![]() ![]() 2001), which mapped the southern sky out to a radial velocity of ~ 13 000 km s -1 with the 64-m Parkes telescope. The first such project was the very successful H i Parkes All-Sky Survey (HIPASS, Barnes et al. With the development of 21-cm multibeam receivers in the late 1990s, it finally became feasible for the 100-m class single-dish observatories to survey significant portions of the sky with the resulting better angular resolution in reasonable amounts of observing time. However, the coarse angular resolution of LAB may cause significant uncertainties when it is applied to evaluating the intensity attenuation of unresolved sources. ![]() (2005) reveal the tremendous legacy value of the LAB: one of its most frequent uses is to correct high-energy observations for galactic foreground extinction. The references to the seminal article by Kalberla et al. The high-quality SR correction made the LAB survey one of the most important H i data bases to date. 2005) – the first full-sky Milky Way H i survey that was corrected for stray radiation (SR). 2005, for ) to form the Leiden/Argentine/Bonn Survey (LAB Bajaja et al. Outstanding in terms of sensitivity and sky coverage compared to any prior endeavor, the LDS was later merged with the Instituto Argentino de Radioastronomía Survey (IAR Arnal et al. In 2009 we initiated a new northern-hemisphere H i survey with the 100-m telescope at Effelsberg, Germany, to succeed the Leiden/Dwingeloo Survey (LDS Hartmann & Burton 1997) done with the 25-m Dwingeloo telescope. To maximize the usefulness of EBHIS data, we estimate uncertainties in the H i column density and brightness temperature distributions, accounting for systematic effects.ĮBHIS Milky Way HI data is only available at the CDS via anonymous ftp to ( 130.79.128.5) or via Most important, we provide a properly gridded Milky Way H i column density map in HEALPix representation. Data products are made available to the public in a variety of forms. Detailed analyses of the resulting data products show that EBHIS is not only outperforming LAB in terms of sensitivity and angular resolution, but also matches the intensity-scale of LAB extremely well, allowing EBHIS to be used as a drop-in replacement for LAB. EBHIS is corrected for stray radiation and employs frequency-dependent flux-density calibration and sophisticated baseline-removal techniques to ensure the highest possible data quality. MILKYS RF TOEM SOFTWAREState-of-the-art fast-Fourier-transform spectrometers provide the necessary data read-out speed, dynamic range, and spectral resolution to apply software radio-frequency interference mitigation. The use of a seven-beam L-band array made it feasible to perform this all-sky survey with a 100-m class telescope in a reasonable amount of observing time. We aim to substitute the northern-hemisphere part of the Leiden/Argentine/Bonn Milky Way H i survey (LAB) with this first EBHIS data release, which presents the H i gas in the Milky Way regime. It covers the whole northern sky out to a redshift of z ~ 0.07 and comprises H i line emission from the Milky Way and the Local Volume.Īims. The Effelsberg-Bonn H i Survey (EBHIS) is a new 21-cm survey performed with the 100-m telescope at Effelsberg. Lenz 1ġ Argelander-Institut für Astronomie (AIfA), Auf dem Hügel 71, 53121 Bonn, GermanyĢ Max-Planck-Institut für Radioastronomie (MPIfR), Auf dem Hügel 69, 53121 Bonn, GermanyĬontext.
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