The MAssive Cluster Survey (MACS)[1][2] compiled and characterized a sample of very X-ray luminous (and thus, by inference, massive), distant clusters of galaxies. The sample comprises 124 spectroscopically confirmed clusters at 0.3 < z < 0.7. Candidates were selected from the ROSAT All-Sky Survey data.[3]

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MAssive Cluster Survey

Website	www.ifa.hawaii.edu/~ebeling/clusters/MACS.html
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Cluster candidates that are south of declination -40° cannot be observed from Mauna Kea and fit into the Southern MACS (SMACS) extension. They are also being investigated when facilities are available.[4]

History

One of the galaxy clusters, MACS J0647+7015 was found to have gravitationally lensed the most distant galaxy (MACS0647-JD) then ever imaged, in 2012, by CLASH. The first statistical study of X-ray cavities in distant clusters of galaxies was performed by analyzing the Chandra X-ray observations of MACS. Out of 76 clusters representing a sample of the most luminous X-ray clusters, observers found 13 cut and clear cavities and 7 possible cavities. A new radio halo, as well as a relic applicant, were found in MACS, with the help of the Giant Meterwave Radio Telescope and the Karoo Array Telescope-7. The discovered radio halo has a largest linear scale of about 0.9Mpc. X-ray chosen clusters are almost free of projection effects because they are composed of intrinsically massive, gravitationally collapsed systems.

MACS team

The MACS team consists of:

• Harald Ebeling, University of Hawaii, USA
• Alastair Edge, University of Durham, UK
• J. Patrick Henry, University of Hawaii, USA

Survey notation

Objects are labelled as JHHMM.m+DDMM where HHMM+DDMM are the coordinates in the J2000 system. Here H, D, and M refer to hours, degrees, and minutes, respectively, and m refers to tenths of minutes of time.

• HH Hours of right ascension
• MM.m Minutes of right ascension or declination
• DD.d Degrees in declination

Southern MAssive Cluster Survey

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The Southern MAssive Cluster Survey (SMACS) involved the Hubble Space Telescope.

Notable surveyed objects

References

External links

Wikimedia Commons has media related to Massive Cluster Survey (MACS).

• http://mnras.oxfordjournals.org/content/407/1/83.short
• http://mnras.oxfordjournals.org/content/421/2/1360.short
• http://mnras.oxfordjournals.org/content/458/2/1803.abstract

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