Astronomy: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]
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
The Southern MAssive Cluster Survey (SMACS) involved the Hubble Space Telescope.
Notable surveyed objects
| Survey object | Right ascension | Declination | Notes |
|---|---|---|---|
| MACS J0025.4-1222 | 00h 25.4m | −12° 22′ | |
| MACS J0358.8-2955 | 03h 58.8m | −29.5° | Part of Abell 3192[5] |
| MACS J0416.1-2403 | 04h 16m 9.9s | −24° 03′ 58″ | |
| MACS J0647+7015 | 06h 47m | +70° 15′ | |
| MACS J0717.5+3745 | 07h 17.5m | +37° 45′ | |
| SMACS J0723.3–7327 | 07h 23m | −73° 27′ | Subject of first JWST deep field |
| MACS J1149 Lensed Star 1 | 11h 49m 35.59s | 22° 23′ 47.4″ | Blue supergiant star observed through a gravitational lens |
| MACS 1423-z7p64 | 14h 23m | 24° 04′ | Most distant galaxy known as of April 2017 |
| MACS 2129-1 | 21h 29m | −1° |
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. doi:10.1086/320958. Bibcode: 2001ApJ...553..668E.
- ↑ 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. doi:10.1086/518603. Bibcode: 2007ApJ...661L..33E.
- ↑ MAssive Cluster Survey (MACS)
- ↑ Repp, A; Ebeling, H (2018-09-01). "Science from a glimpse: Hubble SNAPshot observations of massive galaxy clusters". Monthly Notices of the Royal Astronomical Society 479 (1): 844–864. doi:10.1093/mnras/sty1489. ISSN 0035-8711. https://doi.org/10.1093/mnras/sty1489.
- ↑ NASA: Hubble Views a Double Cluster of Glowing Galaxies
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
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