The Nature and Orbit of the Ophiuchus Stream

The *_chain.txt files contain Markov chains that model the line-of-sight velocity (RV_chains.txt), color-magnitude diagram (CMD_chains.txt), and proper motion and the extent of the Ophiuchus stellar stream (PM_chains.txt). By randomly selecting rows from these files, one can sample the corresponding probability density functions.The columns in each file are briefly described below. RV_chains.txt: column 1: line-of-sight velocity at {ell}_0=5deg, column 2: gradient in line-of-sight velocity, d(v_los)/d({ell}) column 3: additional scatter in line-of-sight velocities, s CMD_chains.txt: column 1: age, t column 2: mass-loss parameter, eta column 3: metallicity content, Z column 4: offset in reddening with respect to the Schlegel et al. (1998) [1998ApJ...500..525S] reddening, (E(B-V)_off) column 5: distance modulus at {ell}_0=5deg, column 6: gradient distance modulus, d(DM)/d({ell}) columns 7-11: uncertainty in isochrone magnitudes, {sigma}_iso_m, where m=[g,r,i,z,y,] PM_chains.txt: column 1: fraction of stars associated with the field population, 1-f column 2: natural logarithm of the width of the stream in the galactic latitude direction, ln({sigma}_b) column 3: natural logarithm of the width of the field population in the galactic latitude direction, ln({sigma}_p_b) column 4: A_p column 5: B_p column 6: ln({sigma}_pm) column 7: ln({sigma}_p_pm) column 8: column 9: d({mu}_{ell})/d({ell}) column 10: column 11: d({mu}_b)/d({ell}) column 12: column 13: d({mu}_p_{ell})/d({ell}) column 14: column 15: d({mu}_p_b)/d({ell}) column 16: {ell}_min column 17: {ell}_max column 18: A column 19: B column 20: