# University of Hertfordshire

## LOFAR observations of the XMM-LSS field

Research output: Contribution to journalArticle

### Standard

LOFAR observations of the XMM-LSS field. / Hale, C. L.; Williams, W.; Jarvis, M. J.; Hardcastle, M. J.; Morabito, Leah K.; Shimwell, T. W.; Tasse, C.; Best, P. N.; Harwood, J. J.; Heywood, I.; Prandoni, I.; Röttgering, H. J. A.; Sabater, J.; Smith, D. J. B.; Weeren, R. J. van.

In: Astronomy & Astrophysics, 19.11.2018.

Research output: Contribution to journalArticle

### Harvard

Hale, CL, Williams, W, Jarvis, MJ, Hardcastle, MJ, Morabito, LK, Shimwell, TW, Tasse, C, Best, PN, Harwood, JJ, Heywood, I, Prandoni, I, Röttgering, HJA, Sabater, J, Smith, DJB & Weeren, RJV 2018, 'LOFAR observations of the XMM-LSS field', Astronomy & Astrophysics. https://doi.org/10.1051/0004-6361/201833906

### APA

Hale, C. L., Williams, W., Jarvis, M. J., Hardcastle, M. J., Morabito, L. K., Shimwell, T. W., ... Weeren, R. J. V. (2018). LOFAR observations of the XMM-LSS field. Astronomy & Astrophysics. https://doi.org/10.1051/0004-6361/201833906

### Vancouver

Hale CL, Williams W, Jarvis MJ, Hardcastle MJ, Morabito LK, Shimwell TW et al. LOFAR observations of the XMM-LSS field. Astronomy & Astrophysics. 2018 Nov 19. https://doi.org/10.1051/0004-6361/201833906

### Author

Hale, C. L. ; Williams, W. ; Jarvis, M. J. ; Hardcastle, M. J. ; Morabito, Leah K. ; Shimwell, T. W. ; Tasse, C. ; Best, P. N. ; Harwood, J. J. ; Heywood, I. ; Prandoni, I. ; Röttgering, H. J. A. ; Sabater, J. ; Smith, D. J. B. ; Weeren, R. J. van. / LOFAR observations of the XMM-LSS field. In: Astronomy & Astrophysics. 2018.

### Bibtex

title = "LOFAR observations of the XMM-LSS field",
abstract = "We present observations of the XMM Large-Scale Structure (XMM-LSS) field observed with the LOw Frequency ARray (LOFAR) at 120-168 MHz. Centred at a J2000 declination of $-4.5^{\circ}$, this is a challenging field to observe with LOFAR because of its low elevation with respect to the array. The low elevation of this field reduces the effective collecting area of the telescope, thereby reducing sensitivity. This low elevation also causes the primary beam to be elongated in the north-south direction, which can introduce side lobes in the synthesised beam in this direction. However the XMM-LSS field is a key field to study because of the wealth of ancillary information, encompassing most of the electromagnetic spectrum. The field was observed for a total of 12 hours from three four-hour LOFAR tracks using the Dutch array. The final image presented encompasses $\sim 27$ deg$^2$, which is the region of the observations with a $>$50\{\%} primary beam response. Once combined, the observations reach a central rms of 280 $\mu$Jy beam$^{-1}$ at 144 MHz and have an angular resolution of $7.5 \times \ 8.5${"}. We present our catalogue of detected sources and investigate how our observations compare to previous radio observations. This includes investigating the flux scale calibration of these observations compared to previous measurements, the implied spectral indices of the sources, the observed source counts and corrections to obtain the true source counts, and finally the clustering of the observed radio sources.",
keywords = "astro-ph.GA",
author = "Hale, {C. L.} and W. Williams and Jarvis, {M. J.} and Hardcastle, {M. J.} and Morabito, {Leah K.} and Shimwell, {T. W.} and C. Tasse and Best, {P. N.} and Harwood, {J. J.} and I. Heywood and I. Prandoni and R{\"o}ttgering, {H. J. A.} and J. Sabater and Smith, {D. J. B.} and Weeren, {R. J. van}",
note = "15 figures, 8 tables and 24 pages. This paper is part of the LOFAR surveys data release 1 and has been accepted for publication in a special edition of A&A that will appear in Feb 2019, volume 622. The catalogues and images from the data release will be publicly available on lofar-surveys.org upon publication of the journal",
year = "2018",
month = "11",
day = "19",
doi = "10.1051/0004-6361/201833906",
language = "English",
journal = "Astronomy & Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",

}

### RIS

TY - JOUR

T1 - LOFAR observations of the XMM-LSS field

AU - Hale, C. L.

AU - Williams, W.

AU - Jarvis, M. J.

AU - Hardcastle, M. J.

AU - Morabito, Leah K.

AU - Shimwell, T. W.

AU - Tasse, C.

AU - Best, P. N.

AU - Harwood, J. J.

AU - Heywood, I.

AU - Prandoni, I.

AU - Röttgering, H. J. A.

AU - Sabater, J.

AU - Smith, D. J. B.

AU - Weeren, R. J. van

N1 - 15 figures, 8 tables and 24 pages. This paper is part of the LOFAR surveys data release 1 and has been accepted for publication in a special edition of A&A that will appear in Feb 2019, volume 622. The catalogues and images from the data release will be publicly available on lofar-surveys.org upon publication of the journal

PY - 2018/11/19

Y1 - 2018/11/19

N2 - We present observations of the XMM Large-Scale Structure (XMM-LSS) field observed with the LOw Frequency ARray (LOFAR) at 120-168 MHz. Centred at a J2000 declination of $-4.5^{\circ}$, this is a challenging field to observe with LOFAR because of its low elevation with respect to the array. The low elevation of this field reduces the effective collecting area of the telescope, thereby reducing sensitivity. This low elevation also causes the primary beam to be elongated in the north-south direction, which can introduce side lobes in the synthesised beam in this direction. However the XMM-LSS field is a key field to study because of the wealth of ancillary information, encompassing most of the electromagnetic spectrum. The field was observed for a total of 12 hours from three four-hour LOFAR tracks using the Dutch array. The final image presented encompasses $\sim 27$ deg$^2$, which is the region of the observations with a $>$50\% primary beam response. Once combined, the observations reach a central rms of 280 $\mu$Jy beam$^{-1}$ at 144 MHz and have an angular resolution of $7.5 \times \ 8.5$". We present our catalogue of detected sources and investigate how our observations compare to previous radio observations. This includes investigating the flux scale calibration of these observations compared to previous measurements, the implied spectral indices of the sources, the observed source counts and corrections to obtain the true source counts, and finally the clustering of the observed radio sources.

AB - We present observations of the XMM Large-Scale Structure (XMM-LSS) field observed with the LOw Frequency ARray (LOFAR) at 120-168 MHz. Centred at a J2000 declination of $-4.5^{\circ}$, this is a challenging field to observe with LOFAR because of its low elevation with respect to the array. The low elevation of this field reduces the effective collecting area of the telescope, thereby reducing sensitivity. This low elevation also causes the primary beam to be elongated in the north-south direction, which can introduce side lobes in the synthesised beam in this direction. However the XMM-LSS field is a key field to study because of the wealth of ancillary information, encompassing most of the electromagnetic spectrum. The field was observed for a total of 12 hours from three four-hour LOFAR tracks using the Dutch array. The final image presented encompasses $\sim 27$ deg$^2$, which is the region of the observations with a $>$50\% primary beam response. Once combined, the observations reach a central rms of 280 $\mu$Jy beam$^{-1}$ at 144 MHz and have an angular resolution of $7.5 \times \ 8.5$". We present our catalogue of detected sources and investigate how our observations compare to previous radio observations. This includes investigating the flux scale calibration of these observations compared to previous measurements, the implied spectral indices of the sources, the observed source counts and corrections to obtain the true source counts, and finally the clustering of the observed radio sources.

KW - astro-ph.GA

U2 - 10.1051/0004-6361/201833906

DO - 10.1051/0004-6361/201833906

M3 - Article

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

ER -