The R.A.P. Project (Reviews of Astro-Ph)
Metody obrabotki dannyh
(Arhiv Metody obrabotki: v.2, 2003,
v.1, 2002-2003)
Authors: A.N. Belikov, S. Roser
Comments: 14 pages, 20 figures, accepted by A&A
Seichas est' mnogo horoshih obzorov neba s fotometricheskimi dannymi v shirokih polosah. Iz etih dannyh mozhno bylo by poprobovat' ocenit' parametery zvezd (effektivnye temperatury, metallichnost', silu tyazhesti), no ne vse tak prosto - est' mezhzvezdnoe veshestvo, kotoroe privodit k pokrasneniyu. Avtory predlagayut metod, kotoryi, po ih utverzhdeniyu, horosho spravlyaetsya s etoi neprostoi i aktual'noi zadachei.
Sm. takzhe arxiv:0808.1848 ob absolyutnoi kalibrovke zvezd glavnoi posledovatel'nosti tonkogo diska po nablyudeniyam v optike i blizhnem IK.
Authors: Chris J. Lintott et al.
Comments: Submitted to MNRAS
V stat'e podrobno opisany rezul'taty proekta, v ramkah kotorogo mnozhestvo nezavisimyh (v osnovnom ne professional'nyh) pol'zovatelei vizual'no inspektirovalo SDSS na predmet klassifikacii galaktik po ih morfologii. Vsego v proekte prinyalo uchastie okolo 100 000 pol'zovatelei, sdelavshih okolo 40 mln. ocenok.
Razumeetsya, provodilis' testy, kogda nebol'shie vyborki galaktik prosmatrivalis' professionalami, a potom rezul'taty sravnivalis' s ocenkami neprofessioneal'nyh pol'zovatelei. Soglasie bylo horoshim.
Authors: A. A. Mahabal et al.
Comments: Latex, 4 pages, 3 figures, macros included. To appear in refereed proceedings of "Hotwiring the Transient Universe 2007", eds. A. Allan, R. Seaman, and J. Bloom, Astron. Nachr. vol. 329, March, 2008
Opisyvaetsya metodika avtomaticheskogo klassificirovaniya tranzientnyh ob'ektov pri provedenii massovyh shirokopol'nyh obzorov neba.
Authors: R. Feldmann
Comments: 33 pages, 3 Figures, 7 Tables.
ZEBRA - Zurich Extragalactic Bayesian Redshift Analyzer. Eto otkrytaya programma, pozvolyayushaya provodit' massovye opredeleniya krasnyh smeshenii vnegalakticheskih ob'ektov po fotometricheskim dannym. Stat'ya yavlyaetsya rukovodstvom k etoi programme.
Authors: Licia Verde
Comments: 52 pages, To appear in the proceedings of the XIX Canary Island Winter School "The Cosmic Microwave Background: from Quantum fluctuations to the present Universe"
V samam dele, nikakogo bla-bla-bla. Prakticheskoe rukovodstvo. Dazhe zadachi est'. Navernoe, budet polezno ne tol'ko tem, kto nachinaet izuchat' obrabotku kosmologicheskih dannyh, a voobshe vsem, kto nachinaet ispol'zovat' statmetody dlya raboty s dannymi.
Authors: F. Mignard et al.
Comments: 7 pages, 2 figures, Proceedings of IAU Symp. 248
Astrometricheskii sputnik GAIA budet peredavat' ochen' bol'shoi potok dannyh. Rech' idet primerno o 100 Terabaitah za pyat' let raboty. V stat'e opisyvayutsya osnovnye slozhnosti pri rabote s etimi dannymi i puti resheniya problem.
Authors: Pavel D. Naselsky et al.
Comments: 11 pages, 15 figures, submitted to ApJ
Na kartah mikrovolnovogo fona (reliktovogo izlucheniya), postroennyh komandoi WMAP, est' zagadochnoe holodnoe pyatno na galakticheskoi shirote -57 i dolgote 209 gradusov. Avtory stat'i provodyat podrobnyi analiz. Hitrost' tut v tom, chto karty mikrovolnovogo fona stroyatsya sovsem ne tak, kak obychnye karty. T.e. eto ne nanesenie na kartu neba "tochek" s izmerennoi temperaturoi. Postroenie karty zavyazano zdes' na slozhnye metody obrabotki. V itoge mozhet poluchit'sya tak, chto nekotorye "detali" na karte voznikayut imenno v sledstvii primeneniya konkretnogo algoritma postroeniya, a vovse ne iz-za sushestvovaniya kakih-to vydelennyh oblastei na nebe. Pohozhe, chto imenno tak i poyavilos' holodnoe pyatno. Avtory detal'no razbirayut, kakie garmoniki mogli vnesti vklad v poyavlenie etogo "mirazha".
Authors: N. C. Hambly et al.
Comments: 28 pages, 18 figures; accepted for publication in MNRAS (2007 November 8)
WFCAM - eto shirokopol'naya infrakrasnaya kamera teleskopa UKIRT. V stat'e opisan arhiv dannyh s etogo pribora.
arxiv:0711.0962
Oshibki fotometricheskogo metoda opredeleniya krasnyh smeshenii
(Photometric Redshift Error Estimators).
Authors: H. Oyaizu et al.
Comments: ApJ, 10 pages
Metody opredeleniya krasnogo smesheniya galaktik na osnove fotometricheskih nablyudenii igrayut vazhnuyu v sovremennoi kosmologii i vnegalakticheskoi astronomii. Spektroskopicheskie krasnye smesheniya naideny dlya milliona galaktik, v to vremya kak cifrovye obzory neba v neskol'kih fil'trah uzhe soderzhat informaciyu o sotnyah millionov galaktik. Prognoz na sleduyushee desyatiletie - neskol'ko milliardov. Podobnaya situaciya stimuliruet razvitie metodov, pozvolyayushih nahodit' krasnye smesheniya galaktik na osnove fotometrii vo mnogih fil'trah. Dannaya rabota posvyashena obsuzhdeniyu oshibok etih metodov i ih sravneniyu s obychnymi spektroskopicheskimi.
arxiv:0711.2016
Vershina krasnoi vetvi gigantov (The Tip of the Red Giant Branch).
Authors: M. Bellazzini1
Comments: Mem.SAI, 8 pages
Nebol'shoi soderzhatel'nyi obzor metoda TRGB (the Tip of the Red Giant Branch), nezamenimogo v opredelenii rasstoyanii do galaktik raznyh morfologicheskih tipov. Predstavlen kratkii obzor poslednih rezul'tatov, kasayushihsya kalibrovki vershiny krasnoi vetvi gigantov v kachestve "standartnoi svechi". Obsuzhdaetsya dostignutoe soglasie sredi nezavisimyh empiricheskih kalibrovok etogo metoda.
arxiv:0711.2163
Predskazanie spektral'nyh harakteristik galakticheskih spektrov na
osnove shirokopolosnoi fotometrii
(Predicting spectral features in galaxy spectra from broad-band photometry).
Authors: F. B. Abdalla et al.
Comments: MNRAS, 10 pages
Avtory raboty poprobovali otvetit' na vopros, mozhno li naiti empiricheskie sootnosheniya mezhdu ekvivaletnymi shirinami galakticheskih emissionnyh linii i cvetami, poluchennymi iz shirokopolosnoi fotometrii. Dlya etogo byli ispol'zovany dva raznyh metoda "Artifical Neural Neworks" i "Locally Weighted Regression", sut' kotoryh svoditsya k poisku korrelyacii mezhdu ekvivalentnymi shirinami linii i pokazatelyami cveta v mnogomernom cvetovom prostranstve. Metodika byla protestirovana na dvuh obrazcah: dlya galaktik na malyh krasnyh smesheniyah ispol'zovalsya obzor SDSS, a dlya galaktik na bol'shih krasnyh smesheniyah rezul'taty pervogo reliza obzora DEEP. Metody priveli k pohozhim rezul'tatam. V chastnosti, bylo naideno, chto rekombinacionnye linii mogut byt' dostotochno horosho predskazany na osnove galakticheskih cvetov, no dlya stolknovitel'nyh linii prognoz sdelat' slozhnee. Bylo naideno, chto na osnove odnih tol'ko pokazatelei cveta mozhno dostatochno nadezhno klassificirovat' galaktiki s aktivnymi galakticheskimi yadrami ili zvezdoobrazovaniem.
Authors: Nicholas M. Ball, Robert J. Brunner, Adam D. Myers
Comments: 4 pages, 1 figure, uses adassconf.sty, asp2006.sty. To appear in the proceedings of ADASS XVII, London, UK, Sep 2007
Rabota s bol'shimi sovremennymi obzorami, tipa Sloanovskogo, trebuet sovershenno novyh chislennyh metodov. Im i posvyashena dannaya stat'ya. Ideya sostoit v razrabotke algoritmov, pozvolyayushih komp'yuteru "obuchat'sya" klassificirovat' ob'ekty.
arxiv:0709.4551
Spektral'naya biblioteka zvezd v infrakrasnom diapazone: III.
Spektry v polose J (A Near-Infrared Stellar Spectral Library: III.
J-Band Spectra)
Authors: Arvind C. Ranade et al.
Comments: BASI, 26 pages
Predstavleny rezul'taty nablyudenii, provedennyh na indiiskom infrakrasnom 1.2 m teleskope GIRT (Gurushikhar Infrared Telescope). Avtorami privedena biblioteka infrakrasnyh spektrov dlya 126 zvezd spektral'nyh tipov O5-M8 i klassov svetimosti I-V. Vse spektry byli polucheny v polose J s razresheniem 12.5 A. Dannaya publikaciya yavlyaetsya tret'ei v serii rabot na etu temu. Ranee opublikovany spektry 135 zvezd v polose H s razresheniem 16 A (Ranade et al, 2004) i spektry 114 zvezd v polose K s razresheniem 22 A (Ranade et al., 2007). Polnost'yu biblioteka spektrov zvezd v infrakrasnyh polosah J, H & K summirovana v v vide ASCII tablic i dostupna na avtorskom veb-saite po adresu http://vo.iucaa.ernet.in/~voi/NIR_Header.html
arxiv:0710.1194
Rezul'taty sistematicheskogo poiska novyh zvezd v galaktike M31 na osnove
bol'shogo chisla ocifrovannyh arhivnyh shmidtovskih plastinok (A systematic
search for novae in M31 on a large set of digitized archival Schmidt plates)
Authors: M. Henze et al.
Comments: A&A, 29 pages
Sistematicheskii poisk tak nazyvaemyh novyh zvezd v galaktike M31 vpervye byl nachat Edvinom Habblom v 1929 i ne prekrashaetsya do sih por. Takoi monitoring trebuet bol'shogo kolichestva nablyudatel'nogo vremeni, poetomu arhivnye shmidtovskie plastinki po-prezhnemu imeyut bol'shuyu nablyudatel'nuyu cennost'. Avtory dannoi raboty ocifrovali 306 takih plastin, poluchiv tem samym dostup k dannym za 36 let nablyudenii s 1960 po 1996 god. Razrabotannyi avtorami avtomatizirovannyi analiz krivyh bleska pozvolil im vydelit' 84 kandidata v novye zvezdy. Polozheniya zvezd opredeleny s tochnost'yu 0."4. Krivye bleska novyh zvezd dostupny na sootvetstvuyushem veb-saite. Provedennyi avtorami analiz pokazal, chto pri sootvetstvuyushei obrabotke starye shmidtovskie plastiny mogut byt' ves'ma polezny.
arxiv:0709.2711
Populyacionnyi sintez v korotkovolnovom diapazone i sposoby
spektrofotometricheskoi diagnostiki evolyucii galaktik (Population
synthesis at short wavelengths and spectrophotometric diagnostic
tools for galaxy evolution)
Authors: A. Buzzoni et al.
Comments: 8 pages, Invited contribution to "New quests in stellar astrophysics. II: Ultraviolet properties of evolved stellar populations" (Puerto Vallarta, Mexico, Apr 2007),
Pri nablyudeniyah galaktik na bol'shih krasnyh smesheniyah ul'trafioletovaya chast' spektrov smeshaetsya v opticheskii diapazon. Poetomu detali i harakter evolyucii dalekih galaktik v korotkovolnovoi oblasti izucheny namnogo luchshe. Dlya analiza spektrov dalekih galaktik v kachestve obrazcov (galactic templates) ispol'zuyutsya ul'trafioletovye spektry blizkih galaktik, poluchennye so sputnikov. V takom empiricheskom podhode lokal'nye svoistva galaktik prosto ekstrapoliruyutsya na bol'shie krasnye smesheniya. Al'ternativnyi sposob poyavilsya sovsem nedavno. Blagodarya progressu v modelirovanii zvezdnyh atmosfer, byli sozdany biblioteki zvezdnyh spektrov i dlya korotkovolnovoi (<3000 angstrem) oblasti, kotorye teper' mogut byt' ispol'zovany dlya sozdaniya model'nyh galakticheskih spektrov. Var'iruya te ili inye parametry, mozhno budet dobit'sya luchshego sovpadeniya nablyudaemyh i model'nyh spektrov, tochnee opisat' svoistva dalekih galaktik. Avtorami predstavleny pervye rezul'taty takogo modelirovaniya, detal'noe opisanie proekta gotovitsya k publikacii (Bertone et al., 2007).
Authors: David G. Barnes, Christopher J. Fluke
Comments: 18 pages, 7 figures, submitted to New Astronomy.
V stat'e opisyvaetsya, kak mozhno, ispol'zuya novuyu versiyu Acrobat Portable Document Format i biblioteku S2PLOT, vklyuchit' v tekst stat'i (razmeetsya, v elektronnuyu versiyu) trehmernuyu grafiku v interaktivnom rezhime (t.e. kartinki mozhno vrashat' i tp.). Krome prochteniya stat'i rekomenduetsya takzhe zaglyanut' na sait.
Authors: Igor Chilingarian
Comments: 2 pages, 1 figure, Stellar Populations as Building Blocks of Galaxies, Proceedings of IAU Symposium #241. Edited by A. Vazdekis and R. F. Peletier. Cambridge: Cambridge University Press, 2007, pp.177-178
Sravnivayutsya dva podhoda pri organizacii dostupa k dannym o zvezdnyh populyaciyah v Virtual'noi observatorii. K sozhaleniyu, zametka ochen' korotkaya, poetomu, po suti, prihoditsya dovol'stvovat'sya lish' vyvodami avtora. Vse detali ostayutsya za bortom.
arxiv:0709.3255
Novaya kalibrovka sootnosheniya period-svetimost' dlya cefeid Galaktiki
v fil'trah ot B do K i sravnenie s analogichnym sootnosheniem dlya cefeid
BMO (A new calibration of Galactic Cepheid Period-Luminosity relations
from B to K bands, and a comparison to LMC PL relations)
Authors: P. Fouque et al.
Comments: 12 pages, A&A in press
Avtorami byli izucheny 59 cefeid s izvestnymi parallaksami s cel'yu otkalibrovat' sootnoshenie period-svetimost' dlya cefeid Galaktiki i sravnit' ego s analogichnym sootnosheniem dlya cefeid Bol'shogo Magellanova Oblaka (BMO). Nablyudeniya provodilis' v semi fil'trah (B, V, Rc, Ic, J, H, Ks), a rasstoyaniya do cefeid byli nezavisimo izmereny pyat'yu sposobami. Sushestvennyh otlichii mezhdu naklonami v sootnosheniyah period-svetimost' dlya cefeid Galaktiki i BMO v spektral'nom diapazone ot B do K naideno ne bylo. Po-vidimomu, dannoe sootnoshenie imeet universal'nyi naklon i ne zavisit ot metallichnosti galaktiki.
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: LIGO Scientific Collaboration: B. Abbott, et al
Comments: 39 pages, 41 figures
Privedeny dannye obrabotki ocherednogo (chetvertogo) otrezka nauchnoi raboty gravitacionno-volnovoi antenny LIGO. Eto byl dostatochno korotkii progon - okolo mesyaca - v nachale 2005 goda. No vazhno ponimat', chto obrabotka dannyh zanimaet ochen' bol'shoe vremya!
Avtory obsuzhdayut poiski periodicheskogo signala. Nichego ne naideno, no predely (osobenno dlya nekotoryh uchastkov nebesnoi sfery) stanovyatsya uzhe interesnymi.
Authors: Daniel J. Price
Comments: 14 pages, 11 figures, accepted to PASA
Avtor opisyvaet (i reklamiruet) soft dlya vizualizacii gidrodinamicheskih raschetov metodom sglazhennyh chastic. Programma dostupna dlya skachivaniya.
Authors: T. Murphy et al.
Comments: 12 pages, 9 figures, to be published in MNRAS
Predstavleny dannye vtoroi epohi obzora galakticheskoi ploskosti, provodimogo na chastote 843 MGc v observatorii Molonglo. Pokryta oblast' neba s galakticheskoi shirotoi do 10 gradusov, i dolgotoi ot 245 do 365 gradusov. V dannoi stat'e opisany rezul'taty, poluchennye po kompaktnym istochnikam. Voshlo 48 850 ob'ektov.
Authors: Thomas Rauch
Comments: 4 pages, 3 figures
Opisyvaetsya odin iz instrumentov, predostavlyaemyi Nemeckoi Virtual'noi observatoriei (GAVO). Rech' idet o programmnom obespechenii dlya modelirovaniya spektrov zvezd i tumannostei. Eto nuzhno dlya bystrogo sravneniya dannyh nablyudenii s teoreticheskimi modelyami.
Authors: O. V. Verkhodanov et al.
Comments: 12 pages, 1 figure, Bull. SAO, No 58, 118-129 (2005)
Na samom dele sostoyanie ne sovsem "tekushee" - stat'ya 2005 goda, no vse ravno rekomenduetsya k prochteniyu.
Rech' idet o polezneishei baze dannyh CATS.
Authors: Shai Kaspi
Comments: 10 pages, 4 figures, Conference proceedings to appear in "The Central Engine of Active Galactic Nuclei", ed. L. C. Ho and J.-M. Wang (San Francisco: ASP)
Chasto sprashivayut: "A kak opredelyayut massy chernyh dyr v galaktikah?" A vot tak! Chitaite ob odnom iz metodov.
Ideya sostoit v tom, chto po izmeneniyam potoka izlucheniya ot aktivnogo yadra mozhno sudit' o povedenii gaza vokrug chernoi dyry. Nuzhno tol'ko dostatochno chasto i regulyarno provodit' fotometricheskie nablyudeniya i poluchat' spektry (vazhno ved' takzhe i to, kak menyaetsya intesivnost' spektral'nyh linii i tp.). Nu a povedenie gaza soderzhit v sebe informaciyu o masse dyry.
Konechno, metod bolee chem ne pryamoi. Tem ne menee, vpolne poleznyi.