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O B S E R V A T I O N   C A T A L O G

OBSID:
29435
 Title:
A Search for Pulsar Filaments         
Investigator:
Romani
 Observer:
Romani, Roger
 Phone:
650-725-7595
 Email:
rwr@astro.stanford.edu
Target Name:
PSR J1835-1020
 Sequence Number:
503379
 Instrument:
ACIS-I
 Grating:
NONE
 SI Mode:
TE_0046CB
 Raster Scan:
N
 Annotated DOT:
JUL1524a

Proposal Number:
24500086
 Right Ascension:
278.99
 Declination:
-10.3347
 Status:
archived
 Start Date:
2024-07-19 20:19:18
Category:
SN, SNR AND ISOLATED NS
 Type:
GO
 AO Cycle:
24
 Dither Flag:
Y
 Y Offset:
-2
 Z Offset:
2
Est. Count Rate:
0.01
 Order-1 Count Rate:

 Exposure Time:
12
 Time Remaining:
11.990
 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:
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:
The rare misaligned pulsar filaments (e.g. the Guitar nebula filament) represent an important channel for the escape of multi-TeV e+/e- to the ISM, likely enabled by a small bow shock stand-off distance. From the ATNF catalog, we select pulsars expected to have small stand-off and find that almost none have had sensitive X-ray observations. From the best such candidates, we identify a set with small CXO resource cost. We also develop a new statistic capable of identifying filaments comparable to the faintest long filament known, using modest ACIS exposures. Our survey could double the number of known pulsar filaments, helping test their physical nature and importance for the Galactic cosmic ray positrons.

psci Run:
8
 Processing Date:
Aug 11 2024
 psci Directory:
/nfs/maaxnew/r3/fn/acis128a/acis128.log
OBSID:
29435
 SIM Mode:
ACIS-I
 OTG Mode:
NONE
 Seq Number:
503379
 Target Name:
PSR_J1835-1020
 AO:
24
Start VCDU:
55627:032
 Start Time (UTC):
201:73959.136
 Stop Time (UTC):
201:85964.324
 Kilosecs:
12.0
 % Frames:
100.0
 # CCDs:
I4
# Frames:
3822
 # Events:
195962
 Events/sec:
16
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
0
 FP Temp:
-106.8
Parameter Block:
0x006e6034
 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:
8

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