2015MNRAS.451.2493S

Query : 2015MNRAS.451.2493S

2015MNRAS.451.2493S - Mon. Not. R. Astron. Soc., 451, 2493-2506 (2015/August-2)

LOFAR discovery of a quiet emission mode in PSR B0823+26.

SOBEY C., YOUNG N.J., HESSELS J.W.T., WELTEVREDE P., NOUTSOS A., STAPPERS B.W., KRAMER M., BASSA C., LYNE A.G., KONDRATIEV V.I., HASSALL T.E., KEANE E.F., BILOUS A.V., BRETON R.P., GRIESSMEIER J.-M., KARASTERGIOU A., PILIA M., SERYLAK M., TER VEEN S., VAN LEEUWEN J., ALEXOV A., ANDERSON J., ASGEKAR A., AVRUCH I.M., BELL M.E., BENTUM M.J., BERNARDI G., BEST P., BIRZAN L., BONAFEDE A., BREITLING F., BRODERICK J., BRUGGEN M., CORSTANJE A., CARBONE D., DE GEUS E., DE VOS M., VAN DUIN A., DUSCHA S., EISLOFFEL J., FALCKE H., FALLOWS R.A., FENDER R., FERRARI C., FRIESWIJK W., GARRETT M.A., GUNST A.W., HAMAKER J.P., HEALD G., HOEFT M., HORANDEL J., JUTTE E., KUPER G., MAAT P., MANN G., MARKOFF S., McFADDEN R., McKAY-BUKOWSKI D., McKEAN J.P., MULCAHY D.D., MUNK H., NELLES A., NORDEN M.J., ORRU E., PAAS H., PANDEY-POMMIER M., PANDEY V.N., PIETKA G., PIZZO R., POLATIDIS A.G., RAFFERTY D., RENTING A., ROTTGERING H., ROWLINSON A., SCAIFE A.M.M., SCHWARZ D., SLUMAN J., SMIRNOV O., STEINMETZ M., STEWART A., SWINBANK J., TAGGER M., TANG Y., TASSE C., THOUDAM S., TORIBIO C., VERMEULEN R., VOCKS C., VAN WEEREN R.J., WIJERS R.A.M.J., WISE M.W., WUCKNITZ O., YATAWATTA S. and ZARKA P.

Abstract (from CDS):

PSR B0823+26, a 0.53-s radio pulsar, displays a host of emission phenomena over time-scales of seconds to (at least) hours, including nulling, subpulse drifting, and mode-changing. Studying pulsars like PSR B0823+26 provides further insight into the relationship between these various emission phenomena and what they might teach us about pulsar magnetospheres. Here we report on the LOFAR (Low-Frequency Array) discovery that PSR B0823+26 has a weak and sporadically emitting `quiet' (Q) emission mode that is over 100 times weaker (on average) and has a nulling fraction forty-times greater than that of the more regularly-emitting `bright' (B) mode. Previously, the pulsar has been undetected in the Q mode, and was assumed to be nulling continuously. PSR B0823+26 shows a further decrease in average flux just before the transition into the B mode, and perhaps truly turns off completely at these times. Furthermore, simultaneous observations taken with the LOFAR, Westerbork, Lovell, and Effelsberg telescopes between 110 MHz and 2.7 GHz demonstrate that the transition between the Q mode and B mode occurs within one single rotation of the neutron star, and that it is concurrent across the range of frequencies observed.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): stars: neutron - pulsars: individual: PSR B0823+26

CDS comments: In chap. 4 : PSR B0834-26 is a misprint for PSR B0826-34.

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
2 PSR B0656+14 Psr 06 59 48.18800 +14 14 19.2000   24.85 24.90     ~ 943 1
3 PSR B0809+74 Psr 08 14 59.500 +74 29 05.70           ~ 425 0
4 PSR B0823+26 Psr 08 26 51.5068 +26 37 21.297           ~ 541 1
5 PSR B0826-34 Psr 08 28 16.6 -34 17 07           ~ 167 0
6 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2446 1
7 PSR B0943+10 Psr 09 46 07.31 +09 51 57.3           ~ 364 1
8 PSR B1133+16 Psr 11 36 03.09460 +15 51 15.9000           ~ 715 0
9 PSR B1822-09 Psr 18 25 30.62000 -09 35 22.0000           ~ 382 0

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