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11.10.02. astro-ph za 07 - 11 oktyabrya 2002 goda: izbrannye stat'i |
Polucheny ogranicheniya na velichinu magnitnogo polya dlya dvuh neitronnyh zvezd, vhodyashih v tesnye dvoinye sistemy. Dlya SAX J1808.4-3658 obnaruzheny pul'sacii na chastote 400 Gc. Eti dannye pozvolyayut utverzhdat', chto pole zaklyucheno v uzkom intervale ot 108 do 5 108Gs. Dlya vtoroi sistemy, Aql X-1, polucheno, chto pole ne prevoshodit 109Gs.
Authors: D. Wittman et al. Comments: to appear in Proc. SPIE Vol. 4836 DLS - Deep Lens Survey. Eto nablyudeniya semi ploshadok 2 na 2 gradusa. Vse dannye nablyudenii srazu budut dostupny dlya obshestvennosti. Osnovnye zadachi proekta - poisk tranzientnyh yavlenii i izuchenie slabogo grav.linzirovaniya. Krome togo, avtory nadeyutsya, chto dostupnost' ishodnyh dannyh pozvolit poluchit' massu "soputstvuyushih" rezul'tatov.
Authors: J. Ellis et al. Comments: 27 pages, 9 figs Mnogie modeli kvantovoi gravitacii predskazyvayut "pennuyu" strukturu prostranstva-vremeni. Avtory issleduyut vozmozhnost' obnaruzheniya rezul'tatov vzaimodeistviya gamma-kvantov s etoi prostranstvenno-vremennoi penoi. Dlya etogo issleduyutsya profili gamma-vspleskov. Estestvenno, poluchen lish' verhnii predel na masshtab kvantovoi gravitacii: 6.9 1015 GeV.
Authors: Arnold I. Boothroyd, I.-Juliana Sackmann Comments: LaTeX, 38 pages (including 8 figures); ApJ, in press. Added figures/color figurea available at http://www.cita.utoronto.ca/~boothroy/sun4.html Avtory publikuyut bol'shuyu seriyu statei po Solncu i gelioseismologii. V dannoi rabote rassmatrivayutsya istochniki neopredelennostei v standartnoi modeli Solnca: dannye po neprozrachnosti, dannye po obiliyu elementov, parametry diffuzii. Ocenivaetsya vklad kazhdogo iz nih v rezul'taty gelioseismologicheskih issledovanii.
Authors: H. Baumgardt, P. Hut, J. Makino, S. McMillan, S. Portegies Zwart Comments: 11 pages, 3 figures, submitted to ApJL Avtory s pomosh'yu specializirovannogo komp'yutera GRAPE-6 provodyat raschet struktury vnutrennih chastei skopleniya M15 i provodyat sravneniya s nablyudeniyami. Napomnyu, chto nedavno imenno etot ob'ekt stal populyaren v svyazi s vozmozhnost'yu sushestvovaniya v nem chernoi dyry promezhutochnoi massy. Avtory kak raz prihodyat k vyvodu, chto nikakoi chernoi dyry ne nuzhno dlya ob'yasneniya nablyudatel'nyh dannyh, hotya dyra s massoi 1000 mass Solnca ne isklyuchena. Sm. takzhe astro-ph/0210158, gde takzhe obsuzhdaetsya nalichie chernoi dyry v M15, i massa ee poluchaetsya ravnoi 5400-1000 (ili men'she!) mass Solnca.
Authors: Reva Kay Williams Comments: 29 pages, including 6 eps figures, AASTeX, to appear in ApJ Avtor chislenno i analiticheski issleduet process Penrouza. Pokazano, chto v real'nyh sverhmassivnyh chernyh dyrah i chernyh dyrah zvezdnyh mass sushestvenno bolee vazhnym okazyvayutsya imenno gravitacionnye effekty, a effekty, svyazannye s magnitnymi polyami (polem diska, naprimer), menee vazhny. Raschety sravnivayutsya s nablyudeniyami kvazarov, lacertid i galakticheskih istochnikov.
Authors: Denise Kaisler, Ben Zuckerman, Eric Becklin, Bruce Macintosh Comments: 4 pages, 2 figures. To appear in "Scientific Frontiers in Research on Extrasolar Planets", D. Deming ed Osnovoi nazemnyh issledovanii vnesolnechnyh planet yavlyayutsya: adaptivnaya optika, bol'shie pervichnye zerkala i tshatel'nyi otbor ob'ektov nablyudeniya. Obzor, predstavlyaemyi avtorami, provoditsya v blizhnem infrakrasnom diapazone. On pozvolyaet obnaruzhivat' planety s massami ot 1 do 10 mass Yupitera na rasstoyanii do 100 a.e. ot central'nyh zvezd. Zvezdy dolzhny byt' molodymi (vozrast menee 60 mln. let) i blizkimi (rasstoyanie menee 60 pk). Proekt uzhe rabotaet, i v dannoi stat'e avtory predstavlyayut pervye rezul'taty.
Authors: L. Zampieri, et al. Comments: 7 pages, 3 figures. MNRAS, in press Sredi sverhnovyh vtorogo tipa - vzryvy massivnyh zvezd - nablyudaetsya dovol'no bol'shoi razbros svoistv. V chastnosti, est' bolee slabye sverhnovye. Avtory predstavlyayut dva primera takih vzryvov. I obsuzhdayut vozmozhnost' togo, chto takie vspyshki soprovozhdayutsya bol'shoi vozvratnoi akkreciei (fall-back). Sootvetstvenno, takie vzryvy dolzhny privodit' k obrazovaniyu chernyh dyr. Krome togo, stadiya akkrecii mozhet vposledstvii nablyudat'sya, kogda akkrecionnaya svetimost' nachnet dominirovat'.
Authors: A. Falvard et al. Comments: Latex, 32 pages, 12 figures, 5 tables CELESTE - CErenkov Low Energy Sampling & Timing Experiment. Eto nazemnyi eksperiment, ispol'zuyushii zerkala "solnechnoi elektrostancii". V dannoi rabote obsuzhdaetsya vozmozhnost' obnaruzheniya gamma-luchei ot annigilyacii chastic temnoi materii v Tumannosti Andromedy. Fakt publikacii stat'i govorit o tom, chto avtoram udalos' podobrat' nabor parametrov, pri kotoryh mozhno ozhidat' registracii signala.
Authors: Nicholas D. Lyford, Thomas W. Baumgarte, Stuart L. Shapiro Comments: 6 pages, to appear in ApJ Neitronnye zvezdy (osobenno molodye) obladayut differencial'nym vrasheniem. Eto privodit k uvelicheniyu maksimal'noi vozmozhnoi massy. Dannaya situaciya i issleduetsya avtorami. V chastnosti vazhnym okazyvaetsya sluchai slivayushihsya neitronnyh zvezd, kotorye bez effektov diff.vrasheniya dolzhny bystro kollapsirovat' v chernuyu dyru.
Authors: M.Tosi Comments: Summary of a general discussion held at the EuroConference "The evolution of galaxies. III: From simple approaches to self-consistent models", A&SS (Kluwer) in press. 10 pages, 4 eps figs Sobstvenno, vse o soderzhanii stat'i skazano v zagolovke i kommentarii. Avtor vynuzhden kratko kosnut'sya shirokogo spektra voprosov, svyazannyh s karlikovymi galaktikami. Po obzoru mozhno sostavit' horoshee vpechatlenie o sovremennom sostoyanii del v etoi oblasti astrofiziki.
Authors: Sukyoung K. Yi et al. Comments: 7 pages, TeX, 1 eps figure. ApJS, 2003, vol.144 (Feb), in press Avtory predstavlyayut biblioteku evolyucionnyh trekov dlya zvezd s massami ot 0.4 do 5 mass Solnca. Dany ssylki na tri saita (v treh mestah raboty treh soavtorov - v Koree, SShA i Britanii), gde mozhno skachat' dannye. Adres amerikanskogo - www.astro.yale.edu/demarque/yystar.html
Authors: Shiho Kobayashi, Peter Meszaros Comments: 26 pages, 5 figures, submitted to ApJ Issleduyutsya vozmozhnye gravitacionnye signaly v razlichnyh modelyah gamma-vspleskov: sliyaniya kompaktnyh ob'ektov i vzryvy massivnyh zvezd. Dayutsya ocenki dlya budushih nablyudenii na vtoroi ocheredi LIGO.
Authors: Adam Burrows, Todd A. Thompson Comments: 10 pages, LaTeX, 4 JPEGs included. To be published in the proceedings to the ESO/MPA/MPE Workshop (an ESO Astrophysics Symposium) entitled "From Twilight to Highlight: The Physics of Supernovae," held in Garching bei M\"unchen, Germany, July 29-31, 2002, eds. Bruno Leibundgut and Wolfgang Hillebrandt (Springer-Verlag) Obsuzhdaetsya sovremennyi status neitrinnyh modelei vzryvov sverhnovyh. Eto samaya standartnaya i naibolee prodvinutaya model' vzryva v rezul'tate kollapsa yadra massivnoi zvezdy. Rassmatrivayutsya problemy modeli i avtorskie popytki ih preodoleniya.
Authors: David Sudarsky, Adam Burrows, Ivan Hubeny Comments: 46 pages, LaTeX, plus 36 postscript figures, submitted to the Astrophysical Journal Chislo otkrytyh ekzoplanet postoyanno rastet. Rastet i chislo teoreticheskih rabot po etoi tematike. Gruppa avtorov, mnogo rabotavshaya nad raschetami spektrov korichnevyh karlikov i ochen' malomassivnyh zvezd, predstavlyaet raschety spektrov planet-gigantov. Var'iruyutsya samye raznye parametry. V tom chisle i sostav atmosfery. tak chto krome rezul'tatov po spektram avtory predstavlyayut i detal'nye raschety atmosfer. T.k. v skorom vremeni ozhidaetsya zapusk neskol'kih proektov, cel'yu kotoryh yavlyaetsya poluchenie spektrov ekzoplanet, to dannaya rabota bolee chem aktual'na, i navernyaka stanet odnoi iz vysokocitiruemyh.
Authors: Eric V. Linder Comments: 6 pages, 2 figures; invited talk at IDM2002 V poslednee vremya poyavlyaetsya bol'shoe chislo statei, posvyashennyh poektu SNAP. V dannoi obsuzhdaetsya vozmozhnost' obnaruzheniya variacii uravneniya sostoyaniya temnoi energii so vremenem. Kak vsegda avtoru udaetsya naiti varianty, v kotoryh SNAP smozhet zametit' takuyu variaciyu na urovne treh standartnyh otklonenii.
Authors: Philippe Ferrando Comments: 4 pages, 3 figures, Proceedings SF2A-2002, Paris, ed. F. Combes and D. Barret, EDP-Sciences Ocherednoi proekt nebol'shogo rentgenovskogo teleskopa. Osobennost' novogo podhoda - sozdanie ochen' dlinnofokusnyh instrumentov: desyatki metrov. Eto dostigaetsya ispol'zovaniem dvuh apparatov (predstav'te teleskop - ob'ektiv, okulyar - no bez truby, a vse eto otdel'noi letaet v kosmose). Tehnologiya budet vskore otrabotana (proekt ZEUS), i v dal'neishem podobnye apparaty mogut stat' otnositel'no deshevymi. Na eto i rasschityvayut avtory proekta, zapusk kotorogo planiruetsya na 2009 g.
Authors: F. Combes Comments: 8 pages, 4 figures, in "Active Galactic Nuclei: from Central Engine to Host Galaxy" ASP Conf. Ser., 2003, ed. S. Collin, F. Combes and I. Shlosman Daetsya obzor mnogovolnovyh nablyudenii aktivnyh galaktik s cel'yu issledovaniya ih "dvigatelei": kak okoloyadernyh vspyshek zvezdoobrazovaniya tak i sverhmassivnyh chernyh dyr.
Authors: Bianca M. Poggianti Comments: Invited review at the JENAM 2002 Workshop on "Galaxy Evolution in Groups and Clusters", Porto, Sep 5-7 2002, eds. Lobo, Serote-Roos and Biviano, Kluwer in press O tom kak "sreda zaedaet" galaktiki. Galaktiki v skopleniyah ispytyvayut vliyanie sosedei. Avtor daet obzor "prevrashenii" galakti v skopleniyah, udelyaya osoboe vnimanie ne tol'ko morfologii, no i spektral'nym harateristikam.
Authors: C. W. Akerlof et al. Comments: 19 pages, including 4 figures. To be published in PASP in January, 2003. PASP Number IP02-110 Nablyudeniya opticheskoi vspyshki gamma-vspleska GRB990123 s pomosh'yu sistemy ROTSE bylo bol'shim dostizheniem. S teh por prodolzhayutsya popytki povtorit' etot rezul'tat. Odnako, poka nikakih uspehov net. Potomu prodolzhayut razvivat' mat.chast'. V stat'e opisyvaetsya sistema ROTSE-III. Avtory nadeyatsya, chto ih opyt okazhetsya poleznym dlya sozdatelei analogichnyh sistem, kotorye seichas nachinayut poyavlyat'sya vo vsem mire.
Arhiv statei, voshedshih v predydushie vypuski.
Razdely arhiva (s iyulya 2002 g.): Poleznye astronomicheskie ssylki. Obzornye stat'i v astro-ph s 2001 g. |
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