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Soderzhanie i bystryi perehod k razdelam obzora
Yarkaya opticheskaya vspyshka GRB 060117 Rasstoyaniya do anomal'nyh rentgenovskih pul'sarov, opredelennye po krasnym zvezdam Teleskop Dzheimsa Vebba Yavlyaetsya li pul'sar B0656+14 ochen' blizkim RRAT?
Otdel'nye stat'i
Polnyi Arhiv predydushih vypuskov. Arhiv statei, voshedshih v vypuski s 01 iyulya 2002 g. po 31 marta 2003 g.
Arhiv na 14.04.2006
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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 N136
astro-ph za 01 iyunya - 15 iyunya 2006 goda: izbrannye stat'i
Referaty otdel'nyh statei
Authors: Martin Jelnek et al. Comments: Accepted to A&A, 4 pages Okazyvaetsya observatoriya imeni P'era Ozhe, prednaznachennaya dlya izucheniya kosmicheskih luchei, mozhet davat' interesnye pobochnye rezul'taty (voobshe, eto yavlyaetsya svoistvom kazhdogo horoshego krupnogo proekta). S pomosh'yu shirokougol'noi avtomaticheskoi kamery obnaruzheno opticheskoe izluchenie odnogo iz gamma-vspleskov. Na korotkoe vremya blesk dostig 10-i zvezdnoi velichiny. Cushestvenno, chto bolee pozdnie nablyudeniya dannogo istochnika v optike dali lish' verhnie predely. Eto govorit ob ochen' bystrom spadanii bleska. Prichiny takogo povedeniya vspleska poka ne yasny, no avtory privodyat nekotorye rassuzhdeniya na etu temu.
Authors: Kouichi Hirotani Comments: 16 pages, 9 figures, Mod. Phys. Lett. A in press Neplohoi obzor po magnitosfernomu izlucheniyu pul'sarov v diapazone rentgenovskih i gamma-luchei. Seichas v preddverii zapuskov sputnikov AGILE i GLAST eto vse ves'ma aktual'no.
Authors: Martin Durant, Marten H. van Kerkwijk Comments: 38 pages aastex, 10 figures. Accepted for publication in ApJ Zagolovok, kak vy obratili vnimanie, pereveden ne vpolne tochno, t.k. ya prosto ne znayu ustoyavshegosya russkogo termina dlya red clump stars, a predlozhenie svoego varianta - delo dovol'no otvetstvennoe i trebuet razdumiya. Itak ... Izmerenie rasstoyanii do anomal'nyh rentgenovskih pul'sarov (ARP) yavlyaetsya ochen' neprostym delom. Neprostym, no vazhnym. Avtory ispol'zovali infrakrasnye dannnye po zvezdam, nablyudayushimsya v napravleniyah na izvestnye ARP. Vmeste s dannymi o pogloshenii v rentgenovskom diapazone, poluchaemymi nepostredstvenno iz nablyudenii ARP, eta informaciya pozvolila avtoram utochnit' rasstoyaniya do ARP. Vo-pervyh, podtverzhdeno, chto ARP nahodyatsya v spiral'nyh rukavah. Eto horosho, no eshe ne supervazhno. Vo-vtoryh, i eto uzhe teplee, svetimosti ARP okazalis' ochen' blizkimi - poryadka 10 v 35 stepeni erg za sekundu. Nakonec, i eto samoe vazhnoe, obnaruzhena ochen' horoshaya antikorrelyaciya radiusa chernotel'no izluchayushei oblasti ("goryachego pyatna") s dolei pul'siruyushego izlucheniya. Takzhe vidna nekotoraya antikorrelyaciya radiusa goryachego pyatna s temperaturoi. Vse eto ochen' vazhno dlya postroeniya modeli ARP, kotoraya poka taki otsutstvuet.
Authors: K. Kinemuchi et al. Comments: 68 pages, 26 figures, 9 tables, accepted to AJ ROTSE (Robotic Optical Transient Search Experiment) - eto nebol'shoi obzornyi instrument, iznachal'no prednaznachennyi dlya poiska opticheskih tranzientov, svyazannyh s gamma-vspleskami. No vspleski, soprovozhdayushiesya dostatochno yarkoi opticheskoi vspyshkoi sluchayutsya nechasto, a obzory neba vedutsya postoyanno. Znachit, nado ispol'zovat' vsyu tu informaciyu, kotoraya "sama soboi" nakaplivaetsya. V dannoi stat'e avtory predstavlyayut analiz obzora peremennyh zvezd tipa RR Liry yarche 14-i zvezdnoi velichiny. Vsego vydeleno 1197 kandidatov. Dlya 1188 postroeny horoshie krivye bleska. Dlya 589 udalos' dazhe poluchit' dannye po metallichnosti.
Authors: L. Jeremy Richardson, Joseph Harrington, Sara Seager, Drake Deming Comments: 18 pages, 3 figures, Accepted to Astrophysical Journal Po krivoi bleska na dline volny 24 mikrona opredelen radius odnoi iz tranzitnyh ekzoplanet. On okazalsya ravnym 1.26 +/- 0.08 radiusa Yupitera. Eta ocenka v predelah oshibok sovpadaet s rezul'tatom, poluchennym ranee v opticheskom diapazone.
Authors: Milan M. Cirkovic Comments: Contribution to "Macro-Engineering: A Challenge for the Future" ed. by Viorel Badescu, Richard B. Cathcart, and Roelof D. Schuiling, in press Obsuzhdaetsya problema obnaruzheniya inzhenernoi deyatel'nosti prodvinutyh vnezemnyh civilizacii. Avtor polagaet, chto sovremennye proekty SETI ploho prisposobleny dlya poiska sledov takoi deyatel'nosti, a iskat' nado imenno ih, a ne "signaly".
Authors: Philip M. Hinz, A. N. Heinze, Suresh Sivanandam, Douglas L. Miller, Matthew A. Kenworthy, Guido Brusa, Melanie Freed, J.R.P. Angel Comments: accepted to ApJ June 6, 2006 Po strukture raspredeleniya pyli vokrug Vegi bylo zapodozreno, chto zvezda mozhet imet' massivnuyu planetu na shirokoi orbite. Avtory proveli detal'nye nablyudeniya v infrakrasnom diapazone s pomosh'yu ustanovki MMT. I m udalos' postavit' ochen' ser'eznoe ogranichenie na parametry planety. Massa ee dolzhna byt' ne bolee 7 mass Yupitera, esli ee orbita bol'she 20 a.e. V drugoi stat'e opisyvaetsya kamera Clio, prednaznachennaya dlya poiska planet i rabotayushaya na toi zhe ustanovke MMT.
Authors: Oleg Y. Gnedin, Jose L. Prieto Comments: 8 pages, invited review for conference "Globular Clusters, Guide to Galaxies", 6-10 March 2006, University of Concepcion, Chile, ed. T. Richtler, et al Rassmotren mehanizm obrazovaniya sharovyh skoplenii v standartnoi kartine ierarhicheskogo skuchivaniya. Dlya etogo provedeno chislennoe modelirovanie: ot samyh rannih etapov formirovaniya galaktik do sovremennogo ih sostoyaniya. Pokazano, chto v samom dele, sharovye skopleniya mogut obrazovyvat'sya iz gigantskih molekulyarnyh oblakov, kotorye uspevayut poyavit'sya na dostatochno bol'shih krasnyh smesheniyah. Dal'neishaya evolyuciya skoplenii (i vsei sistemy galaktik) privodit k kartine dostatochno horosho sovpadayushei s nablyudaemoi. Dalekie sharovye skopleniya (dal'she 10 kpk ot centra galaktiki) rodilis' kogda-to v bolee melkih galaktikah-sputnikah, kotorye k nastoyashemu momentu uzhe razrusheny.
Authors: Jonathan P. Gardner et al. Comments: 96 pages, including 48 figures and 15 tables, accepted by Space Science Reviews Polnoe opisanie budushego kosmicheskogo teleskopa. Eto budet infrakrasnyi instrument s pochti 7-metrovym (raskladyvayushimsya) zerkalom. On dolzhen priiti na smenu habblovskomu teleskopu (KTH). Nauchnye zadachi novogo instrumenta formuliruyutsya pochti kak Life, Universe and everything: eto i "konec temnyh vremen", t.e. obrazovanie pervyh svetyashihsya ob'ektov vo vselennoi, i formirovanie pervyh galaktik, i rozhdenie uzhe obychnyh (sovremennyh nam) zvezd i planetnyh sistem, i, nakonec, issledovanie ekzoplanet i proishozhdeniya zhizni.
Authors: Igor V. Igumenshchev Comments: 31 pages, 7 figures attached in jpg-format; to appear in ApJ Teoriya akkrecii razvivaetsya uzhe dostatochno davno. Tem ne menee, dazhe dlya dostatochno prostyh techenii ne dostignuto polnoe ponimanie. Kak yasno iz nazvaniya stat'i, v nei providitsya chislennoe issledovanie trehmernoi sfericheski-simmetrichnoi akkrecii s uchetom magnitnyh polei. Kak i v bolee rannih issledovaniyah (v tom chisle i samogo avtora stat'i) temp akkrecii konechno zhe men'she, chem v sluchae klassicheskoi akkrecii Bondi. Vazhnym novym vyvodom yavlyaetsya nevozmozhnost' ustanovleniya stacionarnogo sverhzvukovogo sfericheski-simmetrichnogo techeniya pri nalichii melkomasshtabnyh magnitnyh polei.
Authors: M. Sereno, Ph. Jetzer Comments: 7 pages, 4 figures, accepted for publication in MNRAS Razumeetsya, stat'ya soderzhit novye akkuratnye verhnie predely na otkloneniya dvizheniya tel Solnechnoi sistemy ot zakona obratnyh kvadratov. Ogranicheniya stanovyatsya vse zhestche i zhestche, i teoriyam s modificirovannoi gravitaciei stanovitsya vse slozhnee "vpisat'sya".
Authors: Joseph Silk, Mathieu Langer Comments: 7 pages, Submitted to MNRAS Kak izvestno, v standartnoi kartine pervye zvezdy (t.n. Pokolenie III) byli ochen' massivnymi (do soten mass Solnca). Eto svyazano s ih maloi metallichnost'yu. Odnako, bol'shaya massa - eto massa fragmenta oblaka, iz kotorogo obrazuetsya zvezda. Massa ee rastet za schet akkrecii na iznachal'no ochen' malomassivnoe (0.01 massy solnca) yadryshko. V raschetah obychno prenebregayut vliyaniem magnitnogo polya na rost massy. Uchetu etogo vliyaniya i posvyashena stat'ya. Avtory pokazyvayut, chto iz-za razvitiya magnito-vrashatel'noi neustoichivosti pole mozhet usilit'sya dostatochno dlya togo, chtoby stat' dinamicheski vazhnym. Itogom takogo razvitiya sobytii stanovitsya otnositel'no malaya (ne bolee 50) konechnaya massa zvezdy. Avtory ne nastaivayut na tom, chto ih model' "edinstvenno vernaya". Odnako, vopros i v samom dele nuzhdaetsya v detal'nom analize.
Authors: K. W. Yoon et al. Comments: 18 pages, 11 figures. To appear in Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, Proceedings of SPIE, 6275, 2006 Polyarizaciyu reliktovogo fona budut izmeryat' na sputnike Plank. No do ego zapuska raznye gruppy stremyatsya poluchit' maksimum s pomosh'yu nazemnyh ustanovok. Vot doklad o pervyh rezul'tatah s odnoi iz nih. Eto The Robinson Gravitational Wave Background Telescope (BICEP). On nachal svoyu rabotu v Antarktide. Konechno, "Plank", esli vse budet po planu, poluchit bolee detal'nuyu kartinu. Tem ne menee, ochen' vazhno, chtoby rabotali i ustanovki, podobnye BICEP.
Authors: P. Weltevrede, B.W. Stappers, J.M. Rankin, G.A.E. Wright Comments: 4 pages, 4 figures, accepted by ApJL Napomnyu, chto RRATs - Rotating Radio Transients - eto novyi tip neitronnyh zvezd, obnaruzhennyi menee goda nazad po ochen' korotkim vspyshka v radiodiapazone. Chto eto za neitronnye zvezdy, s kakimi izvestnymi tipami etih kompaktnyh ob'ektov oni svyazany (i svyazany li voobshe) - neizvestno. Avtory stat'i raportuyut ob obnaruzhenii pohozhih vspyshek u blizkogo pul'sara B0656+14. Esli by etot istochnik, pishut avtory, nahodilsya na rasstoyanii centra Galaktiki, to vse, chto my videli by eto samye moshnye impul'sy, ispyskaemye im. Prichem harakteristiki etih impul'sov byli by ochen' pohozhi na harakteristiki, nablyudaemyh vspyshek RRATs. Drugih pohozhih pul'sarov poka ne obnaruzheno. Bezuslovno, nuzhny novye nablyudeniya.
Authors: Ronald A. Remillard, Jeffrey E. McClintock Comments: 39 pages, 12 figures, ARAA, vol. 44, in press Bol'shoi i podrobnyi obzor, posvyashennyi dvoinym sistemam, v sostav kotoryh vhodyat chernye dyry (ili, kandidaty v chernye dyry, esli tak ugodno konservativnoi publike).
Authors: Maxwell Moe, Orsola De Marco Comments: 52 pages (referee format), 14 figures. Accepted by ApJ Kak ya uzhe mnogokratno pisal, vopros o proishozhdenii planetarnyh tumannostei ostaetsya otkrytym. Delo v tom, chto v osnovnom eti ob'ekty bolee ili menee bipolyarny. Otklonenie ot sfericheskoi simmetrii mozhno ob'yasnyat' ili vliyaniem magnitnogo polya, ili dvoistvennost'yu central'noi zvezdy. Vot tut-to i zaryta sobaka! Avtory provodyat detal'nyi populyacionnyi sintez s cel'yu razresheniya voprosa o proishozhdenii planetarnyh tumannostei. Vyvodom yavlyaetsya to, chto predpolozhenie o tom, chto imenno dvoinye porozhdayut tumannosti, horosho soglasuetsya s rezul'tatami raboty.
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