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OBSID:
26795
 Title:
Chandra's Crucial Role in Identifying a Robust and Practical Accretion-Rate Indicator for Quasars
Investigator:
Shemmer
 Observer:
Shemmer, Ohad
 Phone:
940-369-8110
 Email:
ohad@unt.edu
Target Name:
SDSS J004719.71+014813.9
 Sequence Number:
704716
 Instrument:
ACIS-S
 Grating:
NONE
 SI Mode:
TE_007BCB
 Raster Scan:
N
 Annotated DOT:
NOV1323a

Proposal Number:
24700311
 Right Ascension:
11.8322
 Declination:
1.80388
 Status:
archived
 Start Date:
2023-11-17 21:32:49
Category:
ACTIVE GALAXIES AND QUASARS
 Type:
GO
 AO Cycle:
24
 Dither Flag:
Y
 Y Offset:
0
 Z Offset:
0
Est. Count Rate:
0.00219
 Order-1 Count Rate:

 Exposure Time:
3.2
 Time Remaining:
3.267
 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:
I2 I3
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:
Understanding the rapid growth of supermassive black holes and the assembly of their host galaxies is severely limited by the lack of reliable estimates of black-hole mass and accretion rate in distant quasars. We propose Chandra observations of 54 luminous, high-redshift quasars to boost our ability to identify the most reliable and practical Eddington-ratio indicator. In conjunction with archival data, we will investigate diagnostics of quasar accretion power in the X-ray and UV-optical spectral bands of a carefully selected sample of ~80 sources. We will ``stress test'' these diagnostics, relying critically on the X-ray observable properties, and deliver a prescription for the most robust Eddington-ratio estimate that can be utilized economically at the highest accessible redshifts.

psci Run:
4
 Processing Date:
Dec 9 2023
 psci Directory:
/nfs/maaxnew/r3/fl/acis126a/acis126.log
OBSID:
26795
 SIM Mode:
ACIS-S
 OTG Mode:
NONE
 Seq Number:
704716
 Target Name:
SDSS_J004719.71
 AO:
24
Start VCDU:
65759:056
 Start Time (UTC):
321:78627.724
 Stop Time (UTC):
321:81906.964
 Kilosecs:
3.3
 % Frames:
100.0
 # CCDs:
I5
# Frames:
1044
 # Events:
74814
 Events/sec:
22
 PSCI errors:
0
 % drops:
0.1
 Bias Errs:
0
 FP Temp:
-113.0
Parameter Block:
0x007bc024
 Window Block:
-
 # Windows:
0
 FEP Mode:
Te3x3
 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:
4

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