Figure 1: Simulated mosaic of the NGC 253 data for the 70µm band.
Principal: Chad Engelbracht
Deputy: Karl Gordon, Bill Latter
Data Monkey(s):
Priority: Desired
Downlink Priority: Normal
Analysis Time: 168
Last Updated:
This IOC task is intended to verify the scientific validity of the MIPS Scan pipeline products and to test a long AOR. It is particularly aimed at testing the performance of MIPS imaging on extended targets. The galaxy is a large, fairly symmetric target with a large flux range. If the Si:As droop correction or the Ge:Ga transient correction is not performing adequately, these data will allow us to assess the severity of the effect and perhaps improve the pipeline to minimize the effect.
This task contains many overlapping scan legs and will provide an early test of the performance of our calibration procedures on a large, extended object. We will acquire a normal scan map of NGC 253, which has an observing window that opens on June 13 in 2003 and closes on July 31 2003. We will use a single map with 16 30' scan legs overlapped by 111", at the medium scan rate. If the schedule slips too far to observe this galaxy, potential backup targets are M 110 and IC 1613.
The AOT for this task will generate about 1616 4-second DCEs per array. It requires 2.36 hours, less than the 2.5 hours allocated for this task.
# Please edit this file with care to maintain the
# correct format so that SPOT can still read it.
# Generated by SPOT on: 2/14/2003 15:38:35
HEADER: FILE_VERSION=6.2, STATUS = PROPOSAL
AOT_TYPE: MIPS Scan Map
AOR_LABEL: MIPS-295
AOR_STATUS: new
MOVING_TARGET: NO
TARGET_TYPE: FIXED SINGLE
TARGET_NAME: NGC 253
COORD_SYSTEM: Equatorial J2000
POSITION: RA_LON=0h47m33.12s, DEC_LAT=-25d17m17.6s, PM_RA=0.0", PM_DEC=0.0"
OBJECT_AVOIDANCE: EARTH = YES, OTHERS = YES
REQUIRE_160: YES
SCAN_RATE: medium
FAST_RESET_160: NO
STEP_SIZE: TURNAROUND=111", FORWARD=111"
N_SCAN_LEGS: 16
N_MAP_CYCLES: 1
SCAN_LEG_LENGTH: 0.5
MAP_CENTER_OFFSET: CROSS_SCAN = 0, IN_SCAN = 0
SPECIAL: IMPACT = none, LATE_EPHEMERIS = NO,SECOND_LOOK = NO
RESOURCE_EST: TOTAL_DURATION=8507.2, SLEW_TIME=120.8, SETTLE_TIME=366.0, SLEW_OVERHEAD=180.0, SPECIAL_OVERHEAD=0.0, UPLINK_VOLUME=2179, DOWNLINK_VOLUME=164314752, VERSION=S6.5.2
INTEGRATION_TIME: MIPS_24=41.9,MIPS_70=41.9,MIPS_160=4.2
Array Data Desired:
All Arrays
Data Reformatting Option:
Special Instructions:
The data will be combined into a mosaic for each array using mips_enhancer. The mosaics will be examined for visual defects such as obvious seams at array boundaries, latent images from sources or stimulator flashes, or unrejected cosmic ray hits. If everything goes well, the image mosaics are expected to resemble the simulation shown in Figure 1, which includes noise, cosmic rays, saturation, and a realistic background. On short timescales, the main goal of the analysis is to determine what set of parameters for mips_enhancer produces the best-looking mosaic.
Figure 1: Simulated mosaic of the
NGC 253 data for the 70µm band.