Molecular Hydrogen toward zeta ORI A

Details Molecular Hydrogen toward zeta ORI A Molecular Hydrogen toward zeta ORI A

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.0706j&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #07.06; Bulletin of the American Astronomical Society, Vol. 28, p.833

Other

1

Scientific paper

Over 50 absorption features from the Lyman and Werner bands of interstellar H_2 were observed in the uv spectrum of zeta Ori A by the Interstellar Medium Absorption Profile Spectrograph (IMAPS) on the ORFEUS-SPAS I orbital mission in September 1993. Hydrogen molecules are found mostly in two prominent velocity components: one has log N(H_2)=14.5, an average rotational temperature (for J=0-5) T_rot=950K and a heliocentric radial velocity v_sun~ 0 km s(-1) , while the other has log N(H_2)=15.9, T_rot=320K and v_sun=25 km s(-1) . The component near 0 km s(-1) has the unusual property of showing a steady increase in the width of the velocity profile as J increases from 0 to 5, coupled with a small shift ( ~ 2 km s(-1) ) in the profile's center toward negative velocities. This behavior is not consistent with the conventional picture that the excitation is caused by optical pumping by uv starlight photons. We suggest that the H_2 in this component is forming in a gas region that is undergoing recombination, cooling and compression behind a bow shock created by the collision of a high (negative) velocity gas flow and a stationary cloud.

Affiliated with

Also associated with

No associations

Rating

Molecular Hydrogen toward zeta ORI A 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 Molecular Hydrogen toward zeta ORI A, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Molecular Hydrogen toward zeta ORI A will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1351874