C H A N D R A   S C I E N C E   C E N T E R
O B S E R V A T I O N   C A T A L O G

OBSID:
26348
 Title:
SEARCHING FOR THE X-RAY COUNTERPART OF GEV SOURCE FERMI J1913+0515   
Investigator:
Li
 Observer:
Li, Jian
 Phone:
+86 0551-63601861
 Email:
jianli@ustc.edu.cn
Target Name:
Fermi J1913+0515
 Sequence Number:
402310
 Instrument:
ACIS-I
 Grating:
NONE
 SI Mode:
TE_006E6B
 Raster Scan:
N
 Annotated DOT:
FEB2822a

Proposal Number:
23400271
 Right Ascension:
288.276
 Declination:
5.26542
 Status:
archived
 Start Date:
2022-03-01 21:26:37
Category:
BH AND NS BINARIES
 Type:
GO
 AO Cycle:
23
 Dither Flag:
Y
 Y Offset:
0
 Z Offset:
0
Est. Count Rate:
0.0027
 Order-1 Count Rate:

 Exposure Time:
20.4
 Time Remaining:
18.978
 Reqd Start Time:

 Reqd Stop Time:
Period:
162.25
 Epoch:
59570.7
 Start of Period:
0.25
 End of Period:
0.5
 PS Margin:
0
 PE Margin:
0
 Max Segments:
0

ACIS Mode:
TE
 Standard?:
No
 BEP Mode:
VF
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:
Microquasars are binary systems comprising a compact object and a companion star. Steady gamma-ray emission is expected to arise from their central objects, or from interactions between their outflows and surrounding medium. Li et al. (2020) analyzed more than ten years of Fermi/LAT data on SS 433, discovered GeV emission in the vicinity of SS 433, co-spatial with a gas enhancement. It (Fermi J1913+0515) shows a periodic variation at the precessional period of SS 433, linking it with the microquasar. This result challenges obvious interpretations and is unexpected from any previously published theoretical models. The nature of Fermi J1913+0515 remains unclear. We propose one 50ks Chandra observation on Fermi J1913+0515 to search for its X-ray counterpart and explore its possible nature.

psci Run:
76
 Processing Date:
Mar 3 2022
 psci Directory:
/nfs/maaxnew/r3/fe/acis119a/acis119.log
OBSID:
26348
 SIM Mode:
ACIS-I
 OTG Mode:
NONE
 Seq Number:
402310
 Target Name:
Fermi_J1913+051
 AO:
23
Start VCDU:
126708:088
 Start Time (UTC):
060:78480.982
 Stop Time (UTC):
061:11071.572
 Kilosecs:
19.0
 % Frames:
100.0
 # CCDs:
I4
# Frames:
6046
 # Events:
547656
 Events/sec:
28
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
0
 FP Temp:
-115.1
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:
76

pgf@space.mit.edu Sat Mar 29 10:37:19 EST 2025