2019A&A...626A.104S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:33:49

2019A&A...626A.104S - Astronomy and Astrophysics, volume 626A, 104-104 (2019/6-1)

The LOFAR Tied-Array All-Sky Survey (LOTAAS): Survey overview and initial pulsar discoveries.

SANIDAS S., COOPER S., BASSA C.G., HESSELS J.W.T., KONDRATIEV V.I., MICHILLI D., STAPPERS B.W., TAN C.M., VAN LEEUWEN J., CERRIGONE L., FALLOWS R.A., IACOBELLI M., ORRU E., PIZZO R.F., SHULEVSKI A., TORIBIO M.C., TER VEEN S., ZUCCA P., BONDONNEAU L., GRIESSMEIER J.-M., KARASTERGIOU A., KRAMER M. and SOBEY C.

Abstract (from CDS):

We present an overview of the LOFAR Tied-Array All-Sky Survey (LOTAAS) for radio pulsars and fast transients. The survey uses the high-band antennas of the LOFAR Superterp, the dense inner part of the LOFAR core, to survey the northern sky (δ>0°) at a central observing frequency of 135MHz. A total of 219 tied-array beams (coherent summation of station signals, covering 12 square degrees), as well as three incoherent beams (covering 67 square degrees) are formed in each survey pointing. For each of the 222 beams, total intensity is recorded at 491.52 µs time resolution. Each observation integrates for 1hr and covers 2592 channels from 119 to 151MHz. This instrumental setup allows LOTAAS to reach a detection threshold of 1-5mJy for periodic emission. Thus far, the LOTAAS survey has resulted in the discovery of 73 radio pulsars. Among these are two mildly recycled binary millisecond pulsars (P=13 and 33ms), as well as the slowest-spinning radio pulsar currently known (P=23.5s). The survey has thus far detected 311 known pulsars, with spin periods ranging from 4ms to 5.0s and dispersion measures from 3.0 to 217pc/cm3. Known pulsars are detected at flux densities consistent with literature values. We find that the LOTAAS pulsar discoveries have, on average, longer spin periods than the known pulsar population. This may reflect different selection biases between LOTAAS and previous surveys, though it is also possible that slower-spinning pulsars preferentially have steeper radio spectra. LOTAAS is the deepest all-sky pulsar survey using a digital aperture array; we discuss some of the lessons learned that can inform the approach for similar surveys using future radio telescopes such as the Square Kilometre Array.

Abstract Copyright: © ESO 2019

Journal keyword(s): pulsars: general - methods: data analysis - methods: observational

VizieR on-line data: <Available at CDS (J/A+A/626/A104): table2.dat tablea1.dat>

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

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 PSR J0250+5854 Psr 02 50 17.78 +58 54 01.3           ~ 11 0
2 PSR B0329+54 Psr 03 32 59.3462817079 +54 34 45.047901390           ~ 576 1
3 PSR J0337+1715 Psr 03 37 43.82589 +17 15 14.8280           ~ 64 0
4 PSR J1023+0038 LXB 10 23 47.6840307966 +00 38 41.006983532     17.31     GV 309 0
5 PSR J1404+12 Psr 14 04 36.961 +11 59 14.40           ~ 2 0
6 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11540 0
7 PSR J1746+2540 Psr 17 46 06.87 +25 40 37.5           ~ 8 0
8 PSR J2053+17 Psr 20 53.9 +17 17           ~ 3 1

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:33:49

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