2021A&A...648A.104D


Query : 2021A&A...648A.104D

2021A&A...648A.104D - Astronomy and Astrophysics, volume 648A, 104-104 (2021/4-1)

The LOFAR LBA Sky Survey. I. Survey description and preliminary data release.

DE GASPERIN F., WILLIAMS W.L., BEST P., BRUGGEN M., BRUNETTI G., CUCITI V., DIJKEMA T.J., HARDCASTLE M.J., NORDEN M.J., OFFRINGA A., SHIMWELL T., VAN WEEREN R., BOMANS D., BONAFEDE A., BOTTEON A., CALLINGHAM J.R., CASSANO R., CHYZY K.T., EMIG K.L., EDLER H., HAVERKORN M., HEALD G., HEESEN V., IACOBELLI M., INTEMA H.T., KADLER M., MALEK K., MEVIUS M., MILEY G., MINGO B., MORABITO L.K., SABATER J., MORGANTI R., ORRU E., PIZZO R., PRANDONI I., SHULEVSKI A., TASSE C., VACCARI M., ZARKA P. and ROTTGERING H.

Abstract (from CDS):


Context. The LOw Frequency ARray (LOFAR) is the only radio telescope that is presently capable of high-sensitivity, high-resolution (i.e. <1mJy/beam and <15'') observations at ultra-low frequencies (<100MHz). To utilise these capabilities, the LOFAR Surveys Key Science Project is undertaking a large survey to cover the entire northern sky with Low Band Antenna (LBA) observations.
Aims. The LOFAR LBA Sky Survey (LoLSS) aims to cover the entire northern sky with 3170 pointings in the frequency range between 42-66MHz, at a resolution of 15'' and at a sensitivity of 1mJy/beam (1σ). In this work, we outline the survey strategy, the observational status, and the calibration techniques. We also briefly describe several of our scientific motivations and present the preliminary public data release.
Methods. The preliminary images were produced using a fully automated pipeline aimed at correcting all direction-independent effects in the data. Whilst the direction-dependent effects, such as those from the ionosphere, have not yet been corrected, the images presented in this work are still ten times more sensitive than previous available surveys at these low frequencies.
Results. The preliminary data release covers 740 deg2 around the HETDEX spring field region at an angular resolution of 47'' with a median noise level of 5mJy/beam. The images and the catalogue of 25247 sources have been publicly released. We demonstrate that the system is capable of reaching a root mean square (rms) noise of 1mJy/beam and an angular resolution of 15'' once direction-dependent effects are accounted for.
Conclusions. LoLSS will provide the ultra-low-frequency information for hundreds of thousands of radio sources, providing critical spectral information and producing a unique data set that can be used for a wide range of science topics, such as the search for high redshift galaxies and quasars, the study of the magnetosphere of exoplanets, and the detection of the oldest populations of cosmic-rays in galaxies, clusters of galaxies, as well as those produced by active galactic nuclei.

Abstract Copyright: © ESO 2021

Journal keyword(s): surveys - catalogs - radio continuum: general - techniques: image processing

VizieR on-line data: <Available at CDS (J/A+A/648/A104): lolssv3.dat list.dat fits/*>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 20

goto Full paper

goto View the references in ADS

Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 G 272-61B Er* 01 39 01.6377185550 -17 57 01.001240728           M6V 826 0
2 ACO 3391 ClG 06 26 15.4 -53 40 52           ~ 186 1
3 ACO 3395 ClG 06 27 31.1 -54 23 58           ~ 193 0
4 3C 196 Sy1 08 13 36.0561170112 +48 13 02.644966020   18.36 17.79     ~ 523 2
5 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 793 0
6 ACO 1314 ClG 11 34 48.7 +49 02 25           ~ 207 1
7 G 122-49 PM* 11 50 57.7205259231 +48 22 38.561183125       12.95   M4.5V 97 0
8 MCG+10-18-009 G 12 13 23.0664220656 +56 35 40.648404660   17       ~ 5 0
9 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2249 3
10 ACO 1550 ClG 12 29 02.5 +47 37 20           ~ 41 0
11 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4113 4
12 * tau Boo Ro* 13 47 15.7381720026 +17 27 24.809555600 5.02 4.98 4.49 4.09 3.85 F7IV-V 945 1
13 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2737 2
14 3C 295 Sy2 14 11 20.467 +52 12 09.52   22.34 20.80 18.54   ~ 948 5
15 NAME NOAO Deep Wide Field reg 14 32 05.75 +34 16 47.5           ~ 365 0
16 ELAIS N1 reg 16 10 01 +54 30.6           ~ 367 0
17 ACO 2256 ClG 17 03 43.5 +78 43 03           ~ 859 1
18 ICRF J182931.7+484446 Sy1 18 29 31.7809732968 +48 44 46.160168892   17.05 16.81 16.860   ~ 663 1
19 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2256 2
20 NAME Cas A SNR 23 23 24.000 +58 48 54.00     14.30     ~ 2629 1

To bookmark this query, right click on this link: simbad:objects in 2021A&A...648A.104D and select 'bookmark this link' or equivalent in the popup menu


2022.09.24-19:26:16

© Université de Strasbourg/CNRS

    • Contact