Panchromatic properties of the extreme Fe ii emitter PHL 1092
نویسندگان
چکیده
منابع مشابه
PHL 1092 as a transient extreme X–ray weak quasar
We report a dramatic variability event in the X–ray history of the Narrow–Line quasar PHL 1092 (z = 0.396). Our latest 2008 XMM–Newton observation reveals a flux drop of ∼ 200 with respect to the previous observation performed about 4.5 years earlier, and a drop of ∼ 135 with respect to its historical flux. Despite the huge X–ray variation, the UV flux remains constant producing a very signific...
متن کاملROSAT HRI monitoring of extreme X - ray variability in the narrow - line quasar PHL 1092
We report results from an 18-day ROSAT HRI monitoring campaign on the ultrasoft Narrow-Line Seyfert 1 (NLS1) class quasar PHL 1092. This luminous, radio-quiet quasar showed strong X-ray variability in a short ROSAT PSPC observation, and ROSAT HRI monitoring of the similar object IRAS 13224–3809 revealed extreme variability on intermediate timescales. We wanted to determine whether remarkable X-...
متن کاملVariability In The Narrow - Line QSO PHL 1092
A ROSAT observation of the narrow-line Fe II QSO PHL 1092 shows rapid variability that requires an efficiency of at least 0.13, exceeding the theoretical maximum for an accretion disk around a non-rotating black hole. Plausible explanations for this high efficiency incorporate anisotropic emission and/or accretion onto a rapidly rotating black hole, the latter recently suggested by Kwan et al. ...
متن کاملcontrol of the optical properties of nanoparticles by laser fields
در این پایان نامه، درهمتنیدگی بین یک سیستم نقطه کوانتومی دوگانه(مولکول نقطه کوانتومی) و میدان مورد مطالعه قرار گرفته است. از آنتروپی ون نیومن به عنوان ابزاری برای بررسی درهمتنیدگی بین اتم و میدان استفاده شده و تاثیر پارامترهای مختلف، نظیر تونل زنی(که توسط تغییر ولتاژ ایجاد می شود)، شدت میدان و نسبت دو گسیل خودبخودی بر رفتار درجه درهمتنیدگی سیستم بررسی شده اشت.با تغییر هر یک از این پارامترها، در...
15 صفحه اولAn intense soft - excess and evidence for light bending in the luminous narrow - line quasar PHL 1092
The narrow-line quasar PHL 1092 was observed by XMM-Newton at two epochs separated by nearly thirty months. Timing analyses confirm the extreme variability observed during previous X-ray missions. A measurement of the radiative efficiency is in excess of what is expected from a Schwarzschild black hole. In addition to the rapid X-ray variability, the short UV light curves (< 4 hours) obtained w...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2020
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/staa934