Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/MomjiantagA2234tp.pdf Дата изменения: Thu Nov 17 22:05:03 2011 Дата индексирования: Mon Feb 4 22:15:06 2013 Кодировка: Поисковые слова: arp 220

Proposal Identification No.:

A2234

Date Received: 2006 -Jun-04 15:35:32

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Extragalactic 28 Hours 2 hours

Probing the ISM of Arp 220 ­ A Cm-Wavelength Spectral-line Census

We propose making an Arecibo spectral-line census for the prototype ULIRG, Arp 220, to investigate its various atomic/molecular-line transitions (both in emission and absorption) using full coverage of L-band and from 3 to 10 GHz. Included are a huge number of Radio Recombinations Lines (RRLs) to better constrain RRL emission models, while the molecular-line census will allow better understanding of nuclear starbursts in ULIRGs. Within this census, we will observe the 6.7-GHz methanol maser line, as yet undetected beyond the Local Group. This will determine whether methanol masers in ULIRGs exhibit kilo/megamasing compared to Galactic examples, as with 18-cm OH. Although scientifically focused, the pro ject also addresses several technical ob jectives. Arp 220 being a strong continuum emitter, we will investigate the necessity of Double Position Switching (commonly used at L-band) for frequencies between 2 and 10 GHz. Moreover, considering the great Arp-220 line-widths and the multiple transitions of some lines, including RRLs, we will use the pro ject to "shake down" the 8-subcorrelator (800-MHz bandwidth) single-pixel capability of the WAPP spectrometer, which is just being implemented.

Name Emmanuel A Momjian

Institution Arecibo Observatory/NAIC

E-mail emomjian@naic.edu

Phone 787 878 2612 extn. 251

Student no

Remote Observing Request

X

Observer will travel to AO Remote Observing In Absentia (instructions to operator)

Instrument Setup
L-wide C X-high S-high C-high

Atmospheric Observation Instruments:

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Sp ecial Equipment or setup: This proposal requires the use of the 800-MHz, single-pixel capability of the WAPPs to be in place before it can commence (will require double of the requested telescope time otherwise).

RFI Considerations Frequency Ranges Planned
1100 - 10,000 MHz This proposal requires Iridium RFI protection at 1612 MHz between 10pm and 6am EST. This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz.. This proposal requires coordination with GPS L3 at 1381 MHz.

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