Shocked Molecular Hydrogen And Broad Co Lines From The Interacting Supernova Remnant Hb 3

We present the detections of shocked molecular hydrogen (H-2) gas in near- and mid-infrared and broad CO in millimeter from the mixed-morphology supernova remnant (SNR) HB 3 (G132.7+1.3) using the Palomar Wide-field InfraRed Camera, the Spitzer GLIMPSE360 and Wide-field Infrared Survey Explorer (WISE) surveys, and the Heinrich Hertz Submillimeter Telescope. Our near-infrared narrow-band filter H-2 2.12 mu m images of HB 3 show that both Spitzer Infrared Array Camera and WISE 4.6 mu m emission originates from shocked H-2 gas. The morphology of H-2 exhibits thin filamentary structures and a large scale of interaction sites between the HB 3 and nearby molecular clouds. Half of HB 3, the southern and eastern shell of the SNR, emits H-2 in a shape of a butterfly or W, indicating the interaction sites between the SNR and dense molecular clouds. Interestingly, the H-2 emitting region in the southeast is also co-spatial to the interacting area between HB 3 and the H ii regions of the W3 complex, where we identified star-forming activity. We further explore the interaction between HB 3 and dense molecular clouds with detections of broad CO(3-2) and CO(2-1) molecular lines from the southern and southeastern shell along the H-2 emitting region. The widths of the broad lines are 8-20 km s(-1); the detection of such broad lines is unambiguous, dynamic evidence of the interactions between the SNR and clouds. The CO broad lines are from two branches of the bright, southern H-2 shell. We apply the Paris-Durham shock model to the CO line profiles, which infer the shock velocities of 20-40 km s(-1), relatively low densities of 10(3-4) cm(-3), and strong (>200 mu G) magnetic fields.