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| 21.03.03. (vypusk N36) astro-ph za 17 - 21 marta 2003 goda: izbrannye stat'i | |||
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Authors: Norbert Bartel
Authors: Andrej Cadez et al.
Authors: G.A. Tammann, A. Sandage, B. Reindl
Authors: Saul Perlmutter, Brian P. Schmidt
Authors: Yuri Levin, Andrei M. Beloborodov
Authors: Alexei V. Filippenko (U. C. Berkeley) and Luis C. Ho (Carnegie Observatories)
Authors: Steinn Sigurdsson Commets: 16 pages. See http://www.ociw.edu/ociw/symposia/series/symposium1/proceedings.html V obzore rassmatrivayutsya voprosy izmeneniya nevozmushennogo polya skorostei besstolknovitel'nyh zvezd pod deistviem central'noi sverhmassivnoi chernoi dyry galaktiki i skorost' ee rosta za schet zahvata zvezd polya.
Authors: Cheongho Han, Young Woon Kang Commets: total 7 pages, including 4 figures, ApJ, submitted Dlya togo, chtoby obnaruzhit' planetu u zvezdy-linzy pri sovremennoi strategii nablyudeniya sobytii mikrolinzirovaniya, planeta dolzhna lezhat' v ochen' uzkom intervale rasstoyanii ot svoei zvezdy. Odnako, esli sushestvenno povysit' chastotu nablyudeniya linziruemoi zvezdy, to poyavlyayutsya eshe dve gruppy udalennyh planet, kotorye stanovitsya vozmozhnym obnaruzhit'.
Authors: Miguel A. de Avillez, Dieter Breitschwerdt Commets: 7 pages, 3 Figures that include 4 simulation images (in jpeg format) and 2 plots (in ps format), to appear in the proceedings of "Star Formation Through Time" - A conference to honour Roberto J. Terlevich, ASP Conference Series V rabote provedeno modelirovanie struktury mezhzvezdnoi sredy na raznyh masshtabah. Dostignuto vysokoe razreshenie (0.625 pk). Takzhe udalos' poluchit' strukturu, podobnuyu Mestnomu puzyryu (Local Bubble). Vazhnym rezul'tatom yavlyaetsya malaya ob'emnaya dolya goryachego gaza. Zametim, odnako, chto model' nuzhdaetsya v dal'neishem razvitii.
Authors: R. Wichmann , J. H. M. M. Schmitt Commets: 5 pages, 2 colour figures, accepted for publication in MNRAS Pri obzore neba dlya poiska molodyh zvezd byla obnaruzhena blizkaya k Solncu kinematicheskaya gruppa F-G zvezd, nahodyashihsya na nachal'noi glavnoi posledovatel'nosti. Obsuzhdaetsya priroda zvezd etoi gruppy. Issledovaniya prostranstvennogo dvizheniya gruppy ukazyvaet, chto ona s naibol'shei veroyatnost'yu mogla rodit'sya v odnoi iz sleduyushih associacii: Perseus OB3 (Per OB3), Upper Centaurus-Lupus (UCL) i Lower Centaurus-Crux (LCC).
Authors: Yoshiaki Sofue Commets: To appear in PASJ, Latex 8 pages, 5 figures, See http://www.ioa.s.u-tokyo.ac.jp/~sofue/htdocs/2003gcs/ for original figures Predlozhena model', ob'yasnyayushaya poyavlenie obolochek, vidimyh na radiokartah Galakticheskogo centra. Ideya zaklyuchaetsya v povtornyh vspyshkah zvezdoobrazovaniya. Poslednyaya takaya vspyshka dolzhna byla proizoiti okolo 100 000 let nazad. V ramkah toi zhe modeli ob'yasnyayutsya obrazovaniya neskol'ko bol'shego masshtaba, svyazannye s bolee starymi (milliony let) vspyshkami.
O vspyshkah zvezdoobrazovaniya v centre Galaktiki sm. takzhe
astro-ph/0303436
"Stellar disk in the galactic center -- a remnant of a dense accretion disk?".
Authors: Rob Fender Commets: 41-page review. To appear in 'Compact Stellar X-Ray Sources', eds. W.H.G. Lewin and M. van der Klis, Cambridge University Press Obzor po struinym istecheniyam ot tesnyh dvoinyh sistem s akkreciruyushimi kompaktnymi ob'ektami.
Authors: Norbert Bartel Commets: Latex, 6 pages, 8 figures; Invited Review Talk at the `ADeLA2002 - Astrometry in Latin America'' Conference, Araraquara - Sao Paulo, 2 - 5 September 2002, to be published in ADeLA Publications Series, Vol. 1, 2003 Sovsem korotkaya zametka, kotoruyu vsem rekomenduem prochitat'. Rech' idet o vysokotochnyh nablyudeniyah s pomosh'yu interferometrov so sverhdlinnoi bazoi. Otnositel'nye koordinaty istochnikov pri takih nablyudeniyah opredelyayutsya s tochnost'yu poryadka desyatka mikrosekund dugi!!!
Authors: Joshua A. Faber Commets: 5 pages, no figures, RevTeX, submitted to ApJ Lett Eshe odna stat'ya diskussii ob interpretacii S.Kopeikina eksperimenta po prohozhdeniyu yupitera ryadom s kvazarom QSO J0842+1835. Avtor stat'i utverzhdaet, chto v dannom eksperimente byli izmereny postn'yutonovskie chleny vysokogo poryadka, kotorye otnosyatsya k zaderzhke Shapiro i lineino zavisyat ot skorosti gravitiruyushego tela, a izmerenie skorosti rasprostraneniya gravitacii pri dannoi tochnosti eksperimenta nevozmozhno.
Authors: Mark Lacy Commets: 10 pages, in, "Carnegie Observatories Astrophysics Series, Vol. 1: Coevolution of Black Holes and Galaxies", ed. L. C. Ho (Pasadena: Carnegie Observatories, http://www.ociw.edu/ociw/symposia/series/symposium1/proceedings.html) Dlya teh, kto lyubit sledit' za poslednimi dannymi - novyi obzor po sverhmassivnym chernym dyram. Privodyatsya nekotorye novye dannye, formuliruyutsya imeyushiesya problemy...
Authors: Pisin Chen Chernye dyry mogut isparyat'sya ne do konca, a ostavlyat' posle sebya chasticu subplankovskoi massy (~10-5 g). Takoi vyvod vytekaet iz ryada teorii, avtory stat'i privodyat dlya nego svoi osnovaniya. S drugoi storony, nekotorye teorii rannei Vselennoi (naprimer, modeli gibridnoi inflyacii) predskazyvayut rozhdenie mnogochislennyh pervichnyh chernyh dyr. Avtor utverzhdaet, chto nedoisparivshiesya ostatki etih chernyh dyr mogut i byt' temnoi materiei. [Prim. Perevodchika: Seichas massa temnoi materii sostavlyaet okolo 30% ot polnoi massy Vselennoi. Dlya vypolneniya etogo usloviya chernye dyry dolzhny byli s samogo nachala rozhdat'sya s malymi massami.]
Authors: Andrej Cadez et al. Commets: 6 pages, 7 figures. Published in A&A Journal-ref: 2001 A&A, 366, 930C O predvaritel'nyh rezul'tatah etogo eksperimenta soobshalos' v preprinte astro-ph/0301328. Bolee dlinnyi ryad sinhronnyh s osevym vrasheniem opticheskih nablyudenii pul'sara v Krabe po prezhnemu podtverzhdaet nalichie perioda 60 s, kotoryi interpretiruetsya kak svobodnaya precessiya. No v etih dannyh poyavilsya novyi sushestvennyi argument v pol'zu togo, chto eto precessiya - ee period zamedlyaetsya primerno v tom zhe tempe, v kakom izmenyaetsya period vrasheniya samogo pul'sara, kak i dolzhno byt' pri svobodnoi precessii!
Authors: M. Soffel, S.A. Klioner, G. Petit, P. Wolf, S.M. Kopeikin et al. Commets: 45 pages, 1 figure, submitted to Astronomical Journal Na svoei 24 General'noi assamblee Mezhdunarodnyi Astronomicheskii Soyuz prinyal ryad reshenii, v chastnosti o perehode ko vseobshemu ispol'zovaniyu relyativistskih sistem otscheta v astronomicheskoi praktike. No eti sistemy dostatochno slozhny i trebuyut celogo ryada poyasnenii. (Dura Lex, Sed Lex - "Zakon surov, no eto - zakon".)
Authors: G.A. Tammann, A. Sandage, B. Reindl Commets: 29 pages, 19 figures, 7 tables. Accepted for publication in Astronomy and Astrophysics Tammann i Sendedzh - lyudi-legendy. Novaya rabota posvyashena fundamental'neishei probleme v astronomii: opredeleniyu rasstoyanii po cefeidam. Ispol'zuya novye dannye (priyatno otmetit', chto zdes' vazhnuyu rol' igrayut issledovaniya, provodimye v GAISh i In-te Astronomii), avtory poluchayut utochnennye zavisimosti. Pervaya stat'ya serii posvyashena Galaktike, no uzhe tut avtory obsuzhdayut otsutstvie edinyh zavisimostei dlya razlichnyh galaktik.
Authors: P. Kaaret, J.J.M. in 't Zand, J. Heise, J.A. Tomsick Commets: 8 pages, to appear in ApJ Pri obrabotke dannyh poluchennyh ne sputnike RXTE vo vremya rentgenovskoi vspyshki na ob'ekte SAX J1748.9-2021 v 2001 godu byli obnaruzheny oscillyacii s chastotoi 409.7+/-0.3 Gc. Svetimost' vo vremya vspyshki sostavlyala (3.6+/-0.4) x 1038 erg/s, chto soglasuetsya s eddingtonovskim predelom dlya neitronnoi zvezdy massoi 1.4Mo i radiusom 10 km. Obsuzhdayutsya vozmozhnye prichiny dannyh pul'sacii.
Authors: Katherine E. McGowan et al. Commets: 24 pages, 6 figures, 3 tables, accepted for publication in ApJ XMM-N'yuton vpervye zaregistriroval pul'siruyushee rentgenovskoe izluchenie ot 143 ms pul'sara PSR J0538+2817. Spektr etogo izlucheniya - chernotel'nyi s temperaturoi Tinfty = (2.12 +0.04/-0.03) x 106 K, a radius izluchayushei oblasti - 0.70+/-0.02 km, t.e. svetit nagretaya polyarnaya shapka.
Authors: A. Gayler Harford and Nickolay Y. Gnedin Commets: submitted to ApJ Stat'ya posvyashena ostro aktual'noi i sovershenno svezhei probleme: WMAP izmeril opticheskuyu tolshu okruzhayushei nas povtorno ionizovannoi chasti Vselennoi. Eta velichina odnoznachno perevoditsya v moshnost' neobhodimogo dlya reionizacii zhestkogo izlucheniya. No okazalos', chto izvestnyh istochnikov ul'trafioletovogo izlucheniya (pervichnyh zvezd v molodyh galaktikah) dlya etogo ne hvataet.
Authors: Eric F. Bell et al. Commets: Submitted to the Astrophysical Journal. 15 pages, 6 embedded figures.
Obzor COMBO-17 dolzhen izmerit' cveta i svetimosti (v sobstvennoi
sisteme otscheta) okolo 25000 galaktik slabee mR<24
v intervale 0.2
Authors: P.M. Saz Parkinson et al. Commets: 19 pages, 8 figures, Latex Rentgenovskii istochnik Cirkul' X-1 (Cir X-1) nablyudaetsya uzhe bolee 30 let. Snachala eto delala Vela 5B, zatem Ariel, Ginga i, nakonec, RXTE. V stat'e obsuzhdaetsya peremennost' etogo istochnika na raznyh vremennyh masshtabah. Na kartine - 30-letnyaya krivaya bleska Ciknbsp;X-1.
Authors: T. Ott et al. Commets: 19 pages, 7 figures Journal-ref: The Messenger, No 111, p. 1-8 (March 2003) Pervoe detal'noe opisanie rezul'tatov opticheskih (blizhnii infrakrasnyi diapazon) issledovanii centra Mlechnogo Puti s pomosh'yu adaptivnoi optiki. Avtoram udalos' dostignut' ochen' vysokogo uglovogo razresheniya, a potomu vy imeete udovol'stvie rassmatrivat' eti ochen' krasivye kartinki!
Authors: Didier Fraix-Burnet, Philippe Choler, Emmanuel J.P. Douzery Commets: Kiel Euroconference (2002) "The Evolution of Galaxies III. From Simple Approaches to Self-Consistent Models", Kluwer Academic Publishers (in press) Biologiya zanimaetsya klassifikaciei razlichnyh sushestv i sushnostei na neskol'ko sot let bol'she, chem astrofizika. I podhod k klassifikacii u nih neskol'ko inoi. Tak popytka rasklassificirovat' galaktiki vydelila tri klastera ob'ektov:
Authors: P. Kaaret Commets: to appear in Advances in Space Research, 6 pages with one color figure (low-res) V stat'e opisyvaetsya proekt novogo sputnika. Plany svyazany s ochen' uspeshnoi missiei Rossi X-Ray Timing Explorer (RXTE), izyuminka kotoroi zaklyuchalas' v vysokom vremennom razreshenii. Schitaetsya, chto dlya sushestvennogo progressa novyi instrument dolzhen prevoshodit' staryi na poryadok (rech' idet o progresse v smysle "nepredskazuemy" t.n. serendipicheskih otkrytii). Tak ono i est' v dannom sluchae. Osnovnye prognoziruemye zadachi sputnika takovy: izuchenie kvaziperiodicheskih oscillyacii (osobenno bystryh oscillyacii ot kandidatov v chernye dyry) i millisekundnye oscillyacii v rentgenovskih vspleskah (barsterah). Odnako yasno, chto etim delo ne ogranichitsya. Avtor setuet, chto v proshedshem desyatiletii bylo vsego dve amerikanskie rentgenovskie missii (Chandra i RXTE), a potomu vazhno delat' eshe i eshe.... Budem nadeyat'sya, chto proekt poluchit podderzhku.
Authors: Bryan M. Gaensler Commets: 8 pages, 4 embedded EPS figures, uses ws-procs9x6.cls. To appear in proceddings of "Texas in Tuscany" (XXI Symposium on Relativistic Astrophysics) Korotkii obzor svezhih dannyh i idei po pul'saram i pul'sarnym vetram. Vozmozhno imenno pul'sarnye tumannosti smogut prolit' svet na vazhnye detali mehanizma raboty pul'sara. Po-krainei mere vo vsei etoi nauke poyavlyayutsya principial'no novye dannye, t.o. posle nekotorogo zastoya/zatish'ya pul'sarnaya mashina snova na perednem krayu astrofiziki.
Authors: Saul Perlmutter, Brian P. Schmidt Commets: In Supernovae & Gamma Ray Bursts, K. Weiler, Ed., Springer, Lecture Notes in Physics (in press), 24 pages, 7 figs
Dovol'no polnoe izlozhenie togo, kak po sverhnovym opredelyayut kosmologicheskie
parametry. Razbirayutsya (kratko) vse vozmozhnye istochniki neopredelennostei.
Mnogo (bolee 100) ssylok.
Authors: Alexei V. Filippenko (U. C. Berkeley) and Luis C. Ho (Carnegie Observatories) Commets: To appear in ApJ (Letters). 5 pages
Do sih por schitalos', chto sverhmassivnye central'nye chernye dyry
sushestvuyut tol'ko v galaktikah s baldzhem (i ih massy proporcional'ny
masse baldzha). A vsya nemnogochislennaya gruppa galaktik pro kotorye
tochno izvestno, chto v nih net central'nyh chernyh dyr - bezbaldzhevye.
Authors: Yuri Levin, Andrei M. Beloborodov (CITA) Commets: submitted to ApJ Letters Eta stat'ya o dvizhenii zvezd vblizi central'noi chernoi dyry v nashei Galaktike. Ob izmerenii ih dvizhenii uzhe soobshalos' (sm. zdes', zdes' ili astro-ph/0303151). Na segodnyashnii den' postroeny 3-mernye orbity dlya 13 zvezd. Vse eti zvezdy dostatochno yarkie i massivnye, sledovatel'no molodye. Okazyvaetsya 10 iz 13 orbit lezhat pochti v odnoi ploskosti. Avtory predpolagayut, chto oni obrazovalis' iz massivnogo i umerenno tolstogo (s uglom raskrytiya ~10o) akkrecionnogo diska. Sam disk uzhe ne nablyudaetsya - ego veshestvo ne prevrativsheesya v zvezdy uzhe vypalo na chernuyu dyru. No orbita samoi blizkoi iz zvezd - nazvannoi S2 - naklonena k disku na 75o. Avtory schitayut, chto kogda to i ee orbita lezhala v toi zhe ploskosti, no byla povernuta v segodnyashnee polozhenie precessiei Lenze-Tiringa. Na eto dolzhno bylo uiti 5/a millionov let (0<=a<1 - bezrazmernyi moment vrasheniya chernoi dyry). Esli eto tak, to chernaya dyra v centre Mlechnogo Puti dostatochno bystro vrashaetsya - a>0.2.
Authors: Martin Elvis et al. Commets: Paper presented at the August 2002 SPIE meeting "Astronomical Telescopes and Instrumentation", Kona, Hawaii Koncepciya novogo kosmicheskogo eksperimenta, kotoryi budet zanimat'sya spektroskopiei vysokogo razresheniya (E/dE~6000) na granice rentgenovskogo i ul'trafioletovogo diapazonov. Obsuzhdayutsya nablyudatel'nye zadachi.
Authors: Margarita Karovska, Martin Elvis and Massimo Marengo Commets: 6 pages, 2 postscript figures, to appear in the proceedings of the JENAM 2002 Workshop WS-VLTI "The Very Large Telescope Interferometer: Challenges for the Future", Editors: P.J.V. Garcia, A. Glindemann, Th. Henning, F. Malbet, Ap&SS, Kluwer, in press Predlagaetsya novyi metod interferometricheskogo opredeleniya rasstoyanii do kvazarov. Novizna zaklyuchaetsya v ispol'zovanii novogo "standartnogo metra": oblastei shirokih emissionnyh linii. VLTI po ocenkam avtorov vpolne mozhet spravit'sya s takoi zadachei. Zametim, chto deistvitel'no "standartnaya lineika" luchshe "standartnoi svechi", t.k. menee podverzhena sistematike. Problema v tom, chtoby lineika deistvitel'no byla standartnoi.
Authors: Ramesh Narayan, Jeremy S. Heyl Commets: 56 pages, 19 figures, submitted to the Astrophysical Journal Bol'shaya original'naya teoreticheskaya rabota, zhestko privyazannaya k real'nym nablyudatel'nym dannym. Rassmatrivaetsya "sud'ba" veshestva (vodoroda i geliya), nakopivshegosya na poverhnosti neitronnoi zvezdy v processe akkrecii. Delo v tom, chto v takom veshestve mogut nachinat'sya termoyadernye reakcii. Pri etom nablyudaetsya rentgenovskaya vspyshka (istochniki takoi aktivnosti nazyvayutsya "rentgenovskie barstery").
Authors: Andreas Reisenegger, Axel Bonacic Commets: 6 pages,3 figures, to be published in the conference proceeding of "International Workshop On Pulsars, AXPs And SGRs Observed With Bepposax And Other Obervatories", Marsala (Sicily, Italy), 23 - 25 September 2002 Obsuzhdaetsya rol' vyazkosti pri evolyucii molodoi neitronnoi zvezdy, v kotoroi vozbuzhdeny r-mody. Poslednie ispytali pristal'noe vnimanie teoretikov v poslednie neskol'ko let v svyazi s tem, chto, kak polagali, imenno oni mogli otvechat' za nachal'nye periody neitronnyh zvezd, a takzhe mogli by byt' nablyudaemy s pomosh'yu detektorov gravitacionnyh voln. Odnako, fizika processa okazalas' ochen' slozhnoi (my vse-taki ploho predstavlyaem, kak vnutri ustroeny neitronnye zvezdy). Poetomu entuziazm neskol'ko ugas, i nachalas' ser'eznaya rabota.
Authors: Thomas M. Tauri, Ed van den Heuvel Commets:46 pages, 17 figures. Review to appear in the book 'Compact Stellar X-Ray Sources', eds. W.H.G. Lewin and M. van der Klis, Cambridge University Press Glava iz sbornika, posvyashennaya tesnym dvoinym sistemam s akkreciruyushim kompaktnym ob'ektom (neitronnoi zvezdoi ili chernoi dyroi). Rassmatrivayutsya vse osnovnye processy, otvechayushie za evolyuciyu i astrofizicheskie proyavleniya takih sistem.
Authors: Tim de Zeeuw Commets: 12 pages, LaTeX, no figures. To appear in: Carnegie Observatories Astrophysics Series, Vol. 1: Coevolution of Black Holes and Galaxies, ed. L. C. Ho (Cambridge: Cambridge Univ. Press) V poslednee desyatiletie obshepriznannoi stala korrelyaciya mezhdu massoi baldzha galaktiki i massoi ee central'noi chernoi dyry. Byl zamechen i ryad drugih effektov. V dannoi stat'e podvedeny "itogi" serii simpoziumov i rassmotreny voprosy koevolyucii galaktik i ih chernyh dyr nachinaya s z>6.
Authors: Bruce Gendre et al. Commets: 4 pages, 3 B&W figures. Accepted for publication in A&A Letters Avtory opisyvayut nablyudeniya slabogo rentgenovskogo istochnika v sharovom skoplenii. Svetimost' istochnika (7-8)1032 erg/s. Avtory polagayut, chto eto tesnaya dvoinaya s neitronnoi zvezdoi v "spokoinom" sostoyanii. Odnako, vozmozhno, chto etot istochnik (kak i nekotorye drugie slabye rentgenovskie istochniki v sharovyh skopleniyah) yavlyaetsya staroi akkreciruyushei odinochnoi neitronnoi zvezdoi (istochnik raspolozhen vblizi centra skopleniya, gde dolzhny byt' naibolee medlennye starye neitronnye zvezdy, i gde plotnost' gaza bol'she). T.o. takaya svetimost' vpolne mozhet ob'yasnyat'sya odinochnoi akkreciruyushei neitronnoi zvezdoi so slabym polem. Ideya o nablyudenii odinochnyh akkreciruyushih neitronnyh zvezd v sharovyh skopleniyah ne nova (sm. astro-ph/0009212 i astro-ph/0102201). Vpolne vozmozhno, chto pervye odinochnye akkreciruyushie neitronnye zvezdy budut identificirovanny imenno v sharovyh skopleniyah.
Authors: M. Kramer et al. Commets: accepted for publication in MNRAS, 31 pages, 10 figures
Sama stat'ya zanimaet menee 8 stranic. Ostal'noe - tablicy, profili impul'sov
i t.d. Kartinki dovol'no interesnye i informativnye (imeetsya vvidu, chto dazhe
dlya nespecialistoov eto mozhet byt' interesno v plane obshego razvitiya).
Opisyvayutsya svoistva molodyh pul'sarov (velopodobnye, t.e. pohozhie na
pul'sar v Vele - Parusah). Obsuzhdaetsya vozmozhnaya svyaz' molodyh pul'sarov s
neotozhdestvlennymi gamma-istochnikami sputnika EGRET.
My budem starat'sya hotya by perechislit' interesnye (dlya shirokoi publiki)
stat'i, poyavivshiesya v razdele
physics
(vklyuchaya cross-listing).
Authors: Kevin A. Pimbblet, John C. Newman Commets: 9 pages. Accepted for publication in a special issue of Physics Education
Stat'ya posvyashena tomu, kak v Velikobritanii reshayut problemu kosmologicheskogo
obrazovaniya. Chto normal'nyi chelovek dolzhen znat' po kosmologii?
Eto ne prostoi vopros, osobennov svyazi s tem, chto mnogie kosmologicheskie
ponyatiya adekvatno i kratko prostymi slovami prosto nel'zya ob'yasnit'.
Authors: Mario Rabinowitz Commets: 4 pages Korotkaya zametka, posvyashennaya Shvingeru.
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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