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Galaxy source counts in the infrared provide strong constraints on the evolution of the bolometric energy output from distant galaxy populations. We present the results from deep 24 m imaging from Spitzer surveys, which include 5 ;10 sources to an 80% completeness of ’60 Jy. The 24 m counts rapidly rise at near-Euclidean rates down to 5 mJy, increase with a(More)
Relative to ground-based telescopes, the James Webb Space Telescope (JWST) will have a substantial sensitivity advantage in the 2.2-5 μm wavelength range where brown dwarfs and hot Jupiters are thought to have significant brightness enhancements. To facilitate high contrast imaging within this band, the Near-Infrared Camera (NIRCAM) will employ a Lyot(More)
We review procedures and measurements used to calibrate the photometric zeropoints of the HST Near Infrared Camera and Multiobject Spectrograph (NICMOS). New spectrophotometric models of solar analog and white dwarf standard stars have been calibrated and tested against ground-based photometry, as well as against one another using NICMOS observations(More)
We present an empirical infrared spectral library of medium resolution (R≈2000-3000) H (1.6μm) and K (2.2μm) band spectra of 218 red stars, spanning a range of [Fe/H] from ∼−2.2 to ∼+0.3. The sample includes Galactic disk stars, bulge stars from Baade’s window, and red giants from Galactic globular clusters. We report the values of 19 indices covering 12(More)
We report the first near-infrared (NIR) imaging of a circumstellar annular disk around the young (∼8 Myr), Vega-like star HR 4796A. NICMOS coronagraph observations at 1.1 and 1.6 mm reveal a ringlike symmetrical structure that peaks in reflected intensity (∼70 AU) from the central A0 V star. The ring geometry, 10.05 5 00.02 with an inclination of and a(More)
Building on the legacy of the Sloan Digital Sky Survey (SDSS-I and II), SDSS-III is a program of four spectroscopic surveys on three scientific themes: dark energy and cosmological parameters, the history and structure of the Milky Way, and the population of giant planets around other stars. In keeping with SDSS tradition, SDSS-III will provide regular(More)
The expected stable point spread function, wide field of view, and sensitivity of the NIRCam instrument on the James Webb Space Telescope (JWST) will allow a simple, classical Lyot coronagraph to detect warm Jovian-mass companions orbiting young stars within 150 pc as well as cool Jupiters around the nearest low-mass stars. The coronagraph can also be used(More)
We have obtained images of the Trapezium Cluster (140@@] 140@@ ; 0.3 pc] 0.3 pc) with the Hubble Space Telescope Near-Infrared Camera and Multi-Object Spectrometer (NICMOS). Combining these data with new ground-based K-band spectra (R\ 800) and existing spectral types and photometry, we have constructed an H-R diagram and used it and other arguments to(More)
We present the discovery of a candidate substellar object in a survey of young stars in the solar vicinity using the sensitivity and spatial resolution afforded by the NICMOS coronagraph on the Hubble Space Telescope. The mag object was discovered approximately 20 from the TW Hydrae association member CD 23377795 H 5 12.1 (TWA 5), and the photometry implies(More)
We describe the data reduction algorithms for the Multiband Imaging Photometer for SIRTF (MIPS) instrument. These algorithms are based on extensive preflight testing and modeling of the Si:As (24 μm) and Ge:Ga (70 and 160 μm) arrays in MIPS. The behaviors we describe are typical of stateof-the-art infrared focal planes operated in the low backgrounds of(More)