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OBSID:
24506
 Title:
Deep Chandra observations of the strong shock in the merging cluster SPT-CLJ2031-4037
Investigator:
Walker
 Observer:
Walker, Stephen
 Phone:
3016553628
 Email:
saw0041@uah.edu
Target Name:
SPT-CLJ2031-4037
 Sequence Number:
801911
 Instrument:
ACIS-S
 Grating:
NONE
 SI Mode:
TE_006C8B
 Raster Scan:
N
 Annotated DOT:
NOV2921a

Proposal Number:
22800181
 Right Ascension:
307.965
 Declination:
-40.6221
 Status:
archived
 Start Date:
2021-11-30 23:57:29
Category:
CLUSTERS OF GALAXIES
 Type:
GO
 AO Cycle:
22
 Dither Flag:
Y
 Y Offset:
-1
 Z Offset:
0
Est. Count Rate:
0.3
 Order-1 Count Rate:

 Exposure Time:
25
 Time Remaining:
25.060
 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:
2
 Optional Chips:
I2 I3
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:
Galaxy cluster mergers are the most energetic events in the Universe since the Big Bang. In these mergers, a significant fraction of this kinetic energy is transferred into heating the intracluster medium (ICM) through shocks and turbulence. In only a handful of merging clusters have clear, high Mach number shocks (M>2) been identified. This handful of systems provides a powerful and unique insight into the way the ICM is heated, and how the electrons and ions in the ICM equilibrate after heating, which cannot be obtained through any other method. Recently we have identified a new high Mach number shock using brief Chandra data of a newly discovered merging cluster in the SPT survey. A deeper, 220ks, observation is required to fully reveal the history of merging and heating of the ICM.

psci Run:
61
 Processing Date:
Dec 15 2021
 psci Directory:
/nfs/maaxnew/r3/fd/acis118b/acis118.log
OBSID:
24506
 SIM Mode:
ACIS-S
 OTG Mode:
NONE
 Seq Number:
801911
 Target Name:
SPT-CLJ2031-403
 AO:
22
Start VCDU:
18349:096
 Start Time (UTC):
335:01163.921
 Stop Time (UTC):
335:26235.456
 Kilosecs:
25.1
 % Frames:
100.0
 # CCDs:
S4
# Frames:
7982
 # Events:
993209
 Events/sec:
39
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
1
 FP Temp:
-115.4
Parameter Block:
0x006c8034
 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:
61

pgf@space.mit.edu Wed Mar 26 10:00:48 EST 2025