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News Release 253 of 734

January 1, 2004 12:01 AM (EST)

News Release Number: STScI-2004-01

Images from Hubble's ACS Tell a Tale of Two Record-Breaking Galaxy Clusters

Technical facts about this news release:

About the Object

Massive Galaxy Cluster RDCS 1252

Object Name:	RDCS 1252.9-2927
Object Description:	Galaxy Cluster
Position (J2000):	R.A. 12h 52m 54s Dec. -29° 27' 17"
Constellation:	Hydra
Distance:	9 billion light-years (2.6 billion parsecs)

About the Data

Data Description:	The field was imaged by Hubble during proposal 9290: H. Ford (JHU), M. Postman (STScI), M. Franx (University of Leiden), J. Blakeslee (JHU) and P. Rosati (ESO). The science team presenting the science results on this object includes J. Blakeslee (JHU), M. Franx (Leiden Observatory), M. Postman (JHU/STScI), P. Rosati (ESO), B. P. Holden (UCO/Lick), G. D. Illingworth (UCO/Lick), H. C. Ford (JHU), N. J. G. Cross (JHU), C. Gronwall (JHU), N. Benítez (JHU), R. J. Bouwens (JHU), T. J. Broadhurst (Hebrew University), M. Clampin (STScI), R. Demarco (ESO), D. A. Golimowski (JHU), G. F. Hartig (STScI), L. Infante (Pontificia Universidad Catolica de Chile), A. R. Martel (JHU), G. K. Miley (Leiden Observatory), F. Menanteau (JHU), G. R. Meurer (JHU), M. Sirianni (JHU) and R. L. White (JHU/STScI).
Instrument:	ACS/WFC
Exposure Date(s):	May - June, 2002
Exposure Time:	21 hours
Filters:	F775W (i), F850LP (z)

About the Image

Image Credit:	NASA, ESA, J. Blakeslee (JHU), M. Postman (STScI), and P. Rosati (ESO)
Release Date:	January 1, 2004

About the Object

Embryonic Galaxy Cluster TN J1338

Object Name:	TN J1338-1942
Object Description:	Galaxy Proto-Cluster
Position (J2000):	R.A. 13h 28m 26s Dec. -19° 42' 30"
Constellation:	Virgo
Distance:	Approximately 12 billion light-years (4 billion parsecs)

About the Data

Data Description:	The field was imaged by Hubble during proposal 9291: H. Ford (JHU), G. Miley (Leiden Observatory), W. Sparks (STScI), Z. Tsvetanov and H. Tran (JHU). The science team presenting this paper includes G. K. Miley (Leiden Observatory), R. A. Overzier (Leiden Observatory), Z. I. Tsvetanov (JHU), R. J. Bouwens (UCO/Lick), N. Benítez (JHU), J. Blakeslee (JHU), H. C. Ford (JHU), G. D. Illingworth (UCO/Lick), M. Postman (STScI), P. Rosati (ESO), M. Clampin (STScI), G. F. Hartig (STScI), A. W. Zirm (Leiden Observatory), H. J. A. Röttgering (Leiden Observatory), B. P. Venemans (Leiden Observatory), D. R. Ardila (JHU), F. Bartko (Bartko Sci. & Tech), T. J. Broadhurst (Hebrew University), R. A. Brown (JHU), C. J. Burrows (JHU), E. S. Cheng (NASA-GSFC), N. J. G. Cross (JHU), C. De Breuck (ESO), P. D. Feldman (JHU), M. Franx (Leiden Observatory), D. A. Golimowski (JHU), C. Gronwall (JHU), L. Infante (Pontificia Universidad Catolica de Chile), A. R. Martel (JHU), F. Menanteau (JHU), G. R. Meurer (JHU), M. Sirianni (JHU), R. A. Kimble (NASA-GSFC), J. E. Krist (STScI), W. B. Sparks (STScI), H. D. Tran (JHU), R. L. White (STScI), and W. Zheng (JHU).
Instrument:	ACS/WFC
Exposure Date(s):	July 9 - 12, 2002
Exposure Time:	8.5 hours
Filters:	F475W(B), F625W (r), F775W (i)

About the Image

Image Credit:	NASA, ESA, G. Miley and R. Overzier (Leiden Observatory)
Release Date:	January 1, 2004