8-10 June 2016
Asia/Bangkok timezone

Mapping the Milky Way galaxy from the observation of 21-cm spectral line from HI using SRT 4.5 m of NARIT

Jun 8, 2016, 11:45 AM
Room J1

Room J1

Oral presentaion Astronomy, Astrophysics and Cosmology session I


Mr Attasit Phakam (Khon Kaen University)


In this study, the preliminary results are presented about the studies of kinematics properties of rotation of our galaxy and mapping the Milky Way galaxy only on quadrant I which is observed from the emission lines of neutral hydrogen (HI) at frequency 1420 MHz. Those observed HI clouds lead us to calculate the radial velocity from a shift in frequency of HI’s cloud which is called Doppler effect. The radial velocities are used to calculate rotational velocities for plotting galaxy rotation curve and mapping Milky Way galaxy. The rotation curve of galaxy shows the value almost flat curve with increasing the distances. Moreover, the result of graph is used to study the distribution of mass in our galaxy. Scope of the study, HI spectrum is observed at galactic latitude 0° and from galactic longitude 25° to 85° with increasing 5° in each step. The parameter are used in this calculation as follows; the Sun’s velocity obits around the Galactic center is equal to 225 ±5 km/s and the Sun’s distance from Galactic center is equal to 8.34 ± 0.34 kpc respectively. We have used small radio telescope (SRT) of National Astronomical Research Institute of Thailand (NARIT) which has diameter 4.5 m. However, the radio telescope has some trouble in mechanic parts and is preparing to adjust the new receiver system in particular HI frequency. We hope to finish observation in the end of year 2016.

Primary author

Mr Attasit Phakam (Khon Kaen University)


Dr Kitiyanee Asanok (Khon Kaen University) Dr Phrudth Jaroenjittichai (NARIT)

Presentation materials