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OBSID:
24347
 Title:
A candidate bullet in the Planck SZ Catalogue      
Investigator:
Rossetti
 Observer:
Rossetti, Mariachiara
 Phone:
+390223699468
 Email:
mariachiara.rossetti@inaf.it
Target Name:
PSZ2 G282.28+49.94
 Sequence Number:
801920
 Instrument:
ACIS-I
 Grating:
NONE
 SI Mode:
TE_0046CB
 Raster Scan:
N
 Annotated DOT:
MAR2921a

Proposal Number:
22800424
 Right Ascension:
179.504
 Declination:
-10.7731
 Status:
archived
 Start Date:
2021-03-30 11:35:47
Category:
CLUSTERS OF GALAXIES
 Type:
GO
 AO Cycle:
22
 Dither Flag:
Y
 Y Offset:
-2.5
 Z Offset:
3
Est. Count Rate:
0.088
 Order-1 Count Rate:

 Exposure Time:
12.6
 Time Remaining:
12.556
 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 S3
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:
We propose joint Chandra (146 ks) and HST (5 orbits) observations of PSZ2 G282.28+49.94, a candidate ``bullet-like" cluster. It features a cometary shape and a very large offset (350 kpc) between the X-ray peak and a galaxy clump, suggesting that it is undergoing a major merger shortly after core passage. In this phase, the collisionless components of the cluster are maximally separated from the collisional ICM, as in the Bullet Cluster, and their separation can provide constraints to the DM cross section. The large separation makes PSZ2 G282.28+49.94 a very promising target for these studies. The requested observations will allow us to map both the ICM and the DM distribution, to infer the dynamical history of this extreme object and to measure the offset between DM, gas and galaxies.

psci Run:
71
 Processing Date:
Apr 18 2021
 psci Directory:
/nfs/maaxnew/r3/fa/acis115b/acis115.log
OBSID:
24347
 SIM Mode:
ACIS-I
 OTG Mode:
NONE
 Seq Number:
801920
 Target Name:
PSZ2_G282.28+49
 AO:
22
Start VCDU:
26981:048
 Start Time (UTC):
089:43139.818
 Stop Time (UTC):
089:55708.546
 Kilosecs:
12.6
 % Frames:
100.0
 # CCDs:
I6
# Frames:
3878
 # Events:
590112
 Events/sec:
46
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
0
 FP Temp:
-119.2
Parameter Block:
0x0046c034
 Window Block:
-
 # Windows:
0
 FEP Mode:
Te5x5
 BEP Mode:
F
 Start Row:
0
 # Rows:
1024
Primary Exposure:
32
 Secondary Exposure:
0
 Duty Cycle:
0
 Summing?:
No
 Bias?:
Yes
 Trickle?:
Yes
 Bias Run:
71

pgf@space.mit.edu Mon Mar 31 10:36:39 EST 2025