1:

Observation parameters of the PdBI maps shown in Fig. 1.
Molecule	Transition	Frequency	Instrument	Config.	Beam	PA	Vel. Resol.	Int. Time^a	$T_\ensuremath{{\rm sys}}$	Noise $^{b,\dagger}$	Obs. date
		GHz			arcsec	$\deg$	km s^-1	hours	K	K
H¹³CO⁺	1-0	86.754288	PdBI	C & D	$6.8 \times 4.7$	13	0.2	6.5	150	0.10	2006-07
HCO	1_0,1 3/2, 2- 0_0,0 1/2,1	86.670760	PdBI	C & D	$6.7 \times 4.4$	16	0.2	6.5	150	0.09	2006-07

^a We observed a 7-field mosaic centered on the IR peak at $\alpha_{2000} = 05^{\rm h}40^{\rm m}54.27^{\rm s}$ , $\delta_{2000} = -02\deg 28'00''$ (Abergel et al. 2003) with the following offsets: (-5.5'', -22.0''), (5.5'', -22.0''), (11.0'', 0.0''), (0.0'', 0.0''), (-11.0'', 0.0''), (-5.5'', 22.0'') and (5.5'', 22.0''). The total field-of-view is $80.1''\times 102.1''$ and the half power primary beam is 58.1''. The mosaic was Nyquist sampled in declination at 3.4 mm and largely oversampled in right ascension. This maximizes the field of view along the PDR edge while the oversampling in the perpendicular direction eases the deconvolution. On-source time was computed as if the source was always observed with 6 antennae; ^b the noise values refer to the mosaic phase center (mosaic noise is inhomogeneous due to primary beam correction; it steeply increases at the mosaic edges).

Source LaTeX | All tables | In the text

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.