A T N F    D a i l y    A s t r o n o m y    P i c t u r e

3rd of September 2020
HI intensity mapping with a PAF on Parkes
by Li et al.
The 21cm neutral hydrogen (HI) spectral line can be detected from galaxies in the nearby universe, but is too faint to detect from individual galaxies at even moderate redshifts. However, three-dimensional intensity mapping allows the study of large-scale structure directly by detecting the aggregate emission from many galaxies in a large volume. Li et al. report results from a neutral hydrogen (HI) intensity mapping survey conducted with a Phased Array Feed (PAF) on the Parkes telescope in 2016. The full survey was designed to cover 380 square degrees over the redshift range 0.3 < z < 1 in four fields covered by the WiggleZ Dark Energy Survey. The image above shows the Parkes PAF intensity mapping survey coverage (red), overlaid on the WiggleZ dark energy survey footprint (blue). The paper reports the detection of a cross-correlation signal between the HI intensity maps and the WiggleZ redshift data.

<<   |   archive   |   about   |   today   *   ATNF   |   Parkes   |   ATCA   |   Mopra   |   VLBI   |   ASKAP   |   >>