A particularly interesting application of radiative transfer through clumpy media is our study of attenuation in high-z star-forming galaxies (Lyman Break Galaxies), which are most sensitively detected at rest frame UV wavelengths, where attenuation can be severe.
Furthermore, we are involved in laboratory astrophysics, where we concentrate on the optical properties of hydrogenated amorphous carbon materials, carbon nanoparticles, silicon nanoparticles and sol gels. It is one of our principal goals to identify likely laboratory analogs to the source of extended red emission (ERE) in nebulae and the diffuse interstellar medium.
In addition, we have resumed an observational program directed at a more comprehensive assesment of photoluminescence phenomena associated with dust in a variety of interstellar environments.
Adolf
Witt
Daniele Pierini
Tracy
Smith (Louisiana State University)
Karl
Gordon (Steward Observatory, University of Arizona)
Doug Furton (Rhode Island College)
Uma
Vijh
Gregory
Madsen (University of Wisconsin)
Lerothodi Leeuw
Reflection Nebulae (Witt, Gordon, Leeuw)
DGL (Witt, Gordon)
ERE (Witt, Gordon, Smith, Vijh)
Galaxies (Witt, Gordon, Pierini,
Madsen, Leeuw)
Laboratory Astrophysics (Witt,
Smith)
Lyman Break Galaxies (Vijh,
Witt, Gordon, Pierini)
Small PAHs in the Red Rectangle
U. P. Vijh, A. N. Witt, & K. D. Gordon, 2005, ApJ in press
Dust Attenuation in Late-Type Galaxies. I. Effects on Bulge and Disk Components
D. Pierini, K. D. Gordon, A. N. Witt, & G. J. Madsen, 2004, ApJ in press
Discovery of Blue Luminescence in the Red Rectangle: Possiblr Fluorescence from Neutral Polycyclic Aromatic Hydrocarbon Molecules ?
U. P. Vijh, A. N. Witt, & K. D. Gordon 2004, ApJ, 606, L65
Extremely Red Galaxies: Dust Attenuation and Classification
D. Pierini, C. Maraston, R. Bender, & A. N. Witt 2004, MNRAS, 347, 1
The Role of Polycyclic Aromatic Hydrocarbons in Ultraviolet Extinction. I. Probing Small Molecular Polycyclic Aromatic Hydrocarbons
G. C. Clayton, K. D. Gordon, F. Salama, L. J. Allamandola, P. G. Martin, T. P. Snow, D. C. B. Whittet, A. N. Witt, & M. J. Wolff, 2003, ApJ, 592, 947
Dust in Lyman Break Galaxies
U. Vijh, A. N. Witt, & K. Gordon, 2003, ApJ, 587, 583
Extendend Red Emission in the Evil Eye Galaxy NGC
4826
D. Pierini, A. Majeed, T. A. Bronson, & A. N. Witt, 2002, ApJ, 569,
184
The
Photophysics of the Carrier of Extended Red Emission
T. L. Smith, & A. N. Witt, 2002, ApJ, 565, 304
The Chemical Composition
of the Interstellar Medium
A. N. Witt, 2001, Philosophical Trans. Roy. Soc. Lon. A, 359:(1787),1958
The
DIRTY Model. I. Monte Carlo Radiative Transfer Through Dust
K. D. Gordon, K. A. Misselt, & A. N. Witt, 2001, ApJ, 551,
269
X-Ray
Halos and Large Grains in the Diffuse Interstellar Medium
A. N. Witt, R. K. Smith, & E. Dwek, 2001, ApJL, 550, 201
Dust
Emission Features in NGC 7023 between 0.35 and 0.25 microns: Extended Red
Emission (0.7 microns) and Two New Emission Line Features (1.15 and 1.5
microns)
K.D. Gordon, G. C. Clayton, & A. N. Witt, 2000, ApJ, 544,
859
The
Flux Ratio Method for Determining the Dust Attenuation of Starburst Galaxies
K. D. Gordon, G. C. Clayton, & A. N. Witt, 2000, ApJ 533,
236
Small and Very Small Interstellar
Grains
A. N. Witt, 2000, J. Geophy. Res. Space Phy., 105:(A5), 10299
Multiple
Scattering in Clumpy Media. II. Galactic Environments
A. N. Witt, & K.D. Gordon, 2000, ApJ, 528, 799
The
ammount of Interstellar Carbon Locked in Solid Hydrogenated Amorphous Carbon
D.G. Furton J. W. Laiho, & A. N. Witt, 1999, ApJ, 526, 752
Silicon
Nanoparticles and Interstellar Extinction
V. G. Zubko, T. L. Smith, & A. N. Witt, 1999, ApJL, 511,
L57
Silicon
Nanoparticles: Source of Extended Red Emission
A. N. Witt, K. D. Gordon, & D. G. Furton, 1998, ApJL, 501,
L111
Detection
of Extended Red Emission in the Diffuse Interstellar Medium
K. D. gordon, A. N. Witt, & B. C. Friedmann, 1998, ApJ, 498,
522
Attenuation
Effects in Spiral Galaxies: Multiwavelength Photometry and Disk Radiative
Transfer Models
L. E. Kuchinski, D. M. Terndrup, K. D. Gordon, & A. N. Witt, 1998,
AJ, 115, 1438
The
1997 Reference of Diffuse Night Sky Brightness
C. Leinert, S. Bowyer, & L. K. Haikala, 1998, A&A Supp., 127,
1
Dust
in Starburst Galaxies
K. D. Gordon, D. Calzetti, & A. N. Witt, 1997, ApJ, 487,
625
Radiative
Transfer Analysis of Far-UV Background Observations Obtained with the Far-Ultraviolet
Space Telescope (FAUST)
A. N. Witt, B. C. Friedmann, & T. P. Sasseen 1997, ApJ, 481,
809
Multiple
Scattering in Clumpy Media. I. Escape of Stellar Radiation from a Clumpy
Scattering Environment
A. N. Witt & K. D. Gordon 1996, ApJ, 463, 681
Radiative Transfer in Cloudy
Galaxies: Evolution of Far-IR Luminosity
A. N. Witt & K. D. Gordon 1996, in "Unveiling the Cosmic Infrared
Background", (AIP Conference Proc. No. 348), ed. E. Dwek (NW: AIP
Press)
Interstellar
Depletion Updated: Where All The Atoms Went
T. P. Snow & A. N. Witt 1996, ApJ, 468, L65
The Interstellar Carbon
Budget and the Role of Carbon in Dust and Large Molecules
T. P. Snow & A. N. Witt 1995, Science, 270, 1455
Scattering
Properties of Dust in the Reflection Nebula IC 435
D. Calzetti, R. C. Bohlin, K. D. Gordon, A. N. Witt, & L. Bianchi
1995, ApJ, 446, L97
Imaging
in the Optical and Near-Infrared Regimes II. Arcsecond Spatial Resolution
of Widely Distributed Cold Dust in Spiral Galaxies
D. L. Block, A. N. Witt, P. Grosbol, A. Stockton, & A. Moneti 1994,
A&A, 288, 383
K'-Band
Observations of the Evil Eye Galaxy: Are the Optical and Near-Infrared
Dust Albedos Identical?
A. N. Witt, R. S. Lindell, D. L. Block, & Rh. Evans 1994, ApJ,
427,
227
The Far-Ultraviolet Dust Albedo in the Upper Scorpius Subgroup in the Sco
OB2 Association
K. D. Gordon, A. N. Witt, G. R. Carruthers, S. A. Christensen, &
B. C. Dohne 1994, ApJ, 432, 641
Activation
of ERE Photoluminescence in Carbon Solids by Exposure to Atomic Hydrogen
and UV Radiation
D. G. Furton & A. N. Witt 1993, ApJ, 415,L51
Voyager
2 Observations of NGC 7023: Dust Scattering Shortward of 1600A
A. N. Witt, J. K. Petersohn, J. B. Holberg, J. Murthy, A. Dring, &
R. C. Henry 1993, ApJ, 410, 714
Dust and the Transfer of Stellar Radiation within Galaxies
A. N. Witt, H. A. Thronson, & J. Capuano 1992, ApJ, 393,
611
UIT
Images of the Reflection Nebula NGC 7023: Derivation of UV Scattering Properties
of Dust Grains
A. N. Witt, J. K. Petersohn, R. C. Bohlin, R. W. O'Connell, M. S. Roberts,
A. M. Smith, & T. P. Stecher 1992, ApJ, 395, L5
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