MAssive Cluster Survey
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]
| Survey type | astronomical survey  |
|---|---|
| Website | www |
 Related media on Wikimedia Commons | |
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
Notable surveyed objects
| Survey object | Right ascension | Declination | Notes |
|---|---|---|---|
| MACS J0025.4-1222 | 00h 25.4m | −12° 22′ | |
| MACS J0647+7015 | 06h 47m | +70° 15′ | |
| MACS J0717.5+3745 | 07h 17.5m | +37° 45′ | |
| MACS 1423-z7p64 | 14h 23m | 24° 04′ | The most distant galaxy known as at April 2017 |
References
- Ebeling, Harald; Alastair Edge; J. Patrick Henry (2001). "MACS: A Quest for the Most Massive Galaxy Clusters in the Universe". Astrophysical Journal. 553 (2): 668. arXiv:astro-ph/0009101. Bibcode:2001ApJ...553..668E. doi:10.1086/320958.
- Ebeling, Harald; Elizabeth Barrett; David Donovan; Cheng-Jiun Ma; Alastair Edge; Leon van Speybroeck (2007). "A Complete Sample of 12 Very X-Ray Luminous Galaxy Clusters at z > 0.5". Astrophysical Journal Letters. 661 (661): 33. arXiv:astro-ph/0703394. Bibcode:2007ApJ...661L..33E. doi:10.1086/518603.
- MAssive Cluster Survey (MACS)
See also
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Wikimedia Commons has media related to Massive Cluster Survey (MACS). |
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