X‐Ray Observations of Markarian 231
نویسندگان
چکیده
منابع مشابه
High Spatial Resolution Hst/nicmos Observations of Markarian 231
Observations of Markarian 231 at 1.1 µm taken with NICMOS on the Hubble Space Telescope are described. The brightness of the object in the near infrared and the inherent short-term stability of the NICMOS optical and instrumental system enables application of special observational and analysis techniques that effectively increase high spatial resolution. By these means, we set an upper limit on...
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Observations of Markarian 231 at 1.1 mm taken with NICMOS on the Hubble Space Telescope are described. The brightness of the object in the near-infrared, and the inherent short-term stability of the NICMOS optical and instrumental system, enables the application of special observational and analysis techniques that effectively increase high spatial resolution. By these means, we set an upper li...
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متن کاملOH megamasers , starburst and AGN activity in Markarian 231
We present MERLIN observations of OH maser and radio continuum emission within a few hundred pc of the core of the Ultra Luminous IR Galaxy Markarian 231. This is the only known OH megamaser galaxy classed as a Seyfert 1. Maser emission is identified with the 1665and 1667-MHz transitions over a velocity extent of 720 km s. Both lines show a similar position-velocity structure including a gradie...
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The BL Lac object Mrk 421 was observed on May 25, 2000 during the XMM−Newton Cal/PV phase. The high throughput of the X-ray telescopes and the spectral capabilities of the instruments allow an uninterrupted temporal and spectral study of the source with unprecedented time resolution. Mrk 421 was found at a relatively high state with a 2−6 keV flux of (1.3−1.9)×10−10 erg cm−2 s−1. The observed i...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1999
ISSN: 0004-637X,1538-4357
DOI: 10.1086/306674