Station | Diameter (m) | Tsys (K) | Gain (K/Jy) | Eta (%) | SEFD (Jy) | Comment |
---|---|---|---|---|---|---|
GBT | 100.0 | 140.0 | 0.73 | 26 | 192 | for nighttime observing |
Effelsberg | 80.0 (eff.) |
140.0 | 0.14 | 7.7 | 1000 | - |
Noema (PdB) | 45.0 | 100.0 | 0.41 | 71 | 244 | 10x15m |
Pico Veleta | 30.0 | 100.0 | 0.15 | 60 | 654 | - |
Yebes | 40.0 | 180.0 | 0.10 | 22 | 1782 | - |
VLBA (8x25m) | 25.0 | 100.0 | 0.04 | 22 | 2500 | range is: 0.02-0.04 K/Jy |
KVN (3x21m) | 21.0 | 200.0 | 0.061 | 49 | 3279 | for each 21m antenna |
Onsala | 20.0 | 190.0 | 0.049 | 43 | 3878 | - |
Metsähovi | 14.0 | 200.0 | 0.010 | 18 | 20000 | - |
LMT (prelim) | 50 | 240.0* | 0.39 | 55 | 615 | - |
GLT (prelim) | 12 | 180 | 0.032 | 78 | 5625 | - |
ALMA | 70.7 (eff.) | 75.0 | 1.00 | 70 | 74.9 | 37x12m |
- | Noema | Pico Veleta | Yebes | Onsala | Metsähovi | VLBA | GBT | KVN | LMT | ALMA37 |
---|---|---|---|---|---|---|---|---|---|---|
Effelsberg | 28 |
45 |
75 |
111 |
251 |
89-126 |
25 |
102 |
44 |
15 |
Noema | - | 23 |
37 |
55 |
124 |
44-62 |
12 |
50 |
22 |
8 |
Pico Veleta | - | - | 61 |
90 |
203 |
72-102 |
20 |
82 |
36 |
12 |
Yebes | - | - | - | 148 | 336 |
118-168 |
33 |
136 |
59 |
21 |
Onsala | - | - | - | - | 495 |
175-248 |
49 |
201 |
87 |
30 |
Metsähovi | - | - | - | - | - |
398-563 |
110 |
456 |
197 |
69 |
VLBA | - | - | - | - | - |
141-281 |
39-55 |
161-228 |
70-99 |
24-34 |
GBT | - | - | - | - | - |
- |
- |
45 |
19 |
7 |
KVN | - | - | - | - | - |
- |
- |
- |
80 |
28 |
LMT | - | - | - | - | - |
- |
- |
- |
- |
12 |
Baseline Sensitivity: | to Effelsberg: 15-100 mJy |
to IRAM 30m: 12-90 mJy | |
to GBT: 12-50 mJy | |
to ALMA: 7-30 mJy | |
| |
Array Sensitivity (1 sigma): | 0.097 mJy/hr (Europe+VLBA) |
0.063 mJy/hr (Europe+VLBA+GBT) | |
0.035 mJy/hr (Europe+VLBA+GBT+ALMA) | |
These numbers have to be increased by a factor of exp(tau*A) , i.e. for tau=0.1 and airmass A= 1/sin (elv) = 2, the factor is 1.22 | |
Depending on weather, the phase stability and atmospheric coherence time can vary between 10-180 seconds. |
Assuming the following observing parameters: |
|
MK5B, 2048-16-2 (PFB), single polarisation |
|
500 MHz per polarisation |
|
20.0 sec (typical coherence time) |
|
7.*sigma |
|
2 Bit |
Useful formulae: ![]() |
B. Simulated uv-coverage for the Global 3mm-VLBI Array
1. uv-plot of a source with a declination of 70 degree![]() 2. uv-plot of a source with a declination of 40 degree![]() 3. uv-plot of a source with a declination of 0 degree![]() ![]() ![]() |