MURAL - Maynooth University Research Archive Library



    Exploring cosmic origins with CORE: Effects of observer peculiar motion


    Trappe, Neil (2018) Exploring cosmic origins with CORE: Effects of observer peculiar motion. Journal of Cosmology and Astroparticle Physics, 2018 (04). 021. ISSN 1475-7516

    [img]
    Preview
    Download (7MB) | Preview


    Share your research

    Twitter Facebook LinkedIn GooglePlus Email more...



    Add this article to your Mendeley library


    Abstract

    We discuss the effects on the cosmic microwave background (CMB), cosmic infrared background (CIB), and thermal Sunyaev-Zeldovich effect due to the peculiar motion of an observer with respect to the CMB rest frame, which induces boosting effects. After a brief review of the current observational and theoretical status, we investigate the scientific perspectives opened by future CMB space missions, focussing on the Cosmic Origins Explorer (CORE) proposal. The improvements in sensitivity offered by a mission like CORE, together with its high resolution over a wide frequency range, will provide a more accurate estimate of the CMB dipole. The extension of boosting effects to polarization and cross-correlations will enable a more robust determination of purely velocity-driven effects that are not degenerate with the intrinsic CMB dipole, allowing us to achieve an overall signal-to-noise ratio of 13; this improves on the Planck detection and essentially equals that of an ideal cosmic-variance-limited experiment up to a multipole ℓ ##IMG## [http://ej.iop.org/icons/Entities/simeq.gif] simeq 2000. Precise inter-frequency calibration will offer the opportunity to constrain or even detect CMB spectral distortions, particularly from the cosmological reionization epoch, because of the frequency dependence of the dipole spectrum, without resorting to precise absolute calibration. The expected improvement with respect to COBE-FIRAS in the recovery of distortion parameters (which could in principle be a factor of several hundred for an ideal experiment with the CORE configuration) ranges from a factor of several up to about 50, depending on the quality of foreground removal and relative calibration. Even in the case of ##IMG## [http://ej.iop.org/icons/Entities/simeq.gif] simeq 1 % accuracy in both foreground removal and relative calibration at an angular scale of 1 o , we find that dipole analyses for a mission like CORE will be able to improve the recovery of the CIB spectrum amplitude by a factor ##IMG## [http://ej.iop.org/icons/Entities/simeq.gif] simeq 17 in comparison with current results based on COBE-FIRAS. In addition to the scientific potential of a mission like CORE for these analyses, synergies with other planned and ongoing projects are also discussed.

    Item Type: Article
    Keywords: Exploring; cosmic origins; CORE; Effects; observer peculiar motion;
    Academic Unit: Faculty of Science and Engineering > Experimental Physics
    Item ID: 10235
    Identification Number: https://doi.org/10.1088/1475-7516/2018/04/021/meta
    Depositing User: Dr. Neil Trappe
    Date Deposited: 20 Nov 2018 17:08
    Journal or Publication Title: Journal of Cosmology and Astroparticle Physics
    Publisher: IOP Publishing
    Refereed: No
    URI:

    Repository Staff Only(login required)

    View Item Item control page

    Downloads

    Downloads per month over past year