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: http://www.naic.edu/alfa/ealfa/meeting1/minutes/ALFALFAsprouts.html
Дата изменения: Mon May 8 23:01:34 2006 Дата индексирования: Sun Dec 23 04:14:10 2007 Кодировка: Поисковые слова: occultation |
To test strategies for ALFA, we have considered different schemes to map fields in 4 ways:
The sensitivity across a strip mapped via different telescope motion schemes was tested:
| Paulo F. | PALFA would be happy to piggyback ZoA survey. |
| Wim vD. | This is obviously a lot of work. The big surveys will be good. Let's not have long discussions now, but only a few comments. |
| Jon D. | In Virgo, covering sky area doesn't gain you because the volume is constrained. Rather, you need to go lower than 107 solar masses. To do that, you'll need to integrate longer to go to lower masses. |
| Riccardo | True. This exercise is of the strawman's kind. |
| Steve S. | There is some evidence that the HIMF is much flatter in the Virgo region than in the field, and may look more like the Zwaan et al. HIMF. Hence, there may be fewer galaxies at low mass. |
| Lister | Nyquist sampling is always a good idea, but the pulsar folks are not interested in Nyquist sampling. |
| Riccardo | But, at some point, we are going to have to figure out what we are all willing to compromise, given the pressure for telescope time. For weak detections, we may have to do repeat observations to follow up. |
| Desh | Actually, the pulsar folks would propose also Nyquist sampling since they want a second pass for reconfirmation. |
| Riccardo | Others might also be interested in the fast survey to look for transients, if it also repeats. |
| Lister | You need 3 passes, 1.5 arcmin in each direction for this array. |
| Desh | If you fill in the overlap region, you can get to Nyquist sampling with 2 passes. |
| Chris S. | Rather than staring for pulsar observations, you can also do very slow OTF mapping. |