We observed a 17′×17′ region of the ρ Oph molecular cloud, using the ACIS-I array onboard the Chandra X-ray Observatory (CXO). A 100-ks exposure observation revealed ∼ 100 X-ray sources above the detection limit of ∼ 10 ergs s. About 2/3 of the X-ray sources are identified with an optical and/or infrared counterpart, including significant numbers of Class I, II and III sources and a few brown d...

We observed a 17×17 region of the ρ Oph molecular cloud, using the ACIS-I array onboard the Chandra X-ray Observatory (CXO). A 100-ks exposure observation revealed ∼ hundred X-ray sources above the detection limit of ∼ 10 ergs s. About 2/3 of the X-ray sources are identified to an optical and/or infrared counterpart, including significant numbers of class I, II and III sources and a few brown d...

We observed a 17×17 region of the ρ Oph molecular cloud, using the ACIS-I array onboard the Chandra X-ray Observatory (CXO). A 100-ks exposure observation revealed ∼ 100 X-ray sources above the detection limit of ∼ 10 ergs s. About 2/3 of the X-ray sources are identified with an optical and/or infrared counterpart, including significant numbers of Class I, II and III sources and a few brown dwa...

Recently, we developed a soft X-ray microscope called the scanning-electron generation X-ray microscope (SGXM), which consists of a simple X-ray detection system that detects X-rays emitted from the interaction between a scanning electron beam (EB) and the thin film of the sample mount. We present herein a three-dimensional (3D) X-ray detection system that is based on the SGXM technology and de...