Twice a month
multiple line transitions from the 3mm, 2mm and 1mm band are observed in at
least one of several calibration sources. The center line velocities, antenna
temperatures and velocity integrated antenna temperatures (Gaussian fits) are
then compared to previous results to check for consistency. Since monitoring of
the calibration sources tests the performance of the complete telescope system
its results are probably most relevant for the observer. However, this also
means that any deviations apparent can have several causes (pointing, wind and
weather, receivers) and thus only large, consistent deviations will be investigated
in detail.
In
the next table the Intcal Monitoring program is presented in terms of the main
observing parameters for each object and line:
|
|
|
IRC+10216 |
M17SW |
Orion KL |
WB947 |
|
R.A. (1950.0) |
|
09:45:15.0 |
18:17:30 |
05:32:47.0 |
07:02:57.2 |
|
Dec. (1950.0) |
|
+13:30:45.0 |
-16:13:00 |
-05:24:23.0 |
-12:15:24.0 |
|
Pointing Source |
|
R Leo |
vx Sgr |
Orion SiO |
Orion SiO |
|
Enter Sun limit |
|
June 26th |
November 7th |
April 30th |
June 1st |
|
Exit Sun limit |
|
October 7th |
February 13th |
July 28th |
August 20th |
|
Transition |
|
CO (1-0) |
CS (2-1) |
CO (1-0) |
CO (1-0) |
|
|
|
CS (3-2) |
CS (3-2) |
CS (3-2) |
CO (2-1) |
|
|
|
CO (2-1) |
CO (2-1) |
CO (2-1) |
|
|
AOS |
|
HRS + LRS |
HRS |
HRS + LRS |
HRS |
|
VLSR |
|
-26.2 km/s |
+20.0 km/s |
+5.0 km/s |
+10.0 km/s |
|
Obsmode |
|
BSW |
PSW |
PSW |
PSW |
|
|
|
|
-22' 22' Rel |
-0.5d 0 Rel |
-1d 0 Rel |
|
Inttime
Spe/Ref/Cal |
|
120 / 120 / 5 |
60 / 60 / 5 |
60 / 60 / 5 |
60 / 60 / 5 |
|
IRC+10216 Observing Procedure
|
Point & focus on IRC+10216
Aim antenna to IRC+10216 (Use pointing catalog)
Connect RX100:HRS
Line CO (1-0)
Tune & Rectemp
Obsmode Wide Single Beam
Switch
3 loop pointing / focus sequence (HPBW Spacing 40” 40”)
Connect RX100:HRS+LRS
Rectemp
Set the observing mode to Wide Dual
Beam Switch
Inttime Spe/Ref/Cal 120/120/5
Take a 1 / 1 integrate cycle,
calibrate at the beginning, save and zero average
Connect RX150:HRS + LRS
Line CS (3-2)
Tune
Rectemp
Set the observing mode to Wide dual
beam Switch
Inttime Spe/Ref/Cal 120/120/5
Take a 1 / 1 integrate cycle,
calibrate at the beginning, save and zero average
Point & focus on IRC+10216
Aim antenna to IRC+10216 (Use pointing catalog)
Connect RX115:HRS
Line CO (1-0)
Tune & Rectemp
Obsmode Wide Single Beam
Switch
3 loop pointing / focus sequence (HPBW Spacing 40” 40”)
Connect RX100:HRS+LRS
Rectemp
Set the observing mode to Wide Dual
Beam Switch
Inttime Spe/Ref/Cal 120/120/5
Take a 1 / 1 integrate cycle,
calibrate at the beginning, save and zero average
Aim the antenna to IRC+10216
Connect RX230 to HRS + LRS
Line CO (2-1)
Tune
Rectemp
Set the observing mode to Wide dual
beam Switch
Inttime Spe/Ref/Cal 120/120/5
Take a 1 / 1 integrate cycle,
calibrate at the beginning, save and zero average
|
M17SW Observing Procedure
|
Aim the antenna to vx Sgr
Connect RX100 to HRS
Line SiO (2-1, v=1)
Tune
3 loops pointing sequence
3 loops focus sequence
Aim the antenna to M17SW
Connect RX100 or RX115 to HRS
Line CS (2-1)
Tune
Rectemp
Set the observing mode to Position
switching mode (Refpos –22’ 22’ rel)
Inttime Spe/Ref/Cal 60/60/5
Take a 1 / 1 integrate cycle,
calibrate at the beginning, save and zero average
Aim the antenna to M17SW
Connect RX150 to HRS
Line CS (3-2)
Tune
Rectemp
Set the observing mode to Position
switching mode (Refpos –22’ 22’ rel)
Inttime Spe/Ref/Cal 60/60/5
Take a 1 / 1 integrate cycle,
calibrate at the beginning, save and zero average
Aim the antenna to M17SW
Connect RX230 to HRS
Line CO (2-1)
Tune
Rectemp
Set the observing mode to Position
switching mode (Refpos –22’ 22’ rel)
Inttime Spe/Ref/Cal 60/60/5
Take a 1 / 1 integrate cycle,
calibrate at the beginning, save and zero average
|
Orion KL Observing Procedure
|
Aim the antenna to Orion SiO
Connect RX100 to HRS
Line SiO (2-1, v=1)
Tune
3 loops pointing sequence
3 loops focus sequence
Aim the antenna to Orion KL
Connect RX100 or RX115 to HRS + LRS
Line CO (1-0)
Tune
Rectemp
Set the observing mode to Position
switching mode (Refpos –0.5° 0 rel)
Inttime Spe/Ref/Cal 60/60/5
Take a 1 / 1 integrate cycle,
calibrate at the beginning, save and zero average
Aim the antenna to Orion KL
Connect RX150 to HRS + LRS
Line CS (3-2)
Tune
Rectemp
Set the observing mode to Wide dual
beamswitching
Inttime Spe/Ref/Cal 120/120/5
Take a 1 / 1 integrate cycle,
calibrate at the beginning, save and zero average
Aim the antenna to Orion KL
Connect RX230 to HRS + LRS
Line CO (2-1)
Tune
Rectemp
Set the observing mode to Position
switching mode (Refpos –0.5° 0 rel)
Inttime Spe/Ref/Cal 60/60/5
Take a 1 / 1 integrate cycle,
calibrate at the beginning, save and zero average
|
WB947 Observing Procedure
|
Aim the antenna to Orion SiO
Connect RX100 to HRS
Line SiO (2-1, v=1)
Tune
3 loops pointing sequence
3 loops focus sequence
Aim the antenna to WB947
Connect RX100 or RX115 to HRS
Line CO (1-0)
Tune
Rectemp
Set the observing mode to position switching
(Refpos –1° 0 rel)
Inttime Spe/Ref/Cal 60/60/5
Take a 1 / 1 integrate cycle,
calibrate at the beginning, save and zero average
Aim the antenna to WB947
Connect RX230 or HRS
Line CO (2-1)
Tune
Rectemp
Set the observing mode to position
switching (Refpos –1° 0 rel)
Inttime Spe/Ref/Cal 60/60/5
Take a 1 / 1 integrate cycle,
calibrate at the beginning, save and zero average