The Effelsberg Bonn HI Survey EBHIS

TL;DR

The EBHIS provides a comprehensive, high-sensitivity survey of neutral hydrogen across the northern sky, improving upon previous surveys with advanced instrumentation and RFI mitigation, enabling detailed studies of the Milky Way and local universe.

Contribution

This survey introduces a fully sampled, high-sensitivity HI survey with FPGA spectrometers, offering improved data quality and RFI resistance over prior efforts.

Findings

Exceeds HIPASS sensitivity across the survey area.

Offers an order of magnitude higher mass sensitivity in SDSS regions.

Provides high-quality data for Milky Way and extragalactic astrophysics.

Abstract

The Effelsberg-Bonn HI Survey (EBHIS) covers the whole sky north of Dec(2000) = -5 deg. on a fully sampled angular grid. Using state-of-the-art FPGA-spectrometers we perform a Milky Way and an extragalactic HI survey in parallel. Moreover, the high dynamic range and short dump time of the HI spectra allow to overcome the vast majority of all radio-frequency-interference (RFI) events. The Milky Way data will be corrected for the stray-radiation bias which warrants a main-beam efficiency of 99%. Towards the whole survey area we exceed the sensitivity limit of HIPASS, while towards the Sloan-Digital-Sky-Survey (SDSS) area EBHIS offers an order of magnitude higher mass sensitivity. The Milky Way data will be a cornerstone for multi-frequency astrophysics, while the extragalactic part will disclose detailed information on the structure formation of the local universe.