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The LOFAR Two-metre Sky Survey: Deep Fields Data Release 2. I. The ELAIS-N1 field

Fuente: arXiv

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Detalles Bibliográficos
Autores principales:	Shimwell, T. W., Hale, C. L., Best, P. N., Botteon, A., Drabent, A., Hardcastle, M. J., Jelić, V., de Jong, J. M. G. H. J., Kondapally, R., Röttgering, H. J. A., Tasse, C., van Weeren, R. J., Williams, W. L., Bonafede, A., Bondi, M., Brüggen, M., Brunetti, G., Callingham, J. R., De Gasperin, F., Duncan, K. J., Horellou, C., Iyer, S., de Ruiter, I., Małek, K., Nair, D. G., Morabito, L. K., Prandoni, I., Rowlinson, A., Sabater, J., Shulevski, A., Smith, D. J. B., Sweijen, F.
Formato:	Preprint
Publicado:	2025
Materias:	Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics
Acceso en línea:	Acceder al recurso
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

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author	Shimwell, T. W. Hale, C. L. Best, P. N. Botteon, A. Drabent, A. Hardcastle, M. J. Jelić, V. de Jong, J. M. G. H. J. Kondapally, R. Röttgering, H. J. A. Tasse, C. van Weeren, R. J. Williams, W. L. Bonafede, A. Bondi, M. Brüggen, M. Brunetti, G. Callingham, J. R. De Gasperin, F. Duncan, K. J. Horellou, C. Iyer, S. de Ruiter, I. Małek, K. Nair, D. G. Morabito, L. K. Prandoni, I. Rowlinson, A. Sabater, J. Shulevski, A. Smith, D. J. B. Sweijen, F.
author_facet	Shimwell, T. W. Hale, C. L. Best, P. N. Botteon, A. Drabent, A. Hardcastle, M. J. Jelić, V. de Jong, J. M. G. H. J. Kondapally, R. Röttgering, H. J. A. Tasse, C. van Weeren, R. J. Williams, W. L. Bonafede, A. Bondi, M. Brüggen, M. Brunetti, G. Callingham, J. R. De Gasperin, F. Duncan, K. J. Horellou, C. Iyer, S. de Ruiter, I. Małek, K. Nair, D. G. Morabito, L. K. Prandoni, I. Rowlinson, A. Sabater, J. Shulevski, A. Smith, D. J. B. Sweijen, F.
contents	We present the final 6'' resolution data release of the ELAIS-N1 field from the LOw-Frequency ARray (LOFAR) Two-metre Sky Survey Deep Fields project (LoTSS Deep). The 144MHz images are the most sensitive achieved to date at this frequency and were created from 290 TB of data obtained from 505 hrs on-source observations taken over 7.5 years. The data were processed following the strategies developed for previous LoTSS and LoTSS Deep data releases. The resulting images span 24.53 square degrees and, using a refined source detection approach, we identified 154,952 radio sources formed from 182,184 Gaussian components within this area. The maps reach a noise level of 10.7 $μ$Jy/beam at 6'' resolution where approximately half of the noise is due to source confusion. In about 7.4% of the image our limited dynamic range around bright sources results in a further > 5% increase in the noise. The images have a flux density scale accuracy of about 9% and the standard deviation of offsets between our source positions and those from Pan-STARRS is 0.2'' in RA and Dec for high significance detections. We searched individual epoch images for variable sources, identifying 39 objects with considerable variation. We also searched for circularly polarised sources achieving three detections of previously known emitters (two stars and one pulsar) whilst constraining the typical polarisation fraction plus leakage to be less than 0.045%.
format	Preprint
id	arxiv_https___arxiv_org_abs_2501_04093
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	The LOFAR Two-metre Sky Survey: Deep Fields Data Release 2. I. The ELAIS-N1 field Shimwell, T. W. Hale, C. L. Best, P. N. Botteon, A. Drabent, A. Hardcastle, M. J. Jelić, V. de Jong, J. M. G. H. J. Kondapally, R. Röttgering, H. J. A. Tasse, C. van Weeren, R. J. Williams, W. L. Bonafede, A. Bondi, M. Brüggen, M. Brunetti, G. Callingham, J. R. De Gasperin, F. Duncan, K. J. Horellou, C. Iyer, S. de Ruiter, I. Małek, K. Nair, D. G. Morabito, L. K. Prandoni, I. Rowlinson, A. Sabater, J. Shulevski, A. Smith, D. J. B. Sweijen, F. Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics We present the final 6'' resolution data release of the ELAIS-N1 field from the LOw-Frequency ARray (LOFAR) Two-metre Sky Survey Deep Fields project (LoTSS Deep). The 144MHz images are the most sensitive achieved to date at this frequency and were created from 290 TB of data obtained from 505 hrs on-source observations taken over 7.5 years. The data were processed following the strategies developed for previous LoTSS and LoTSS Deep data releases. The resulting images span 24.53 square degrees and, using a refined source detection approach, we identified 154,952 radio sources formed from 182,184 Gaussian components within this area. The maps reach a noise level of 10.7 $μ$Jy/beam at 6'' resolution where approximately half of the noise is due to source confusion. In about 7.4% of the image our limited dynamic range around bright sources results in a further > 5% increase in the noise. The images have a flux density scale accuracy of about 9% and the standard deviation of offsets between our source positions and those from Pan-STARRS is 0.2'' in RA and Dec for high significance detections. We searched individual epoch images for variable sources, identifying 39 objects with considerable variation. We also searched for circularly polarised sources achieving three detections of previously known emitters (two stars and one pulsar) whilst constraining the typical polarisation fraction plus leakage to be less than 0.045%.
title	The LOFAR Two-metre Sky Survey: Deep Fields Data Release 2. I. The ELAIS-N1 field
topic	Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics
url	https://arxiv.org/abs/2501.04093