The HI supershell GS 118+01-44 and its role in the interstellar medium

Abstract

We carry out a multiwavelength study to characterize the HI supershell designated GS 118+01-44, and to analyse its possible origin. A multiwavlength study has been carried out to study the supershell and its environs. We performed an analysis of the HI, CO, radio continuum, and infrared emission distributions. The Canadian Galactic Plane Survey (CGPS) HI data reveals that GS 118+01-44 is centred at (l, b) = (117.7, 1.4) with a systemic velocity of -44.3 km/s. According to Galactic rotation models this structure is located at 3.0 +- 0.6 kpc from the Sun. There are several HII regions and three supernova remnants (SNRs) catalogued in the region. On the other hand, the analysis of the temperature spectral index distribution shows that in the region there is a predominance of non-thermal emission. Infrared emission shows that cool temperatures dominate the area of the supershell. Concerning the origin of the structure, we found that even though several OB stars belonging to Cas OB5 are located in the interior of GS 118+01-44, an analysis of the energy injected by these stars through their stellar winds indicates that they do not have sufficient energy to create GS 118+01-44. Therefore, an additional energy source is needed to explain the genesis of GS 118+01-44. On the other hand, the presence of several HII regions and young stellar object candidates in the edges of GS 118+01-44 shows that the region is still active in forming new stars.

11 pages, 11 figures, accepted for publication in A&A

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• The WISE Catalog of Galactic HII Regions
• The empirical metallicity dependence of the mass-loss rate of O- and early B-type stars
• Simulations of magnetized multiphase galactic disk regulated by supernovae explosions
• Calibration of the AKARI Far-infrared All Sky Survey Maps
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Cited by in corpus (4)

• A Catalog of Holes and Shells in the Interstellar Medium of the LITTLE THINGS Dwarf Galaxies
• Massive stars in the SDSS-IV/APOGEE SURVEY. I- OB stars
• Radio study of HESS J1857+026. Gamma-rays from a superbubble?
• Studying the interstellar medium to look for relics of triggered star formation among stellar clusters