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Formirovanie zvezdnoi massy galaktik na krasnyh smesheniyah ot 4 do 0 Nablyudeniya gamma-vspleskov na teleskope MAGIC: sostoyanie i perspektiv (i drugie stat'i po MAGIC) Konvertaciya svetimosti v linii H_alpha v temp zvezdoobrazovaniya Cherenkov Telescope Array: sleduyushee pokolenie nazemnyh gamma-observatorii
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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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Vypusk N168
astro-ph za 11-18 sentyabrya 2007 goda: izbrannye stat'i
Referaty otdel'nyh statei
Authors: Michele Cantiello, John P. Blakeslee Comments: ApJ accepted Na osnove mnogoletnih issledovanii slozhilos' predstavlenie, chto sharovye skopleniya (ShS) - otnositel'no prostye sistemy, v kotoryh zvezdy sformirovalis' prakticheski odnovremenno. No odnoi iz zagadok evolyucii ShS ostaetsya bimodal'nost' cvetovyh diagramm. Dlya ob'yasneniya etogo effekta prishlos' iskusstvenno predpolozhit', chto formirovanie ShS proishodilo s samoobogasheniem, t.e. samye massivnye zvezdy v oblake protoskopleniya evolyucionirovali bystro i obogashali mezhzvezdnuyu sredu tyazhelymi elementami, iz kotoroi uspevalo sformirovat'sya vtoroe pokolenie zvezd s bol'shei metallichnost'yu. V takom scenarii bimodal'nost' cvetovyh diagramm ShS - pryamoe sledstvie bimodal'nosti metallichnosti mezhzvezdnoi sredy protoskopleniya. Eta shema imeet mnogochislennye protivorechiya, poetomu predlagayutsya i drugie al'ternativnye varianty. V chastnosti, v dannoi rabote issleduetsya, kak budut vyglyadet' cvetovye diagrammy ShS v predpolozhenii nelineinogo sootnosheniya cvet-metallichnost'. V predpolozhenii edinogo gaussovogo raspredeleniya metallichnosti avtory raboty uverenno vosproizvodyat nablyudaemye bimodal'nye cvetovye diagrammy. Poskol'ku odnoznachnosti v interpretacii prirody bimodal'nosti po-prezhnemu net, vopros ostaetsya otkrytym.
Authors: M. Heydari-Malayeri Comments: 12 pages, paper presented at the Academia Europaea 19th Annual Conference "The Dialogue of Three Cultures and our European Heritage" (Toledo Crucible of the Culture and the Dawn of the Renaissance), 2 - 5 September 2007, Toledo, Spain. Chair, Organizing Committee: Prof. Manuel G. Velarde Istoricheskoe issledovanie, posvyashennoe svyazyam arabskoi (persidskoi) i evropeiskoi (ispanskoi, tochnee - andaluzskoi) astronomii.
Authors: E. V. Glushkova, S.E. Koposov, I.Yu. Zolotukhin Comments: submitted to A&A Seichas v astronomii zaicev mnogo, a ... issledovatelei malo. T.e., situaciya takova, chto est' ogromnoe kolichestvo horoshih dannyh, lezhashih v otkrytom dostupe, s kotorymi mozhno rabotat'. Naprimer, mozhno iskat' novye skopleniya. Dlya etogo nuzhno sozdat' horoshii soft - i vpered! Avtory ispol'zuyut svoi metod poiska rasseyannyh skoplenii. Kak vidno, metod ves'ma effektiven. V kachestve illyustracii avtory proveli poisk skoplenii v napravlenii galakticheskogo anticentra po dannym obzora 2MASS. Naideno 15 novyh skoplenii.
Authors: Tuneyoshi Kamae et al. Comments: 11 pages, 11 figures, 2 tables Opisan novyi detektor. Pervye polety zaplanirovany na 2010 god. Avtory nadeyutsya, chto s ego pomosh'yu mozhno budet sushestvenno prodvinut'sya v modelyah izlucheniya radiopul'sarov i v nekotoryh drugih oblastyah. Kak yasno iz nazvaniya stat'i, zapuskat' detektor budut na vysotnyh ballonah.
Authors: E. Sani, et al. Comments: 24 pages, 4 figures, accepted for publication in ApJ Privedeny rezul'taty infraktrasnoi VLT spektroskopii 5 yarkih ULIRGs (infrakrasnyh galaktik povyshennoi svetimosti), soderzhashih AGN (aktivnye galakticheskie yadra) v dvuh infrakrasnyh polosah L (3-4 mkm) i M (4-5 mkm). Nalichie pylevoi absorbiruyushei sredy na luche zreniya na AGN nezavisimo opredelyaetsya tremya nablyudatel'nymi faktorami: 1) naklonom kontinuuma AGN-komponenty, opredelyaemym prisutstviem pyli na luche zreniya; 2) absorbciei molekul PAHs na 3.4 mkm; 3) absorbciei SO v polose 4.5-5.0 mkm. V rabote pokazano, chto ULIRGs c nezatemnennymi pyl'yu AGN harakterizuyutsya ploskim kontinuumom i otsutstviem absorbcionnyh detalei na 3.4 i 4.6 mkm, a ULIRGs c zapylennymi AGN - kontinuumom s sil'nym naklonom i absorbciei molekulami PAHs i CO. Dokazano nalichie strogoi korrelyacii mezhdu naklonom kontinuuma i opticheskoi tolshoi v CO i, sledovatel'no, absorbciya v SO - tipichnaya cherta zapylennyh AGN. Naideno, chto v diapazone 3-4 mkm vklad AGN dominiruet, dazhe esli po sravneniyu s bolometricheskoi svetimost'yu galaktiki on neznachitelen.
Authors: Pablo G. Perez-Gonzalez et al. Comments: Accepted for publication in ApJ. 38 pages, 10 figures, 5 tables, 2 appendices Priveden rezul'tat obrabotki bolee ~28000 galaktik s cel'yu oharakterizovat' process akkumulyacii zvezdnoi massy v galaktikah na protyazhenii 12 mldr. let (krasnye smesheniya z =0 - 4). Avtorami oceneny fotometricheskie krasnye smesheniya, galakticheskie zvezdnye massy i tempy zvezdoobrazovaniya. Rezul'tat analiza naglyadno predstavlen na ris.6 v tekste stat'i. Sut' rezul'tatov v tom, chto naibolee massivnye galaktiki c s massami M/M_s > 10^12.0 sformirovalis' pervymi (t.n. " downsizing effect"), akkumulirovav bol'shuyu dolyu zvezdnoi massy v bystrom kollapse, soprovozhdaemom burnym zvezdoobrazovaniem na krasnyh smesheniyah z>3 (bolee 11 mlrd. let nazad). Galaktiki s massami v diapazone 10^11.5 < M/ M_s < 10^12.0 formirovalis' chut' medlennee, bolee poloviny ih zvezdnoi massy bylo sformirovano na krasnyh smesheniyah z > 1.5 (bolee 9 mlrd. let nazad). Nakonec, evolyuciya naimenee massivnyh galaktik s massami 10^9.0 < M/ M_s < 10^ 11.0 proishodila sovsem medlenno, polovina ih zvezdnoi massy sformirovalas' lish' k z <1 (bolee 7 mlrd. let nazad), a v techenie posleduyushih 4 mldr. let (z <0.4) proizoshlo znachitel'noe (na 20-40%) uvelichenie ih massy, predpolozhitel'no, za schet poglosheniya malo massivnyh galaktik-sputnikov. Rezul'taty dannogo analiza nahodyatsya v soglasii s predshestvuyushimi nablyudatel'nymi rabotami i teoreticheskimi modelyami.
Authors: Benedetta Ciardi Comments: 11 pages, 19 figures; invited review to appear in "First Stars III" Otlichnyi obzor Benedetty Ch'yardi o mehanicheskom, himicheskom i radiacionnom vliyanii pervyh zvezd i galaktik na formirovanie krupnomasshtabnoi struktury. Stat'ya mozhet byt' populyarnym vvedeniem v bolee ser'eznyi obzor teh zhe avtorov (Ciardi & Ferrara, 2005, Space Science Reviews, 116, 625).
Authors: D. Bastieri et al. Comments: Contribution to the 30th ICRC, Merida Mexico, July 2007 on behalf of the MAGIC Collaboration Na nazemnom gamma-teleskope MAGIC regulyarno provodyat poiski signala ot gamma-vspleskov. Poka, uvy, nichego ne obnaruzheno. No o tom, kakie est' plany i nadezhdy, mozhno prochest' v etoi stat'e. Statei po rezul'tatam MAGIC poyavilas' massa. O nablyudeniyah gamma-vspleskov na MAGIC sm. takzhe arxiv:0709.1386. O poiske tau-neitrino - arxiv:0709.1462. Ob otkrytii zhestkogo gamma ot 3S 279 - v arxiv:0709.1475. O monitoringe blazarov - tut. O registracii izlucheniya ot BL Lac v 0709.2265, O nablyudeniyah drugoi lacertidy, provedennyh sovmestno s rentgenovskimi sputnikami, chitaite v sleduyushei stat'e. O nablyudeniyah vo vremya sumerek i pri lunnom svete chitaite zdes'. O nablyudeniyam mikrokvazarov - v 0709.2288. O poiskah istochnikov kosmicheskih luchei sverhvysokih energii - zdes'. O testovyh progonah v ramkah podgotovki k sovmestnym nablyudeniyam s neitrinnymi proektami mozhno prochest' zdes'. O tehnologii, ispol'zuemoi pri sozdanii zerkala MAGIC-II (bolee krupnoi i sovremennoi versii, vtoroi teleskop budet stoyat' ryadom s pervym, i oni budut rabotat' v pare) mozhno prochest' zdes': arxiv:0709.1372. Kamera, kotoraya budet ustanovlena na MAGIC-II, opisana v arxiv:0709.2474 O statuse postrioki vtorogo teleskama sm. 0709.2605. Apgreidu teleskopa posvyashena stat'ya arxiv:0709.2363. Eshe o tehnicheskih aspektah raboty MAGIC sm. arxiv:0709.1410, arxiv:0709.1574, arxiv:0709.1694, arxiv:0709.2052.
Authors: Veronique Van Elewyck, for the Auger Collaboration Comments: 8 pages, 4 figures. Prepared for the proceedings of the 42nd Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, Italy, 10-17 Mar 2007 Ocherednoi "dezhurnyi" otchet o sostoyanii del na observatorii im. P'era Ozhe. Hotya osobyh novostei net, no vvidu vazhnosti temy obrashayu vashe vnimanie (takzhe mozhno posmotret' i arxiv:0709.250094 na tu zhe temu). O rabote toi, chasti Observatorii, kotoraya sostoit iz 1600 nazemnyh cherenkovskih detektorov, mozhno prochest' tut. Takzhe sm. 0709.2125, gde rech' idet o tom naskol'ko akkuratno eti detektory vosstanavlivayut svoistva pervichnoi chasticy.
Authors: Jan Pflamm-Altenburg et al. Comments: Accepted by ApJ Dlya ocenki tekushego tempa zvezdoobrazovaniya (ZO) v galaktikah shiroko ispol'zuetsya lineinoe sootnoshenie mezhdu svetimost'yu v linii H_alpha i tempom ZO, predlozhennoe dlya spiral'nyh galaktik v rabote Kennicutt et al (1994). Takoi pereschet osnovan na predpolozhenii o neizmennosti NFM zvezd i ee nezavisimosti ot tempa ZO. Avtory dannoi raboty pokazyvayut, chto vstrechayushayasya v literature ekstrapolyaciya dannogo sootnosheniya na oblast' karlikovyh galaktik privodit k nedoocenke tempa ZO v etih galaktikah na tri poryadka, poskol'ku dlya malyh svetimostei v linii H_alpha lineinost' zakona narushaetsya. Ne isklyucheno, chto utochnenie dannoi zavisimosti povlechet za soboi peresmotr obshego ponimaniya o tom, kak proishodit zvezdoobrazovanie v karlikovyh galaktikah i, sledovatel'no, peresmotr kosmologicheskoi istorii zvezdoobrazovaniya v celom.
Authors: Stephen E. Healey, et al. Comments: 18 pages, 6 figures, accepted for publication in ApJS Lyudi prodolzhayut gotovit'sya k zapusku GLAST. V dannoi stat'e predstavlen katalog yarkih blazarov, kotorye, kak mozhno ozhidat', okazhutsya yarkimi i v gamma-diapazone. Otbor proizvodilsya v pervuyu ochered' po radiospektram. Vsego v spisok voshlo 1625 ob'ektov, kotorye dostatochno ravnomerno raspredeleny po nebu (krome, konechno, polosy vdol' Mlechnogo Puti). Tablicu s dannymi mozhno skachat' zdes'. Takzhe teme gamma-blazarov, no uzhe v svyazi s nablyudeniyami na AGILE i MAGIC, posvyashena stat'ya 1881.
Authors: J.P. Willis, et al. Comments: 7 pages, MNRAS accepted ZEN oznachaet " z equals 9". Eto special'nyi obzor, posvyashennyi poisku ochen' dalekih galaktik s emissiei v linii Ly-alpha v uzkopolosnom infrakrasnom fil'tre J na 1.187 mkm. Dlya togo, chtoby liniya Ly-alpha smestilas' v J-fil'tr za schet krasnogo smesheniya, galaktiki dolzhny nahodit'sya gde-to na z=8.8 Avtory iskali ochen' udalennye galaktiki v pole treh galakticheskih skoplenii ( Abel 1689, 1835 i 114), kazhdoe ih kotoryh deistvuet kak gravitacionnaya linza, uvelichivaya shansy obnaruzhit' kandidatov. No ni v odnom iz treh polei galaktik-kandidatov na z ~9 obnaruzheno ne bylo.
Authors: B.P. Wakker, et al. Comments: Accepted by ApJ Horosho izvestno, chto galaktiki - otkrytye sistemami. Oni aktivno akkreciruyut gaz iz mezhgalakticheskoi sredy ( HVC, IVC ) i vymetayut sobstvennyi mezhzvezdnyi gaz posredstvom galakticheskogo vetra ("galakticheskie fontany" i t.d.). Analiz etih processov, stol' vazhnyh dlya ponimaniya dinamicheskoi i himicheskoi evolyucii galaktik, nevozmozhen bez nablyudenii. S etoi cel'yu na VLT nablyudalis' 24 udalennye zvezdy Galaktiki s izvestnymi rasstoyaniyami. Analiz mezhzvezdnoi absorbcii na luche zreniya v spektrah etih zvezd pozvolil ocenit' diapazon rasstoyanii do interesnyh chetyreh oblakov s massami poryadka M~ 10^5 solnechnyh mass. Okazalos', chto oblako " Cohen Stream" nahoditsya na rasstoyanii ot 5.0-11.7 kps i vmeste s oblakom " complex GCP" (rasstoyanie 9.8-15.1 kps) dvizhetsya v napravlenii Galaktiki. Oblaka zhe "Fountain in Perseus Arm" (rasstoyanie 1.0-2.7 kps) i "cloud g1" (1.8-3.8 kps) yavlyayutsya galakticheskimi fontanami.
Authors: G. Hermann, et al. Comments: 4 pages, 3 figures, to appear in the proceedings of the 30th International Cosmic Ray Conference, Merida, July 2007 Krome SKA - gigantskoi antennoi reshetki, rabotayushei v radio - planiruyut stroit' i krupnye sistemy nazemnyh gamma-teleskopov. Ideya, na pal'cah, dostatochno prostaya. Voz'mem ne 4 teleskopa (kak v chrezvychaino uspeshnom H.E.S.S.), a gorazdo bol'she. Dobavim novye tehnologii - i poluchim superinstrument. Na samom deel, konechno, vse slozhnee. V chastnosti, nado detal'no prorabatyvat' nauchnuyu programmu i tp. Etim seichas i zanimaetsya bol'shaya mezhdunarodnaya gruppa uchenyh. Prochitat' pro eto mozhno v stat'e, a mozhno na saite proekta CTA (Cherenkov Telescope Array).
Obsudit' v ZhZh-soobshestve
ru_astroph
Authors: Jane H. MacGibbon, B. J. Carr, Don N. Page Comments: 32 pages, 3 figures Nekotoryi avtory polagayut, chto v raschetah izlucheniya isparyayushihsya chernyh dyr vazhen uchet fotosfery. V dannoi stat'e avtory issleduyut etot vopros i prihodyat k vyvodu, chto fotosfera ne obrazuetsya. Sm. takzhe vtoruyu stat'yu teh avtorov.
Authors: Diego Gotz Comments: 6 pages, 1 figure, proceedings of the Cefalu Astrophysical Conference, 11-24 June 2006, AIPC, 924, 44, 2007 Opisyvaetsya proekt ECLAIRs, prednaznachennyi dlya izucheniya gamma-vspleskov i planiruemyi k zapusku v 2011 godu. Odnoi iz otlichitel'nyh chert yavlyaetsya ochen' bystraya i kachestvennaya bortovaya obrabotka informacii, chto pozvolit vydavat' horoshie oblasti lokalizacii za sekundy.
Authors: T. Shahbazet al. Comments: 5 pages, 4 figures, accepted by ApJ Predstavleny polyarimetricheskie nablyudeniya treh rentgenovskih dvoinyh (Sco X-1, Cyg X-2, GRS1915+105) v blizhnem IK diapazone. Dlya vseh treh polyarizciya obnaruzheno, no dlya GRS1915+105 ona mozhet byt' svyazana s vozdeistviem mezhzvezdnoi sredy, a dlya dvuh drugih - net. Avtory polagayut, chto prichinoi polyarizacii mozhet byt' sinhrotronnyi mehanizm izlucheniya. Togda, my zaglyadyvaem v samuyu vnutrennyuyu oblast' dzheta, glubzhe, chem eto mozhno sdelat' v radiodiapazone!
My budem starat'sya hotya by perechislit' interesnye (dlya shirokoi publiki) stat'i, poyavivshiesya v razdele physics (vklyuchaya cross-listing).
Authors: Erasmo Recami, Salvatore Esposito Comments: paper of 28 pages (in English). A finished, enlarged version of this artice will appear as the editors' Preface, at the beginning of the coming book "Ettore Majorana - Unpublished Research Notes on Theoretical Physics", edited by S.Esposito, E.Recami, A.van der Merwe and R.Battiston, to be printed by Springer verlag, Berlin Avtory dayut obzor neopublikovannyh zametok Maiorany (chast' iz nih byla neskol'ko let nazad izdana sovremennymi issledovatelyami istorii nauki, chast' gotovitsya k publikacii).
Authors: Erasmo Recami et al. Comments: 80 pages: in Italian, but with 51 self-explanatory photographs in color, and 19 black-and-white sketches, of the 178 Scientific Instruments of Historical Interest for Physics here catalogued and described. ournal-ref: "Gli Strumenti Scientifici di Interesse Storico del 'Lussana', del 'Vittorio Emanuele', e del 'Quarenghi' di Bergamo" (Tipolito Castell; Bergamo, 2002)
Bol'shoi tekst na ital'yanskom, posvyashennyi opisaniyu staryh nauchnyh priborov,
nahodyashihsya v treh ital'yanskih kolledzhah v Bergamo (kolledzh-vozmozhno, ne
luchshii variant perevoda, no on otrazhaet sut'). Instrumenty ne obyazatel'no
"vremen Galileo", no est' i v samom dele starinnye. Privedeno mnogo
illyustracii, tak chto stoit obratit' vnimanie.
Authors: Ivan Todorov Comments: 12 pages, PDF Nebol'shaya zametka, posvyashennaya biografii Gedelya i ego filosofskim interesam.
Authors: J. Harnad Comments: 5 pages, book review Kriticheskaya recenziya na knigu Smolina "Trudnosti s fizikoi". Po-moemu, kommentarii recenzenta spravedlivy.
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