Optical Diffuse Light in Nearby Compact Groups
نویسندگان
چکیده
Analyses of B and R band observations of four compact groups reveal the presence of a considerable amount of diffuse, intergalactic light in two of them (HCG 79 and HCG 95). The diffuse component is presumably due to stellar material that has been tidally stripped from the galaxy group members. A new approach is used to measure this diffuse background light, using wavelet techniques for detecting low surface brightness signals. The diffuse light component has a mean colour of (B − R) = 1.4 – 1.5±0.1 and it comprises the following fractions of the total group light in the B band: 18%, 12%, 3% and 0% for groups HCG 95, HCG 79, HCG 92 and HCG 88, respectively. The diffuse light content of a group may represent an efficient tool for the determination of how long groups have been together in a compact configuration.
منابع مشابه
Performance of the Wavelet Transform-Neural Network Based Receiver for DPIM in Diffuse Indoor Optical Wireless Links in Presence of Artificial Light Interference
Artificial neural network (ANN) has application in communication engineering in diverse areas such as channel equalization, channel modeling, error control code because of its capability of nonlinear processing, adaptability, and parallel processing. On the other hand, wavelet transform (WT) with both the time and the frequency resolution provides the exact representation of signal in both doma...
متن کاملIntragroup diffuse light in compact groups of galaxies II . HCG 15 , 35 and 51
This continuing study of intragroup light in compact groups of galaxies aims to establish new constraints to models of formation and evolution of galaxy groups, specially of compact groups, which are a key part in the evolution of larger structures, such as clusters. In this paper we present three additional groups (HCG 15, 35 and 51) using deep wide field B and R band images observed with the ...
متن کاملComparison of Photocatalytic Activities of Two Different Dyes Using Pt-Modified TiO2 Nanoparticles under Visible Light
The photocatalytic degradation of Acid Red 91 (AR91) and Acid Yellow 23 (AY23) with different molecular structures and different substitute groups using Pt modified TiO2 (PtTiO2 ) nanoparticles was investigated in the presence of visible light irradiation. Pt-TiO2 nanoparticles were prepared with photodiposition method (PD) and characterized by X-ray diffraction (XRD), scanning electron microgr...
متن کاملPossible Local Spiral Counterparts to Compact Blue Galaxies at Intermediate Redshift
We identify nearby disk galaxies with optical structural parameters similar to those of intermediateredshift compact blue galaxies. By comparing H I and optical emission-line widths, we show that the optical widths substantially underestimate the true kinematic widths of the local galaxies. By analogy, optical emission-line widths may underrepresent the masses of intermediate-z compact objects....
متن کاملRe - analysis of ROSAT - PSPC X -
We carefully reanalyze the ROSAT PSPC X-ray spectro-photometric observations of HCG 16 (Arp 318) and compare them to optical and radio data. We detect diffuse emission in six regions filling half of the 8 radius circle around the optical center of the group: one region encompassing galaxies a & b, two regions surrounding the group galaxies c & d, one associated with a background radio-source, o...
متن کامل