GS34-6+65: A Large Galactic Supershell Originating in an Active Star Formation Region and Extending to the Halo

Details GS34-6+65: A Large Galactic Supershell Originating in an Active Star Formation Region and Extending to the Halo GS34-6+65: A Large Galactic Supershell Originating in an Active Star Formation Region and Extending to the Halo

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.3612m&link_type=abstract

American Astronomical Society, 186th AAS Meeting, #36.12; Bulletin of the American Astronomical Society, Vol. 27, p.864

Astronomy and Astrophysics

Astrophysics

Scientific paper

The Galactic supershell GS34-6+65 (Heiles 1979) was mapped in the H{I}; 21 cm emission line with the NRAO 140 ft radiotelescope. The observations cover galactic longitudes 30(deg) ; to 40(deg) ; and latitudes -1(deg) ; to -15(deg) ; with 10 arcmin spacing in both coordinates. Centered at l=35, b=-5 and v_rad=+56km/s, the supershell consists of an irregular spherical shell about 7(deg) ; in diameter, which reaches 9.5(deg) ; below the galactic plane, and of a well defined, massive cone at low latitudes which connects to the molecular cloud CO[35,44] (Dame et al.1986) through a narrow (20 pc wide) channel of reduced H{I}; emission. On the basis of an investigation of objects near the line of sight to the supershell and information from the galactic rotation curve, we derive a distance of ~ 3.7 kpc, which implies that the shell has a diameter of ~ 450 pc and extends at least 600 pc into the Galactic halo. The distance also indicates that the supershell originates in the Sagittarius arm. The concentration of supernova remnants, star forming regions and H{II}; regions in this direction implies that the supershell is a remnant of multiple supernovae and that strong star formation activity persists in this region of the Galaxy, though the large column density (greater than 10(22) H/cm(2) ) prevents us from seeing the stars. We interpret W48 as a region of star formation induced by a shock wave related to the cone. We consider simple models to take into account geometrical and dynamical effects resulting in observed H{I}; emission at given radial velocity. We estimate the swept up mass in the shell to be 7.3*E(4) Msun ; and the mass in the cone -- 1.3*E(5) Msun ;. The estimated kinetic energy of the supershell, 5.0*E(51) ergs, imposes a minimicrons limit of about 5.0*E(52) ergs on the total energy of the event creating the supershell. REFERENCES: Dame, T. M., Elmegreen, B. G., Cohen, R. S., Thaddeus, P. 1986, Astroph. Journ., 305, 892 Heiles, C. 1979, Astroph. Journ., 229, 533

Affiliated with

Also associated with

No associations

Rating

GS34-6+65: A Large Galactic Supershell Originating in an Active Star Formation Region and Extending to the Halo does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with GS34-6+65: A Large Galactic Supershell Originating in an Active Star Formation Region and Extending to the Halo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and GS34-6+65: A Large Galactic Supershell Originating in an Active Star Formation Region and Extending to the Halo will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-882514