H i intensity mapping with MeerKAT: primary beam effects on foreground cleaning
Reads0
Chats0
TLDR
In this paper, the authors show that the coupling between beam sidelobes and the foreground structure can complicate the cleaning of the MeerKAT beam and show that this effect is constrained to a narrow region in parallel space and can be reduced if the maps are carefully re-smoothed to a common lower resolution.Abstract:
Upcoming and future neutral hydrogen Intensity Mapping surveys offer a great opportunity to constrain cosmology in the post-reionization Universe, provided a good accuracy is achieved in the separation between the strong foregrounds and the cosmological signal. Cleaning methods rely on the frequency smoothness of the foregrounds and are often applied under the assumption of a simplistic Gaussian primary beam. In this work, we test the cleaning in the presence of a realistic primary beam model with a non trivial frequency dependence. We focus on the Square Kilometre Array precursor MeerKAT telescope and simulate a single-dish wide area survey. We consider the main foreground components, including an accurate full sky point source catalogue. We find that the coupling between beam sidelobes and the foreground structure can complicate the cleaning. However, when the beam frequency dependence is smooth, we show that the cleaning is only problematic if the far sidelobes are unexpectedly large. Even in that case, a proper reconstruction is possible if the strongest point sources are removed and the cleaning is more aggressive. We then consider a non-trivial frequency dependence: a sinusoidal type feature in the beam width that is present in the MeerKAT beam and is expected in most dishes, including SKA1-MID. Such a feature, coupling with the foreground emission, biases the reconstruction of the signal across frequency, potentially impacting the cosmological analysis. Interestingly, such contamination is present at a lower level even when no point sources are included and the beam is Gaussian, showing that this frequency ripple can be problematic even within the main lobe. We show that this effect is constrained to a narrow region in $k_\parallel$ space and can be reduced if the maps are carefully re-smoothed to a common lower resolution.read more
Citations
More filters
Journal ArticleDOI
Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
Elcio Abdalla,G. F. Abell'an,Amin Aboubrahim,Adriano Agnello,Ozgur Akarsu,Yashar Akrami,George Alestas,Daniel Aloni,Luca Amendola,Luis A. Anchordoqui,Richard I. Anderson,Nikki Arendse,Marika Asgari,Mario Ballardini,Vernon Barger,Spyros Basilakos,R. C. Batista,Elia S. Battistelli,Richard A. Battye,Micol Benetti,David Benisty,Asher Berlin,P. de Bernardis,Emanuele Berti,Bohdan Bidenko,Simon Birrer,John P. Blakeslee,Kimberly K. Boddy,Clecio R. Bom,Alexander Bonilla,Nicolas Borghi,F. R. Bouchet,Matteo Braglia,Thomas Buchert,E. Buckley-Geer,Erminia Calabrese,Robert R. Caldwell,David Camarena,Salvatore Capozziello,Stefano Casertano,Geoff C. F. Chen,Jens Chluba,Angela Chen,Hsin-Yu Chen,Anton Chudaykin,Michele Cicoli,Craig J. Copi,Frederic Courbin,Francis-Yan Cyr-Racine,Bozena Czerny,Maria Giovanna Dainotti,Guido D'Amico,Anne-Christine Davis,Javier P'erez,Jaume Haro,Jacques Delabrouille,Peter B. Denton,Suhail Dhawan,Keith R. Dienes,E. Di Valentino,Pu Du,Dominique Eckert,Celia Escamilla-Rivera,A. Fert'e,Fabio Finelli,Pablo Fosalba,Wendy L. Freedman,Noemi Frusciante,Enrique Gaztanaga,William Giarè,Elena Giusarma,Adria G'omez-Valent,Will Handley,Ian Harrison,Luke Hart,Dhiraj Kumar Hazra,Alan Heavens,Asta Heinesen,Hendrik Hildebrandt,Jessica C Hill,Natalie B. Hogg,Daniel E. Holz,Deanna C. Hooper,Nikoo Hosseininejad,Dragan Huterer,Mustapha Ishak,Mikhail M. Ivanov,Andrew H. Jaffe,In Sung Jang,Karsten Jedamzik,Raul Jimenez,Melissa Joseph,Shahab Joudaki,Marc Kamionkowski,Tanvi Karwal,Lavrentios Kazantzidis,Ryan E. Keeley,Michael Klasen,Eiichiro Komatsu,Léon V. E. Koopmans,Suresh Kumar,Luca Lamagna,Ruth Lazkoz,Chung-Chi Lee,Julien Lesgourgues,Jackson Levi Said,Tiffany R. Lewis,Benjamin L'Huiller,Matteo Lucca,Roy Maartens,Lucas M. Macri,Danny Marfatia,Valerio Marra,Carlos Martins,Silvia Masi,Sabino Matarrese,Arindam Mazumdar,Alessandro Melchiorri,Olga Mena,Laura Mersini-Houghton,James B. Mertens,Dinko Milaković,Yuto Minami,V. Miranda,Cristian Moreno-Pulido,Michele Ennio Maria Moresco,David F. Mota,Emil Mottola,Simone Mozzon,J. Muir,Ankan Mukherjee,Suvodip Mukherjee,Pavel Naselsky,Pran Nath,Savvas Nesseris,Florian Niedermann,Alessio Notari,Rafael C. Nunes,Eoin 'O Colg'ain,Kayla A. Owens,Emre Ozulker,Francesco Paresce,Andronikos Paliathanasis,Antonella Palmese,Supriya Pan,Daniela Paoletti,S. E. Perez Bergliaffa,Leadros Perivolaropoulos,Dominic W. Pesce,Valeria Pettorino,Oliver H. E. Philcox,Levon Pogosian,Vivian Poulin,Gaspard Poulot,Marco Roveri,Mark J. Reid,F. Renzi,Adam G. Riess,V. I. Sabla,Paolo Salucci,Vincenzo Salzano,Emmanuel N. Saridakis,Bangalore Suryanarayana Sathyaprakash,Martin Schmaltz,N. Schoneberg,Daniel Scolnic,Anjan A. Sen,Neelima Sehgal,Arman Shafieloo,Mohammmad Mahdi Sheikh-Jabbari,Joseph Silk,Alessandra Silvestri,Foteini Skara,Martin S. Sloth,Marcelle Soares-Santos,Joan Solà Peracaula,Yu-Yang Songsheng,Jorge F. Soriano,Denitsa Staicova,Glenn D. Starkman,István Szapudi,E. Teixera,Brooks Thomas,Tommaso Treu,E. Trott,Carsten van de Bruck,Jose Alberto Vazquez,Licia Verde,Luca Visinelli,Deng Wang,Jian-Min Wang,Shao-Jiang Wang,Richard Watkins,Scott Watson,John K. Webb,Neal Weiner,Amanda Weltman,Samuel J. Witte,Radosław Wojtak,Anil Kumar Yadav,Weiqiang Yang,Gong-Bo Zhao,Miguel Zumalac'arregui +202 more
TL;DR: In this paper , the authors focus on the 5.0σ tension between the Planck CMB estimate of the Hubble constant H0 and the SH0ES collaboration measurements and discuss the importance of trying to fit a full array of data with a single model.
Posted Content
Baryon Acoustic Oscillation Intensity Mapping of Dark Energy
TL;DR: Here it is shown how the study of acoustic oscillation in the 21 cm brightness can be accomplished by economical three-dimensional intensity mapping, and may be the starting point for a new class of dark energy experiments dedicated to large angular scale mapping of the radio sky, shedding light on dark energy.
Journal ArticleDOI
H I intensity mapping with MeerKAT: calibration pipeline for multidish autocorrelation observations
Jingying Wang,Mario G. Santos,Philip Bull,Philip Bull,Keith Grainge,Steven Cunnington,José Fonseca,Melis O. Irfan,Melis O. Irfan,Yichao Li,Alkistis Pourtsidou,Alkistis Pourtsidou,Paula S. Soares,M. Spinelli,Gianni Bernardi,Gianni Bernardi,Brandon Engelbrecht +16 more
TL;DR: In this article, the authors calibrate dual-polarization autocorrelation data from 64 MeerKAT dishes in the L-band (856-1712 MHz, 4096 channels) with 10.5 hours of data retained from six nights of observing.
Journal ArticleDOI
Unveiling the Universe with emerging cosmological probes
Michele Ennio Maria Moresco,Lorenzo Amati,Luca Amendola,Simon Birrer,John P. Blakeslee,Michele Cantiello,Andrea Cimatti,Jeremy Darling,M. Della Valle,Maya Fishbach,Claudio Grillo,Nico Hamaus,Daniel E. Holz,Luca Izzo,Raul Jimenez,Elisabeta Lusso,Massimo Meneghetti,Ester Piedipalumbo,Alice Pisani,Alkistis Pourtsidou,Lucia Pozzetti,Miguel Quartin,Guido Risaliti,Piero Rosati,Licia Verde +24 more
TL;DR: A review of the latest advances in emerging "beyond-standard" cosmological probes can be found in this paper , where several different methods can become a key resource for observational cosmology, and the potential synergies and complementarities between the various probes, exploring how they will contribute to the future of modern cosmology.
References
More filters
Journal ArticleDOI
The tianlai project: a 21cm cosmology experiment
TL;DR: The Tianlai project as mentioned in this paper, an experiment effort on low redshift 21cm intensity mapping observation for dark energy measurements, was presented at the 2nd Galileo-Xu Meeting.
Journal ArticleDOI
An improved method for 21‐cm foreground removal
TL;DR: In this paper, a Fourier space formalism was introduced for describing the line-of-sight methods, and an improved new method for 21-cm foreground cleaning was introduced, which involves fitting foregrounds in Fourier spaces using weighted polynomial fits with each pixel weighted according to its information content.
Journal ArticleDOI
Fast convolution on the sphere
TL;DR: In this paper, the authors proposed fast exact and efficient algorithms for the convolution of two arbitrary functions on the sphere which speed up computations by a factor of O(n) compared to present methods where N is the number of pixels.
Journal ArticleDOI
Neutral hydrogen surveys for high-redshift galaxy clusters and protoclusters
TL;DR: In this article, the authors discuss the possibility of performing blind surveys to detect large-scale features of the Universe using 21-cm emission, and compute the number of virialized objects and those at turnaround which might be detected by such surveys.
Journal ArticleDOI
Baryonic Acoustic Oscillations in 21cm Emission: A Probe of Dark Energy out to High Redshifts
TL;DR: The first generation of low-frequency experiments (such as MWA or LOFAR) can constrain the acoustic scale to within a few percent in a redshift window just prior to the end of the reionization era, provided that foregrounds can be removed over frequency bandpasses of >8MHz as mentioned in this paper.
Related Papers (5)
MeerKLASS: MeerKAT Large Area Synoptic Survey
Mario G. Santos,Michelle E. Cluver,Matt Hilton,Matt J. Jarvis,Gyula I. G. Józsa,Lerothodi Leonard Leeuw,Oleg Smirnov,Russ Taylor,Filipe B. Abdalla,Jose Afonso,David Alonso,David Bacon,Bruce A. Bassett,Gianni Bernardi,Philip Bull,Stefano Camera,H. Cynthia Chiang,S. Colafrancesco,Pedro G. Ferreira,José Fonseca,Kurt van der Heyden,Ian Heywood,Kenda Knowles,Michelle Lochner,Yin-Zhe Ma,Roy Maartens,S. Makhathini,Kavilan Moodley,Alkistis Pourtsidou,Matthew Prescott,Jonathan Sievers,Kristine Spekkens,Mattia Vaccari,Amanda Weltman,I. H. Whittam,Amadeus Witzemann,Laura Wolz,Jonathan T. L. Zwart +37 more
Low-amplitude clustering in low-redshift 21-cm intensity maps cross-correlated with 2dF galaxy densities
C. J. Anderson,C. J. Anderson,N. J. Luciw,Yi-Chao Li,Yi-Chao Li,C. Y. Kuo,C. Y. Kuo,Jaswant K. Yadav,Jaswant K. Yadav,Kiyoshi Masui,Tzu-Ching Chang,Tzu-Ching Chang,Xian Chen,Xian Chen,Niels Oppermann,Yu-Wei Liao,Ue-Li Pen,Danny C. Price,Lister Staveley-Smith,Eric R. Switzer,Peter T. Timbie,Laura Wolz +21 more