Credit: NASA/JPL-Caltech/D. Watson (Univ. of Rochester)

Spitzer Sees Water Loud and Clear

This plot of infrared data, called a spectrum, shows the strong signature of water vapor deep within the core of an embryonic star system, called NGC 1333-IRAS 4B.

The data were captured by NASA's Spitzer Space Telescope using an instrument called a spectrograph. A spectrograph collects light and sorts it according to color, or wavelength. In this case, infrared light from NGC 1333-IRAS 4B was broken up into the wavelengths listed on the horizontal axis of the plot. The sharp spikes, called spectral lines, occur at wavelengths at which the stellar object is particularly bright. The signature of water vapor is revealed in the pattern of wavelengths at which the spikes appear.

By comparing the observed data to a model (lower curve), astronomers can also determine the physical and chemical details of the region. For example, astronomers say these data suggest that ice in a cocoon surrounding the forming star is falling inward. The ice then smacks supersonically into a dusty planet-forming disk surrounding the stellar embryo, heats up and vaporizes quickly, releasing the infrared light that Spitzer collected.

About the Object	Object Name: NGC 1333-IRAS 4B Object Type: protostar Position (J2000): RA: 3 29 12 Dec: +31 13 08 Distance: 320 pc (1000 light-years) Constellation: Pegasus
About the Data	Image Credit: NASA/ JPL-Caltech/D. Watson (University of Rochester) Instrument: Infrared Spectrograph (IRS) Wavelength: 20 to 37 microns Exposure Date: March 2006 Release Date: 2007-08-29
Observers	Dan Watson (University of Rochester) C.J Bohac (University of Rochester) C. Hull (University of Rochester) William J. Forrest (University of Rochester) Ben Sargent (University of Rochester) Joel Green (University of Rochester) Kyoung Hee Kim (University of Rochester) E. Furlan (University of California at Los Angeles) Joan Najita (National Optical Astronomy Observatory) Nuria Calvet (University of Michigan) Lee Hartmann (University of Michigan) Paola dÕAlessio (National Autonomous University of Mexico) Jim Houck (Cornell University)

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