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OBSID:
29179
 Title:
Simultaneous Chandra and XRISM Spectroscopy of NGC 4151     
Investigator:
Miller
 Observer:
Miller, Jon
 Phone:
617 529 5725
 Email:
jonmm@umich.edu
Target Name:
NGC 4151
 Sequence Number:
705150
 Instrument:
ACIS-S
 Grating:
HETG
 SI Mode:
TE_0088EB
 Raster Scan:
N
 Annotated DOT:
DEC2523b

Proposal Number:
24708948
 Right Ascension:
182.636
 Declination:
39.4059
 Status:
archived
 Start Date:
2023-12-26 12:10:13
Category:
ACTIVE GALAXIES AND QUASARS
 Type:
DDT
 AO Cycle:
24
 Dither Flag:
Y
 Y Offset:
0
 Z Offset:
0
Est. Count Rate:
1.2
 Order-1 Count Rate:
1.2
 Exposure Time:
18
 Time Remaining:
17.612
 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:
F
 Dropped Chip Count:
0
 Optional Chips:
S0 S5
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:
XRISM is currently scheduled to observe NGC 4151 on Dec 27, 2023, for 45 ks. This is the first of four planned XRISM exposures; the rest will likely be taken in late April 2024. Below 4 keV, the HETGS offers superior resolution to the Resolve calorimeter. Simultaneous - or at least contemporaneous observations - will provide the best opportunity to study the variable absorption and winds in NGC 4151, the nature and origin of the narrow Fe K line, and to search for relativistic disk reflection. NuSTAR will also observe NGC 4151 providing coverage of the ionizing continuum out to 79 keV, but no coverage below 3 keV. Chandra spectroscopy is essential for characterizing the lines and absorption edges at low energy that ultimately shape the continuum through the Fe K band, where the strongest outflows and relativistic disk reflection are evident. [Submitted on behalf of the XRISM team; additional communication with the Director includes some privileged information.]

psci Run:
191
 Processing Date:
Jan 3 2024
 psci Directory:
/nfs/maaxnew/r3/fl/acis126b/acis126.log
OBSID:
29179
 SIM Mode:
ACIS-S
 OTG Mode:
HETG
 Seq Number:
705150
 Target Name:
NGC_4151
 AO:
24
Start VCDU:
36392:104
 Start Time (UTC):
360:45113.710
 Stop Time (UTC):
360:62738.463
 Kilosecs:
17.6
 % Frames:
100.0
 # CCDs:
S6
# Frames:
5438
 # Events:
588219
 Events/sec:
33
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
1
 FP Temp:
-115.2
Parameter Block:
0x0088e024
 Window Block:
-
 # Windows:
0
 FEP Mode:
Te3x3
 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:
191

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