(a) Enlarged view of ALMA CO map toward an X-ray hotspot presented by Uchiyama et al. (2007). (b–h) Sequence of X-ray observations in 2000 July, 2005 July, 2006 May, 2009 January, 2009 May, 2009 September, and 2011 July. All X-ray images show the same intensity scales. Superposed contours indicate the CO intensity. Gray shaded areas were eliminated due to low exposure time (see the text).