G. Thuma - Academia.edu (original) (raw)
Related Authors
Jet Propulsion Laboratory, California Institute of Technology
Uploads
Papers by G. Thuma
Astronomy & Astrophysics - ASTRON ASTROPHYS, 2000
The starburst galaxy M 82 has been mapped at lambda 1.2 mm using the IRAM 30-m telescope and the ... more The starburst galaxy M 82 has been mapped at lambda 1.2 mm using the IRAM 30-m telescope and the MPIfR 19-channel bolometer. The influence of the sidelobe pattern and the 12CO(2-1) line has been carefully analyzed. Based on this analysis, we conclude that the cold dust does not extend far into the halo as has been previously claimed. The total mass of dust in the inner 3 kpc of the galaxy is 7.5 * 106 M_sun. Assuming a solar gas-to-dust ratio, the inferred total mass of gas is 7.5 * 108 Msun. Unlike in any other galaxy we find the CO(2-1) line emission to be clearly more extended than the lambda 1.2 mm dust emission. A likely explanation for this exceptional behaviour, seen for the first time in galaxies, is heating of molecular gas by low-energy cosmic rays and soft X-rays in the halo of M 82.
Astronomy and Astrophysics, 2001
Astronomy and Astrophysics, 2002
We present imaging of molecular gas emission in the star-forming spiral galaxy NGC 6946. Our 12 C... more We present imaging of molecular gas emission in the star-forming spiral galaxy NGC 6946. Our 12 CO(1-0) and 12 CO(3-2) images, made at 22 ′′ resolution with the IRAM 30-m and the Heinrich Hertz 10-m radio telescopes, are the most extensive observations of molecular gas in this galaxy and are among the most extensive observations of molecular gas in any spiral galaxy.
Astronomy & Astrophysics - ASTRON ASTROPHYS, 2000
The starburst galaxy M 82 has been mapped at lambda 1.2 mm using the IRAM 30-m telescope and the ... more The starburst galaxy M 82 has been mapped at lambda 1.2 mm using the IRAM 30-m telescope and the MPIfR 19-channel bolometer. The influence of the sidelobe pattern and the 12CO(2-1) line has been carefully analyzed. Based on this analysis, we conclude that the cold dust does not extend far into the halo as has been previously claimed. The total mass of dust in the inner 3 kpc of the galaxy is 7.5 * 106 M_sun. Assuming a solar gas-to-dust ratio, the inferred total mass of gas is 7.5 * 108 Msun. Unlike in any other galaxy we find the CO(2-1) line emission to be clearly more extended than the lambda 1.2 mm dust emission. A likely explanation for this exceptional behaviour, seen for the first time in galaxies, is heating of molecular gas by low-energy cosmic rays and soft X-rays in the halo of M 82.
Astronomy and Astrophysics, 2001
Astronomy and Astrophysics, 2002
We present imaging of molecular gas emission in the star-forming spiral galaxy NGC 6946. Our 12 C... more We present imaging of molecular gas emission in the star-forming spiral galaxy NGC 6946. Our 12 CO(1-0) and 12 CO(3-2) images, made at 22 ′′ resolution with the IRAM 30-m and the Heinrich Hertz 10-m radio telescopes, are the most extensive observations of molecular gas in this galaxy and are among the most extensive observations of molecular gas in any spiral galaxy.