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OBSID:
24411
 Title:
How do Cosmic Plasmas Work? Insights from the Hottest Brightest Cold Front and Gas Perturbations in A2319
Investigator:
Zhuravleva
 Observer:
Zhuravleva, Irina
 Phone:
6502836027
 Email:
zhuravleva@astro.uchicago.edu
Target Name:
A2319
 Sequence Number:
801914
 Instrument:
ACIS-I
 Grating:
NONE
 SI Mode:
TE_0046CB
 Raster Scan:
N
 Annotated DOT:
JUL1023b

Proposal Number:
22800264
 Right Ascension:
290.306
 Declination:
43.8892
 Status:
archived
 Start Date:
2023-07-13 23:29:19
Category:
CLUSTERS OF GALAXIES
 Type:
GO
 AO Cycle:
22
 Dither Flag:
Y
 Y Offset:
0
 Z Offset:
0
Est. Count Rate:
7.3
 Order-1 Count Rate:

 Exposure Time:
40
 Time Remaining:
39.97
 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 a 560 ks observation of A2319 - a nearby, very hot, and the fifth brightest in X-rays, cluster of galaxies - to perform a comprehensive study of plasma physics. Our goal is to probe (i) viscosity in the bulk gas through the density fluctuations power spectra on dissipative scales and (ii) thermal conduction parallel to the magnetic field lines through temperature variation along the cold front. Bulk viscosity has been measured in only one cluster so far, while conduction along the field lines will be probed for the first time. A2319 is uniquely suited to address these problems in reasonable exposure time. We will search for K-H eddies for additional constraints on transport processes and a correlation between radio structures and X-ray fluctuations to test particle acceleration.

Remarks:
The maximum number of counts expected in any of the spectra are ~4e6.

psci Run:
417
 Processing Date:
Jul 25 2023
 psci Directory:
/nfs/maaxnew/r3/fj/acis124e/acis124.log
OBSID:
24411
 SIM Mode:
ACIS-I
 OTG Mode:
NONE
 Seq Number:
801914
 Target Name:
A2319
 AO:
22
Start VCDU:
124651:112
 Start Time (UTC):
194:85755.129
 Stop Time (UTC):
195:39336.636
 Kilosecs:
40.0
 % Frames:
100.0
 # CCDs:
I6
# Frames:
12336
 # Events:
1378444
 Events/sec:
34
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
1
 FP Temp:
-116.5
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:
417

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