J/ApJ/846/L19ivo://CDS.VizieR/J/ApJ/846/L19doi:10.26093/cds/vizier.18469019CDSPleunis 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.2018-09-25T12:10:07Z2018-06-20T13:25:42ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgamma-ray-astronomypulsarsradio-sourcessurveysUsing LOFAR, we have performed a very-low-frequency (115-155MHz) radio survey for millisecond pulsars (MSPs). The survey targeted 52 unidentified Fermi {gamma}-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/cm^3^. The pulsar has a very steep radio spectral index ({alpha}-2.8+/-0.4). We obtain a phase-connected timing solution combining the 0.74yr of radio observations with {gamma}-ray photon arrival times covering 7.5yr of Fermi observations. We find that the radio and {gamma}-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.2017ApJ...846L..19Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/846/L19CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/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)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/846/L19https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/846/L19http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/846/L19https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/846/L19https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/846/L19http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/846/L19GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/846/L19/table1 (LOFAR survey of unidentified Fermi-LAT sources: source information)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/846/L19/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/846/L19/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/846/L19/table1?GETtext/xml+votable180.050000true4.29414.7610.0055555555555555566/189 428 2006 2539 2704 3419 3479 3557 3871 3937 4543 5450 5556 6406 7131 7553 7597 7660 7767 7947 8145 8474 8485 9417 9462 10427 11351 11457 11561 11693 12027 12102 12164 12207 12544 12693 15272 15910 16112 18110 18343 19545 19671 23884 24017 24064 27124 27381 28506 32249 32288 32559https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/846/L19?format=asciiGamma-rayRadiodefaultJ/ApJ/846/L19/table1LOFAR survey of unidentified Fermi-LAT sources: source informationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint3FGLSource identifier (JHHMM.m+DDMM)meta.id;meta.maincharEpoch[57344/57445] Modified Julian Date of the observationdtime.epochintAlt[40.2/87.1] Altitude (1)degpos.earth.altitude;instr.obstyfloatAz[0.7/289.4] Azimuth (1)degpos.earth.altitude;instr.obstyfloatr95[2.3/8.2] The 95% confidence radius (2)arcminphys.angSizefloatDM1[20/119] NE2001 maximum galactic dispersion measure (3)pc.cm**-3phys.dispMeasureintDM2[12/163] YMW16 maximum galactic dispersion measure (3)pc.cm**-3phys.dispMeasureintSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main