Probing Molecular Gas, Dust and Far-ultraviolet Emission Across the Disc of the Spiral Galaxy NGC 7331

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Topal S.

International Congress of Engineering and Natural Sciences Studies, Ankara, Turkey, 7 - 09 May 2021, pp.82

  • Publication Type: Conference Paper / Summary Text
  • City: Ankara
  • Country: Turkey
  • Page Numbers: pp.82
  • Van Yüzüncü Yıl University Affiliated: Yes


Molecular clouds (MCs) are the places for stars to be born and die. It is necessary to obtain

multiple emission lines to study the physics and kinematics of the MCs better. Carbon monoxide

(CO), the second most abundant molecule in the interstellar medium, is widely used to probe the star-forming

gas clouds. In this study, we probe the physics of the gas and dust across the disc of the

nearby spiral galaxy NGC 7331. Using the literature CO data, we selected 14 regions over the galaxy.

12CO(1-0) intensities, far-ultraviolet (FUV) and 24𝜇𝑚 flux density were obtained for all the regions.

CO intensities, gas mass, gas surface density, 24𝜇𝑚-to-FUV flux ratio (i.e. the extinction) increase up

to about 40" (≈ 3 kpc) from the centre and then start to decrease. There is a positive correlation

between many parameters studied, such as between the molecular gas mass and the extinction. Our

results indicate that the regions on the eastern side of the disc show some differences in the physical

parameters compared to the regions on the western side. This indicates that the star formation history

and physical properties of the interstellar medium could be different on either side of the disc.