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Millisekundnyi dvoinoi pul'sar s ekscentrichnoi orbitoi v ploskosti Galaktiki Gigantskii disk iz holodnogo gaza vokrug blizkoi moshnoi radiogalaktiki NGC 612 (PKS 0131-36) Sverhnovaya, porodivshaya Kassiopeyu A, otnosilas' tipu IIB
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
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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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Referaty otdel'nyh statei
Authors: Yi-Zhong Fan, Tsvi Piran Comments: 24 pages, An invited review article for Front. Phys. China. (Possible prompt and very early GeV-TeV emission from GRB 080319B are discussed in Sec. V) Hotya gamma-vspleski i nazyvayutsya gamma-vspleskami, no v samom dele zhestkoe gamma-izluchenie ot nih nablyudaetsya ne tak uzh chasto. Odnako est' neskol'ko primerov obnaruzheniya gamma-vspleskov na energiyah >20 MeV. V preddverii zapuska sputnika GLAST avtory summiruyut predydushie nablyudeniya i delayut nekotorye predskazaniya.
Authors: I. F. Mirabel Comments: Review based on courses given at international schools for graduate students and post-docs; 13 pages, 7 color figures Nebol'shoi obzor po gruppe tesnyh dvoinyh sistem, v kotoryh pri akkreciyu na chernye dyry (hotya, pohozhe, est' sistemy i s neitronnymi zvezdami) voznikayut relyativistskie vybrosy (strui), za chto sistemy i prozvali mikrokvazarami.
Authors: D. J. Champion et al. Comments: 28 pages, 4 figures inc Supplementary On-Line Material. Accepted for publication in Science, published on Science Express: 10.1126/science.1157580 Obnaruzhen interesnyi dvoinoi millisekundnyi pul'sar. Po otdel'nosti ego svoistva ne byli by stol' interesny, no ih kombinaciya zadaet zagadki. Eto millisekundnyi (2.15 msek) pul'sar, u kotorogo kompan'onom yavlyaetsya normal'naya zvezda solnechnoi massy, pri etom orbita imeet vysokii ekscentrisitet (0.44) i bol'shoi period (95 dnei), a nahoditsya sistema v ploskosti Galaktiki. Krome togo, ocenka massy neitronnoi zvezdy daet 1.7-1.8 mass Solnca (no eta velichina eshe mozhet, na moi vzglyad, preterpet' pereocenku). Zagadka v tom, chto standartnye evolyucionnye shemy ne dayut takih sistem. Est' neskol'ko variantov ekzotichnosti, obsuzhdaemyh avtorami. Pervyi: pul'sar takim i rodilsya. Vtoroi: eto byla troinaya sistema. Tretii: pul'sar popal v ploskost' Galaktiki iz sharovogo skopleniya. Scenarii s troinoi vyglyadit naibolee privlekatel'nym.
Authors: Vincent Minier et al. Comments: 19 pages, 2nd ARENA Conference: The Astrophysical Science Cases at Dome C, Potsdam : Allemagne (2006) Avtory obsuzhdayut usloviya na ploshadke Dome C v Antarktide s tochki zreniya ustanovki bol'shogo instrumenta, rabotayushego v oblasti 100 - 1000 mikron. Takoi instrument dolzhen zanyat' mesto mezhdu kosmicheskim proektom Gershel' (60-500 mikron) i nazemnoi ustanovkoi ALMA (350 mikron - 7 mm). U Gershelya budet malaya sobirayushaya ploshad', a ALMA budet imet' malen'koe pole zreniya (da i usloviya nablyudenii budut ne ideal'ny). S tochki zreniya uslovii nablyudenii mozhno stavit' pribory na sharah ili samoletah, no luchshe, konechno, naiti chto-to podhodyashee na Zemle. Vyvod avtorov sostoit v tom, chto Dome C luchshee v mire mesto dlya takogo teleskopa. Krome togo, obsuzhdayutsya nauchnye zadachi dlya takogo instrumenta (zvezdoobrazovanie, formirirovanie i rannyaya evolyuciya galaktik, malye tela v solnechnoi sisteme i tp.).
Authors: Andrea Merloni, Sebastian Heinz Comments: 22 pages, 14 color figures. Accepted for publication in MNRAS Avtory stroyat evolyucionnuyu populyacionnuyu model' dlya aktivnyh yader galaktik. Napomnim, chto populyacionnyi sintez yavlyaetsya populyarnym metodom v sovremennoi astrofizike, v tom chisle i pri izuchenii aktivnyh yader galaktik. Avtory pytayutsya, poka vozmozhno, osnovyvat'sya na nablyudeniyah, a ne zadavat' kakie-to zavisimosti i korrelyacii rukami. Modeliruetsya evolyuciya funkcii svetimosti AYaG s krasnym smesheniem.
Authors: R.P. Mignani, G.G. Pavlov, O. Kargaltsev Comments: 5 pages, 4 figures, submitted to A&A Avtory raportuyut o vozmozhnom obnaruzhenii v opticheskom diapazone blizkogo (130 pk) starogo (166 millionov let) radiopul'sara. Vse govorit o teplovom izluchenii (T=90 000K) vsei poverhnosti (R=13 km) neitronnoi zvezdy. Esli eto i v samom dele tak, to eto ves'ma interesno, t.k. standartnye modeli ohlazhdeniya (bez dopolnitel'nyh istochnikov tepla, naprimer iz-za raspada magnitnyh polei ili vnutrennego treniya) ne dayut takie temperatury dlya stol' staryh ob'ektov.
Authors: Duncan A. Forbes Comments: 6 pages, accepted for publication in Mercury Dovol'no zabavnaya pamyatka-putevoditel' dlya teh, kto hochet stat' astronomom. V osnovnom eto dlya studentov, prichem v osnovnom ne dlya nashih, no i nashi naidut tam koe-chto poleznoe (i ne tol'ko studenty).
Authors: B.H.C. Emonts et al. Comments: 13 pages, 9 figures. MNRAS in press Po nablyudeniyam na ATCA (Australia Telescope Compact Array) obnaruzheno, chto blizkaya linzovidnaya galaktika NGC 612, soderzhashaya odin iz blizkih moshnyh radioistochnikov (PKS 0131-36), pogruzhena v gigantskii (140 kpk) disk holodnogo neitral'nogo vodoroda. Massa diska slegka prevoshodit milliard solnechnyh mass. Izuchenie diska pozvolyaet takzhe sdelat' vyvod o tom, chto u etoi galaktiki est' ochen' massivnoe galo temnoi materii.
Authors: James Bock et al. (for the EPIC Science and Technology Teams) Comments: 196 pages V NASA razrabatyvayutsya proekty, kotorye mogli by dat' informaciyu ob inflyacionnoi stadii vselennoi (esli ona byla). Vidimo, edinstvennyi real'nyi put' v blizhaishee vremya - detal'noe izuchenie polyarizacii reliktovogo izlucheniya. V kakom-to ob'eme takie izmereniya mozhno provodit' s Zemli (i eto delaetsya). Odnako kosmicheskii proekt nesravnenno luchshe. Sputnik Planck, zapuskaemyi v etom godu, budet pervym shagom v dannom napravlenii. No nuzhny bolee sovershennye apparaty. V ramkah proekta Einstein Probes budet sdelano tri missii: The Joint Dark Energy Mission (JDEM), Inflation Probe, Black Hole Finder Probe. Obsuzhdaemyi v dannoi stat'e proekt EPIC - eto odin iz variantov Inflation Probe. Poka idet pervaya faza prorabotki proekta. T.e., rassmatrivayutsya raznye varianty komponovki (chto vlechet raznuyu stoimost' proektov), izuchayutsya neobhodimye tehnologii, rassmatrivaetsya, kak budet vliyat' fon i tp. Material horosh tem, chto daetsya ponyatnyi obzor po raznym aspektam, svyazannym s zadachami proekta. Sovetuyu prochitat' stranicy 8-18 i 31-34 (nomera stranic po poryadku, a ne soglasno ih napechatannym nomeram, dlya poslednih eto 1-11 i 24-27). V vysokom razreshenii stat'ya dostupna zdes'.
Authors: C. Espaillat, J. Bregman, P. Hughes, E. Lloyd-Davies Comments: 34 pages, 15 figures, ApJ, 679:182-193, 2008 May 20 QPO- eto kvaziperiodicheskie oscillyacii. T.e., v izmenenii potoka izlucheniya ot istochnika est' kakoi-to ne slishkom chetkii, no dostatochno stabil'nyi periodicheskii process. Est' raznye tipy QPO i raznye modeli. Prakticheski vsegda rech' idet o diskovoi akkrecii na neitronnye zvezdy i chernye dyry. Esli akkreciya idet na chernuyu dyru, to u diska est' vnutrennyaya granica, t.k. nachinaya s nekotorogo rasstoyaniya net ustoichivyh orbit, t.e. disk ne mozhet podoiti pryamo k gorizontu. Rasstoyanie zavisit ot massy chernoi dyry i ee vrasheniya. V prosteishem sluchae medlenno vrashayusheisya dyry mozhno poluchat' ocenku massy. No mogut byt' i drugie modeli. Naprimer, eto mogut byt' kakie-to gidrodinamicheskie neustoichivosti v diske. Poka QPO nablyudalis' tol'ko v tesnyh dvoinyh sistemah, t.e. ni odnogo sluchaya dostovernogo QPO u aktivnyh yader galaktik ne bylo naideno (pravda, est' kvaziperiod u chernoi dyry v centre nashei Galaktiki, no eto uzhe drugaya istoriya). Avtory predstavlyayut analiz, soglasno kotoromu u pervogo identificirovannogo kvazara 3C273 (umestno upomyanut', chto Martin Shmidt 28 maya etogo goda poluchil premiyu Kavli za otkrytie kvazarov) est' kvazaperiod. Esli schitat', chto eto period obrasheniya po poslednei ustoichivoi orbite, to ocenka massy poluchaetsya ot 7.3 milliona mass solnca do 81 milliona (pri maksimal'nom vrashenii). Odnako rannie ocenki massy chernoi dyry po metodu reverberacionnogo kartirovaniya davali sushestvenno bolee vysokuyu ocenku - 235 millionov mass solnca. Znachit, pishut avtory, vozmozhno, chto nablyudaemye QPO - eto kakie-to kolebatel'nye mody v diske, a ne period na vnutrennei ustoichivoi orbite (nu, ili ocenka po reverberacionnomu kartirovaniyu ne verna).
Authors: Rob Fender, the LOFAR Transients Key Science Project Comments: 11 pages, In "Bursts, Pulses and Flickering: wide-field monitoring of the dynamic radio sky", Tzioumis, Lazio & Fender (Eds), Proceedings of Science, 2007 LOFAR - novyi kompleks nizkochastotnyh radioteleskopov, kotoryi dolzhen vstupit' v stroi v blizhaishie gody (tochnee, stancii budut postepenno sooruzhat'sya v neskol'kih evropeiskih stranah, a pervaya uzhe rabotaet). V stat'e privoditsya kratkii obzor proekta i perechislyayutsya osnovnye zadachi. Zatem avtory koncentriruyutsya na odnoi iz nih - monitoringe neba s cel'yu obnaruzheniya vspyhivayushih (tranzientnyh) ob'ektov. Provodit' nablyudeniya tranzientnyh ob'ektov v radio ochen' trudno, na nizkih chastotah osobenno. Esli LOFAR zarabotaet kak nado, to mozhno ozhidat' ochen' interesnyh otkrytii.
Authors: G. Chartas, C. S. Kochanek, X. Dai, S. Poindexter, G. Garmire Comments: 20 pages, includes 8 figures, submitted to ApJ Ne ustayu udivlyat'sya, kakie vozmozhnosti daet gravitacionnoe mikrolinzirovanie dlya izucheniya nerazlichimyh s pomosh'yu sovremennyh priborov ob'ektov. Ideya prosta, prodstav'te sebe linzirovanie dalekogo kvazara: est' kvazar, est' my, a mezhdu nami galaktika, vystupayushaya v roli linzy. No v etoi galaktike est' zvezdy. I oni mogut davat' effekt mikrolinzirovaniya. Istochnikom v dannom sluchae yavlyaetsya akkrecionnyi disk vokrug sverhmassivnoi chernoi dyry v kvazare. V rezul'tate, my mozhem poluchat' ocenki razmera izluchayushei chasti diska. Eto ispol'zovalos' dlya proverki modelei diska (model' Shakury-Syunyaeva horosho podhodit), dlya izucheniya korrelyacii razmera diska s massoi cherynoi dyry i t.d. V ocherednoi stat'ei avtory izuchayut linzirovanie v rentgenovskom diapazone, chto dovol'no netrivial'no. Mozhno ocenit' razmer izluchayushei oblasti. Rezul'tat (menee 6 gravradiusov) nalagaet sushestvennye ogranicheniya na modeli koron diskov v aktivnyh yadrah.
Authors: Z. Eker et al. Comments: 5 pages, including 2 figures and 3 tables, accepted for publication in MNRAS Sam katalog, konechno zhe, dostupen po seti na saite CDS, a v stat'e dano kratkoe opisanie. V katalog vhodit 409 sistem, iz kotoryh polovina - novye otozhdestvleniya.
Authors: Oliver Krause et al. Comments: 17 pages, 4 figures, including online supporting material; to be published in Science on 30 May 2008 Ostatok sverhnovoi Kassiopeya A yavlyaetsya odnim iz samyh molodyh v Galaktike. V ego centre nablyudaetsya zagadochnyi kompaktnyi ob'ekt. Vse vremya idut spory o tom, k kakomu tipu otnosilas' sverhnovaya, porodivshaya ostatok i kompaktnyi ob'ekt. Avtory analiziruyut opticheskii spektr, poluchennyi po nablyudeniyam svetovogo eha. Ideya sostoit v tom, chto my mozhet seichas nablyudat' otrazhenie samogo vzryva, i po spektru opredelit' tip sverhnovoi. Analiz pokazal, chto vzorvalos' gelievoe yadro krasnogo giganta. T.e., sverhnovaya otnosilas' k tipu IIB. Sm. takzhe arxiv:0805.4607, gde drugaya gruppa nablyudatelei takzhe privodit novyi dannye po ostatku Cas A.
Authors: Jason X. Prochaska, Jason Tumlinson Comments: Proceedings Review for "Astrophysics in the Next Decade: JWST and Concurrent Facilities", ed. X. Tielens, 38 pages, 10 color figures Bol'shoi obzor, posvyashennyi voprosu o tom, gde nahodyatsya bariony na raznyh krasnyh smesheniyah, i kak ih mozhno nablyudat'. Istoriya nachinaetsya s epohi reionizacii, a osoboe vnimanie udeleno krasnym smesheniyam 3, 1 i 0.
Authors: Sebastien Lepine et al. Comments: 5 pages, To appear in proceedings of IAU Symposium No. 248 - A Giant Step: from Milli- to Micro-arcsecond Astrometry, Shangai : China (2007) Avtory kratko opisyvayut novyi katalog zvezd s bol'shimi (>0.15 sekund v god) sobstvennymi dvizheniyami. Katalog pokryvaet vse nebo. Pravda, avtory ne opisyvayut, gde katalog skachat'.
Authors: I. Dillmann, M. Heil, F. Kppeler, R. Plag, T. Rauscher, F.-K. Thielemann Comments: 5 pages Conference Proccedings "CGS12", Notre Dame/ USA (4.-9. Sep. 2005) A vot eti avtory privodyat ssylku na svoyu bazu. I opisyvayut ee v neskol'kih zametkah (arxiv:0805.4755, arxiv:0805.4747, arxiv:0805.4756). V baze privodyat eksperimental'nye dannye po secheniyam, aktual'nym dlya raschetov s- i p-processov.
Authors: The LIGO Scientific Collaboration: B. Abbott, et al Comments: 6 pages, 1 figure Po rezul'tatam neskol'kih mesyacev nablyudenii komanda LIGO smogla postavit' pryamoi (t.e. poluchennyi po dannym gravvolnovogo detektora) predel na gravizluchenie ot pul'sara v Krabe. I predel etot luchshe kosvennogo predela, poluchennogo po detal'nomu taimingu pul'sara. S odnoi storony, rezul'tat nulevoi. S drugoi - LIGO eshe raz pokazyvaet, chto predely, ustanavlivaemye etim eksperimentom, luchshe kosvennyh.
My budem starat'sya hotya by perechislit' interesnye (dlya shirokoi publiki) stat'i, poyavivshiesya v razdele physics (vklyuchaya cross-listing).
Authors: Thomas P. Sotiriou, Valerio Faraoni Comments: 47 pages, review commissioned by Rev. Mod. Phys; Bol'shoi obzor po stavshim populyarnymi f(R) teoriyam gravitacii. Lyudi davno pytayutsya rasshirit' OTO, sobstvenno, s momenta ee poyavleniya byli popytki kak-to ee uluchshit', da i pri svoem rozhdenii OTO byla okruzhena konkurentami. f(R) teorii osnovyvayutsya na modifikacii deistviya Gil'berta-Einshteina putem zameny skalyara Richi na bolee obshuyu funkciyu (sm. formulu 3 na str. 3 v obzore), prichem f(R) chatso predstavlyayut v vide ryada, sohranyaya chleny do opredelennogo poryadka. Dal'neishie detali - v obzore.
Authors: K. Yamamoto et al. Comments: 8 pages, 9 figures, Amaldi7 proceedings, J. Phys.: Conf. Ser. CLIO - Cryogenic Laser Interferometer Observatory. Eto prototip yaponskogo proekta LCGT (Large-scale Cryogenic Gravitational Telescope). On nahoditsya v shahte Kamioka, gde budet stroit'sya i LGCT. CLIO - nebol'shoi proekt, dlina plecha vsego lish' 100 metrov. Sootvetstvenno, ego zadachi ne nauchnye, a tehnicheskie. Poka prototip uspeshno otrabotal pri komnatnoi temperature, a pri rabote v rezhime s ohlazhdeniem vyyavilis' problemy. Obo vsem etom i blizhaishih planah - v stat'e.
Authors: Bryce DeWitt Comments: 9 pages, 2 figures, 31 references. Accepted by GRG Publikuetsya ranee neizvestnyi tekst Bryusa DeVitta, umershego chetyre goda nazad. Tekst byl obnaruzhen v zapisyah uchenogo bez ukazaniya togo, dlya chego on byl napisan. Zapiska posvyashena istorii kvantovoi gravitacii i nekotorym osnovnym koncepciyam.
Obsudit' v ZhZh-soobshestve
ru_astroph.
Authors: Mary K. Gaillard, Bruno Zumino Comments: 18 pages. To be published in `Supersymmetry on the Eve of the LHC'', a special volume of the European Physical Journal C (EPJC) dedicated to the memory of Julius Wess Nebol'shoi obzor po supersimmetrii, superstrunam i istorii razvitiya etih napravlenii. Ne skazat', chto stat'ya legkodostupna, no mnogie veshi neizbezhno napisany dostatochno prosto, po krainei mere dlya fizikov i primknuvshih k nim.
Authors: Qiang Wu Comments: 7 pages, 3 tables
Etot kitaec ot skromnosti ne umret! :)
Sut' indeksa kraine prosta: w=1, esli u cheloveka est' 10 statei s citiruemost'yu bol'she 10. Indeks raven 2, esli est' 20 statei s citiruemost'yu vyshe 20. U Vittena, skazhem, etot indeks 41, t.e. u Vittena 410 statei s citiruemost'yu vyshe 410. T.o., indeks ceplyaet samyi top statei. Stat'ya zhe interesna tablicei, gde sravnivaetsya mnogo raznyh indeksov, a potom smotryatsya korrelyacii mezhdu nimi.
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