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J/ApJ/846/L19     115-155MHz radio survey of Fermi sources     (Pleunis+, 2017)

A millisecond pulsar discovery in a survey of unidentified Fermi γ-ray sources with LOFAR. Pleunis Z., Bassa C.G., Hessels J.W.T., Kondratiev V.I., Camilo F., Cognard I., Griessmeier J.-M., Stappers B.W., van Amesfoort A.S., Sanidas S. <Astrophys. J., 846, L19 (2017)> =2017ApJ...846L..19P
ADC_Keywords: Gamma rays ; Pulsars ; Radio sources ; Surveys Keywords: gamma rays: stars; pulsars: general; pulsars: individual (PSR J1552+5437); stars: neutron; surveys Abstract: Using LOFAR, we have performed a very-low-frequency (115-155MHz) radio survey for millisecond pulsars (MSPs). The survey targeted 52 unidentified Fermi γ-ray sources. Employing a combination of coherent and incoherent dedispersion, we have mitigated the dispersive effects of the interstellar medium while maintaining sensitivity to fast-spinning pulsars. Toward 3FGLJ1553.1+5437 we have found PSRJ1552+5437, the first MSP to be discovered (through its pulsations) at a radio frequency <200MHz. PSR J1552+5437 is an isolated MSP with a 2.43ms spin period and a dispersion measure of 22.9pc/cm3. The pulsar has a very steep radio spectral index (α-2.8±0.4). We obtain a phase-connected timing solution combining the 0.74yr of radio observations with γ-ray photon arrival times covering 7.5yr of Fermi observations. We find that the radio and γ-ray pulse profiles of PSR J1552+5437 appear to be nearly aligned. The very steep spectrum of PSR J1552+5437, along with other recent discoveries, hints at a population of radio MSPs that have been missed in surveys using higher observing frequencies. Detecting such steep spectrum sources is important for mapping the population of MSPs down to the shortest spin periods, understanding their emission in comparison to slow pulsars, and quantifying the prospects for future surveys with low-frequency radio telescopes like SKA-Low and its precursors. Description: We have used the Low-Frequency Array (LOFAR) High Band Antennas (HBAs) of 21 of the 24 LOFAR Core stations to form 7 tied-array beams. This observational setup has baselines up to 2.3km and provides tied-array beams of ∼3.5' in diameter (FWHM) at the central frequency, with 7 beams covering a total circular field-of-view (FoV) of about 10' in diameter (see Figure 1). With this setup we have observed 52 out of 1010 unidentified γ-ray sources from the 3FGL Fermi-LAT point-source catalog (Acero+ 2015, J/ApJS/218/23). To maximize sensitivity and FoV we have used signals from 200 subbands in the 115-155MHz frequency range (39.06MHz bandwidth). See section 2. Objects: ------------------------------------------------------------- RA (ICRS) DE Designation(s) ------------------------------------------------------------- 15 52 53.33 +54 37 05.8 PSR J1552+5437 = PSR J1552+5437 ------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 47 52 LOFAR survey of unidentified Fermi-LAT sources: source information
See also: B/psr : ATNF Pulsar Catalogue (Manchester+, 2005) J/ApJ/605/759 : Multifrequency obs. of radio pulse broadening (Bhat+, 2004) J/ApJS/208/17 : 2nd Fermi LAT cat. of gamma-ray pulsars (2PC) (Abdo+, 2013) J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015) J/ApJ/810/85 : Obs. of first Fermi-LAT sources at Parkes (Camilo+, 2015) J/ApJ/814/128 : Timing noise & astrometry of Fermi-LAT pulsars (Kerr+, 2015) J/ApJ/829/119 : Known pulsars identified in the TGSS ADR (Frail+, 2016) J/ApJ/820/8 : 3FGL sources statistical classifications (Saz Parkinson+, 2016) J/ApJ/838/139 : Radio follow-up on 3FGL unassociated sources (Schinzel+, 2017) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [3FGL] 6- 17 A12 --- 3FGL Source identifier (JHHMM.m+DDMM) 19- 23 I5 d Epoch [57344/57445] Modified Julian Date of the observation 25- 28 F4.1 deg Alt [40.2/87.1] Altitude (1) 30- 34 F5.1 deg Az [0.7/289.4] Azimuth (1) 36- 39 F4.2 arcmin r95 [2.3/8.2] The 95% confidence radius (2) 41- 43 I3 pc/cm3 DM1 [20/119] NE2001 maximum galactic dispersion measure (3) 45- 47 I3 pc/cm3 DM2 [12/163] YMW16 maximum galactic dispersion measure (3)
Note (1): At the midpoint of the LOFAR observation. Note (2): Semi-major axis of 95% confidence error region in the 3FGL catalog (Acero+, 2015, J/ApJS/218/23). Note (3): According to the Cordes & Lazio ( ; NE2001) and the Yao+ (2017ApJ...835...29Y ; YMW16) models for Galactic electron density.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 28-May-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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