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Accretion disk winds are revealed in Chandra gratings spectra of black holes.The winds are hot and highly ionized (typically composed of He-like and H-likecharge states), and show modest blue-shifts. Similar line spectra are sometimesseen in "dipping" low-mass X-ray binaries, which are likely viewed edge-on;however, that absorption is tied to structures in the outer disk, andblue-shifts are not typically observed. Here we report the detection ofblue-shifted He-like Fe XXV (3100 +/- 400 km/s) and H-like Fe XXVI (1000 +/-200 km/s) absorption lines in a Chandra/HETG spectrum of the transient pulsarand low-mass X-ray binary IGR J17480-2446 in Terzan 5. These features indicatea disk wind with at least superficial similarities to those observed instellar-mass black holes. The wind does not vary strongly with numerous weakX-ray bursts or flares. A broad Fe K emission line is detected in the spectrum,and fits with different line models suggest that the inner accretion disk inthis system may be truncated. If the stellar magnetic field truncates the disk,a field strength of B = 0.7-4.0 E+9 Gauss is implied, which is in line withestimates based on X-ray timing techniques. We discuss our findings in thecontext of accretion flows onto neutron stars and stellar-mass black holes.

A Fast X-ray Disk Wind in the Transient Pulsar IGR J17480-2446 in Terzan 5