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| 25.07.02. astro-ph za 22-25 iyulya 2002 goda: izbrannye stat'i |
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Vot i dolgozhdannyi obzor po gelioseismologii! Imenno nablyudeniya kolebanii solnechnoi poverhnosti dayut unikal'nuyu vozmozhnost' zaglyanut' v solnechnye nedra (neitrinnaya astronomiya vse-taki poka ne dostigla uglovogo razresheniya, pozvolyayushego vpryamuyu smotret' vnutr' Solnca v detalyah). V obzore daetsya podrobnoe opisanie vsego, dostignutogo gelioseismologiei na nastoyashie moment. Nu a na russkom rekomenduyu privedennuyu vyshe ssylku.
Authors: L.J. Tacconi et al. Comments: accepted to be published in ApJ, 7 figures ULIRGs - ultra-luminous infrared galaxies. Kak pravilo eto slivayushiesya galaktiki. S nimi svyazano mnogo vsyakih interesnyh yavlenii (k primeru, byli raboty, gde klastery kosmicheskih luchei sverhvysokih energii otozhdestvlyali s takimi galaktikami (Giller et al. 2002)). V stat'e avtory predstavlyayut rezul'taty novyh nablyudenii. Teper' est' horoshie dannye po 18 ULIRGs. Prichem vosem' iz nih soderzhat aktivnye yadra, kotorye avtory nazyvayut "kvazaropodobnymi" (poluchaetsya smeshnaya tavtologiya: kvazar eto ved' zvezdopodobnyi ob'ekt). V svyazi s etim Tacconi i dr. obsuzhdayut vopros: ne yavlyayutsya li ULIRGs predshestvennikami kvazarov? Otvet daetsya otricatel'nyi. ULIRGs ne mogut prevratit'sya v opticheski yarkie kvazary. Skoree vsego oni predshestvenniki bolee menee obychnyh ellipticheskih galaktik, kotorye, odnako, mogut proyavlyat' aktivnost' v rentgenovskom diapazone.
Authors: Eric W. Greisen, Mark R. Calabretta Comments: 15 Pages, 1 figure, LaTex with Astronomy & Astrophysics macro package, submitted to A&A, related papers at http://www.aoc.nrao.edu/~egreisen astro-ph/0207413 Representations of celestial coordinates in FITS Authors: Eric W. Greisen, Mark R. Calabretta Comments: Consequent to Paper I: "Representations of world coordinates in FITS". 45 pages, 38 figures, 13 tables, aa macros v5.2 (2002/Jun). Both papers submitted to Astronomy & Astrophysics (2002/07/19). Replaced to try to get figure and table placement right (no textual changes) V dvuh stat'yah avtory obsuzhdayut FITS format. Predlagaetsya novyi metod proektirovaniya nebesnyh koordinat na dvumernuyu ploskost' izobrazheniya. Sootvetstvenno, stat'ya mozhet byt' interesna vsem, rabotayushim s dannym formatom.
Authors: Caleb A. Scharf, Reshmi Mukherjee Comments: Accepted ApJ, 26 pages, 9 figures, figures 1,2, and 3 are bitmapped Na proshloi nedele uzhe byla stat'ya, posvyashennaya gamma-izlucheniyu ot skoplenii galaktik. I vot eshe odna. V etoi rabote avtory ishut korrelyacii mezhdu dannymi EGRET i Abelevskimi skopleniyami. Rezul'taty govoryat o nalichii takovyh na urovne bol'shem treh standartnyh otklonenii. Takzhe avtory vyskazyvayut uverennost', chto budushie missii (GLAST) smogut vpryamuyu registrirovat' izluchenie ot skoplenii (sm. takzhe stat'yu astro-ph/0207514, posvyashennuyu neteplovomu izlucheniyu skoplenii galaktik).
Authors: Umin Lee, Shijun Yoshida Comments: 20 pages, 12 figures. To appear in ApJ Neskol'ko let nazad, v 1998 g., bol'shoe vnimanie specialistov privlekli t.n. r-mody neustoichivosti, voznikayushei v molodyh vrashayushihsya neitronnyh zvezdah. Pri etom izluchayutsya gravitacionnye volny i, sootvetstvenno, zamedlyaetsya vrashenie neitronnoi zvezdy. Takaya neustoichivost' mogla by byt' opredelyayushei pri formirovanii raspredeleniya nachal'nyh periodov vrasheniya neitronnyh zvezd. Odnako, usloviya vozniknoveniya neustoichivosti, intensivnost' izlucheniya i t.p. voprosy v prilozhenii k real'nym neitronnym zvezdam ostayutsya neizvestnymi v svyazi s tem, chto neizvestny s bol'shoi tochnost'yu parametry veshestva v neitronnyh zvezdah. V dannoi stat'e avtory issleduyut problemu v sluchae nalichiya sverhtekuchekogo yadra. Pokazano, chto mogut sozdavat'sya usloviya, kogda r-mody stanovyatsya neustoichivymi.
Authors: Alfred Krabbe, Sean C. Casey Comments: Invited talk presented at SPIE conf. on Infrared Spaceborne remote Sensing X, Seattle, July 2002, 13 pages, to be published in SPIE vol. 4818 V ideale vse teleskopy hotelos' by zapustit' v kosmos, no eto dorogo, naprimer, Habbl stoit dorozhe vseh zemnyh vmeste vzyatyh (hotya "v kosmose dollar vesit men'she", B.Pachinskii (c)). Odnako dlya IK nablyudenii dostatochno postavit' teleskop na samolet. Samoletnye observatorii ispol'zuyutsya uzhe davno (naprimer, kol'ca Urana, otkrytye vo vremya pokrytiya Uranom slaboi zvezdochki, nablyudalis' imenno na takoi observatoii). SOFIA (Stratospheric Observatory For Infrared Astronomy) - budet aktivno ekspluatirovat'sya cherez dva goda. Eto 3-metrovyi teleskop, ustanovlennyi na samolete (Boeing 747SP). V stat'e opisyvaetsya sam pribor, a takzhe ego sovremennoe sostoyanie.
Authors: Eric G. Blackman, George B. Field Comments: 8 pages LaTeX, figs on last page, submitted to Phys. Rev. Lett astro-ph/0207503 A model of nonlinear evolution and saturation of the turbulent MHD dynamo Authors: A.A. Schekochihin et al. Comments: IOP latex, 23 pages, 6 figures; submitted to New J. Phys V pervoi rabote opisyvaetsya novaya teoriya dinamo. Vtoraya posvyashena evolyucii magnitnogo polya v turbulentnoi provodyashei srede. Obe raboty skoree teorfizicheskie, chem sobstvenno astronomicheskie, odnako oni ochevidno ochen' interesny v plane ih prilozheniya v astrofizike.
Authors: E. Costa et al. Comments: 6 pages, 7 pdf figures, Proceedindg of the Workshop: "XEUS - studying the evolution of the hot universe" held in Garching, March 11-13, 2002, eds. G. Hasinger, Th. Boller and A. Parmar, MPE report XEUS - budushii rentgenovskii sputnik (ob etom my uzhe pisali v nashih obzorah). V stat'e obsuzhdayutsya polyarimetricheskie nablyudeniya na etom apparate. Davno predskazyvalos', chto iz-za neteplovyh mehanizmov izlucheniya i drugih effektov rentgenovskoe izluchenie dolzhno byt' polyarizovannym (v nashei strane etoi problematikoi aktivno zanimaetsya Yu.N. Gnedin s soavtorami). Odnako, do sih por obnaruzhit' polyarizaciyu ne udavalos'. Obsuzhdaetsya novaya metodika registracii lineinoi polyarizacii v rentgenovskom diapazone. Opisyvaetsya prototip budushego polyarimetra.
Authors: A.D. Dolgov Comments: 18 pages, 2 figures; invited talks presented at Rencontres of La Thuile, 2002 and at SpacePart 2002, to be oublished in the Proceedings Obsuzhdayutsya novye modeli formirovaniya antiveshestva vo vselennoi, v chastnosti opisyvayutsya scenarii s obrazovaniem znachitel'nogo kolichestva antielementov tyazhelee geliya. Rassmatrivaetsya svyaz' takih modelei s novymi nablyudeniyami (naprimer s otkrytiem kvazara, obogashennogo zhelezom).
Authors: S. Marri, S.D.M. White Comments: 41 pages, 8 figures. Submitted to MNRAS V nastoyashee vremya mnozhestvo issledovatel'skih grupp po vsemu miru provodyat komp'yuternoe modelirovanie obrazovaniya galaktik. Dlya etogo ispol'zuyutsya raznye metodiki. V svoei stat'e Merri i Uait obsuzhdayut metod sglazhennyh chastic v primenenii k dannoi zadache. Dostoinstva metoda sostoyat v tom, chto pri sushestvennyh perepadah temperatur i plotnostei net "pereohlazhdeniya" na granice razdela faz. Krome etogo raznye fazy mogut sosushestvovat' v olnoi oblasti, a takzhe vozmozhno ih otnositel'noe dvizhenie. V rabote demonstriruetsya ustoichivost' shemy. Takzhe pokazano, chto sistema uspeshnee opisyvaet "vprysk" energii, svyazannyi s nachinayushimsya zvezdoobrazoavniem v galaktike.
Authors: S.T. Gottesman, J.H. Hunter Jr., and V. Boonyasait Comments: To appear in MNRAS, 10 pages with 6 figures Kto sil'nee slon ili kit? Chto massivnee nasha Galaktika ili Tumannost' Andromedy? Dolgoe vremya schitalos', chto M31 massivnee. Odnako, v poslednie neskol'ko let nachali poyavlyat'sya raboty, gde eto osparivaetsya. Vot i avtory govoryat ob otsutstvii u nashei sosedki massivnogo galo, chto oznachaet, chto Mlechnyi Put' vse-taki tyazhelee.
Authors: G. Brodin, M. Marklund Comments: 8 pages, 1 figure Avtory predlagayut novyi metod registracii gravitacionnyh voln, osnovannyi na vozbuzhdenii elektromagnitnyh voln v rezonansnoi polosti. Preimushestvo elektromagnitnyh detektorov pered mehanicheskimi, po mneniyu avtorov, sostoit v tom, chto zdes' legche izbavit'sya ot shuma s pomosh'yu analoga kletki Faradeya. Temp registracii slivayushihsya kompaktnyh ob'ektov poluchaetsya fantasticheskim: desyatki v chas. Eto nastorazhivaet ....
Authors: Roelof Bottema et al. Comments: Accepted for publication in astronomy and astrophysics 9 pages, 9 figures Issleduyutsya krivye vrasheniya chetyreh galaktik, rasstoyaniya do kotoryh izvestny po nablyudeniyam cefeid. Dlya dvuh galaktik krivye, rasschitannye po modificirovannoi dinamike, sovpadayut s nablyudaemymi, esli brat' cefeidnoe rasstoyanie. Dlya tret'ei trebuetsya uvelichenie rasstoyaniya, dlya chetvertoi - umen'shenie. Odnako, rashozhdeniya ne veliki (poryadka tochnosti opredeleniya rasstoyaniya), poetomu nikakogo okonchatel'nogo vyvoda sdelat' ne udaetsya.
Authors: Jurgen Knodlseder, Jean-Pierre Roques Comments: 9 pages, 2 figures, to appear in the proceedings of the XXII Moriond Astrophysics Meeting (held in Les Arcs, 9-16 March 2002) Osen'yu budet zapushen sputnik INTEGRAL (sm. obzornuyu stat'yu astro-ph/0207527, posvyashennuyu etomu apparatu). Eto ochen' vazhnyi dlya nas proekt, t.k. blagodarya tomu, chto zapusk budet proizveden rossiiskim nositelem, primerno chetvert' nablyudaemogo vremeni budet prinadlezhat' Rossii. Prichem vpervye eto vremya budet raspredelyat'sya sredi rossiiskih uchenyh v otkrytom konkurse. Odna iz vazhnyh osobennostei proekta - vozmozhnost' gamma-spektroskopii. Eto budet obespechivat'sya spektrometrom SPI. V stat'e obsuzhdayutsya nauchnye perspektivy ispol'zovaniya dannogo instrumenta. Sredi nih nablyudeniya v liniyah zheleza i alyuminiya (galakticheskoe zvezdoobrazovanie, vspyshki sverhnovyh i ih ostatki), a takzhe annigilyacionnaya liniya.
Authors: M. Gasperini, G. Veneziano Comments: 250 pages, latex, 34 figures included using epsfig Ogromnaya teoreticheskaya rabota po tomu "chto bylo, kogda nichego ne bylo", t.e. po fizike do Bol'shogo Vzryva. V rabote daetsya obzor nereshennyh problem v dannoi oblasti (t.k. vidimo reshennyh problem fakticheski net).
Authors: Michael C. Liu Comments: 4 pages; to appear in Proceedings of IAU 211: Brown Dwarfs, in press V etoi korotkoi zametke rasskazyvaetsya o nablyudenii diskov i korichnevyh karlikov. U 75 procentov nablyudavshihsya karlikov obnaruzhen izbytok izlucheniya v IK oblasti. Eto i ob'yasnyaetsya nalichiem diskov. Sushestvovanie diskov u molodyh zvezd yavlyaetsya horosho izvestnym yavleniem. Ono svyazano sobstvenno s obrazovaniem etih ob'ektov. Obnaruzhenie analogichnyh struktur u korichnevyh karlikov govorit o shozhesti mehanizmov obrazovaniya etih ob'ektov i normal'nyh zvezd.
Authors: T. Montaruli (for the ANTARES Collaboration) Comments: Submitted to ICHEP02 Conference, 31st Int. Conf. on High Energy Physics, 24-31 July 2002, Amsterdam. LaTeX, 10 pages, 9 figures Proekt ANTARES eto morskoi neitrinnyi teleskop. On dolzhen byt' postroen v Sredizemnom more na glubine 2.4 km. Predpolagaemaya data okonchaniya stroitel'stva 2004 g. Ustanovka budet samoi bol'shoi v Evrope (est' eshe Antarktida i Yaponiya). ANTARES eto pervyi shag na puti k kilometrovomu (kubicheskii kilometr) detektoru v more.
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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