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OBSID:
25241
 Title:
CRITICAL NEW CONSTRAINTS ON ULX AND LUMINOUS HMXB POPULATIONS IN EXTREME METAL POOR GALAXIES
Investigator:
Lehmer
 Observer:
Lehmer, Bret
 Phone:
479-575-5928
 Email:
lehmer@uark.edu
Target Name:
UGC 4393
 Sequence Number:
601566
 Instrument:
ACIS-S
 Grating:
NONE
 SI Mode:
TE_004A4B
 Raster Scan:
N
 Annotated DOT:
MAY1622a

Proposal Number:
23620243
 Right Ascension:
126.518
 Declination:
45.9676
 Status:
archived
 Start Date:
2022-05-22 16:58:52
Category:
NORMAL GALAXIES
 Type:
GO
 AO Cycle:
23
 Dither Flag:
Y
 Y Offset:
0
 Z Offset:
0
Est. Count Rate:
0.0032
 Order-1 Count Rate:

 Exposure Time:
19
 Time Remaining:
18.771
 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:
I2 I3 S1
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:
Recent studies have shown that the HMXB X-ray luminosity function scaling with SFR increases with declining metallicity. In the high-redshift Universe, when metallicities were relatively low and galaxies were more actively star-forming, HMXBs are expected to have dominated the X-ray emissivity of the Universe and could have provided an important source of IGM heating. We propose to conduct moderately-deep Chandra imaging of five extreme metal poor galaxies (XMPs), which have gas-phase metallicities in the range of 0.07-0.19 solar. These properties are comparable to those of typical z ~ 8 galaxies. We will increase the number of luminous HMXBs detected in XMPs by a factor of ~5 to significantly improve constraints on the X-ray scaling relations from this critical population.

psci Run:
69
 Processing Date:
May 24 2022
 psci Directory:
/nfs/maaxnew/r3/ff/acis120a/acis120.log
OBSID:
25241
 SIM Mode:
ACIS-S
 OTG Mode:
NONE
 Seq Number:
601566
 Target Name:
UGC_4393
 AO:
23
Start VCDU:
80070:032
 Start Time (UTC):
142:62554.136
 Stop Time (UTC):
142:81335.936
 Kilosecs:
18.8
 % Frames:
100.0
 # CCDs:
I6
# Frames:
5795
 # Events:
889284
 Events/sec:
47
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
0
 FP Temp:
-113.2
Parameter Block:
0x004a4034
 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:
69

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