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Maps of optical images obtained with the Hubble Space Telescope (HST): (a) HST/WFC3 map with F336W filter (U-band), (b) HST/WFPC2 map with F606W filter (Hα), and (c) HST/WFC3 map with F110W filter (IR-band). The superposed contours and crosses are the same as in Figure 3. The scale bar is also shown in the bottom right corner in (a).

Maps of optical images obtained with the Hubble Space Telescope (HST): (a) HST/WFC3 map with F336W filter (U-band), (b) HST/WFPC2 map with F606W filter (Hα), and (c) HST/WFC3 map with F110W filter (IR-band). The superposed contours and crosses are the same as in Figure 3. The scale bar is also shown in the bottom right corner in (a).

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Fig. 1. False color image of M33 obtained with the VLT Survey Telescope...
Fig. 2. (a) RGB image of M33GMC 35. The red, and green, blue represent...
Fig. 3. Integrated intensity maps of 12 CO(J = 2-1). The velocity range...
Figure 4 shows the position-velocity diagram of 12 CO(J = 2-1). The...
+1 Fig. 5. Maps of optical images obtained with the Hubble Space Telescope...
ALMA CO Observations of a Giant Molecular Cloud in M33: Evidence for High-Mass Star Formation Triggered by Cloud-Cloud Collisions
Preprint
Full-text available
  • Aug 2019
We report the first evidence for high-mass star formation triggered by collisions of molecular clouds in M33. Using the Atacama Large Millimeter/submillimeter Array, we spatially resolved filamentary structures of giant molecular cloud 37 in M33 using $^{12}$CO($J$ = 2-1), $^{13}$CO($J$ = 2-1), and C$^{18}$O($J$ = 2-1) line emission at a spatial re...
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Context 1
... confirm the presence of high-mass stars, we compared them with archival optical datasets obtained with the Hubble Space Telescope (HST). Figure 5 shows the high-spatial resolution optical images obtained with the HST WFPC2 and WFC3 detectors. We can clearly see ∼ 10 high-mass stars bright in the U-band, Hα, and IR-band within the Kitt Peak National Observatory (KPNO) Hα contours. ...
Context 2
... cloud-cloud collisions in M33GMC 37 can create ∼10 high-mass stars at most. This is consistent with ∼10 stars that are detected by HST optical images within the KPNO Hα boundary (see Figure 5). ...
Context 3
... confirm the presence of high-mass stars, we compared them with archival optical datasets obtained with the Hubble Space Telescope (HST). Figure 5 shows the high-spatial resolution optical images obtained with the HST WFPC2 and WFC3 detectors. We can clearly see ∼ 10 high-mass stars bright in the U-band, Hα, and IR-band within the Kitt Peak National Observatory (KPNO) Hα contours. ...
Context 4
... cloud-cloud collisions in M33GMC 37 can create ∼10 high-mass stars at most. This is consistent with ∼10 stars that are detected by HST optical images within the KPNO Hα boundary (see Figure 5). ...

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