کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1779702 | 1022020 | 2008 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Spectral spatial fluctuations of CMBR: Strategy and concept of the experiment
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
نجوم و فیزیک نجومی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Spectral spatial fluctuations (SSF) of the cosmic microwave background radiation (CMBR) temperature are considered as a result of an interaction of primordial atoms and molecules with CMBR in proto-objects moving with peculiar velocities relative to the CMBR. Expected optimistic values of ÎT/T are 2 Ã 10â5-2 Ã 10â6 for SSF caused by HeH+ at z = 20-30 which are possible redshifts of early reionization scenario. The bandwidth of the lines is 0.1-2% depending on the scale of proto-objects and redshifts. For the SSF search CMBR maps in different spectral channels are to be observed and then processed by the Difference method. Simulation of the experiment is made for MSRT (Tuorla Observatory, Finland) equipped with a 7 Ã 4 beam cryo-microbolometer array with a chopping flat and frequency multiplexer providing up to seven spectral channels in each beam (88-100 GHz). Expected ÎT/T limit in the experiment is 2 Ã 10â5 with 6â²-7â² angular and 2% frequency resolution. Simulation shows that SSF may be recognized in the angular power spectrum when S/N in single frequency CMBR maps is as small as 1.17 or even something less for white noise. Such an experiment gives us a possibility to set upper limit of SSF in MM band and prepare future SSF observations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: New Astronomy - Volume 13, Issue 1, January 2008, Pages 28-40
Journal: New Astronomy - Volume 13, Issue 1, January 2008, Pages 28-40
نویسندگان
Viktor Dubrovich, Anisa Bajkova, V.B. Khaikin,