Zobrazeno 1 - 10
of 86
pro vyhledávání: '"L J Greenhill"'
Cosmic Dawn, the onset of star formation in the early universe, can in principle be studied via the 21cm transition of neutral hydrogen, for which a sky-averaged absorption signal, redshifted to MHz frequencies, is predicted to be {\it O}(10-100)\,mK
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::980eb4e3e1731940f17e7011c785d920
http://hdl.handle.net/20.500.12386/32548
http://hdl.handle.net/20.500.12386/32548
Total-power radiometry with individual meter-wave antennas is a potentially effective way to study the Cosmic Dawn ($z\sim20$) through measurement of sky brightness arising from the $21$~cm transition of neutral hydrogen, provided this can be disenta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::abad15c3414f56269f9f3ad548e6e70b
Autor:
L J Greenhill, R Subrahmanyan
Publikováno v:
The Cosmic 21-cm Revolution: Charting the first billion years of our Universe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f716123a8a75ed36903c830451591edc
https://doi.org/10.1088/2514-3433/ab4a73ch7
https://doi.org/10.1088/2514-3433/ab4a73ch7
Autor:
Albert-Jan Boonstra, Kaushal D. Buch, Jonathon Kocz, Urvashi Rau, L. J. Greenhill, Gregory Hellbourg
Publikováno v:
Journal of Astronomical Instrumentation.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f8f4a4d04f4f3ccdcba9f4bf7dfb5d80
https://doi.org/10.1142/s2251171719920016
https://doi.org/10.1142/s2251171719920016
A high reliability survey of discrete Epoch of Reionization foreground sources in the MWA EoR0 field
Autor:
Chen Wu, J. Riding, Frank H. Briggs, A. Roshi, Rachel L. Webster, S. K. Sethi, J. L. B. Line, S. M. Ord, Jonathan C. Pober, Adam P. Beardsley, N. Udaya Shankar, K. S. Srivani, Eric Kratzenberg, Andrew Williams, Pietro Procopio, Robert F. Goeke, Colin J. Lonsdale, M. Waterson, Gianni Bernardi, Roger J. Cappallo, Ian Sullivan, Bryna J. Hazelton, Bryan Gaensler, J. S. Dillon, Abraham Loeb, A. de Oliveira-Costa, Eric R. Morgan, Nichole Barry, T. Prabu, Steven Tingay, Alan E. E. Rogers, David Emrich, Benjamin McKinley, Brian E. Corey, Bartosz Pindor, Christopher L. Williams, Daniel A. Mitchell, D. L. Kaplan, P. Carroll, Alan R. Whitney, D. C. Jacobs, Judd D. Bowman, Lu Feng, A. R. Offringa, Jacqueline N. Hewitt, J. S. B. Wyithe, Abraham R. Neben, L. J. Greenhill, D. Oberoi, Hs. Kim, Stephen R. McWhirter, J. C. Kasper, Cathryn M. Trott, Miguel F. Morales, Aaron Ewall-Wice, Natasha Hurley-Walker, Emil Lenc, M. J. Lynch, Randall B. Wayth, Max Tegmark, S. Paul, Melanie Johnston-Hollitt, Ravi Subrahmanyan, Nithyanandan Thyagarajan
Publikováno v:
ResearcherID
arXiv
arXiv
Detection of the epoch of reionization H i signal requires a precise understanding of the intervening galaxies and AGN, both for instrumental calibration and foreground removal. We present a catalogue of 7394 extragalactic sources at 182 MHz detected
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c3fbdf85cd658744e0b2f8a0e7569b56
https://doi.org/10.1093/mnras/stw1599
https://doi.org/10.1093/mnras/stw1599
Autor:
Lynn D. Matthews, Malcolm Gray, Claire J. Chandler, Ciriaco Goddi, L. J. Greenhill, Heino Falcke, Elizabeth Humphreys, Sara Issaoun, Mark R. Krumholz
Publikováno v:
Astronomy & Astrophysics, 606, 1-11
Astronomy & Astrophysics (0004-6361), 606, A126
Gray, M 2017, ' VLBA imaging of the 3 mm SiO maser emission in the disk-wind from the massive protostellar system Orion Source I ', Astronomy and Astrophysics, vol. 606, pp. 126-136 . https://doi.org/10.1051/0004-6361/201731548
Astronomy & Astrophysics, 606, pp. 1-11
Astronomy & Astrophysics (0004-6361), 606, A126
Gray, M 2017, ' VLBA imaging of the 3 mm SiO maser emission in the disk-wind from the massive protostellar system Orion Source I ', Astronomy and Astrophysics, vol. 606, pp. 126-136 . https://doi.org/10.1051/0004-6361/201731548
Astronomy & Astrophysics, 606, pp. 1-11
We present the first images of the 28SiO v=1, J=2-1 maser emission around the closest known massive young stellar object Orion Source I observed at 86 GHz (3mm) with the VLBA. These images have high spatial (~0.3 mas) and spectral (~0.054 km/s) resol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cbdafc8bf397e66e4d25436537d3677b
https://hdl.handle.net/1887/59371
https://hdl.handle.net/1887/59371
Autor:
C. J. Lonsdale, Steven Tingay, Piyanat Kittiwisit, Rachel L. Webster, L. J. Greenhill, K. S. Srivani, David L. Kaplan, Nithyanandan Thyagarajan, Bryna J. Hazelton, Lu Feng, R. B. Wayth, Bryan Gaensler, Judd D. Bowman, Stephen R. McWhirter, Aaron Ewall-Wice, Natasha Hurley-Walker, B. McKinley, Emil Lenc, Pietro Procopio, J. S. B. Wyithe, A. de Oliveira-Costa, Shiv K. Sethi, Donald J. Jacobs, J. L. B. Line, K. S. Dwarkanath, Jacqueline N. Hewitt, Jonathan C. Pober, N. Udaya Shankar, Nichole Barry, Stephen M. Ord, Han-Seek Kim, Abraham R. Neben, C. L. Williams, Roger J. Cappallo, Thiagaraj Prabu, J. Riding, A. P. Beardsley, Andrew R. Williams, B. Pindor, P. Carroll, F. Briggs, Daniel A. Mitchell, Avi Loeb, Cathryn M. Trott, Miguel F. Morales, A. R. Offringa, Ian Sullivan, Eric R. Morgan, Joshua S. Dillon, Max Tegmark, Melanie Johnston-Hollitt, S. Paul, Ravi Subrahmanyan, Divya Oberoi
The Detection of redshifted 21 cm emission from the epoch of reionization (EoR) is a challenging task owing to strong foregrounds that dominate the signal. In this paper, we propose a general method, based on the delay spectrum approach, to extract H
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bf9ca48561db2f22d93380337e9d5739
Autor:
A. Herzog, R. P. Norris, E. Middelberg, N. Seymour, L. R. Spitler, B. H. C. Emonts, T. M. O. Franzen, R. Hunstead, H. T. Intema, J. Marvil, Q. A. Parker, S. K. Sirothia, N. Hurley-Walker, M. Bell, G. Bernardi, J. D. Bowman, F. Briggs, R. J. Cappallo, J. R. Callingham, A. A. Deshpande, K. S. Dwarakanath, B.-Q. For, L. J. Greenhill, P. Hancock, B. J. Hazelton, L. Hindson, M. Johnston-Hollitt, A. D. Kapińska, D. L. Kaplan, E. Lenc, C. J. Lonsdale, B. McKinley, S. R. McWhirter, D. A. Mitchell, M. F. Morales, E. Morgan, J. Morgan, D. Oberoi, A. Offringa, S. M. Ord, T. Prabu, P. Procopio, N. Udaya Shankar, K. S. Srivani, L. Staveley-Smith, R. Subrahmanyan, S. J. Tingay, R. B. Wayth, R. L. Webster, A. Williams, C. L. Williams, C. Wu, Q. Zheng, K. W. Bannister, A. P. Chippendale, L. Harvey-Smith, I. Heywood, B. Indermuehle, A. Popping, R. J. Sault, M. T. Whiting
Publikováno v:
Astronomy and astrophysics, 593. EDP Sciences
Infrared-faint radio sources (IFRS) are a class of radio-loud (RL) active galactic nuclei (AGN) at high redshifts (z > 1.7) that are characterised by their relative infrared faintness, resulting in enormous radio-to-infrared flux density ratios of up
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cb42be15fd5c7a3c64198f6c0dafde49
Autor:
J. Riding, Chen Wu, Bryna J. Hazelton, Judd D. Bowman, Ian Sullivan, Eric R. Morgan, Joshua S. Dillon, L. J. Greenhill, Natasha Hurley-Walker, David L. Kaplan, Emil Lenc, A. de Oliveira-Costa, A. P. Beardsley, Steven Tingay, Divya Oberoi, Randall B. Wayth, Rachel L. Webster, J. S. B. Wyithe, C. J. Lonsdale, P. Carroll, Shiv K. Sethi, A. R. Offringa, K. S. Srivani, Daniel A. Mitchell, Max Tegmark, Jacqueline N. Hewitt, Pietro Procopio, Thiagaraj Prabu, Abraham R. Neben, Chrysanthi Williams, Aaron Ewall-Wice, Daniel C. Jacobs, J. L. B. Line, Melanie Johnston-Hollitt, B. Pindor, Stephen M. Ord, Nithyanandan Thyagarajan, F. Briggs, Lu Feng, N. Udaya Shankar, Benjamin McKinley, Andrew R. Williams, Gianni Bernardi, Avi Loeb, Nichole Barry, Ravi Subrahmanyan, S. Paul, Roger J. Cappallo, Cathryn M. Trott, Miguel F. Morales, Jonathan C. Pober, Han-Seek Kim
Publikováno v:
ResearcherID
Detection of the cosmological neutral hydrogen signal from the Epoch of Reionization, and estimation of its basic physical parameters, is the principal scientific aim of many current low-frequency radio telescopes. Here we describe the Cosmological H
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1f2efcccbc99e44818279fc975ce83af
Autor:
Rachel L. Webster, John D. Bunton, Ron Remillard, Roger C. Cappallo, Thiagaraj Prabu, Eric Kratzenberg, Gianni Bernardi, Eric R. Morgan, Miguel F. Morales, Stephen M. Ord, Andrew Williams, Avinash A. Deshpande, Judd D. Bowman, W. Arcus, Christopher L. Williams, A. Roshi, M. J. Lynch, Colin J. Lonsdale, N. Uday Shankar, R. Koeing, David L. Kaplan, L. J. Greenhill, Divya Oberoi, Robert F. Goeke, Stephen R. McWhirter, David G. Barnes, Robert J. Sault, Bryna J. Hazelton, Bryan Gaensler, M. Waterson, Brian E. Corey, Alan R. Whitney, Joseph Pathikulangara, David Herne, Jacqueline N. Hewitt, Daniel A. Mitchell, Jamie Stevens, Steven Tingay, Alan E. E. Rogers, J. C. Kasper, R. B. Wayth, L. deSouza, Ravi Subrahmanyan, J. S. B. Wyithe, Joseph E. Salah, A. P. Beardsley, David Emrich, B. B. Kincaid, K. S. Srivani
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 425:1781-1788
Antenna layout is an important design consideration for radio interferometers because it determines the quality of the snapshot point spread function (PSF, or array beam). This is particularly true for experiments targeting the 21 cm Epoch of Reioniz
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3d122c078986847d84fe9e05b8599d70
https://doi.org/10.1111/j.1365-2966.2012.20878.x
https://doi.org/10.1111/j.1365-2966.2012.20878.x