Related papers: The LWA1 Low Frequency Sky Survey

The Global 21 Centimeter Background from High Redshifts

We consider the evolution of the sky-averaged 21 cm background during the early phases of structure formation. Using simple analytic models, we calculate the thermal and ionization histories, assuming that stellar photons dominate the…

Astrophysics · Physics 2009-11-11 Steven Furlanetto

First Spectroscopic Imaging Observations of the Sun at Low Radio Frequencies with the Murchison Widefield Array Prototype

We present the first spectroscopic images of solar radio transients from the prototype for the Murchison Widefield Array (MWA), observed on 2010 March 27. Our observations span the instantaneous frequency band 170.9-201.6 MHz. Though our…

Solar and Stellar Astrophysics · Physics 2015-05-20 Divya Oberoi , Lynn D. Matthews , Iver H. Cairns , David Emrich , Vasili Lobzin , Colin J. Lonsdale , Edward H. Morgan , T. Prabu , Harish Vedantham , Randall B. Wayth , Andrew Williams , Christopher Williams , Stephen M. White , G. Allen , Wayne Arcus , David Barnes , Leonid Benkevitch , Gianni Bernardi , Judd D. Bowman , Frank H. Briggs , John D. Bunton , Steve Burns , Roger C. Cappallo , M. A. Clark , Brian E. Corey , M. Dawson , David DeBoer , A. De Gans , Ludi deSouza , Mark Derome , R. G. Edgar , T. Elton , Robert Goeke , M. R. Gopalakrishna , Lincoln J. Greenhill , Bryna Hazelton , David Herne , Jacqueline N. Hewitt , P. A. Kamini , David L. Kaplan , Justin C. Kasper , Rachel Kennedy , Barton B. Kincaid , Jonathan Kocz , R. Koeing , Errol Kowald , Mervyn J. Lynch , S. Madhavi , Stephen R. McWhirter , Daniel A. Mitchell , Miguel F. Morales , A. Ng , Stephen M. Ord , Joseph Pathikulangara , Alan E. E. Rogers , Anish Roshi , Joseph E. Salah , Robert J. Sault , Antony Schinckel , N. Udaya Shankar , K. S. Srivani , Jamie Stevens , Ravi Subrahmanyan , D. Thakkar , Steven J. Tingay , J. Tuthill , Annino Vaccarella , Mark Waterson , Rachel L. Webster , Alan R. Whitney

Design and Commissioning of the LWA1 Radio Telescope

LWA1 is a new large radio telescope array operating in the frequency range 10-88 MHz, located in central New Mexico. The telescope consists of 260 pairs of dipole-type antennas whose outputs are individually digitized and formed into beams.…

Instrumentation and Methods for Astrophysics · Physics 2016-11-15 S. W. Ellingson , J. Craig , J. Dowell , G. B. Taylor , J. F. Helmboldt

The Circumgalactic Medium of Extreme Emission Line Galaxies at z ~ 2: Resolved Spectroscopy and Radiative Transfer Modeling of Spatially Extended Lyman-alpha Emission in the KBSS-KCWI Survey

The resonantly scattered Lyman-$\alpha$ line illuminates the extended halos of neutral hydrogen in the circumgalactic medium of galaxies. We present integral field Keck Cosmic Web Imager observations of double-peaked, spatially extended…

Astrophysics of Galaxies · Physics 2023-12-25 Dawn K. Erb , Zhihui Li , Charles C. Steidel , Yuguang Chen , Max Gronke , Allison L. Strom , Ryan F. Trainor , Gwen C. Rudie

The EVLA: Prospects for HI

To continue the unparalleled success of the Very Large Array (VLA) for radio astronomy, the facility is currently being converted to become the 'Expanded VLA' (EVLA). The EVLA will radically improve the VLA in order to cover the full…

Astrophysics · Physics 2009-11-13 Juergen Ott , Rick Perley , Michael Rupen , the EVLA team

JADES: Measuring reionization properties using Lyman-alpha emission

Ly$\alpha$ is the transition to the ground state from the first excited state of hydrogen (the most common element). Resonant scattering of this line by neutral hydrogen greatly impedes its emergence from galaxies, so the fraction of…

Astrophysics of Galaxies · Physics 2024-12-02 Gareth C. Jones , Andrew J. Bunker , Aayush Saxena , Santiago Arribas , Rachana Bhatawdekar , Kristan Boyett , Alex. J. Cameron , Stefano Carniani , Stephane Charlot , Emma Curtis-Lake , Kevin Hainline , Benjamin D. Johnson , Nimisha Kumari , Michael V. Maseda , Hans-Walter Rix , Brant E. Robertson , Sandro Tacchella , Hannah Übler , Christina C. Williams , Chris Willott , Joris Witstok , Yongda Zhu

A multi-resolution, multi-epoch low radio frequency survey of the Kepler K2 mission Campaign 1 field

We present the first dedicated radio continuum survey of a Kepler K2 mission field, Field 1 covering the North Galactic Cap. The survey is wide field, contemporaneous, multi-epoch, and multi-resolution in nature and was conducted at low…

Astrophysics of Galaxies · Physics 2016-09-21 S. J. Tingay , P. J. Hancock , R. B. Wayth , H. Intema , P. Jagannathan , K. Mooley

A 1.4 GHz Survey of the Southern ELAIS Region

A deep survey of the European Large Area ISO Survey (ELAIS) field in the southern celestial hemisphere (hereinafter S1) has been carried out with the Australia Telescope Compact Array (ATCA) at 1.4 GHz. The S1 region, covering about 4…

Astrophysics · Physics 2007-05-23 C. Gruppioni , P. Ciliegi , M. Rowan-Robinson , L. Cram , A. Hopkins , C. Cesarsky , L. Danese , A. Franceschini , R. Genzel , A. Lawrence , D. Lemke , R. G. McMahon , G. Miley , S. Oliver , J-L. Puget , B. Rocca-Volmerange

Radio Emission from the Milky Way

In the last 5-10 years, wide-field imaging capabilities and effective mosaicing algorithms have made possible a variety of ambitious interferometric surveys of the Galaxy, resulting in images of unprecedented sensitivity and resolution.…

Astrophysics · Physics 2007-05-23 Bryan Gaensler

Direct Optimal Mapping for 21cm Cosmology: A Demonstration with the Hydrogen Epoch of Reionization Array

Motivated by the desire for wide-field images with well-defined statistical properties for 21cm cosmology, we implement an optimal mapping pipeline that computes a maximum likelihood estimator for the sky using the interferometric…

Cosmology and Nongalactic Astrophysics · Physics 2022-10-28 Zhilei Xu , Jacqueline N. Hewitt , Kai-Feng Chen , Honggeun Kim , Joshua S. Dillon , Nicholas S. Kern , Miguel F. Morales , Bryna J. Hazelton , Ruby Byrne , Nicolas Fagnoni , Eloy de Lera Acedo , Zara Abdurashidova , Tyrone Adams , James E. Aguirre , Paul Alexander , Zaki S. Ali , Rushelle Baartman , Yanga Balfour , Adam P. Beardsley , Gianni Bernardi , Tashalee S. Billings , Judd D. Bowman , Richard F. Bradley , Philip Bull , Jacob Burba , Steven Carey , Chris L. Carilli , Carina Cheng , David R. DeBoer , Matt Dexter , Nico Eksteen , John Ely , Aaron Ewall-Wice , Randall Fritz , Steven R. Furlanetto , Kingsley Gale-Sides , Brian Glendenning , Deepthi Gorthi , Bradley Greig , Jasper Grobbelaar , Ziyaad Halday , Jack Hickish , Daniel C. Jacobs , Austin Julius , MacCalvin Kariseb , Joshua Kerrigan , Piyanat Kittiwisit , Saul A. Kohn , Matthew Kolopanis , Adam Lanman , Paul La Plante , Adrian Liu , Anita Loots , Yin-zhe Ma , David Harold Edward MacMahon , Lourence Malan , Cresshim Malgas , Keith Malgas , Bradley Marero , Zachary E. Martinot , Andrei Mesinger , Mathakane Molewa , Tshegofalang Mosiane , Steven G. Murray , Abraham R. Neben , Bojan Nikolic , Hans Nuwegeld , Aaron R. Parsons , Nipanjana Patra , Samantha Pieterse , Jonathan C. Pober , Nima Razavi-Ghods , James Robnett , Kathryn Rosie , Peter Sims , Craig Smith , Hilton Swarts , Nithyanandan Thyagarajan , Pieter Van Van Wyngaarden , Peter K. G. Williams , Haoxuan Zheng

High Latitude Radio Emission in a Sample of Edge-On Spiral Galaxies

We have mapped 16 edge-on galaxies at 20 cm using the VLA. For 5 galaxies, we could form spectral index, energy and magnetic field maps. We find that all but one galaxy show evidence for non-thermal high latitude radio continuum emission,…

Astrophysics · Physics 2009-10-31 Judith A. Irwin , Jayanne English , Barkat Sorathia

The Billion Galaxy Cosmological HI Large Deep Survey

We outline the case for a comprehensive wide and deep survey ultimately targeted at obtaining 21-cm HI line emission spectroscopic observations of more than a billion galaxies to redshift z=1.5 and greater over half the sky. This survey…

Cosmology and Nongalactic Astrophysics · Physics 2009-03-05 Steven T. Myers , Filipe B. Abdalla , Chris Blake , Leon Koopmans , Joseph Lazio , Steve Rawlings

Concept of an Experimental Ultra Long-wavelength Radio Array

The Ultra-Long Wavelength (ULW) regime of longer than 10 m (corresponding to frequencies below 30 MHz), remains as the last virtually unexplored window in radio astronomy, and is presently attracting considerable attention as an area of…

Instrumentation and Methods for Astrophysics · Physics 2019-09-04 Linjie Chen , Yihua Yan

Nearly all the sky is covered by Lyman-alpha emission around high redshift galaxies

Galaxies are surrounded by large reservoirs of gas, mostly hydrogen, fed by inflows from the intergalactic medium and by outflows due to galactic winds. Absorption-line measurements along the sightlines to bright and rare background quasars…

Astrophysics of Galaxies · Physics 2018-10-03 L. Wisotzki , R. Bacon , J. Brinchmann , S. Cantalupo , P. Richter , J. Schaye , K. B. Schmidt , T. Urrutia , P. M. Weilbacher , M. Akhlaghi , N. Bouche , T. Contini , B. Guiderdoni , E. C. Herenz , H. Inami , J. Kerutt , F. Leclercq , R. A. Marino , M. Maseda , A. Monreal-Ibero , T. Nanayakkara , J. Richard , R. Saust , M. Steinmetz , M. Wendt

Measurement of Very-high-energy Diffuse Gamma-ray Emissions from the Galactic Plane with LHAASO-WCDA

The diffuse Galactic gamma-ray emission is a very important tool used to study the propagation and interaction of cosmic rays in the Milky Way. In this work, we report the measurements of the diffuse emission from the Galactic plane,…

High Energy Astrophysical Phenomena · Physics 2026-01-08 The LHAASO Collaboration , Zhen Cao , F. Aharonian , Y. X. Bai , Y. W. Bao , D. Bastieri , X. J. Bi , Y. J. Bi , W. Bian , A. V. Bukevich , C. M. Cai , W. Y. Cao , Zhe Cao , J. Chang , J. F. Chang , A. M. Chen , E. S. Chen , H. X. Chen , Liang Chen , Long Chen , M. J. Chen , M. L. Chen , Q. H. Chen , S. Chen , S. H. Chen , S. Z. Chen , T. L. Chen , X. B. Chen , X. J. Chen , Y. Chen , N. Cheng , Y. D. Cheng , M. C. Chu , M. Y. Cui , S. W. Cui , X. H. Cui , Y. D. Cui , B. Z. Dai , H. L. Dai , Z. G. Dai , Danzengluobu , Y. X. Diao , X. Q. Dong , K. K. Duan , J. H. Fan , Y. Z. Fan , J. Fang , J. H. Fang , K. Fang , C. F. Feng , H. Feng , L. Feng , S. H. Feng , X. T. Feng , Y. Feng , Y. L. Feng , S. Gabici , B. Gao , C. D. Gao , Q. Gao , W. Gao , W. K. Gao , M. M. Ge , T. T. Ge , L. S. Geng , G. Giacinti , G. H. Gong , Q. B. Gou , M. H. Gu , F. L. Guo , J. Guo , X. L. Guo , Y. Q. Guo , Y. Y. Guo , Y. A. Han , O. A. Hannuksela , M. Hasan , H. H. He , H. N. He , J. Y. He , X. Y. He , Y. He , S. Hernández-Cadena , Y. K. Hor , B. W. Hou , C. Hou , X. Hou , H. B. Hu , S. C. Hu , C. Huang , D. H. Huang , J. J. Huang , T. Q. Huang , W. J. Huang , X. T. Huang , X. Y. Huang , Y. Huang , Y. Y. Huang , X. L. Ji , H. Y. Jia , K. Jia , H. B. Jiang , K. Jiang , X. W. Jiang , Z. J. Jiang , M. Jin , S. Kaci , M. M. Kang , I. Karpikov , D. Khangulyan , D. Kuleshov , K. Kurinov , B. B. Li , Cheng Li , Cong Li , D. Li , F. Li , H. B. Li , H. C. Li , Jian Li , Jie Li , K. Li , L. Li , R. L. Li , S. D. Li , T. Y. Li , W. L. Li , X. R. Li , Xin Li , Y. Z. Li , Zhe Li , Zhuo Li , E. W. Liang , Y. F. Liang , S. J. Lin , B. Liu , C. Liu , D. Liu , D. B. Liu , H. Liu , H. D. Liu , J. Liu , J. L. Liu , J. R. Liu , M. Y. Liu , R. Y. Liu , S. M. Liu , W. Liu , X. Liu , Y. Liu , Y. Liu , Y. N. Liu , Y. Q. Lou , Q. Luo , Y. Luo , H. K. Lv , B. Q. Ma , L. L. Ma , X. H. Ma , J. R. Mao , Z. Min , W. Mitthumsiri , G. B. Mou , H. J. Mu , Y. C. Nan , A. Neronov , K. C. Y. Ng , M. Y. Ni , L. Nie , L. J. Ou , P. Pattarakijwanich , Z. Y. Pei , J. C. Qi , M. Y. Qi , J. J. Qin , A. Raza , C. Y. Ren , D. Ruffolo , A. Sáiz , M. Saeed , D. Semikoz , L. Shao , O. Shchegolev , Y. Z. Shen , X. D. Sheng , Z. D. Shi , F. W. Shu , H. C. Song , Yu. V. Stenkin , V. Stepanov , Y. Su , D. X. Sun , H. Sun , Q. N. Sun , X. N. Sun , Z. B. Sun , N. H. Tabasam , J. Takata , P. H. T. Tam , H. B. Tan , Q. W. Tang , R. Tang , Z. B. Tang , W. W. Tian , C. N. Tong , L. H. Wan , C. Wang , G. W. Wang , H. G. Wang , H. H. Wang , J. C. Wang , K. Wang , Kai Wang , Kai Wang , L. P. Wang , L. Y. Wang , L. Y. Wang , R. Wang , W. Wang , X. G. Wang , X. J. Wang , X. Y. Wang , Y. Wang , Y. D. Wang , Z. H. Wang , Z. X. Wang , Zheng Wang , D. M. Wei , J. J. Wei , Y. J. Wei , T. Wen , S. S. Weng , C. Y. Wu , H. R. Wu , Q. W. Wu , S. Wu , X. F. Wu , Y. S. Wu , S. Q. Xi , J. Xia , J. J. Xia , G. M. Xiang , D. X. Xiao , G. Xiao , Y. L. Xin , Y. Xing , D. R. Xiong , Z. Xiong , D. L. Xu , R. F. Xu , R. X. Xu , W. L. Xu , L. Xue , D. H. Yan , J. Z. Yan , T. Yan , C. W. Yang , C. Y. Yang , F. F. Yang , L. L. Yang , M. J. Yang , R. Z. Yang , W. X. Yang , Y. H. Yao , Z. G. Yao , X. A. Ye , L. Q. Yin , N. Yin , X. H. You , Z. Y. You , Y. H. Yu , Q. Yuan , H. Yue , H. D. Zeng , T. X. Zeng , W. Zeng , M. Zha , B. B. Zhang , B. T. Zhang , F. Zhang , H. Zhang , H. M. Zhang , H. Y. Zhang , J. L. Zhang , Li Zhang , P. F. Zhang , P. P. Zhang , R. Zhang , S. R. Zhang , S. S. Zhang , W. Y. Zhang , X. Zhang , X. P. Zhang , Yi Zhang , Yong Zhang , Z. P. Zhang , J. Zhao , L. Zhao , L. Z. Zhao , S. P. Zhao , X. H. Zhao , Z. H. Zhao , F. Zheng , W. J. Zhong , B. Zhou , H. Zhou , J. N. Zhou , M. Zhou , P. Zhou , R. Zhou , X. X. Zhou , X. X. Zhou , B. Y. Zhu , C. G. Zhu , F. R. Zhu , H. Zhu , K. J. Zhu , Y. C. Zou , X. Zuo

Power spectrum analysis of ionospheric fluctuations with the Murchison Widefield Array

Low-frequency, wide field-of-view (FoV) radio telescopes such as the Murchison Widefield Array (MWA) enable the ionosphere to be sampled at high spatial completeness. We present the results of the first power spectrum analysis of…

Instrumentation and Methods for Astrophysics · Physics 2015-09-02 Shyeh Tjing Loi , Cathryn M. Trott , Tara Murphy , Iver H. Cairns , Martin Bell , Natasha Hurley-Walker , John Morgan , Emil Lenc , A. R. Offringa , L. Feng , P. J. Hancock , D. L. Kaplan , N. Kudryavtseva , G. Bernardi , J. D. Bowman , F. Briggs , R. J. Cappallo , B. E. Corey , A. A. Deshpande , D. Emrich , B. M. Gaensler , R. Goeke , L. J. Greenhill , B. J. Hazelton , M. Johnston-Hollitt , J. C. Kasper , E. Kratzenberg , C. J. Lonsdale , M. J. Lynch , S. R. McWhirter , D. A. Mitchell , M. F. Morales , E. Morgan , D. Oberoi , S. M. Ord , T. Prabu , A. E. E. Rogers , A. Roshi , N. Udaya Shankar , K. S. Srivani , R. Subrahmanyan , S. J. Tingay , M. Waterson , R. B. Wayth , R. L. Webster , A. R. Whitney , A. Williams , C. L. Williams

Full Sky Study of Diffuse Galactic Emission at Decimeter Wavelengths

A detailed knowledge of the Galactic radio continuum is of high interest for studies of the dynamics and structure of the Galaxy as well as for the problem of foreground removal in Cosmic Microwave Background measurements. In this work we…

Astrophysics · Physics 2011-05-23 P. Platania , C. Burigana , D. Maino , E. Caserini , M. Bersanelli , B. Cappellini , A. Mennella

Imaging neutral hydrogen on large-scales during the Epoch of Reionization with LOFAR

The first generation of redshifted 21 cm detection experiments, carried out with arrays like LOFAR, MWA and GMRT, will have a very low signal-to-noise ratio per resolution element (\sim 0.2). In addition, whereas the variance of the…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-05 S. Zaroubi , A. G. de Bruyn , G. Harker , R. M. Thomas , P. Labropolous , V. Jelic , L. V. E. Koopmans , M. A. Brentjens , G. Bernardi , B. Ciardi , S. Daiboo , S. Kazemi , O. Martinez-Rubi , G. Mellema , A. R. Offringa , V. N. Pandey , J. Schaye , V. Veligatla , H. Vedantham , S. Yatawatta

The Wisconsin H-Alpha Mapper Northern Sky Survey of Galactic Ionized Hydrogen

The Wisconsin H-Alpha Mapper (WHAM) has completed a one-degree resolution, velocity-resolved northern sky survey of H-alpha emission from our Galaxy. The unprecedented sensitivity of the instrument and accurate spectral subtraction of…

Astrophysics · Physics 2007-05-23 G. J. Madsen , L. M. Haffner , R. J. Reynolds

LOFAR 58 MHz Legacy Survey of the 3CRR Catalog

The Low Frequency Array (LOFAR) is uniquely able to perform deep, 15" resolutions imaging at frequencies below 100 MHz. Observations in this regime, using the Low Band Antenna (LBA) system, are significantly affected by instrumental and…

Astrophysics of Galaxies · Physics 2026-01-14 J. M. Boxelaar , F. De Gasperin , M. J. Hardcastle , J. H. Croston , L. K. Morabito , R. J. van Weeren , H. Edler