The MAssive Cluster Survey (MACS) 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.MAssive Cluster Survey (MACS)
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.
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
The Southern MAssive Cluster Survey (SMACS) involved the Hubble Space Telescope.
Notable surveyed objects Survey object Right ascension Declination Notes MACS J0025.4-1222 MACS J0358.8-2955 Part of Abell 3192NASA: Hubble Views a Double Cluster of Glowing Galaxies MACS J0416.1-2403 MACS J0647+7015 MACS J0717.5+3745 SMACS J0723.3–7327 Subject of first JWST deep field MACS J1149 Lensed Star 1 Blue supergiant star observed through a gravitational lens MACS 1423-z7p64 Most distant galaxy known as of April 2017 MACS 2129-1
References
External links
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