The giant spiral galaxy M101: I. A high resolution map of the neutral hydrogen.
Abstract
Summary. This paper presents a preliminary map of the distribution of neutral hydrogen in the Sc I galaxy M 101, with 25" x 30" resolution. The H i is mostly arranged in narrow elongated structures, which closely coincide with the spiral arms seen in optical photographs. Several major concentrations of H i coincide with giant H H regions and/or associations; these concentrations have sizes of I x 3 kpc and masses 40 x 106 M0. In the central parts of the system, no small-scale structure in the hydrogen is detecte The system used in the present observations becomes progressively less sensitive to structures on angular scales larger than about I0' Key words: neutral hydrogen - spiral galaxy - M 101
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- 1973
- Bibcode:
- 1973A&A....29..447A