Search Publications

PDRs4All: A JWST Early Release Science Program on Radiative Feedback from Massive Stars

Hartigan, Patrick; Zhang, Yong; Gordon, Karl D. +134 more

Massive stars disrupt their natal molecular cloud material through radiative and mechanical feedback processes. These processes have profound effects on the evolution of interstellar matter in our Galaxy and throughout the universe, from the era of vigorous star formation at redshifts of 1-3 to the present day. The dominant feedback processes can …

Consistent Dust and Gas Models for Protoplanetary Disks. III. Models for Selected Objects from the FP7 DIANA Project

Waters, L. B. F. M.; Pinte, C.; Woitke, P. +17 more

The European FP7 project DIANA has performed a coherent analysis of a large set of observational data of protoplanetary disks by means of thermo-chemical disk models. The collected data include extinction-corrected stellar UV and X-ray input spectra (as seen by the disk), photometric fluxes, low and high resolution spectra, interferometric data, e…

Data Reduction and Early Science Calibration for FORCAST, A Mid-Infrared Camera for SOFIA

Schoenwald, J.; Wang, J.; Vacca, W. D. +7 more

FORCAST is a mid-infrared (5-40 µm) facility instrument for the Stratospheric Observatory for Infrared Astronomy (SOFIA). After achieving first light flight in 2010 May, FORCAST has completed two observatory characterization flights and thirteen science flights on SOFIA. In this paper we describe the photometric calibration of FORCAST which …

Multiwavelength Analyses of Faint Infrared Galaxies

Berta, Stefano

The present work follows a chronological outline covering the development of infrared space facilities in recent decades. The Infrared Astronomical Satellite (launched in 1984), Infrared Space Observatory (1995), and Spitzer Space Telescope (2003 August) constitute a logical sequence in the study of galactic infrared properties, with a well-modula…

Infrared Space Observatory Observations of the 53W002 Group at 6.7 Microns: In Search of the Oldest Stellar Populations at z = 2.4

Keel, William C.; Windhorst, Rogier A.; Eales, Stephen A. +5 more

We present a deep Infrared Space Observatory (ISO) observation at 6.7 µm of the 53W002 group of galaxies and active galactic nuclei (AGNs) at z=2.4. This approximately samples the emitted K band. Faint, blue star-forming objects are not detected, as expected from their very blue color across the emitted optical and UV spectrum. However, 53W0…

SINGS: The SIRTF Nearby Galaxies Survey

Kewley, Lisa J.; Gordon, Karl D.; Calzetti, Daniela +20 more

The SIRTF Nearby Galaxy Survey is a comprehensive infrared imaging and spectroscopic survey of 75 nearby galaxies. Its primary goal is to characterize the infrared emission of galaxies and their principal infrared-emitting components, across a broad range of galaxy properties and star formation environments. SINGS will provide new insights into th…

The Nuclear Spectral Energy Distribution of NGC 4395, the Least Luminous Type 1 Seyfert Galaxy

Moran, Edward C.; Filippenko, Alexei V.; Ho, Luis C. +5 more

We present X-ray (ROSAT), infrared, and radio observations of NGC 4395, which harbors the optically least luminous type 1 Seyfert nucleus discovered thus far. In combination with published optical and ultraviolet spectra, we have used these data to assemble the broadband spectral energy distribution (SED) of the galaxy's nucleus. Interestingly, th…

Automatic Noise Estimation from the Multiresolution Support

Starck, Jean-Luc; Murtagh, Fionn

We describe an automated approach for determining the noise associated with astronomical images. Detector noise is ever present and must be determined for high-quality image filtering or compression. We also show that the method can be used for very high quality cosmic-ray hit removal. Our method is based on a multiresolution transform of the imag…

Asteroids as Far-Infrared Photometric Standards

Müller, Thomas G.