Intrinsic width of the western extension around Boötes I

Determine whether the extended stellar feature toward the west of Boötes I is intrinsically narrow or broad, despite incompleteness and morphological distortion caused by bright foreground stars.

Background

The surface-density map of Boötes I shows a weak extension perpendicular to the orbital direction, including a western feature and southwestern clumpy structures. Two bright foreground stars reduce detection completeness in the western region and may artificially pinch or distort the observed morphology. The available photometric data therefore do not establish the intrinsic width of the western extension.