G. Helou

Learn More
The Spitzer Space Telescope, NASA's Great Observatory for infrared astronomy, was launched 2003 August 25 and is returning excellent scientific data from its Earth-trailing solar orbit. Spitzer combines the intrinsic sensitivity achievable with a cryogenic telescope in space with the great imaging and spectroscopic power of modern detector arrays to provide(More)
This paper presents an overview of the Interactive Analysis System for ISOCAM (CIA). 10 With this system ISOCAM data can be analysed for calibration and engineering purposes, the ISOCAM pipeline software validated and reened, and astronomical data processing can be performed. The system is mainly IDL-based but contains FORTRAN, C and C++ parts for special(More)
We report the results of a joint analysis of data from BICEP2/Keck Array and Planck. BICEP2 and Keck Array have observed the same approximately 400 deg 2 patch of sky centered on RA 0h, Dec. −57.5 •. The combined maps reach a depth of 57 nK deg in Stokes Q and U in a band centered at 150 GHz. Planck has observed the full sky in polarization at seven(More)
  • J D T Smith, B T Draine, D A Dale, J Moustakas, R C Kennicutt, G Helou +11 others
  • 2007
We present a sample of low-resolution 5Y38 m Spitzer IRS spectra of the inner few square kiloparsecs of 59 nearby galaxies spanning a large range of star formation properties. A robust method for decomposing mid-infrared galaxy spectra is described and used to explore the behavior of PAH emission and the prevalence of silicate dust extinction. Evidence for(More)
  • B T Draine, D A Dale, G Bendo, K D Gordon, J D T Smith, L Armus +14 others
  • 2007
Physical dust models are presented for 65 galaxies in the SINGS survey that are strongly detected in the four IRAC bands and three MIPS bands. For each galaxy we estimate (1) the total dust mass, (2) the fraction of the dust mass contributed by PAHs, and (3) the intensity of the starlight heating the dust grains. We find that spiral galaxies have dust(More)
The most important cooling lines of the neutral interstellar medium (ISM) lie in the far-infrared (FIR). We present measurements by the Infrared Space Observatory Long Wavelength Spectrometer of seven lines from neutral and ionized ISM of 60 normal, star-forming galaxies. The galaxy sample spans a range in properties such as morphology, FIR colors(More)
  • M Lacy, G Wilson, F Masci, L J Storrie-Lombardi, P N Appleton, L Armus +16 others
  • 2005
We present Infrared Array Camera (IRAC) data and source catalogs from the Spitzer Space Telescope Extragalactic First Look Survey. The data were taken in four broad bands centered at nominal wavelengths of 3.6, 4.5, 5.8 and 8.0µm. A set of mosaics and catalogs have been produced which are ≈ 80% complete and ≈ 99% reliable to their chosen flux density(More)
We report the results of a joint analysis of data from BICEP2/Keck Array and Planck. BICEP2 and Keck Array have observed the same approximately 400  deg^{2} patch of sky centered on RA 0 h, Dec. -57.5°. The combined maps reach a depth of 57 nK deg in Stokes Q and U in a band centered at 150 GHz. Planck has observed the full sky in polarization at seven(More)
  • S C Chapman, G Helou, G F Lewis, D A Dale
  • 2008
We present a characterization of the local luminosity-color, bi-variate distribution of IRAS galaxies from the 1.2 Jy sample, selected at 60 µm. The R(60, 100) infrared color is used as the best single parameter description of the IR spectral energy distribution of galaxies. We derive an analytical form of the distribution and use it to constrain the effect(More)