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OBSID:
27804
 Title:
Probing SMBH accretion in an extremely gas-dense and star-forming protocluster at z=4.3
Investigator:
Vito
 Observer:
Vito, Fabio
 Phone:
+390516357393
 Email:
fabio.vito@inaf.it
Target Name:
[MCA2018] SPT J2349-56 G
 Sequence Number:
704313
 Instrument:
ACIS-S
 Grating:
NONE
 SI Mode:
TE_005C6B
 Raster Scan:
N
 Annotated DOT:
APR1723a

Proposal Number:
23700087
 Right Ascension:
357.428
 Declination:
-56.6403
 Status:
archived
 Start Date:
2023-04-23 04:51:35
Category:
ACTIVE GALAXIES AND QUASARS
 Type:
GO
 AO Cycle:
23
 Dither Flag:
Y
 Y Offset:
0
 Z Offset:
0
Est. Count Rate:
3e-05
 Order-1 Count Rate:

 Exposure Time:
14.5
 Time Remaining:
13.81
 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:
3
 Optional Chips:
I3 S1 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:
The large gas reservoirs and the high rate of galaxy interaction in high-z protoclusters can provide optimal conditions for fast and possibly obscured supermassive black hole (SMBH) accretion in the galaxy members. We propose a 200 ks Chandra observation of SPT 2349-56, an extremely gas rich, starbursting, and compact z=4.3 protocluster. We aim to detect moderately luminous and heavily obscured AGN among the 29 sub-millimeter galaxies identified in the structure. Together wit a recent Chandra observation of another similar protocluster at z=4.0, the proposed observation will allow us to probe the effect of an extremely overdense and gas-rich environment on SMBH growth at high-redshift, and compare the AGN content in z=4 overdensities with protoclusters at z=2-3 and the field environment.

psci Run:
73
 Processing Date:
Apr 29 2023
 psci Directory:
/nfs/maaxnew/r3/fj/acis124a/acis124.log
OBSID:
27804
 SIM Mode:
ACIS-S
 OTG Mode:
NONE
 Seq Number:
704313
 Target Name:
[MCA2018]_SPT_J
 AO:
23
Start VCDU:
40317:024
 Start Time (UTC):
113:18427.045
 Stop Time (UTC):
113:32247.534
 Kilosecs:
13.8
 % Frames:
100.0
 # CCDs:
S3
# Frames:
4400
 # Events:
494411
 Events/sec:
35
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
0
 FP Temp:
-111.6
Parameter Block:
0x005c6024
 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:
73

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