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Block, David L.; Puerari, I.; Frogel, J. A.; Eskridge, Paul B.; Stockton, Alan; Fuchs, B.

doi:10.1023/a:1017099302995

Cited by 62 publications

(105 citation statements)

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“…By utilizing the more accurate nonlocal WKB approximation, it may be shown that in fact the characteristic oscillation frequencies of an inhomogeneous disk must be quantized, i.e., must pass through a discrete series of values. In galaxies, discrete spiral modes were already found in stellar population by Rix & Zaritsky (1995), Zaritsky & Rix (1997), Rudnick & Rix (1998), and Block & Puerari (1999). In the near-infrared, the morphology of older star-dominated disk indicates a simple classification scheme: the dominant Fourier m-mode.…”

Section: Linear Theorymentioning

confidence: 88%

Quasi-linear theory of the Jeans instability in disk-shaped galaxies

Griv

Gedalin

Yuan

2002

A&A

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Abstract. We analyse the reaction between almost aperiodically growing Jeans-unstable gravity perturbations and stars of a rotating and spatially inhomogeneous disk of flat galaxies. A mathematical formalism in the approximation of weak turbulence (a quasi-linearization of the Boltzmann collisionless kinetic equation) is developed. A diffusion equation in configuration space is derived which describes the change in the main body of equilibrium distribution of stars. The distortion in phase space resulting from such a wave-star interaction is studied. The theory, applied to the Solar neighborhood, accounts for the observed Schwarzschild shape of the velocity ellipsoid, the increase in the random stellar velocities with age, and the essential radial migration of the Sun from its birth-place in the inner part of the Galaxy outwards during its lifetime.

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Section: Linear Theorymentioning

confidence: 88%

Quasi-linear theory of the Jeans instability in disk-shaped galaxies

Griv

Gedalin

Yuan

2002

A&A

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“…The bidimensional Fourier method was used to secure information about the morphology (see, e.g., Puerari and Dottori 1992;Block and Puerari 1999, and references therein). The simulations recreate a given image when moved out to higher redshifts, always in a pre-selected restframe.…”

Section: Discussionmentioning

confidence: 99%

“…In this contribution, we quantitatively determine the dust-penetrated structures of high redshift galaxies such as NGC 922 in their near-infrared restframes. We show that such optically peculiar objects may readily be classified using the dust penetrated z∼0 templates of Block and Puerari (1999) and Buta and Block (2001). …”

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confidence: 97%

Dust Penetrated Morphology in the High Redshift Universe

Block

Puerari

Takamiya

et al. 2002

New Quests in Stellar Astrophysics: The Link Between Stars and Cosmology

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Abstract. Images from the Hubble Deep Field (HDF) North and South show a large percentage of dusty, high redshift galaxies whose appearance falls outside traditional classification systems. The nature of these objects is not yet fully understood. Since the HDF preferentially samples restframe UV light, HDF morphologies are not dust or 'mask' penetrated. The appearance of high redshift galaxies at near-infrared restframes remains a challenge for the New Millennium. The Next Generation Space Telescope (NGST) could routinely provide us with such images. In this contribution, we quantitatively determine the dust-penetrated structures of high redshift galaxies such as NGC 922 in their near-infrared restframes. We show that such optically peculiar objects may readily be classified using the dust penetrated z∼0 templates of Block and Puerari (1999) and Buta and Block (2001).

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“…In the present paper we adopt the dust penetrated classification scheme for local spirals proposed by Block & Puerari (1999) and Buta & Block (2001). In the nearinfrared, the morphology of the older star dominated disk indicates a simple classification scheme (see Figs.…”

Section: Morphological Classificationmentioning

confidence: 99%

“…In this paper we demonstrate that 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 and z = 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 ∼ 0 template of Block & Puerari (1999) and Buta & 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.…”

mentioning

confidence: 99%

Dust-penetrated morphology in the high-redshift universe: Clues from NGC 922

Block

Puerari

Takamiya

et al. 2001

A&A

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Abstract.Results from the Hubble Deep Field (HDF) North and South show a large percentage of high-redshift galaxies whose appearance falls outside traditional classification 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 order to explore the capability of NGST for undertaking such science, we present NASA-IRTF and SCUBA observations of NGC 922, a chaotic system in our local Universe 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 highredshifts, then this galaxy may serve as a local morphological "Rosetta stone" bridging low and high-redshift populations. In this paper we demonstrate that 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 and z = 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 ∼ 0 template of Block & Puerari (1999) and Buta & 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 results suggest that the capability of efficiently exploring the rest-wavelength IR morphology of high-z galaxies should probably be a key factor in deciding the final choice of instruments for the NGST.

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Cited by 62 publications

References 0 publications

Quasi-linear theory of the Jeans instability in disk-shaped galaxies

Quasi-linear theory of the Jeans instability in disk-shaped galaxies

Dust Penetrated Morphology in the High Redshift Universe

Dust-penetrated morphology in the high-redshift universe: Clues from NGC 922

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