Search Publications
Revisiting the dichotomy of early-type galaxies
Hao, Cai-Na; Xia, Xiao-Yang; He, Yan-Qin
We study the relationship between isophotal shapes, central light profiles and kinematic properties of early-type galaxies (ETGs) based on a compiled sample of 184 ETGs. These sample galaxies are included in Data Release 8 of the Sloan Digital Sky Survey and have central light profiles and kinematic properties available from the literature, which …
Investigation of star formation toward the Sharpless 155 H II region
Fan, Zhou; Li, Jin-Zeng; Huang, Ya-Fang +1 more
We present a comprehensive study of star formation toward the H II region Sharpless 155 (S155). Star-formation activities therein were investigated based on multi-wavelength data from optical to the far-infrared. The surface density distribution of selected 2MASS sources toward S155 indicates the existence of a compact cluster, which is spatially …
A study of the relation between intensity oscillations and magnetic field parameters in a sunspot: Hinode observations
Venkatakrishnan, P.; Kumar, Brajesh; Mathew, Shibu K. +2 more
We present properties of intensity oscillations of a sunspot in the photosphere and chromosphere using G band and Ca II H filtergrams from Hinode. Intensity power maps as function of magnetic field strength and frequency reveal reduction of power in the G band with an increase in photospheric magnetic field strength at all frequencies. In Ca II H,…
Long term optical variability of bright X-ray point sources in elliptical galaxies
Shalima, P.; Jithesh, V.; Jeena, K. +3 more
We present long term optical variability studies of bright X-ray sources in four nearby elliptical galaxies with the Chandra Advanced CCD Imaging Spectrometer array (ACIS-S) and observations from the Hubble Space Telescope (HST) Advanced Camera for Surveys. Out of the 46 bright (X-ray counts > 60) sources that are in the common field of view of…