Browsing Institutt for teoretisk astrofysikk by Author "Ihle, Håvard Tveit"

Now showing items 21-34 of 34

  • COMAP Early Science. IV. Power Spectrum Methodology and Results 
    Ihle, Håvard Tveit; Borowska, Jowita; Cleary, Kieran A.; Eriksen, Hans Kristian Kamfjord; Foss, Marie Kristine; Harper, Stuart E.; Kim, Junhan; Lunde, Jonas Gahr Sturtzel; Philip, Liju; Rasmussen, Maren; Stutzer, Nils-Ole; Uzgil, Bade D.; Watts, Duncan; Wehus, Ingunn Kathrine; Bond, J. Richard; Breysse, Patrick C.; Catha, Morgan; Church, Sarah E.; Chung, Dongwoo T.; Dickinson, Clive; Dunne, Delaney A.; Gaier, Todd; Gundersen, Joshua Ott; Harris, Andrew I.; Hobbs, Richard; Lamb, James W.; Lawrence, Charles R.; Murray, Norman; Readhead, Anthony C. S.; Padmanabhan, Hamsa; Pearson, Timothy J.; Rennie, Thomas J.; Woody, David P. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    We present the power spectrum methodology used for the first-season COMAP analysis, and assess the quality of the current data set. The main results are derived through the Feed–Feed Pseudo-Cross-Spectrum (FPXS) method, ...
  • COMAP Early Science. V. Constraints and Forecasts at z ∼3 
    Chung, Dongwoo T.; Breysse, Patrick C.; Cleary, Kieran A.; Ihle, Håvard Tveit; Padmanabhan, Hamsa; Silva, Marta Bruno; Bond, J. Richard; Borowska, Jowita; Catha, Morgan; Church, Sarah E.; Dunne, Delaney A.; Eriksen, Hans Kristian Kamfjord; Foss, Marie Kristine; Gaier, Todd; Gundersen, Joshua Ott; Harper, Stuart E.; Harris, Andrew I.; Hensley, Brandon; Hobbs, Richard; Keating, Laura C.; Kim, Junhan; Lamb, James W.; Lawrence, Charles R.; Lunde, Jonas Gahr Sturtzel; Murray, Norman; Pearson, Timothy J.; Philip, Liju; Rasmussen, Maren; Readhead, Anthony C. S.; Rennie, Thomas J.; Stutzer, Nils-Ole; Uzgil, Bade D.; Viero, Marco P.; Watts, Duncan; Wechsler, Risa H.; Wehus, Ingunn Kathrine; Woody, David P. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    We present the current state of models for the z ∼ 3 carbon monoxide (CO) line intensity signal targeted by the CO Mapping Array Project (COMAP) Pathfinder in the context of its early science results. Our fiducial model, ...
  • COMAP Early Science. VI. A First Look at the COMAP Galactic Plane Survey 
    Rennie, Thomas J.; Harper, Stuart E.; Dickinson, Clive; Philip, Liju; Cleary, Kieran A.; Bond, Richard J.; Borowska, Jowita; Breysse, Patrick C.; Catha, Morgan; Cepeda-Arroita, Roke; Chung, Dongwoo T.; Church, Sarah E.; Dunne, Delaney A.; Eriksen, Hans Kristian Kamfjord; Foss, Marie Kristine; Gaier, Todd; Gundersen, Joshua Ott; Harris, Andrew I.; Hensley, Brandon; Hobbs, Richard; Ihle, Håvard Tveit; Lamb, James W.; Lawrence, Charles R.; Lunde, Jonas Gahr Sturtzel; Paladini, Roberta; Pearson, Timothy J.; Rasmussen, Maren; Readhead, Anthony C. S.; Stutzer, Nils-Ole; Watts, Duncan; Wehus, Ingunn Kathrine; Woody, David P. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    We present early results from the CO Mapping Array Project (COMAP) Galactic Plane Survey conducted between 2019 June and 2021 April, spanning 20° < ℓ < 40° in Galactic longitude and ∣b∣ < 1fdg5 in Galactic latitude with ...
  • COMAP Early Science. VII. Prospects for CO Intensity Mapping at Reionization 
    Breysse, Patrick C.; Chung, Dongwoo T.; Cleary, Kieran A.; Ihle, Håvard Tveit; Padmanabhan, Hamsa; Silva, Marta Bruno; Bond, J. Richard; Borowska, Jowita; Catha, Morgan; Church, Sarah E.; Dunne, Delaney A.; Eriksen, Hans Kristian Kamfjord; Foss, Marie Kristine; Gaier, Todd; Gundersen, Joshua Ott; Harris, Andrew I.; Hobbs, Richard; Keating, Laura; Lamb, James W.; Lawrence, Charles R.; Lunde, Jonas Gahr Sturtzel; Murray, Norman; Pearson, Timothy J.; Philip, Liju; Rasmussen, Maren; Readhead, Anthony C. S.; Rennie, Thomas J.; Stutzer, Nils-Ole; Viero, Marco P.; Watts, Duncan; Wehus, Ingunn Kathrine; Woody, David P. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    We introduce COMAP-EoR, the next generation of the Carbon Monoxide Mapping Array Project aimed at extending CO intensity mapping to the Epoch of Reionization. COMAP-EoR supplements the existing 30 GHz COMAP Pathfinder with ...
  • COMAP Early Science. VIII. A Joint Stacking Analysis with eBOSS Quasars 
    Dunne, Delaney A.; Cleary, Kieran A.; Breysse, Patrick C.; Chung, Dongwoo T.; Ihle, Håvard Tveit; Bond, J. Richard; Eriksen, Hans Kristian Kamfjord; Gundersen, Joshua Ott; Keating, Laura C.; Kim, Junhan; Lunde, Jonas Gahr Sturtzel; Murray, Norman; Padmanabhan, Hamsa; Philip, Liju; Stutzer, Nils-Ole; Tolgay, Doğa; Wehus, Ingunn Kathrine; Church, Sarah E.; Gaier, Todd; Harris, Andrew I.; Hobbs, Richard; Lamb, James W.; Lawrence, Charles R.; Readhead, Anthony C. S.; Woody, David P. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
  • COSMOGLOBE DR1 results: I. Improved Wilkinson Microwave Anisotropy Probe maps through Bayesian end-to-end analysis 
    Watts, Duncan; Basyrov, Artem; Eskilt, Johannes Røsok; Galloway, Mathew; Gjerløw, Eirik; Hergt, L.T.; Herman, Daniel Christopher; Ihle, Håvard Tveit; Paradiso, S.; Rahman, F.; Thommesen, Harald; Aurvik, Ragnhild; Bersanelli, M.; Bianchi, L.A.; Brilenkov, Maksym; Colombo, L.P.L.; Eriksen, Hans Kristian Kamfjord; Franceschet, C.; Fuskeland, Unni; Hensley, B.; Hoerning, G.A.; Lee, Katherine; Lunde, Jonas Gahr Sturtzel; Marins, A.; Nerval, S.K.; Patel, S.K.; Regnier, M.; San, Metin; Sanyal, S.; Stutzer, Nils-Ole; Verma, A.; Wehus, Ingunn Kathrine; Zhou, Y. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    We present C OSMOGLOBE Data Release 1, which implements the first joint analysis of WMAP and Planck LFI time-ordered data, processed within a single Bayesian end-to-end framework. This framework directly builds on a similar ...
  • COSMOGLOBE DR1 results: II. Constraints on isotropic cosmic birefringence from reprocessed WMAP and Planck LFI data 
    Eskilt, Johannes Røsok; Watts, Duncan; Aurvik, Ragnhild; Basyrov, Artem; Bersanelli, Marco; Brilenkov, Maksym; Colombo, L. P. L.; Eriksen, Hans Kristian Kamfjord; Fornazier, K.S.F.; Franceschet, C.; Fuskeland, Unni; Galloway, Mathew; Gjerløw, Eirik; Hensley, B.; Hergt, L.T.; Herman, Daniel Christopher; Ihle, Håvard Tveit; Lee, Katherine; Lunde, Jonas Gahr Sturtzel; Nerval, S.K.; Paradiso, S.; Patel, S. K.; Rahman, F.; Regnier, M.; San, Metin; Sanyal, S.; Stutzer, Nils-Ole; Thommesen, Harald; Verma, A.; Wehus, Ingunn Kathrine; Zhou, Y. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Cosmic birefringence is a parity-violating effect that might have rotated the plane of the linearly polarized light of the cosmic microwave background (CMB) by an angle β since its emission. This angle has recently been ...
  • COSMOGLOBE: Towards end-to-end CMB cosmological parameter estimation without likelihood approximations 
    Eskilt, Johannes Røsok; Lee, Katherine; Watts, Duncan; Anshul, V.; Aurvik, Ragnhild; Basyrov, Artem; Bersanelli, M.; Colombo, L.P.L.; Eriksen, Hans Kristian Kamfjord; Fornazier, K.S.F.; Fuskeland, Unni; Galloway, Mathew; Gjerløw, Eirik; Hergt, L.T.; Ihle, Håvard Tveit; Lunde, Jonas Gahr Sturtzel; Marins, A.; Nerval, S.K.; Paradiso, S.; Rahman, F.; San, Metin; Stutzer, Nils-Ole; Wehus, Ingunn Kathrine (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    We implement support for a cosmological parameter estimation algorithm in Commander and quantify its computational efficiency and cost. For a semi-realistic simulation similar to Planck LFI 70 GHz, we find that the ...
  • Cross-correlating Carbon Monoxide Line-intensity Maps with Spectroscopic and Photometric Galaxy Surveys 
    Chung, Dongwoo T.; Viero, Marco P.; Church, Sarah E.; Wechsler, Risa H.; Alvarez, Marcelo A.; Bond, John Richard; Breysse, Patrick C.; Cleary, Kieran A.; Eriksen, Hans Kristian Kamfjord; Foss, Marie Kristine; Gundersen, Joshua O.; Harper, Stuart H.; Ihle, Håvard Tveit; Keating, Laura C.; Murray, Norman; Padmanabhan, Hamsa; Stein, George F.; Wehus, Ingunn Kathrine (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Line-intensity mapping is an emerging field of observational work, with strong potential to fit into a larger effort to probe large-scale structure and small-scale astrophysical phenomena using multiple complementary ...
  • From BeyondPlanck to Cosmoglobe: Preliminary WMAP Q-band analysis 
    Watts, Duncan; Galloway, Mathew; Ihle, Håvard Tveit; Andersen, Kristian Joten; Aurvik, Ragnhild; Banerji, Ranajoy; Basyrov, Artem; Bersanelli, M.; Bertocco, S.; Brilenkov, Maksym; Carbone, M.; Colombo, L.P.L.; Eriksen, Hans Kristian Kamfjord; Eskilt, Johannes Røsok; Foss, Marie Kristine; Franceschet, C.; Fuskeland, Unni; Galeotta, S.; Gerakakis, S.; Gjerløw, Eirik; Hensley, B.; Herman, Daniel Christopher; Iacobellis, M.; Ieronymaki, M.; Jewell, J.B.; Karakci, Ata; Keihänen, Elina; Keskitalo, R.; Lunde, Jonas Gahr Sturtzel; Maggio, G.; Maino, D.; Maris, M.; Paradiso, S.; Partridge, B.; Reinecke, M.; San, Metin; Stutzer, Nils-Ole; Suur-Uski, A.-S.; Svalheim, Trygve Leithe; Tavagnacco, D.; Thommesen, Harald; Wehus, Ingunn Kathrine; Zacchei, A. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    We present the first application of the C OSMOGLOBE analysis framework by analyzing nine-year WMAP time-ordered observations that uses similar machinery to that of B EYOND P LANCK for the Planck Low Frequency Instrument ...
  • Joint Power Spectrum and Voxel Intensity Distribution Forecast on the CO Luminosity Function with COMAP 
    Ihle, Håvard Tveit; Chung, D.; Stein, G.; Alvarez, M.; Bond, J. R.; Breysse, P. C.; Cleary, K. A.; Eriksen, Hans Kristian Kamfjord; Foss, Marie Kristine; Gundersen, J. O.; Harper, S.; Murray, N.; Padmanabhan, H.; Viero, M. P.; Wehus, Ingunn Kathrine (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
  • Late Kinetic Decoupling of Dark Matter 
    Ihle, Håvard Tveit (Master thesis / Masteroppgave, 2016)
    If dark matter, after it has become non-relativistic, scatters elastically with a relativistic heat bath particle, then the resulting pressure leads to acoustic oscillations that suppress the growth of overdensities in the ...
  • Testing for foreground residuals in the Planck foreground cleaned maps: A new method for designing confidence masks 
    Axelsson, Magnus; Ihle, Håvard Tveit; Scodeller, Sandro; Hansen, Frode Kristian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    We test for foreground residuals in the foreground-cleaned Planck cosmic microwave background (CMB) maps outside and inside the U73 mask commonly used for cosmological analysis. The aim of this paper is to introduce a new ...
  • The deconvolved distribution estimator: enhancing reionization-era CO line-intensity mapping analyses with a cross-correlation analogue for one-point statistics 
    Chung, Dongwoo T.; Bangari, Ishika; Breysse, Patrick C.; Ihle, Håvard Tveit; Bond, J. Richard; Dunne, Delaney A.; Padmanabhan, Hamsa; Philip, Liju; Rennie, Thomas J.; Viero, Marco P. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    ABSTRACT We present the deconvolved distribution estimator (DDE), an extension of the voxel intensity distribution (VID), in the context of future observations proposed as part of the CO Mapping Array Project (COMAP). The ...