Credit: NASA, ESA/JPL-Caltech/B. Mobasher (STScI/ESA)

Big Galaxy in Baby Universe

NASA's Spitzer and Hubble Space Telescopes combined forces to uncover one of the most distant galaxies ever seen. The faraway galaxy, named HUDF-JD2 (in green circles) is not seen in Hubble's visible-light image (upper right), but was detected using Hubble's near infrared camera and multi-object spectrometer (lower left). It appears even brighter at the longer infrared wavelengths, as revealed by the Spitzer infrared camera (lower right).

At visible wavelengths, the light from the galaxy is absorbed by intervening hydrogen gas, and so the galaxy appears faint in the Hubble visible and near-infrared images. The surprise is how bright is appears to Spitzer in the infrared, suggesting a very massive and distant galaxy.

About the Object	Object Name: HUDF-JD2, UDF033238.74-274839.9 Object Type: High-Redshift Galaxy in the Hubble Ultra Deep Field Position (J2000): RA: 3h 32m 28s.74 Dec: -27¡ 48' 39".9 Distance: redshift of z = 6.5. Constellation: Fornax
About the Data	Image Credit: NASA, ESA/JPL-Caltech/B. Mobasher (STScI/ESA) Instrument: Hubble (ACS & NICMOS), Spitzer (IRAC) Wavelength: ACS Filters: F435W (B), F606W (V), F775W (i), F850LP (z) NICMOS Filters: F110W (J110) and F160W (H160) IRAC: 3.6, 4.5, 5.8, and 8.0 microns Exposure Date: ACS: September 24, 2003 - January 16, 2004 NICMOS: September 3, 2003 - November 27, 2003 Spitzer: February 2004 Exposure Time: ACS: 11.3 days NICMOS: 4.5 days Spitzer: 5 days Release Date: 27 September 2005
Observers	B. Mobasher (STScI/ESA); M. Dickinson (NOAO) H.C. Ferguson(STScI) M. Giavalisco (STScI) T. Wiklind (STScI/ESA) D. Stark (Caltech) R.S. Ellis (Caltech) M. Fall (STScI) N.A. Grogin (JHU) L. Moustakas (STScI) N. Panagia (STScI/ESA) M. Sosey, M. Stiavelli (STScI) E. Bergeron (STScI) S. Casertano (STScI) P. Ingram (Gemini Obs.) A. Koekemoer (STScI) I. Labbe (Carnegie Obs.) M. Livio (STScI) B. Rogers (Gemini Obs.) C. Scarlata (Inst. For Astronomy, Zurich, Switzerland) J. Venet (ESO) A. Renzini (ESO) P. Rosati (ESO) H. Kuntschner (STECF/ESO) M. Kummel (STECF/ESO) J.R. Walsh (STECF/ESO) H. Yan (SSC, Caltech) M. Dickinson (NOAO) D Stern (JPL) P.R.M. Eisenhardt (JPL) R.-R. Chary (SSC, Caltech) C.J. Conselice (Caltech) C. Papovich (Steward) W.T. Reach (SSC, Caltech) N. Grogin (STScI) L.A. Moustakas (JPL) M. Ouchi (STScI)

Individual Images

	Combined Hubble-Spitzer view. Screen-Resolution (450x313): JPEG High-Resolution (948x669): JPEG | Mac TIFF | PC TIFF Credit: NASA, ESA/JPL-Caltech/B. Mobasher (STScI/ESA)
	Hubble visible-light view. Screen-Resolution (450x313): JPEG High-Resolution (948x660): JPEG | Mac TIFF | PC TIFF Credit: NASA, ESA/B. Mobasher (STScI/ESA)
	Hubble near-infrared view. Screen-Resolution (450x313): JPEG High-Resolution (948x660): JPEG | Mac TIFF | PC TIFF Credit: NASA, ESA/B. Mobasher (STScI/ESA)
	Spitzer infrared view. Screen-Resolution (450x313): JPEG High-Resolution (948x660): JPEG | Mac TIFF | PC TIFF Credit: NASA/JPL-Caltech/B. Mobasher (STScI/ESA)

The Spitzer Space Telescope is a NASA mission managed by the Jet Propulsion Laboratory. This website is maintained by the Spitzer Science Center, located on the campus of the California Institute of Technology and part of NASA's Infrared Processing and Analysis Center.