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OBSID:
26927
 Title:
A first look at two newly discovered MeerKAT minihalos     
Investigator:
O'Sullivan
 Observer:
O'Sullivan, Ewan
 Phone:
6174957956
 Email:
eosullivan@cfa.harvard.edu
Target Name:
MCXCJ0027.3-5015
 Sequence Number:
802041
 Instrument:
ACIS-I
 Grating:
NONE
 SI Mode:
TE_00458B
 Raster Scan:
N
 Annotated DOT:
MAY2923a

Proposal Number:
24800107
 Right Ascension:
6.83671
 Declination:
-50.246
 Status:
archived
 Start Date:
2023-05-30 15:07:44
Category:
CLUSTERS OF GALAXIES
 Type:
GO
 AO Cycle:
24
 Dither Flag:
Y
 Y Offset:
-1
 Z Offset:
1
Est. Count Rate:
0.245
 Order-1 Count Rate:

 Exposure Time:
20
 Time Remaining:
20.075
 Reqd Start Time:

 Reqd Stop Time:
Period:

 Epoch:

 Start of Period:

 End of Period:

 PS Margin:

 PE Margin:

 Max Segments:
0

ACIS Mode:
TE
 Standard?:
No
 BEP Mode:
VF
 Dropped Chip Count:
0
 Optional Chips:
S2
On-Chip Summing?:
No
 Row Sum:

 Column Sum:

 Frame Time:
Subarray Mode:
NONE
 Starting Row:
0
 Row Count:
1023
 Subarray Frame Time:

Duty Cycle?:
No
 Cycle Count:
0
 Primary Exp Time:

 Secondary Exp Time:
Event Filter?:
No
 Filter Threshold:

 Filter Range:

 Bias Requested?:
No
 Bias Frequency:

 Bias After?:
No
 Spatial Window?:
No

Abstract:
Radio minihalos are diffuse synchrotron sources of unknown origin which occupy the cool cores of massive clusters, often confined within sloshing fronts. To date only about 25 minihalos are known but additional examples are beginning to be identified by the new generation of radio observatories. We propose snapshot observations of two newly-identified minihalos from the MeerKAT Galaxy Cluster Legacy Survey for which no modern X-ray data is available. With 45ks of ACIS-I time we will determine the basic properties of the host clusters, confirm their cool core status, examine them for signs of sloshing and recent interactions, and characterize the intra-cluster medium in their minihalos, allowing comparison with minihalo formation models and the wider cluster population.

psci Run:
234
 Processing Date:
Jun 5 2023
 psci Directory:
/nfs/maaxnew/r3/fj/acis124c/acis124.log
OBSID:
26927
 SIM Mode:
ACIS-I
 OTG Mode:
NONE
 Seq Number:
802041
 Target Name:
MCXCJ0027.3-501
 AO:
24
Start VCDU:
7830:104
 Start Time (UTC):
150:55471.982
 Stop Time (UTC):
150:75561.986
 Kilosecs:
20.1
 % Frames:
100.0
 # CCDs:
I5
# Frames:
6396
 # Events:
485341
 Events/sec:
24
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
0
 FP Temp:
-113.7
Parameter Block:
0x00458034
 Window Block:
-
 # Windows:
0
 FEP Mode:
Te5x5
 BEP Mode:
F
 Start Row:
0
 # Rows:
1024
Primary Exposure:
31
 Secondary Exposure:
0
 Duty Cycle:
0
 Summing?:
No
 Bias?:
Yes
 Trickle?:
Yes
 Bias Run:
234

pgf@space.mit.edu Thu Apr 3 20:00:53 EST 2025