Albert KongIns$tute of Astronomy
Na$onal Tsing Hua University, Taiwan
Phyllis Yen, Ruolan Jin, Ray Li, Thomas Tam, David Hui, K. S. Cheng, Jumpei Takata, and Fermi Asian Network (FAN)
Discovery of an Ultra-Compact Gamma-ray Millisecond Pulsar Binary Candidate
5th International Fermi Symposium Nagoya University, Japan 20-24, October, 2014
Millisecond Pulsars (MSPs)• Very rapid rotating
neutron star
• Majority are in binaries
• Some are isolated systems
• MSPs are detected in the radio, X-ray, gamma-ray, and OIR
• MSP begins its life as a normal pulsar and is spun up via accretion from its companion
Black Widow MSPs
• Some MSP binaries have an orbital period of < 1day
• Pulsar radia$on can ablate the companion, leaving an isolated MSP at the end
Biology Lettersvolum
e 1 .num
ber 3 .pages 253 –380 .
22 September 2005
ISSN 1744-9561
volume 1
number 3
pages 253–380
’
22 September 2005volume 1 . number 3 . pages 253–380
253 Image content influences men’s semen qualityS. J. Kilgallon & L. W. Simmons
256 Women’s preference for dominant male odour: effectsof menstrual cycle and relationship statusJ. Havlicek, S. C. Roberts & J. Flegr
260 Genetic influences on variation in female orgasmicfunction: a twin studyK. M. Dunn, L. F. Cherkas & T. D. Spector
264 The multiple signals assessed by female satinbowerbirds: could they be used to narrow downfemales' choices of mates?T. E. Robson, A. W. Goldizen & D. J. Green
268 Reversible switches between male–male andmale–female mating behaviour by male damselfliesH. Van Gossum, L. De Bruyn & R. Stoks
271 Terminal reproductive effort in a marsupialJ. L. Isaac & C. N. Johnson
276 Novel male trait prolongs survival in suicidal matingM. C. B. Andrade, L. Gu & J. A. Stoltz
280 A Romani mitochondrial haplotype in England 500years before their recorded arrival in BritainA. L. Töpf & A. R. Hoelzel
283 Bigger is not always better: when brains get smallerK. Safi, M. A. Seid & D. K. N. Dechmann
287 A cryptic taxon of Galápagos tortoise inconservation perilM. A. Russello, S. Glaberman, J. P. Gibbs, C. Marquez,J. R. Powell & A. Caccone
291 A rapid loss of stripes: the evolutionary history of theextinct quaggaJ. A. Leonard, N. Rohland, S. Glaberman, R. C. Fleischer,A. Caccone & M. Hofreiter
296 Avian collision risk at an offshore wind farmM. Desholm & J. Kahlert
299 Spider signals: are web decorations visible to birdsand bees?M. J. Bruce, A. M. Heiling & M. E. Herberstein
303 Sensitivity to dimethyl sulphide suggests a mechanismfor olfactory navigation by seabirdsG. A. Nevitt & F. Bonadonna
306 Ultraviolet vision and foraging in dip and plungediving birdsO. Håstad, E. Ernstdotter & A. Ödeen
310 Ultraviolet reflecting photonic microstructures in theKing Penguin beakB. Dresp, P. Jouventin & K. Langley
314 Spatial encoding in mountain chickadees: featuresovershadow geometryE. R. Gray, L. L. Bloomfield, A. Ferrey, M. L. Spetch &C. B. Sturdy
318 No sex difference in yolk steroid concentrations ofavian eggs at layingK. M. Pilz, E. Adkins-Regan & H. Schwabl
322 Livestock grazing affects the egg size of aninsectivorous passerineD. M. Evans, S. M. Redpath, S. A. Evans, D. A. Elston &P. Dennis
326 Genetic diversity predicts pathogen resistanceand cell-mediated immunocompetence in housefinchesD. M. Hawley, K. V. Sydenstricker, G. V. Kollias &A. A. Dhondt
330 Continental variation in relative hippocampal volumein birds: the phylogenetic extent of the effect and thepotential role of winter temperaturesL. Z. Garamszegi & J. R. Lucas
334 Feathers at nests are potential female signals in thespotless starlingJ. P. Veiga & V. Polo
338 Why not walk faster?J. R. Usherwood
342 Modulation of passive force in single skeletalmuscle fibresD. E. Rassier, E.-J. Lee & W. Herzog
346 Do insect metabolic rates at rest and during flightscale with body mass?J. E. Niven & J. P. W. Scharlemann
350 Epidemiological implications of the contact network structure for cattle farms and the 20–80 ruleM. E. J. Woolhouse, D. J. Shaw, L. Matthews, W.-C. Liu,D. J. Mellor & M. R. Thomas
353 Different hunting strategies select for differentweights in red deerM. Martínez, C. Rodríguez-Vigal, O. R. Jones, T. Coulson &A. San Miguel
357 Eating without hands or tongue: specialization,elaboration and the evolution of prey processingmechanisms in cartilaginous fishesM. N. Dean, C. D. Wilga & A. P. Summers
362 Effects of Hurricane Charley on fish chorusingJ. V. Locascio & D. A. Mann
366 Extreme spatial variability in marine picoplanktonand its consequences for interpreting Euleriantime-seriesA. P. Martin, M. V. Zubkov, P. H. Burkill & R. J. Holland
370 Habitat selection determines abundance, richnessand species composition of beetles in aquaticcommunitiesC. A. Binckley & W. J. Resetarits Jr
375 Costly parasite resistance: a genotype-dependenthandicap in sand lizards?M. Olsson, E. Wapstra, T. Madsen, B. Ujvari & C. Rugfelt
378 Differential sex allocation in sand lizards: bright malesinduce daughter production in a species withheteromorphic sex chromosomesM. Olsson, E. Wapstra & T. Uller
22 September 2005www.journals.royalsoc.ac.ukPublished in Great Britain by The Royal Society, 6–9 Carlton House Terrace, London SW1Y 5AG
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Black Widow MSPs
• Companion can either be a less massive (< 0.05 M⊙) degenerate object (black-‐widow) or a late-‐type star (redback)
• BW/RB MSPs are the missing link between LMXBs and isolated MSPs
• Because of the pulsar’s hea$ng on the companion, the op$cal emission from the companion can be changed by more than 2 magnitudes in an orbital cycle
• Tradi$onally, MSPs are discovered via radio $ming
• Radio $ming at the Fermi’s gamma-‐ray posi$ons
• Blind search of gamma-‐ray pulsa$on is now possible with Fermi; it is however very hard for MSPs (Pletsch+ 2012, Science) and op$cal data are required
• MSPs can be ``radio-‐quiet’’ that have not been seen yet
• No radio => Need X-‐ray/gamma-‐ray data
• Too many X-‐ray sources and many different classes of sources
• Gamma-‐ray data are more ``simple’’
How can we search for BW/RB MSPs?
Selec$ng MSP candidates in the Fermi catalog
• Steady (variability index)
•Non power-‐law source (curvature index)
•High Galac$c la$tude
•No reported radio emission
•Archival X-‐ray imaging data (compare gamma-‐ray and X-‐ray, and hopefully mul$-‐wavelength follow-‐up)
Mul%-‐wavelength campaign for searching “radio-‐quiet” MSPs
• Select suitable uniden$fied Fermi objects (UFOs) for follow-‐up X-‐ray and op$cal observa$ons
• Swib/Chandra/XMM observa$ons can iden$fy possible counterparts; no radio counterparts
• Iden$fy the op$cal counterpart and look for op$cal variability due to the orbital modula$on
UFO as a ``radio-‐quiet’’ gamma-‐ray emicng MSP in a binary? 1FGL J2339.7-‐0531
FermiOp$cal/X-‐ray @4.6hr
Kong+ 2012
JVLA Con$nuum Observa$on of the RB MSP 1FGL J2339.7-‐0531
63 μJy
1FGL J1653.6-0158: a “radio-quiet” ultra-compact MSP?
• Steady gamma-ray source
• Exponential cutoff power-law spectrum
• X-ray/gamma-ray flux ratio: ~0.5% (typical of MSPs)
• No pulsation from GBT (Ransom+ 2011) and Effelsberg (Barr+ 2013)
• The brightest X-ray source within the Fermi error circle has an optical counterpart (R~20)
• Preliminary study was performed with the 1m telescope at Lulin Observatory in Taiwan
• Variability on timescale of 1 hour is seen
• We performed a time-series observation with the 2.5m INT at La Palma in 2014 June.
1FGL J1653.6-0158: a “radio-quiet” ultra-compact MSP?
1FGL J1653.6-0158: a “radio-quiet” ultra-compact MSP?
1FGL J1653.6-0158: a “radio-quiet” ultra-compact MSP?
Chandra
Kong+ 2014
r’ band
g’ band
g’-r’
Chandra
Pb=75 min
• Accreting millisecond X-ray pulsars (AMXPs) have been found with ultra-compact (< 80 min) binary periods
• An ultra-compact binary consists of a compact object and a degenerate or partially degenerate companion
• Ultra-compact binaries are important sources for gravitational waves
• It should be natural to have an ultra-compact rotation-powered MSP when the accretion of an ultra-compact AMXP stops
• 1FGL J1653.6-0158 could be the first example of an ultra-compact MSP
Ultra-compact MSP: A Missing Black Widow
• Optical spectroscopy shows that 1FGL J1653.6-0158 is hydrogen poor (Romani+ 2014) => more likely a black widow instead of a redback
• Pulsation search (radio, gamma-ray, and X-ray) will be the ultimate test
• An accurate optical orbital period will be crucial
• JVLA proposal was proposed to confirm if it is truly “radio-quiet”
• XMM and NuSTAR observations to obtain a better X-ray lightcurve and phase-resolved spectroscopy were proposed
• We are looking forward to the 3FGL catalog (>300 new UFOs)
Ultra-compact MSP: A Missing Black Widow