E. Gjerløw
A5107271674- Geophysics and Gravity Measurements
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Solar and Space Plasma Dynamics
- Wireless Communication Networks Research
- Black Holes and Theoretical Physics
- Radio Astronomy Observations and Technology
- Blind Source Separation Techniques
University of Oslo
2020-2024
Cosmic birefringence is a parity-violating effect that might have rotated the plane of linearly polarized light cosmic microwave background (CMB) by an angle $β$ since its emission. This has recently been measured to be non-zero at statistical significance $3.6σ$ in official Planck PR4 and 9-year WMAP data. In this work, we constrain using reprocessed BeyondPlanck LFI Cosmoglobe DR1 polarization maps. These novel maps both lower systematic residuals more complete error description than...
We constrain the spectral index of polarized synchrotron emission, $β_s$, by correlating recently released 2.3 GHz S-Band Polarization All Sky Survey (S-PASS) data with 23 9-year Wilkinson Microwave Anisotropy Probe (WMAP) sky maps. subdivide S-PASS field, which covers southern ecliptic hemisphere, into 95 $15^{\circ}\times15^{\circ}$ regions and estimate emission within each region using a simple but robust T-T plot technique. Three different versions are considered, corresponding to: no...
We present the first model of full-sky polarized synchrotron emission that is derived from all WMAP and Planck LFI frequency maps. The basis this analysis set end-to-end reprocessed C OSMOGLOBE Data Release 1 (DR1) sky maps presented in a companion paper, which have significantly lower instrumental systematics than legacy products each experiment. find resulting amplitude map has an average noise rms per 2° full width at half maximum (FWHM) beam 3.2 μK 30 GHz. This 30% recently released B...
Future cosmic microwave background (CMB) experiments are primarily targeting a detection of the primordial $B$-mode polarisation. The faintness this signal requires exquisite control systematic effects which may bias measurements. In work, we derive requirements on relative calibration accuracy overall polarisation gain ($\Delta g_\nu$) for LiteBIRD experiment, through application blind Needlet Internal Linear Combination (NILC) foreground-cleaning method. We find that minimum variance...
We present the first model of full-sky polarized synchrotron emission that is derived from all WMAP and Planck LFI frequency maps. The basis this analysis set end-to-end reprocessed Cosmoglobe Data Release 1 sky maps presented in a companion paper, which have significantly lower instrumental systematics than legacy products each experiment. find resulting amplitude map has an average noise rms $3.2\,\mathrm{μK}$ at 30 GHz $2^{\circ}$ FWHM, 30% recently released BeyondPlanck included only...