Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007rmxac..28..134m&link_type=abstract
The 3rd Mexico-Korea Conference on Astrophysics: Telescopes of the Future and San Pedro Mártir (Eds. Stan Kurtz, José Franco, Se
Astronomy and Astrophysics
Astrophysics
X-Rays: Binaries, Instrumentation: Spectrographs
Scientific paper
Recently many new hard X-ray (e.g., 15-60 keV) sources have been discovered by X-ray satellites, especially by the INTEGRAL satellite equipped with a hard X-ray/soft gamma-ray observing capability. These new hard X-ray sources sometimes reveal enormous extinction of NH ≃ 1024 cm-2 which is why they have been hidden. They are usually highly-obscured X-ray binaries or active galactic nuclei of which soft X-ray emission (and also most of the ultra-violet and optical) is obscured by the surrounding medium. I introduce on-going observational efforts to study these new sources, especially the X-ray binaries, as well as a new near-infrared spectrograph for the Keck I telescope optimized for deciphering the nature of these new, heavily-obscured, hard X-ray sources.
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