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Titolo:
Dust-penetrated morphology in the high-redshift universe: Clues from NGC 922
Autore:
Block, DL; Puerari, I; Takamiya, M; Abraham, R; Stockton, A; Robson, I; Holland, W;
Indirizzi:
Univ Witwatersrand, Dept Computat & Appl Math, ZA-2050 Wits, South Africa Univ Witwatersrand Wits South Africa ZA-2050 ZA-2050 Wits, South Africa Inst Nacl Astrofis Opt & Elect, Tonantzintla 72840, Puebla, Mexico Inst Nacl Astrofis Opt & Elect Tonantzintla Puebla Mexico 72840 a, Mexico Gemini Observ, Hilo, HI 96720 USA Gemini Observ Hilo HI USA 96720Gemini Observ, Hilo, HI 96720 USA Univ Toronto, Dept Astron, Toronto, ON M5S 3H8, Canada Univ Toronto Toronto ON Canada M5S 3H8 stron, Toronto, ON M5S 3H8, Canada Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA Univ Hawaii Honolulu HI USA 96822 ii, Inst Astron, Honolulu, HI 96822 USA Joint Astron Ctr, Hilo, HI 96720 USA Joint Astron Ctr Hilo HI USA 96720Joint Astron Ctr, Hilo, HI 96720 USA
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 2, volume: 371, anno: 2001,
pagine: 393 - 403
SICI:
1432-0746(200105)371:2<393:DMITHU>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
CLERK-MAXWELL-TELESCOPE; BARRED SPIRAL GALAXIES; HUBBLE DEEP FIELD; STELLAR DISK; EVOLUTION; CLASSIFICATION; IMAGES; NORTH; SCUBA; NGST;
Keywords:
galaxies : spiral; galaxies : structure galaxies : kinematics and dynamics galaxies : individual (NGC 922) methods : numerical;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Block, DL Univ Witwatersrand, Dept Computat & Appl Math, Private Bag 3, ZA-2050 Wits, South Africa Univ Witwatersrand Private Bag 3 Wits South Africa ZA-2050 rica
Citazione:
D.L. Block et al., "Dust-penetrated morphology in the high-redshift universe: Clues from NGC 922", ASTRON ASTR, 371(2), 2001, pp. 393-403

Abstract

Results from the Hubble Deep Field (HDF) North and South show a large percentage of high-redshift galaxies whose appearance falls outside traditionalclassification systems. The nature of these objects is poorly understood, but sub-mm observations indicate that at least some of these systems are heavily obscured (Sanders 2000). This raises the intriguing possibility that a physically meaningful classification system for high-redshift galaxies might be more easily devised at rest-frame infrared wavelengths, rather than in the optical regime. Practical realization of this idea will become possible with the advent of the Next Generation Space Telescope (NGST). In orderto explore the capability of NGST for undertaking such science, we presentNASA-IRTF and SCUBA observations of NGC 922, a chaotic system in our localUniverse which bears a striking resemblance to objects such as HDF 2-86 (z= 0.749) in the HDF North. If objects such as NGC 922 are common at high-redshifts, then this galaxy may serve as a local morphological "Rosetta stone" bridging low and high-redshift populations. In this paper we demonstratethat quantitative measures of galactic structure are recoverable in the rest-frame infrared for NGC 922 seen at high redshifts using NGST, by simulating the appearance of this galaxy at redshifts z = 0.7 andz = 1.2 in rest-frame K'. While this object cannot be classified within any optical Hubble bin, simulated NGST images at these redshifts can be readily classified using the dust penetrated z similar to 0 template of Block & Puerari (1999) andButa & Block (2001). The near-infrared disk of NGC 922 is not peculiar at all; rather, it is remarkably regular, even presenting spiral arm modulation, a characteristic signature of several grand design galaxies. Our resultssuggest that the capability of efficiently exploring the rest-wavelength IR morphology of high-z galaxies should probably be a key factor in decidingthe final choice of instruments for the NGST.
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Documento generato il 22/05/13 alle ore 18:24:01