Heidelberg 2022 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 2: Astrophysics / Exoplanets and Astrobiology
EP 2.1: Vortrag
Montag, 21. März 2022, 16:15–16:30, EP-H1
Cross-matching Low Frequency Array (LOFAR) Sources — •Lukas Böhme — Fakultät für Physik, Universität Bielefeld, Deutschland
Multi-frequency studies of the radio sky provide insight into the nature of the observed objects. To do so, I cross-match resolved and unresolved radio sources at different frequencies and angular resolutions.
The combination of several radio bands from the Low Frequency Array (LOFAR) and other radio telescopes with multi-frequency optical and infrared data allows for photometric redshift estimates, not only for LOFAR Two-metre Sky Survey (LoTSS) sources, but also for lower resolution LOFAR LBA Sky Survey (LoLSS) and NRAO VLA Sky Survey (NVSS) sources.
I present a new cross-matching algorithm incorporating the radio source extensions and apply it to the catalogues from LoLSS-PR, LoTSS-DR1, LoTSS-DR2 (LOFAR) and NVSS (VLA).
I study the number of components of LoLSS radio sources and their spectral properties. I find an average spectral index of α=−0.77±0.17 for sources matched in all surveys. This spectral index is flux density independent above S1400 = 30 mJy and appears to be redshift independent.