LOFAR discoveryof radio emission in MACS J0717.5+3745

نویسندگان
چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Polarized radio emission from extensive air showers measured with LOFAR

We present LOFAR measurements of radio emission from extensive air showers. We find that this emission is strongly polarized, with a median degree of polarization of nearly 99%, and that the angle between the polarization direction of the electric field and the Lorentz force acting on the particles, depends on the observer location in the shower plane. This can be understood as a superposition ...

متن کامل

Diffuse radio emission in the merging cluster MACS J 0717 . 5 + 3745 : the discovery of the most powerful radio halo

Context. Hierarchical models of structure formation predict that galaxy clusters grow via mergers of smaller clusters and galaxy groups, as well as through continuous accretion of gas. MACS J0717.5+3745 is an X-ray luminous and complex merging cluster, located at a redshift of 0.5548. The cluster is suspected to host a bright radio relic, but up until now no detailed radio observations have bee...

متن کامل

LOFAR, a new low frequency radio telescope

LOFAR, the Low Frequency Array, is a large radio telescope consisting of approximately 100 soccer-field sized antenna stations spread over a region of 400 km in diameter. It will operate at frequencies from ∼ 10 to 240 MHz, with a resolution at 240 MHz of better than an arcsecond. Its superb sensitivity will allow for studies of a broad range of astrophysical topics, including reionisation, tra...

متن کامل

Removing Radio Frequency Interference in the LOFAR using GPUs

Faculteit Exacte Wetenschappen Department of Computer Science Master of Science Removing Radio Frequency Interference in the LOFAR using GPUs by Linus Schoemaker Radio Frequency Interference poses a large problem for analysing data gathered by modern, large radio telescopes such as LOFAR. Detecting and removing this RFI online is necessary as telescopes are in almost continuous operation. While...

متن کامل

Measuring a Cherenkov ring in the radio emission from air showers at 110-190 MHz with LOFAR

1 ar X iv :1 41 1. 68 65 v1 [ as tr oph .I M ] 2 5 N ov 2 01 4 Measuring radio emission from air showers offers a novel way to determine properties of the primary cosmic rays such as their mass and energy. Theory predicts that relativistic time compression effects lead to a ring of amplified emission which starts to dominate the emission pattern for frequencies above ∼ 100 MHz. In this article ...

متن کامل

ذخیره 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: 2018

ISSN: 0035-8711,1365-2966

DOI: 10.1093/mnras/sty1121