Physical parameters for the Orion fibers

Table with the physical properties determined for the 152 velocity-coherent fibers identified in the EMERGE Early ALMA Survey.

The latter is a sample of 7 star-forming regions in Orion homogeneously surveyed with ALMA in N2H+ (1-0) at 4.5".

The raw data was reduced with a uniform analysis using a combinaiton of custom spectral fitting routines, the identification algorithm in the PPV plane HIFIVe (Hacar et al. 2018) and the radial profile fitting routine FilChap (Suri et al. 2019).

The header of the table includes the following parameters:

ID: fiber identification number within the region assigned by HIFIVe during the identification process;

x0, y0: average x-y coordinates of the fiber with respect to the reference pixel in the datacube [unit: ''];

dV, sd_dV: median velocity dispersion (as FWHM of the spectral line) and corresponding standard deviation across the structure [unit: km s-1];

sNT, sd_sNT: median non-thermal dispersion (in units of the sound speed) and corresponding standard deviation across the structure;

Vlsr, sd_Vlsr: median centroid velocity and corresponding standard deviation across the structure [unit: km s-1];

Mass: total mass of the strcuture [unit: Msun];

points: number of fields associated to the structure;

Tk: median kinetic temperature of the structure [unit: K];

L: length of the structure [unit: pc];

AR: aspect ratio (computed as L / FWHM);

gradVx: median centroid velocity gradient along the axis knots [unit: km s-1 pc-1];

ML: line mass of the fiber (computed as M / L) [unit: Msun pc-1];

lgrad: mean velocity gradient across the whole axis length [unit: km s-1 pc-1];

P: number of protostars associated to the structure;

source: region in which the fiber was identified;

FWHM: fiber width as derived from the fitting of its column density radial profile [unit: pc];

N0: fiber peak column density as derived from the fitting of its column density radial profile [unit: cm-2];

gradT: temperature gradient determined around the fiber axis [unit: K pc-1].