Radio Properties Of OH Megamaser Galaxies

Astronomical masers are extremely non-thermal equilibrium phenomena and provide us with an excellent tool for studying some special astronomical environments,especially the physics and dynamics of small-scale environments.The Very Long Baseline Interferometry(VLBI)has been widely used in the observation of maser spectral lines,thus providing a powerful means for the study of the spatial distribution of maser sources and their kinematics.Our work mainly conducted VLBI observations on two OHM host galaxies IRAS 02524+2046 and IRAS 10173+0828 to further study their radio properties.EVN and VLBA provide us with the necessary sensitivity and angular resolution to use their observed data to study the nuclei and circumnuclear regions of these two galaxies and to further study their radio properties systematically.In this work,the current research status of OHM and the research progress in this field are firstly summarized through EVN and VLBA observation of OH mainline maser emission of two OHM sample sources,VLBI observation of IRAS 02524+2046 continuum and OH line emission results,and VLA archived data showing the angular second scale radio characteristics of this galaxy.Study found now in VLBI observations found no obvious radio emission in a row,galactic nuclei in the classification of the three key indicators of radio activity(radio spectrum index,brightness temperature and the ratio of FIR and radio flux density q),are consistent with the source for the classification of the starburst galaxy,look from the optical configuration,this may be evidence of the galaxy in the stage of integration.To IRAS 10173+0828 sources,we also collected VLA and MERLIN archive data to study the characteristics of radio(VLA)on the multi-band radio continuous spectrum observation of data reduction we deal with the use of the NRAO Astronomical Image Processing System(AIPS)and Common Astronomy Software Application(CASA)software get FITS file,and then to mapping the FITS files with DIFFMAP software,in order to obtain flow density.For the source with four kinds of model fitting for the(synchrotron)and hot(free-free)radiation law,studies the continuous spectrum,found the spectral index is about 0.38,the thermal emission is the main radiation process these results indicate that the source of the radio emission may come mainly from radio-AGN activity,free-free emission may also have a small amount of contribution.