Novyi konkurs AstroTopa:
"Zvezdy AstroRuneta - 2003"
Podpiska na rassylku obzorov astro-ph na Subscribe.Ru
Soderzhanie i bystryi perehod k razdelam obzora
Obzor centra Galaktiki v zhestkom rentgene po dannym INTEGRAL/IBIS. Katalog istochnikov Kak chernye dyry poluchayut tychki Desyat' samyh pohozhih na Solnce Trehmernaya karta raspredeleniya temnoi materii po dannym obzora COMBO-17 Rasfokusirovka dzheta poperechnym vetrom: laboratornaya astrofizika
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.
Razdely arhiva (s aprelya 2003 g.): Poleznye astronomicheskie ssylki. Korotkoe esse ob elektronnyh preprintah. Obzornye stat'i v astro-ph s 2001 g.
Avtory proekta
Proekt razmeshen na saitah:
Vy mozhet takzhe razmestit' na svoem saite nashu lentu obzorov Novosti astronomii ot PRAO Tekushie otkrytiya v FECh Novosti kosmonavtiki Novosti ot UFN Informnauka Perst Podpiska na rassylku obzorov na Subscribe.Ru
Druzhestvennaya rassylka Sozdavaemyi katalog on-lainovoi nauchnoi literatury |
Obzory preprintov astro-ph
Vypusk N68
astro-ph za 01 - 07 fevralya 2004 goda: izbrannye stat'i
Referaty otdel'nyh statei
Authors: Wlodek Kluzniak, Marek A. Abramowicz, William H. Lee Comments: 4 pages, presented at X-ray Timing 2003: Rossi and Beyond, Boston, November 2003 QPO - kvaziperiodicheskie oscillyacii. Eto vazhnyi fenomen, nablyudayushiisya v akkreciruyushih tesnyh dvoinyh sistemah s neitronnymi zvezdami i chernymi dyrami. Prichiny vozniknoveniya QPO neyasny. Est' dostatochno mnogo modelei i vse vremya poyavlyayutsya novye (sm. samuyu poslednyuyu v svezhei rabote The MHD Alfven wave oscillation model of kHz Quasi Periodic Oscillation of Accreting X-ray Binaries). Zdes' zhe avtory rassmatrivayut QPO kak nelineinyi rezonans (sm. takzhe ih stat'yu Resonance in forced oscillations of an accretion disk and kHz QPOs). Poskol'ku yavlenie nablyudaetsya i u sistem s neitronnymi zvezdami, i u sistem s chernymi dyrami, to, polagayut avtory, nado smotret' na to obshee, chto u nih est'. U chernyh dyr net ni poverhnosti, ni magnitnogo polya. Znachit, ostaetsya akkrecionnyi disk. I imenno on igraet klyuchevuyu rol' v ih modeli: QPO - eto rezonansnye kolebaniya akkrecionnogo diska. V otdel'noi stat'e (astro-ph/0402012) avtory rassmatrivayut QPO v sistemah s chernymi dyrami, nadeyas' s pomosh'yu etogo instrumenta poluchit' otvet o prirode ul'tramoshnyh rentgenovskih istochnikov.
Authors: J. Forbrich et al. Comments: 4 pages, 1 figure. (Co)authored by members of the MPIfR (Sub)millimeter Astronomy Group. To appear in the Proceedings of the 4th Cologne-Bonn-Zermatt-Symposium "The Dense Interstellar Medium in Galaxies" eds. S. Pfalzner, C. Kramer, C. Straubmeier, & A. Heithausen (Springer: Berlin) Nablyudat' rozhdenie zvezd ne ochen' prosto, t.k. na etoi stadii zvezdy pogruzheny v gazopylevye obolochki. Dostatochno effektivny nablyudeniya v millimetrovom diapazone. Imenno v hode takih issledovanii avtory obnaruzhili istochnik, kotoryi oboznachili UYSO 1: Unidentified Young Stellar Object 1. Po vsei vidimosti eto molodaya massivnaya (neskol'ko desyatkov mass solnca vmeste v obolochkoi) protozvezda. S nei svyazan moshnyi molekulyarnyi vybros (sm. risunok).
Authors: R. Guesten, S. Philipp Comments: 10 pages, 3 figures. Version with full graphics available from ftp://ftp.mpifr-bonn.mpg.de/outgoing/sphilipp (Co)authored by members of the MPIfR (Sub)millimeter Astronomy Group. To appear in the Proceedings of the 4th Cologne-Bonn-Zermatt-Symposium "The Dense Interstellar Medium in Galaxies" eds. S. Pfalzner, C. Kramer, C. Straubmeier, & A. Heithausen (Springer: Berlin) Yadra aktivnyh (i ne ochen' aktivnyh) galaktik i ih okrestnosti - eto burnyi kotel. Razumeetsya, central'naya chast' nashei Galaktiki yavlyaetsya samym blizkim primerom takih oblastei. Poetomu ee issledovanie predstavlyaet dopolnitel'nyi interes, t.k. my mozhem uznat' koe-chto o processah, kotorye ne mozhem rassmotret' v dalekih galakticheskih yadrah. V etom obzore rasskazyvaetsya o central'nom molekulyarnom diske (sloe) razmerom primerno 450 na 50 pk. Ego massa sostavlyaet okolo 108 solnechnyh mass. Opisyvaetsya, kak eti molekulyarnye oblaka svyazany so zvezdoobrazovaniem v galakticheskom centre. Avtory upominayut filamenty (volokna) v centre Galaktiki. Bolee detal'no ob etih obrazoavniyah mozhno prochest' v rabote New Nonthermal Filaments at the Galactic Center: Are They Tracing a Globally Ordered Magnetic Field?.
Authors: Philipp Podsiadlowski, Eric Pfahl , Saul Rappaport Comments: 4 pages, 2 figures, Proc. of La Paz Meeting, IAUC 194: "Compact Binaries in the Galaxy and Beyond" Korotkii obzor, posvyashennyi novostyam v issledovanii tesnyh dvoinyh sistem. Zametnaya chast' otvedena rabotam samih avtorov, no eto vpolne zakonno: v poslednie gody ih gruppa deistvitel'no poluchila mnogo interesnyh rezul'tatov kak v nablyudeniyah, tak i v teorii.
Authors: M.Revnivtsev et al. Comments: 6 pages, 3 figures. Accepted for publication in Astronomy Letters. Version with original quality figures can be taken from http://integral.rssi.ru/~mikej/integral_gc_survey_pazh_eng.ps.gz Stroit' izobrazheniya v zhestkom diapazone ochen' tyazhelo. Poslednii obzor centra Galaktiki na energiyah >40 keV byl proveden na rossiiskom sputnike GRANAT s pomosh'yu pribora SIGMA bolee 5 let nazad. I vot Integral snova "rentgenografiruet serdce Galaktiki". Summirovany rezul'taty glubokogo (bolee 2 millionov sekund) obzora centra Galaktiki, provedennogo v sentyabre 2003 g. na sputnike Integral. Bylo zaregistrirovano okolo 60 istochnikov. 43 iz nih otozhdestvleny s izvestnymi tesnymi dvoinymi sistemami (bol'shinstvo iz nih - eto barstery, sistemy s neitronnymi zvezdami, proyavlyayushie vspyshechnuyu aktivnost'), 1 - s anomal'nym rentgenovskim pul'sarom, 2 - s kataklizmicheskimi peremennymi, 1 - s istochnikom myagkih povtoryayushihsya gamma-vspleskov, 3 - s vnegalakticheskimi istochnikami. 10 istochnikov ne otozhdestvleny. Po krainei mere 2 istochnika yavlyayutsya novymi. Sam central'nyi istochnik Sgr A* ne obnaruzhen (na karte pokazan krestom). Konechno, po otdel'nym interesnym ob'ektam budut otdel'nye publikacii s detal'nym analizom. Karta pokazana na risunke. Razmer izobrazheniya 35 na 25 gradusov.
Authors: M. De Jesus Comments: 9 pages, Latex, 12 figures., Review talk presented at the XXIst International Symposium on Lepton and Photon Interactions at High Energies, 11-16 August 2003, FNAL, Batavia, Illinois, USA My neodnokratno pisali i budem pisat' o popytkah laboratornoi registracii chastic temnoi materii (v kachestve vvedeniya sm. stat'yu Martina Risa nizhe). V dannom sluchae stat'ya predstavlyaet soboi korotkii obzor po poisku neitralino.
Authors: Martin J. Rees Comments: 10 pages, 1 figure. Latex (Phil. Trans. R. Soc. Lond. A (2003) 361, 2427-2434) Krome togo, chto Martin Ris - ser, krome togo, chto on yavlyaetsya odnim iz samyh citiruemyh (ili samym?) astrofizikov v mire, on eshe i horoshii populyarizator (posmotrite ego knizhki, naprimer, na Amazon.com ili eshe kakoi-nibud' analogichnoi sisteme). Sootvetstvenno, on umeet dostupno i kvalificirovanno rasskazyvat' ob astronomii i fizike. V dannom sluchae - chitaite rasskaz o temnoi materii.
Authors: M. Ribo et al. Comments: 2 pages. To appear in RevMexAA(SC) Conference Series, Proc. of IAU Colloquium 194, "Compact Binaries in the Galaxy and Beyond", La Paz, Mexico, 17-21 November 2003, G. Tovmassian & E. Sion (eds.) Mikrokvazary - eto tesnyh dvoinye sistemy s chernymi dyrami, u kotoryh nablyudayutsya relyativistskie dzhety. Schitaetsya, chto fizika vybrosov pohozha na tu, chto opredelyaet gigantskie dzhety kvazarov, tol'ko vot massa chernoi dyry ne desyatki millionov mass Solnca, i v million raz men'she - otsyuda i nazvanie. Avtory ishut novye mikrokvazary na nizkih galakticheskih shirotah (t.e. v ploskosti Galaktiki) putem korrelyacii dannyh sputnika ROSAT i radionablyudenii. Poka nichego ne obnaruzheno ... Sovetuem takzhe prochest' stat'yu SS433:the microquasar link with ULXs?, gde rasskazyvaetsya ob istochnike SS433 i obsuzhdaetsya vozmozhnaya svyaz' mikrokvazarov s ul'tramoshnymi istochnikami.
Authors: Marc Favata et al. Comments: 4 pages, 2 figues, emulateapj style My pozvolili sebe nemnogo vol'nyi perevod slova kick. Rech' idet o tom, chto kompaktnye ob'ekty (neitronnye zvezdy i chernye dyry) mogut poluchat' dopolnitel'nye skorosti. Naprimer, eto mozhet proishodit' iz-za nekotorogo tolchka. Poetomu eti dopolnitel'nye skorosti nazyvayut kick velocity. Na samom dele mehanizm kika neizvesten, i obsuzhdayutsya samye raznye varianty, daleko ne vse oni vyglyadyat kak nekotoryi "tychok". Dlya dvoinyh kompaktnyh ob'ektov eshe v 1961 g. byl predlozhen ochen' krasivyi mehanizm. Predstav'te sebe sistemu iz dvuh chernyh dyr. Takaya para budet sblizhat'sya za schet gravitacionnogo izlucheniya (kotoroe unosit orbital'nyi moment) poka ne sol'etsya. No! Esli massy dvuh zvezd ne ravny, to budet i lineinyi moment, t.e. sistema budet priobretat' skorost'. I skorost' ves'ma bol'shuyu! Na moment sliyaniya ona mozhet dostich' tysyachi km/s. Dannyi mehanizm neodnokratno rassmatrivalsya raznymi avtorami (sm. naprimer stat'yu Early reionization by miniquasars , gde rassmatrivaetsya vopros o vybrose chernyh dyr promezhutochnyh mass v svyazi so sliyaniyami na bol'shih krasnyh smesheniyah). V etoi stat'e avtory bolee tshatel'no rassmatrivayut eto mehanizm, i prihodyat k vyvodu o tom, chto v real'noi astrofizicheskoi situacii vpolne mozhno poluchat' skorosti vplot' do 500-600 km/s pri tipichnom znachenii 100-200 km/s, chto uzhe nemalo, i vazhno dlya mnogih astrofizicheskih prilozhenii. Etoi zhe tematike posvyashena vtoraya stat'ya avtorov astro-ph/0402057. Lichno mne (SP.) osobenno priyatno dumat' o pare sverhmasivnyh chernyh dyr v centre kakoi-nibud' galaktiki, kotorye sblizhayutsya, priobretaya pri etom skorost'....
Authors: Raymundo Baptista Comments: 5 pages, 3 postscript figures, 2 links for animated gif files, coded with AN latex style file. To appear in Astron. Nachrichten Dlya kataklizmicheskih peremennyh (dvoinye sistemy s belym karlikom) mozhno pytat'sya stroit' izobrazheniya akkrecionnogo diska, esli nablyudayutsya ego zatmeniya vtoroi zvezdoi. Metod predlozhen davno, i davno uzhe primenyaetsya. Ob osnovah metodiki, osnovnyh rezul'tatah i planah kak raz mozhno uznat' iz etogo korotkogo obzora.
A eshe mozhno posmotret' animashki:
Authors: R.H. Sanders Comments: 35 pages, 13 figures, talk given at Second Aegean Summer School on the Early Universe Ocherednoi obzor po nablyudatel'noi kosmologii. Ego osobennost' sostoit v kriticheskom nastroe avtora, kotoryi vyiskivaet vozmozhnye problemy i sistematicheskie oshibki.
Authors: N.E. Mavromatos Comments: 29 pages, talk at `Neutrino-Oscillations in Venice 2003'', December 3-5 2003 Posle obzora nekotoryh podhodov k kvantovoi gravitacii avtor obsuzhdaet vozmozhnuyu fenomenologiyu. Ob astronomii neitrino vysokih energii sm. takzhe nedavnii obzor High-Energy Neutrino Astronomy.
Authors: Gilles Esposito-Farese Comments: 20 pages, LaTeX 2e, 7 postscript figures, contribution to 10th Marce Grossmann Meeting, 20-26 July 2003, Rio de Janeiro, Brazil Daetsya obzor ogranichenii, nakladyvaemyh nablyudeniyami dvoinyh radiopul'sarov, na razlichnye teorii gravitacii. Interesno, chto seichas samoe sil'noe ogranichenie daet ne teilorovskii pul'sar, a pul'sar v pare s belym karlikom. Odnako, yasno, chto v samom nedalekom budushem samoe sil'noe ogranichenie budet davat' sistema radiopul'sar+radiopul'sar, stavshaya superotkrytiem proshlogo goda.
Authors: C. Soubiran, A. Triaud Comments: 12 pages, accepted in A&A ELODIE - eto biblioteka podrobnyh zvezdnyh spektrov. Proanalizirovav ee dannye, avtory vydelyayut desyatku zvezd, naibolee pohozhih na Solnce. Pervoe mesto ostalos' za HD 146233 - eto samyi blizkii analog Solnca. Dobavilis' i novye, do etogo neissledovannye zvezdy. Sushestvenno, chto v vyborku popali dve zvezdy s planetami: HD095128 i HD186427.
Authors: A.N. Taylor et al. Comments:Submitted to MNRAS; 21 pages, 18 figures Postroeno trehmernoe (!) raspredelenie massy dlya sverhskopleniya A901/2, nahodyashegosya na krasnom smeshenii z=0.16. Takoi potryasayushii rezul'tat dostignut blagodarya izoshrennomu analizu dannyh o slabom linzirovanii dalekih istochnikov na etom skoplenii. Razumeetsya, osnovnoi vklad v massu daet temnoe veshestvo, a potomu raspredelenie massy po suti otrazhaet raspredelenie imenno temnoi materii.
Authors: S. Lebedev et al. Comments: Submitted to ApJ. For a version with figures go to http://web.pas.rochester.edu/~afrank/labastro/CW/Jet-Wind-Frank.pdf Privodyatsya rezul'taty laboratornyh eksperimentov so struyami plazmy. Issledovana rasfokusirovka strui poperechnym potokom veshestva. Vse eto imeet ochevidnye astrofizicheskie prilozheniya k dzhetam v aktivnyh yadrah galaktik i v molodyh zvezdah. Krome togo provedeno chislennoe modelirovanie kak eksperimenta, tak i astrofizicheskih dzhetov. Nablyudayutsya shodnye struktury, chto govorit o tom, chto my uzhe dostatochno horosho ponimaem mnogie aspekty fiziki astrofizicheskih strui.
Authors: Rachid Ouyed Comments: 8 pages, 1 figure. Submitted to New Astronomy Poskol'ku tochnoe povedenie veshestva pri vysokoi plotnosti neizvestno, ot teoretiki prodolzhayut razrabatyvat' razlichnye modeli. Dlya proverki etih postroenii mozhno ispol'zovat' kompaktnye ostatki evolyucii massivnyh zvezd - to, chto my nazyvaem "neitronnye zvezdy". V 60-e gg. Skirm (T. Skyrme) sozdal teoriyu pionnogo vzaimodeistviya. Etu model' inogda nazyvayut solitonnoi: bariony v nei yavlyayutsya topologicheskimi solitonami (imenno na osnove etoi modeli D'yakonov, Petrov i Polyakov predskazali v 1997 g. pentakvarki, sm. takzhe hep-ph/0009006 i bolee populyarnye materialy). Zdes' zhe avtor pytaetsya posmotret' kakie kompakntyne ob'ekty mozhno sozdat' na osnove modeli Skirma. Osnovnoe svoistvo takih skirmionnyh zvezd - bol'shaya massa (okolo 2 mass Solnca i dazhe chut' bol'she). Radius u takih ob'ektov tozhe chut' bol'she, chem u standartnoi neitronnoi zvezdy - okolo 15-16 km. Sredi neitronnyh zvezd izvestny ob'ekty s massoi bolee dvuh mass Solnca (naprimer, Vela X-1). Tak chto model' predstavlyaet interes. Verna li ona pokazhet budushee.
Authors: Ruth Durrer Comments: my course at the Second Aegean Summerschool on the Early Universe, 39 pages Lekcii po teorii kosmologicheskih vozmushenii. Esli by Vselennaya iznachal'no byla strogo odnorodnoi, to nablyudaemoi struktury seichas ne sushestvovalo by. Ne bylo by i nas s vami. Schitaetsya, chto poyavlenie krupnomasshtabnoi struktury svyazano s malymi nachal'nymi vozmusheniyami. Svoistva etih vozmushenii mozhno izuchat', naprimer, po dannym o mikrovolnovom reliktovom fone. V lekciyah opisyvaetsya sovremennaya teoriya kosmologicheskih vozmushenii. Izlozhenie idet na ochen' vysokom (t.e. slozhnom) urovne.
My budem starat'sya hotya by perechislit' interesnye (dlya shirokoi publiki)
stat'i, poyavivshiesya v razdele
physics
(vklyuchaya cross-listing).
Authors: G.E. Volovik Comments: JLTP style, 17 pages, 1 figure, prepared for Proceedings of conference Quantum Phenomena At Low Temperatures, Lammi, Finland, January 2004
Eto po suti obzornaya rabota.
Avtor dostatochno podrobno (i ponyatno) rasskazyvaet o turbulentnosti v
sverhtekuchei zhidkosti. Pozhalui, v etom obzore kak raz horosho sbalansirovano
kolichestvo teksta i formul, poetomu stat'ya dostupna lyubomu cheloveku s
tehnicheskim ili fizicheskim obrazovaniem, kotoryi eshe ne vse uspel zabyt'.
|
Publikacii s klyuchevymi slovami:
astro-ph - elektronnye preprinty
Publikacii so slovami: astro-ph - elektronnye preprinty | |
Sm. takzhe:
Vse publikacii na tu zhe temu >> |