The LOFAR Two-metre Sky Survey: II. First data release

The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high-resolution 120-168 MHz survey of the entire northern sky for which observations are now 20% complete. We present our first full-quality public data release. For this data release 424 square degrees, or 2% of the eventual coverage,...

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Main Authors:	Shimwell, T.W., Tasse, C., Hardcastle, M.J., Mechev, A.P., Williams, W.L., Best, P.N., Röttgering, H.J.A., Callingham, J.R., Dijkema, T.J., De Gasperin, F., Hoang, D.N., Hugo, B., Mirmont, M., Oonk, J.B.R., Prandoni, I., Rafferty, D., Sabater, J., Smirnov, O., Van Weeren, R.J., White, G.J., Atemkeng, M., Bester, L., Bonnassieux, E., Brüggen, M., Brunetti, G., Chy, K.T., Cochrane, R., Conway, J.E., Croston, J.H., Danezi, A., Duncan, K., Haverkorn, M., Heald, G.H., Iacobelli, M., Intema, Huib, Jackson, N., Jamrozy, M., Jarvis, M.J., Lakhoo, R., Mevius, M., Miley, G.K., Morabito, L., Morganti, R., Nisbet, D., Orrú, E., Perkins, S., Pizzo, R.F., Schrijvers, C., Smith, D.J.B., Vermeulen, R., Wise, M.W., Alegre, L., Bacon, D.J., Van Bemmel, I.M., Beswick, R.J., Bonafede, A., Botteon, A., Bourke, S., Brienza, M., Calistro Rivera, G., Cassano, R., Clarke, A.O., Conselice, C.J., Dettmar, R.J., Drabent, A., Dumba, C., Emig, K.L., Enßlin, T.A., Ferrari, C., Garrett, M.A., Génova-Santos, R.T., Goyal, A., Gürkan, G., Hale, C., Harwood, J.J., Heesen, V., Hoeft, M., Horellou, C., Jackson, Carole, Kokotanekov, G., Kondapally, R., Kunert-Bajraszewska, M., Mahatma, V., Mahony, E.K., Mandal, S., McKean, J.P., Merloni, A., Mingo, B., Miskolczi, A., Mooney, S., Nikiel-Wroczyński, B., O'Sullivan, S.P., Quinn, J., Reich, W., Roskowiński, C., Rowlinson, A., Savini, F., Saxena, A., Schwarz, D.J., Shulevski, A.
Format:	Journal Article
Language:	English
Published:	EDP SCIENCES S A 2019
Subjects:	Science & Technology Physical Sciences Astronomy & Astrophysics surveys catalogs radio continuum: general techniques: image processing UNDERSTANDING RADIO POLARIMETRY FLUX-DENSITY SCALE CLUSTER ENVIRONMENTS IMAGING SURVEY SOUTHERN SKY GALAXY CALIBRATION DISCOVERY EMISSION AGN
Online Access:	http://hdl.handle.net/20.500.11937/76023

_version_	1848763606564339712
author	Shimwell, T.W. Tasse, C. Hardcastle, M.J. Mechev, A.P. Williams, W.L. Best, P.N. Röttgering, H.J.A. Callingham, J.R. Dijkema, T.J. De Gasperin, F. Hoang, D.N. Hugo, B. Mirmont, M. Oonk, J.B.R. Prandoni, I. Rafferty, D. Sabater, J. Smirnov, O. Van Weeren, R.J. White, G.J. Atemkeng, M. Bester, L. Bonnassieux, E. Brüggen, M. Brunetti, G. Chy, K.T. Cochrane, R. Conway, J.E. Croston, J.H. Danezi, A. Duncan, K. Haverkorn, M. Heald, G.H. Iacobelli, M. Intema, Huib Jackson, N. Jamrozy, M. Jarvis, M.J. Lakhoo, R. Mevius, M. Miley, G.K. Morabito, L. Morganti, R. Nisbet, D. Orrú, E. Perkins, S. Pizzo, R.F. Schrijvers, C. Smith, D.J.B. Vermeulen, R. Wise, M.W. Alegre, L. Bacon, D.J. Van Bemmel, I.M. Beswick, R.J. Bonafede, A. Botteon, A. Bourke, S. Brienza, M. Calistro Rivera, G. Cassano, R. Clarke, A.O. Conselice, C.J. Dettmar, R.J. Drabent, A. Dumba, C. Emig, K.L. Enßlin, T.A. Ferrari, C. Garrett, M.A. Génova-Santos, R.T. Goyal, A. Gürkan, G. Hale, C. Harwood, J.J. Heesen, V. Hoeft, M. Horellou, C. Jackson, Carole Kokotanekov, G. Kondapally, R. Kunert-Bajraszewska, M. Mahatma, V. Mahony, E.K. Mandal, S. McKean, J.P. Merloni, A. Mingo, B. Miskolczi, A. Mooney, S. Nikiel-Wroczyński, B. O'Sullivan, S.P. Quinn, J. Reich, W. Roskowiński, C. Rowlinson, A. Savini, F. Saxena, A. Schwarz, D.J. Shulevski, A.
author_facet	Shimwell, T.W. Tasse, C. Hardcastle, M.J. Mechev, A.P. Williams, W.L. Best, P.N. Röttgering, H.J.A. Callingham, J.R. Dijkema, T.J. De Gasperin, F. Hoang, D.N. Hugo, B. Mirmont, M. Oonk, J.B.R. Prandoni, I. Rafferty, D. Sabater, J. Smirnov, O. Van Weeren, R.J. White, G.J. Atemkeng, M. Bester, L. Bonnassieux, E. Brüggen, M. Brunetti, G. Chy, K.T. Cochrane, R. Conway, J.E. Croston, J.H. Danezi, A. Duncan, K. Haverkorn, M. Heald, G.H. Iacobelli, M. Intema, Huib Jackson, N. Jamrozy, M. Jarvis, M.J. Lakhoo, R. Mevius, M. Miley, G.K. Morabito, L. Morganti, R. Nisbet, D. Orrú, E. Perkins, S. Pizzo, R.F. Schrijvers, C. Smith, D.J.B. Vermeulen, R. Wise, M.W. Alegre, L. Bacon, D.J. Van Bemmel, I.M. Beswick, R.J. Bonafede, A. Botteon, A. Bourke, S. Brienza, M. Calistro Rivera, G. Cassano, R. Clarke, A.O. Conselice, C.J. Dettmar, R.J. Drabent, A. Dumba, C. Emig, K.L. Enßlin, T.A. Ferrari, C. Garrett, M.A. Génova-Santos, R.T. Goyal, A. Gürkan, G. Hale, C. Harwood, J.J. Heesen, V. Hoeft, M. Horellou, C. Jackson, Carole Kokotanekov, G. Kondapally, R. Kunert-Bajraszewska, M. Mahatma, V. Mahony, E.K. Mandal, S. McKean, J.P. Merloni, A. Mingo, B. Miskolczi, A. Mooney, S. Nikiel-Wroczyński, B. O'Sullivan, S.P. Quinn, J. Reich, W. Roskowiński, C. Rowlinson, A. Savini, F. Saxena, A. Schwarz, D.J. Shulevski, A.
author_sort	Shimwell, T.W.
building	Curtin Institutional Repository
collection	Online Access
description	The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high-resolution 120-168 MHz survey of the entire northern sky for which observations are now 20% complete. We present our first full-quality public data release. For this data release 424 square degrees, or 2% of the eventual coverage, in the region of the HETDEX Spring Field (right ascension 10h45m00s to 15h30m00s and declination 45°00′00″ to 57°00′00″) were mapped using a fully automated direction-dependent calibration and imaging pipeline that we developed. A total of 325 694 sources are detected with a signal of at least five times the noise, and the source density is a factor of ∼10 higher than the most sensitive existing very wide-area radio-continuum surveys. The median sensitivity is S144 MHz = 71 μJy beam -1 and the point-source completeness is 90% at an integrated flux density of 0.45 mJy. The resolution of the images is 6″ and the positional accuracy is within 0.2″. This data release consists of a catalogue containing location, flux, and shape estimates together with 58 mosaic images that cover the catalogued area. In this paper we provide an overview of the data release with a focus on the processing of the LOFAR data and the characteristics of the resulting images. In two accompanying papers we provide the radio source associations and deblending and, where possible, the optical identifications of the radio sources together with the photometric redshifts and properties of the host galaxies. These data release papers are published together with a further ∼20 articles that highlight the scientific potential of LoTSS.
first_indexed	2025-11-14T11:06:08Z
format	Journal Article
id	curtin-20.500.11937-76023
institution	Curtin University Malaysia
institution_category	Local University
language	English
last_indexed	2025-11-14T11:06:08Z
publishDate	2019
publisher	EDP SCIENCES S A
recordtype	eprints
repository_type	Digital Repository
spelling	curtin-20.500.11937-760232019-07-23T05:26:13Z The LOFAR Two-metre Sky Survey: II. First data release Shimwell, T.W. Tasse, C. Hardcastle, M.J. Mechev, A.P. Williams, W.L. Best, P.N. Röttgering, H.J.A. Callingham, J.R. Dijkema, T.J. De Gasperin, F. Hoang, D.N. Hugo, B. Mirmont, M. Oonk, J.B.R. Prandoni, I. Rafferty, D. Sabater, J. Smirnov, O. Van Weeren, R.J. White, G.J. Atemkeng, M. Bester, L. Bonnassieux, E. Brüggen, M. Brunetti, G. Chy, K.T. Cochrane, R. Conway, J.E. Croston, J.H. Danezi, A. Duncan, K. Haverkorn, M. Heald, G.H. Iacobelli, M. Intema, Huib Jackson, N. Jamrozy, M. Jarvis, M.J. Lakhoo, R. Mevius, M. Miley, G.K. Morabito, L. Morganti, R. Nisbet, D. Orrú, E. Perkins, S. Pizzo, R.F. Schrijvers, C. Smith, D.J.B. Vermeulen, R. Wise, M.W. Alegre, L. Bacon, D.J. Van Bemmel, I.M. Beswick, R.J. Bonafede, A. Botteon, A. Bourke, S. Brienza, M. Calistro Rivera, G. Cassano, R. Clarke, A.O. Conselice, C.J. Dettmar, R.J. Drabent, A. Dumba, C. Emig, K.L. Enßlin, T.A. Ferrari, C. Garrett, M.A. Génova-Santos, R.T. Goyal, A. Gürkan, G. Hale, C. Harwood, J.J. Heesen, V. Hoeft, M. Horellou, C. Jackson, Carole Kokotanekov, G. Kondapally, R. Kunert-Bajraszewska, M. Mahatma, V. Mahony, E.K. Mandal, S. McKean, J.P. Merloni, A. Mingo, B. Miskolczi, A. Mooney, S. Nikiel-Wroczyński, B. O'Sullivan, S.P. Quinn, J. Reich, W. Roskowiński, C. Rowlinson, A. Savini, F. Saxena, A. Schwarz, D.J. Shulevski, A. Science & Technology Physical Sciences Astronomy & Astrophysics surveys catalogs radio continuum: general techniques: image processing UNDERSTANDING RADIO POLARIMETRY FLUX-DENSITY SCALE CLUSTER ENVIRONMENTS IMAGING SURVEY SOUTHERN SKY GALAXY CALIBRATION DISCOVERY EMISSION AGN The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high-resolution 120-168 MHz survey of the entire northern sky for which observations are now 20% complete. We present our first full-quality public data release. For this data release 424 square degrees, or 2% of the eventual coverage, in the region of the HETDEX Spring Field (right ascension 10h45m00s to 15h30m00s and declination 45°00′00″ to 57°00′00″) were mapped using a fully automated direction-dependent calibration and imaging pipeline that we developed. A total of 325 694 sources are detected with a signal of at least five times the noise, and the source density is a factor of ∼10 higher than the most sensitive existing very wide-area radio-continuum surveys. The median sensitivity is S144 MHz = 71 μJy beam -1 and the point-source completeness is 90% at an integrated flux density of 0.45 mJy. The resolution of the images is 6″ and the positional accuracy is within 0.2″. This data release consists of a catalogue containing location, flux, and shape estimates together with 58 mosaic images that cover the catalogued area. In this paper we provide an overview of the data release with a focus on the processing of the LOFAR data and the characteristics of the resulting images. In two accompanying papers we provide the radio source associations and deblending and, where possible, the optical identifications of the radio sources together with the photometric redshifts and properties of the host galaxies. These data release papers are published together with a further ∼20 articles that highlight the scientific potential of LoTSS. 2019 Journal Article http://hdl.handle.net/20.500.11937/76023 10.1051/0004-6361/201833559 English EDP SCIENCES S A fulltext
spellingShingle	Science & Technology Physical Sciences Astronomy & Astrophysics surveys catalogs radio continuum: general techniques: image processing UNDERSTANDING RADIO POLARIMETRY FLUX-DENSITY SCALE CLUSTER ENVIRONMENTS IMAGING SURVEY SOUTHERN SKY GALAXY CALIBRATION DISCOVERY EMISSION AGN Shimwell, T.W. Tasse, C. Hardcastle, M.J. Mechev, A.P. Williams, W.L. Best, P.N. Röttgering, H.J.A. Callingham, J.R. Dijkema, T.J. De Gasperin, F. Hoang, D.N. Hugo, B. Mirmont, M. Oonk, J.B.R. Prandoni, I. Rafferty, D. Sabater, J. Smirnov, O. Van Weeren, R.J. White, G.J. Atemkeng, M. Bester, L. Bonnassieux, E. Brüggen, M. Brunetti, G. Chy, K.T. Cochrane, R. Conway, J.E. Croston, J.H. Danezi, A. Duncan, K. Haverkorn, M. Heald, G.H. Iacobelli, M. Intema, Huib Jackson, N. Jamrozy, M. Jarvis, M.J. Lakhoo, R. Mevius, M. Miley, G.K. Morabito, L. Morganti, R. Nisbet, D. Orrú, E. Perkins, S. Pizzo, R.F. Schrijvers, C. Smith, D.J.B. Vermeulen, R. Wise, M.W. Alegre, L. Bacon, D.J. Van Bemmel, I.M. Beswick, R.J. Bonafede, A. Botteon, A. Bourke, S. Brienza, M. Calistro Rivera, G. Cassano, R. Clarke, A.O. Conselice, C.J. Dettmar, R.J. Drabent, A. Dumba, C. Emig, K.L. Enßlin, T.A. Ferrari, C. Garrett, M.A. Génova-Santos, R.T. Goyal, A. Gürkan, G. Hale, C. Harwood, J.J. Heesen, V. Hoeft, M. Horellou, C. Jackson, Carole Kokotanekov, G. Kondapally, R. Kunert-Bajraszewska, M. Mahatma, V. Mahony, E.K. Mandal, S. McKean, J.P. Merloni, A. Mingo, B. Miskolczi, A. Mooney, S. Nikiel-Wroczyński, B. O'Sullivan, S.P. Quinn, J. Reich, W. Roskowiński, C. Rowlinson, A. Savini, F. Saxena, A. Schwarz, D.J. Shulevski, A. The LOFAR Two-metre Sky Survey: II. First data release
title	The LOFAR Two-metre Sky Survey: II. First data release
title_full	The LOFAR Two-metre Sky Survey: II. First data release
title_fullStr	The LOFAR Two-metre Sky Survey: II. First data release
title_full_unstemmed	The LOFAR Two-metre Sky Survey: II. First data release
title_short	The LOFAR Two-metre Sky Survey: II. First data release
title_sort	lofar two-metre sky survey: ii. first data release
topic	Science & Technology Physical Sciences Astronomy & Astrophysics surveys catalogs radio continuum: general techniques: image processing UNDERSTANDING RADIO POLARIMETRY FLUX-DENSITY SCALE CLUSTER ENVIRONMENTS IMAGING SURVEY SOUTHERN SKY GALAXY CALIBRATION DISCOVERY EMISSION AGN
url	http://hdl.handle.net/20.500.11937/76023

The LOFAR Two-metre Sky Survey: II. First data release

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