Star formation properties of spiral galaxies
Authors: Kandalyan, R.A.; Al-Naimiy, H.M.K.; Khassawneh, A.M.
Source: Astrophysics and Space Science, Volume 273, Numbers 1-4, September 2000 , pp. 103-115(13)
Abstract:The gas properties of barred and unbarred spiral galaxies are compared in two complete samples. It is found that two types of spiral galaxies do not differ to each other in atomic and molecular gas contents. On average there is 6 times more HI than H_2 in spiral galaxies and the ratio MHI/MH2 decreases from early to late types. The barred and unbarred spirals in general show a similar behaviors of the gas-to-luminosity relationships, but also there are certain differences between them such as correlation of two gas phases (HI and H_2) for unbarred galaxies. It is suggested that different behaviors of two types galaxies are due to the higher star forming activity of barred with respect unbarred spirals. The expected values of HI and H_2 gas contents have been estimated using blue and far-infrared emission.
Document Type: Regular Paper
Affiliations: Institute of Astronomy and Space Sciences Al al-Bayt University, Mafraq, Jordan
Publication date: September 2000