10 iyunya 2007 goda
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Astrofizika rannego obrazovaniya galaktik Bolee glubokii poisk praroditelya sverhnovoi tipa Ic 2002ap Kinematika ul'traslabyh sputnikov Galaktiki: reshenie problemy nedostayushih sputnikov Izobrazhenie poverhnosti Al'taira Chetyre kvazara na krasnyh smesheniyah bol'she 6, otkrytye v kanadsko-francuzskom obzore kvazarov na vysokih krasnyh smesheniyah
Otdel'nye stat'i
Iz razdela physics
Polnyi Arhiv predydushih vypuskov. Arhiv statei, voshedshih v vypuski s 01 iyulya 2002 g. po 31 marta 2003 g.
Arhiv na 14.04.2006
odnim failom
Razdely arhiva (s aprelya 2003 g.): Poleznye astronomicheskie ssylki. Korotkoe esse ob elektronnyh preprintah. Obzornye stat'i v astro-ph 2001-2003 gg.
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Obzory preprintov astro-ph
Vypusk N160
astro-ph za 01 - 08 iyunya 2007 goda: izbrannye stat'i
Referaty otdel'nyh statei
Authors: Piero Madau Comments: 39 pages, to appear in the proceedings of the XVIII Canary Islands Winter School of Astrophysics on "The Emission Line Universe", J. Cepa and F. Sanchez eds., Cambridge University Press V lekcii sobrano bolee-menee vse, chto nuzhno znat' dlya pervogo (no ser'eznogo) znakomstva s formirovaniem krupnomasshtabnoi struktury, formirovaniem i evolyuciei galaktik i pervymi zvezdami. V obzore mnogo poleznyh formul i zavisimostei. V obshem, vse ochen' ser'ezno, dostatochno polno i po delu. Horoshim dopolneniem posluzhit sleduyushii punkt nashei programmy.
Authors: Daniel Schaerer Comments: 48 pages including figures. Lecture notes to appear in "The emission line Universe", XVIII Canary Islands Winter School of Astrophysics, Ed. J. Cepa, Cambridge Univ. Press Eti lekcii posvyasheny pervym galaktikam i zvezdam. Zdes' formul uzhe prakticheski net, zato est' mnogo nablyutel'nyh dannyh i rezul'tatov sravneniya model'nyh raschetov s nablyudeniyami. Tak chto material v samom dele prekrasno dopolnyaet predydushii.
Authors: R. M. Crockett, et al. Comments: 20 pages, 11 figures (resolution of images reduced), 6 tables, submitted for publication in MNRAS Izuchenie sverhnovyh vyshlo na novyi uroven', kogda stalo vozmozhnym iskat' zvezdy-praroditeli na arhivnyh snimkah. Pravda, primery, kogda praroditel' byl identificirovan, mozhno pereschitat' po pal'cam. V obsuzhdaemoi stat'e praroditel' ne naiden, no postavleny ochen' vazhnye verhnie predely, krome togo, rech' idet o sverhnovyh tipa Ic.
Verhnii predel govorit o tom, chto praroditelem mogla byt' tol'ko zvezda
Vol'fa-Raie. Prichem, esli eto byla odinochnaya zvezda, to ona dolzhna byla by
imet' ochen' bol'shoi temp poteri massy, bol'she standartnogo. Znachit,
veroyatnee vsego, zvezda-praroditel' vhodila v dvoinuyu sistemu.
Sootvetstvenno, mozhno posmotret' ne viden li seichas vtoroi komponent. Ne
viden. Znachit, mozhno dat' ogranichenie na ego massu, esli eto normal'naya
zvezda (razumeetsya, kompan'on mozhet byt' kompaktnym ob'ektom).
Authors: Joshua D. Simon, Marla Geha Comments: 21 pages, 15 figures (12 in color), 6 tables. Submitted to ApJ Kak izvestno, sushestvuet t.n. "problema nedostayushih sputnikov". Chislennoe modelirovanie formirovaniya galaktik v modeli ierarhicheskogo skuchivaniya predskazyvaet, chto u nashei Galaktiki dolzhno byt' gorazdo bol'she slabyh sputnikov, chem nablyudaetsya. Problema dovol'no ser'eznaya, i aktivno obsuzhdaetsya. Takzhe izvestno, chto v poslednee vremya (vo mnogom blagodarya Sloanovskomu obzoru - SDSS) otkryvayut mnogo karlikovyh galaktikov - sputnikov Mlechnogo Puti. Avtory detal'no issleduyut vosem' nedavno otkrytyh sputnikov i pytayutsya ponyat', mozhno li tut kak-to reshit' problemu nehvatki karlikovyh galaktik. Razumeetsya, novye otkrytiya sushestvenno smyagchayut problemu, no ne reshayut ee polnost'yu Sputnikov vse ravno ne hvataet, i nuzhny dopolnitel'nye predpolozheniya. Avtory pokazyvayut, chto naibolee effektivnoi budet gipoteza o tom, chto lish' dostatochno massivnye galo temnoi materii (a vse galaktiki, vklyuchaya i karlikovye sputniki, eto v osnovnom temnaya materiya, v ne obychnoe veshestvo) sposobny formirovt' zvezdy. Prichem, nabrat' etu kriticheskuyu massu nado bylo do epohi reionizacii. Esli eto udaetsya, to v nastoyashii moment my uvidim takoi ob'ekt kak galaktiku, esli zhe net, to budet lish' temnoe galo, uskol'zayushee ot nashih nablyudenii.
Authors: G. Galletta, et al. Comments: 4 pages, 3 figures. Mem. SAIt, in press LISA - Laboratorio Italiano di Simulazione Ambiente (Ital'yanskaya laboratoriya dlya modelirovaniya okruzhayushei sredy, sm. opisanie proekta na ital'yanskom yazyke). Proekt realizovan v Padue. Eksperiment pozvolyaet modelirovat' usloviya ot normal'nyh dlya cheloveka do marsianskih. Imenno marsianskoi chasti proekta i posvyashena korotkaya zametka. Bylo provedeno neskol'ko "progonov", v kotoryh spory i bakterii podvergalis' "vnezemnym" mucheniyam v usloviyah, pohozhih na marsianskie. Cel'yu bylo proverit' vyzhivut ili net. Koe-kakie obrazcy vyzhivali.
Obsudit' v ZhZh-soobshestve
ru_astroph.
Authors: Matt Visser Comments: 37 pages, 1 figure: This is a draft of an introductory chapter on the Kerr spacetime that is intended for use in the book "The Kerr spacetime", currently being edited by Susan Scott, Matt Visser, and David Wiltshire. Na samom dele, ne takoe uzh kratkoe, i sovsem ne prostoe vvedenie v kerrovskuyu metriku. Hotya prostota sostoit, pozhalui, v tom, chto vypisany mnogie formuly, bez kotoryh potom sovsem nel'zya vlezat' v detali (detali - v knige, mozhet byt' i ona poyavitsya v svoe vremya v seti).
Authors: John D. Monnnier et al. Comments: 24 pages. to appear in Science. includes Report and Supplemental Online Materials. Accompanying animation can be found at this http URL Vot i poyavilsya polnyi tekst raboty, o kotoroi tak mnogo pisali v SMI. S pomosh'yu interferometra, rabotayushego v blizhnem IK diapazone, udalos' poluchit' neplohie izobrazheniya al'fa Orla. Uglovoe razreshenie luchshe odnoi tysyachnoi sekundy dugi (v itoge chto-to okolo odnoi desyatimillionnoi gradusa, ili, esli ugodno, odnoi milliardnoi dugi, nemnogo okruglyaya). Razumeetsya, dlya ob'yasneniya bolee detal'nyh dannyh nuzhny i bolee detal'nye zvezdnye modeli. Teoretiki berutsya za rabotu.
Authors: Jeremy S. Heyl Comments: 4 pages, 3 figures, submitted to MNRAS Letters Na stadii asimptoticheskoi vetvi gigantov zvezdnyi veter mozhet byt' sil'nym i sushestvenno asimmetrichnym. Itogo mozhet stat' razgon ostayushegosya zvezdnogo yadra - budushego belogo karlika. V nekotorom smysle mozhno skazat', chto kak i neitronnye zvezdy, belye karliki pri svoem rozhdenii poluchayut kik (kick - udar, tolchok). Konechno, sbros obolochki gigantom - eto ne vzryv sverhnovyh, poetomu kik u belyh karlikov ne mozhet dostigat' tysyach km/s, kak u neitronnyh zvezd. Tem ne menee, mogut byt' nablyudatel'nye effekty, svyazannye s raspredeleniem belyh karlikov v sharovyh skopleniyah. Vo-pervyh, chast' belyh karlikov mozhet prosto vyletat' iz skoplenii, t.e. budet nablyudat'sya ih deficit. Vo-vtoryh, molodye karliki (kotorye eshe ne uspeli vyletet') budut menee koncentrirovany k centru skopleniya. Poslednee - nablyudaetsya. T.o., polagaet Dzheremi Heil, raspredelenie molodyh belyh karlikov v sharovyh skopleniyah mozhet posluzhit' unikal'nym instrumentom dlya izucheniya poteri massy na asimptoticheskoi vetvi gigantov i vo vremya formirovaniya planetarnyh tumannostei. Sm. takzhe arxiv:0706.0912. V etoi stat'e Heil rassmatrivaet vozdeistvie kika belyh karlikov na ih zhizn' v tesnoi dvoinoi sisteme.
Authors: A.K.H. Kong et al. Comments: 10 pages, 8 figures. Submitted to ApJ Po dannym nablyudenii na Chandre v central'noi oblasti izvestnoi blizkoi galaktiki s moshnym zvezdoobrazovaniem M82 otkryt tranzientnyi ul'tramoshnyi istochnik (audiofail s zapis'yu nauchno-populyarnoi programmy, v kotoroi shla rech' ob etih ob'ektah, mozhno naiti zdes'). Raspolozhen ob'ekt v molodom zvezdnom skoplenii. Avtory polagayut, chto my imeem delo s chernoi dyroi promezhutochnoi massy (bolee 100 solnechnyh).
Authors: Chris J. Willott, et al. Comments: 14 pages, 9 figures, submitted to AJ Predstavleny svezheotkrytye dalekie kvazary. Sredi nih - samyi dalekii na segodnyashnii den': CFHQS J2329-0301. On nahoditsya na krasnom smeshenii z=6.43 (napomnyu, chto perevod krasnyh smeshenii v rasstoyaniya ili vremya ot bol'shogo vzryva yavlyaetsya model'no zavisimoi proceduroi). Sm. takzhe novost' na Granyah.
Authors: Joseph D. Gelfand, B. M. Gaensler Comments: 11 pages, 5 figures, ApJ accepted Avtory predstavlyayut rezul'taty nablyudenii v raznyh diapazonah istochnika 1E 1547.0-5408. Po mneniyu avtorov, my imeem delo s magnitarom, k tomu zhe, vo vsei vidimosti, nahodyashimsya v ostatke sverhnovoi. Tak eto ili net na samom dele pokazhut dal'neishie issledovaniya.
My budem starat'sya hotya by perechislit' interesnye (dlya shirokoi publiki) stat'i, poyavivshiesya v razdele physics (vklyuchaya cross-listing).
Authors: Silvio R. Dahmen Comments: 15 pages, no figures
Pochemu lyudi ne letayut kak pticy
Posle nebol'shogo razbega avtor rasskazyvaet ob entuziazme Bol'cmana v oblasti vozduhoplavaniya. Opisyvayutsya lekcii Bol'cmana, posyashennye dannoi probleme, ego lichnye kontakty i, v chastnosti, perepiska s entuziastami poletov na apparatah tyazhelee vozduha.
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