ﻻ يوجد ملخص باللغة العربية
We present the results of a high resolution near infrared adaptive optics survey of the young obscured star forming region NGC 2024. Out of the total 73 stars detected in the adaptive optics survey of the cluster, we find 3 binaries and one triple. The resulting companion star fraction, 7+/-3% in the separation range of 0.35-2.3 (145-950 AU), is consistent with that expected from the multiplicity of mature solar-type stars in the local neighborhood. Our survey was sensitive to faint secondaries but no companions with Delta K > 1.2 magnitudes are detected within 2 of any star. The cluster has a K luminosity function that peaks at ~12, and although our completeness limit was 17.7 magnitude at K, the faintest star we detect had a K magnitude of 16.62.
The properties of high redshift quasar host galaxies are studied, in order to investigate the connection between galaxy evolution, nuclear activity, and the formation of supermassive black holes. We combine new near-infrared observations of three hig
The high angular resolution and dynamic range achieved by the NACO adaptive optics system on the VLT is an excellent tool to study the morphology of Planetary Nebulae (PNe). We observed four stars in different evolutionary stages from the AGB to the
We report near-infrared (primarily H-band) adaptive optics (AO) imaging with the Gemini-N and Subaru Telescopes, of a representative sample of 32 nearby (z<0.3) QSOs selected from the Palomar-Green (PG) Bright Quasar Survey (BQS), in order to investi
We present K-band $lambda/Deltalambda$ ~ 2600 spectroscopy of five stars (K ~ 14 - 16 mag) within 0.5 of Sgr A*, the radio source associated with the compact massive object suspected to be a 2.6 x 10$^{6}$ msun black hole at the center of our Galaxy.
We investigate the star formation activity in a young star forming cluster embedded at the edge of the RCW 41 HII region. As a complementary goal, we aim at demonstrating the gain provided by Wide-Field Adaptive Optics instruments to study young clus