Quelques observations de LOFAR : a. Sursauts radio dans la

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Quelques! observations! de! LOFAR!:! a.! Sursauts! radio! dans! la! couronne! solaire! à! 30! MHz.! b.! Émission! des! ceintures! de!
radiations!de!Jupiter!à!150!MHz.!c.!Nébuleuse!du!crabe! à! 250! MHz.!d.!Découverte!de!2!nouveaux!pulsars.!e.!Directions!
d’arrivée!des!rayons!cosmiques!dans!l’atmosphère!terrestre.!f.!Cartographie!du!ciel!à!~30!MHz.!g.!La!galaxie!M87!(Virgo!A)!
à! 140! MHz.! h.! Découverte! d’une! radiogalaxie! géante.! i.! Champs! magnétiques! galactiques.! j.! Schéma! de! l’époque! de!
"réionisation"!(allumage!des!premières!étoiles!et!galaxies).!
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0.106 0.11 0.117 0.132 0.163 0.223 0.344 0.583 1.07 2.02 3.93
3C196 LBA 30 - 34 MHz, noise 28-37 mJy/beam, 80 arcsec resolution
Ascension droite
Déclinaison
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Quelques!observations!de!LOFAR!:!!
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a.!Sursauts!radio!dans!la!couronne!solaire!à!30[35!MHz.!!
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"#! $%&'! (#! ")*+,! -(#! ./! 01! (#! (23145'#6! 725&8! 3&! 9:'(! (#7! ;3<7=>37?! 3! 2$2! 858! &52@278! #A! 1:(#! 1&@52=B327$#3&C!D! E/F!
B327$#3&C!721&@53A87!G3H#A5!&A!$I31G!(#!H&#!(#!JKJL!$#A5'8!7&'!@#!M:@#2@!N!@#7!B327$#3&C!7:A5!(2753A57!(#&C!O!(#&C!(#!EPQ6!#5!
@#&'!(23145'#!O!JR!STU!#75!/EQK!"Q3H3A53V#!(#!$#!1:(#!7&'!@Q213V#'2#!$@3772W&#!-W&2!G':(&25!E!213V#!G3'!7#$:A(#?!#75!W&#!@#!
72VA3@!(3A7!$I3W&#!B327$#3&!#75!#A'#V275'8!O!&A!'<5I1#!5'47!'3G2(#!-XJ!17#$!G3'!7G#$5'#6!3H#$!E/KY!0TU!(#!'87:@&52:A?K!Z#$2!
G#'1#5!(#!7&2H'#!@Q#CG3A72:A!'3G2(#!(#7!7&'73&57!'3(2:!(3A7!@3!$:&':AA#!7:@32'#K!"3!B2V&'#! (:A5!#75!#C5'325#!@Q213V#!-3?! #75!
'#G':(&25#!$2=(#77&7K!"#7!J!G3AA#3&C!7&G8'2#&'7!1:A5'#A5!@Q213V#!(&!7&'73&5!(3A7!J![3A(#7!(#!B'8W&#A$#7!(8$':2773A5#7!-(#!
V3&$I#!O!(':25#?K!"Q3A3@<7#!(&!72VA3@!5#1G7=B'8W&#A$#!O!I3&5#!'87:@&52:A!(3A7!/!(#7!E/F!B327$#3&C!#75!(8532@@8#!(3A7!@#7!/!
G3AA#3&C!(&![37!-O!V3&$I#!@#!B327$#3&!9LP6!7<1[:@278!G3'!&A!5'23AV@#!7&'!@#7!213V#76!O!(':25#!@#!B327$#3&!9L/P!7<1[:@278!G3'!
&A! $3''8?K! "Q2A753A5! :\! 7:A5! G'27#7! @#7! 213V#7! #75! 2A(2W&8! G3'! @3! @2VA#! #A! 52'#576! 1:A5'3A5! W&Q2@! 7Q3V25! (Q&A#! ]!7:&'$#!^!
7Q8@:2VA3A5! (&! M:@#2@! O! V'3A(#! H25#77#! #5! 81#553A5! O! (#7! B'8W&#A$#7! (#! G@&7! #A! G@&7! [377#7K! Z#55#! 7:&'$#! #75! &A! B327$#3&!
(Q8@#$5':A7!3$$8@8'87!(3A7!@3!$:&':AA#!O!&A#!H25#77#!#A5'#!@#!52#'7!#5!@3!1:2528!(#!@3!H25#77#!(#!@3!@&124'#!_!`A!5'3H#'73A5!@3!
$:&':AA#6!$#!B327$#3&!#C$25#!@#!12@2#&!31[23A5!O!&A#!B'8W&#A$#!G':G:'52:AA#@@#!O!@3!(#A7258!(#!$#!12@2#&6!W&2!(8$':a5!3H#$!@3!
(2753A$#!3&!M:@#2@K!Z#7!:[7#'H352:A7!#C5'b1#1#A5!'2$I#7!G#'1#55#A5!(Q85&(2#'!@3!(275'2[&52:A!(#!(#A7258!(3A7!@3!$:&':AA#!#5!
@#!1:(#!(Q3$$8@8'352:A!5'47!#BB2$3$#!(#!$#7!B327$#3&CK!!
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b.!Émission!des!ceintures!de!radiations!de!Jupiter!à!150!MHz.!
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"3!13VA85:7GI4'#!(#!c&G25#'!#75!&A!3$$8@8'35#&'!(#!G3'52$&@#7!V83A5!W&2!G:'5#!@#7!8@#$5':A7!O!&A#!8A#'V2#!(#!$#A532A#7!(#!
0#d!O!G@&72#&'7!S#dK!Z#7!G3'52$&@#7!7:A5!G28V8#7!(3A7!@3!G3'52#!2A5#'A#!(#!@3!13VA85:7GI4'#!(#!c&G25#'6!(3A7!@#7!]!$#2A5&'#7!
(#! '3(2352:A7!^! -$#! A:1! #75! #A! B325! 21G':G'#! G&27W&Q2@! 7Q3V25! (#! G3'52$&@#7! 8A#'V852W&#7?6! #5! 81#55#A5! &A! '3<:AA#1#A5!
7<A$I':5':AK!")*+,!3!'83@278!@#7!$3'5#7!(#!G@&7![377#7!B'8W&#A$#7!(#!$#!'3<:AA#1#A5K!Z#7![377#7!B'8W&#A$#7!7:A5!8127#7!G3'!
@#7! 8@#$5':A7! (#! G@&7! [377#! 8A#'V2#! (3A7! @3! V311#! $2=(#77&7! -$#A532A#7! (#! 0#d?!:&! (3A7! @#7! '8V2:A7! (#! G@&7! B32[@#! $I31G!
13VA852W&#!-@:2A!(#!@3!G@3A45#?K!"Q213V#!-[?!#75!@3!H#'72:A!G'8@212A32'#!(:A5! @3!H#'72:A!B2A3@#! #75!$2=(#77&7K! +! V3&$I#! 7:A5!
7&G#'G:78#7! (#7! @2VA#7! (#! $I31G! (2G:@32'#! c:H2#A6! #5! O! (':25#! @#7! $:A5:&'7! (Q2A5#A7258! :[5#A&7! O! Y! eTUK! "#! '3<:AA#1#A5!
7<A$I':5':A! [377#! B'8W&#A$#! (85#$58! G3'! ")*+,! 7Q85#A(! G@&7! @:2A! W&#! 73! $:A5'#G3'52#! O! Y! eTU6! f&7W&QO! P! '3<:A7! c:H2#A7!
-.JRRRRR! 01?! (&! $#A5'#! (#! c&G25#'K! "3! $:1G3'327:A! O! (#7! 721&@352:A7! GI<72W&#7! (8H#@:GG8#7! O! @Q)9`,+! g:&@:&7#!-$:(#!
M3@311[h=Ji6! 213V#! (&! [37?! G#'1#5! (#! 52'#'! (#7! 2AB:'1352:A7! 7&'!$#7! G:G&@352:A7! 8@#$5':A2W&#7!#5! @#&'7! H3'2352:A7! (3A7!
@Q#7G3$#!#5!@#!5#1G7K!
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c.!Nébuleuse!du!crabe!à!250!MHz.!!
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"3! A8[&@#&7#! (&! Z'3[#! '87&@5#! (#! @Q#CG@:72:A! (Q&A#! 85:2@#! 13772H#6! :[7#'H8#! 3&! 753(#! (#!7&G#'A:H3! #A! @Q3A! ERYPK! `A! 7:A!
$#A5'#!7#!5':&H#!@#!G&@73'!(&!Z'3[#!W&2!#BB#$5&#!&A!5:&'!7&'!@&2!1b1#!#A!JJ!17#$K!M&'!@Q213V#!(#!V3&$I#6!@3!A8[&@#&7#!#75!
213V8#! O! Y! eTU! 3H#$! @#! d"+!-3&! 9:&H#3&! S#C2W&#6! jM+6! W&2! G#&5! B:'1#'! (#7! [37#7! (#! /Y! 01?K! "Q213V#! (#! (':25#! 3! 858!
:[5#A&#! 3H#$! ")*+,! O! /YR! STUK! ;:&'! &A#! 1b1#! (21#A72:A! (Q2A5#'B8':145'#6! @3! B2A#77#! (#7! (8532@7! 3&V1#A5#! 3H#$! @3!
B'8W&#A$#K! "Q213V#! (#! (':25#6! G:&'53A5! :[5#A&#! O! &A#! B'8W&#A$#! /R! B:27! G@&7! B32[@#6!(:25! 73! [:AA#! (8B2A252:A! -W&#@W&#7!
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2A5#'A352:A3@#7!`&':G8#AA#7!-A:A!5:&5#7!G'27#7!#A!$:1G5#!2$2?K!;:&'!:[5#A2'!&A#!213V#!G'8$27#6!@Q3&5#&'!-)K!l&$0A25U6!/REE?!
3!853@:AA8!@#7!(:AA8#7!['&5#7!#A! G'#A3A5!G:&'!'8B8'#A$#!@#!G&@73'!$#A5'3@6!:[f#5!G:A$5&#@!['2@@3A5!W&2!A#! G&@7#!G@&7!O!/YR!
STU!$3'!@Q853@#1#A5!(#7!21G&@72:A7!#75!7&G8'2#&'!O!@#&'!G8'2:(#K!
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d.!Découverte!de!2!nouveaux!pulsars.!!
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85:2@#!13772H#K!"#&'!':5352:A!#75!'3G2(#! -E! 17#$!O!E!7#$?!#5!@#&'!$I31G!13VA852W&#!5'47!2A5#A7#K!i#7!B327$#3&C!'3(2:! 7:A5!
G':(&257!(3A7!@3!(2'#$52:A!(#!@Q3C#!13VA852W&#!W&2!G'8$#77#!V8A8'3@#1#A5!3&5:&'!(#!@Q3C#!(#!':5352:AK!M2!&A!(#7!B327$#3&C!
[3@32#!@3!g#''#!O!$I3W&#!5:&'6!:A!:[7#'H#!&A#!21G&@72:A!G3'!5:&'6!#5!@Q375'#!#75!W&3@2B28!(#!G&@73'K!"Q85&(#!(#7!G&@73'7!#75!5'47!
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