Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/SaltertagA2334tp.pdf Дата изменения: Thu Jun 7 20:26:25 2007 Дата индексирования: Sat Dec 22 22:55:30 2007 Кодировка: Поисковые слова: arp 220

Proposal Identification No.:

A2334

Date Received:

2007-Jun-01 19:59:11

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: Regular Astronomy Spectroscopy Extragalactic 36 Hours 1 hr

A Cm-wavelength Search for Prebiotic (and Other) Molecules in Arp 220-like

Starburst Galaxies
ABSTRACT:
Our on-going Arecibo line search (Pro ject A2234) of the prototypical starburst/megamaser galaxy, Arp 220, has revealed a spectrum rich in molecular transitions. These include the "pre-biotic" molecules, methanimine (CH2 NH) in emission, three v2=1 absorption lines of HCN, and possibly formic acid (HCOOH). In particular, the (rest) frequency range 4450-5300 MHz contains methanimine, formaldehyde, CH and formamide (NH2 CHO) in emission, plus HCN (v2=1, J=4) and three lines of excited-OH in absorption. Our results mark the first distant extragalactic detection of methanimine, a molecule with high relevance to the origins of life. Further, the strong, but previously undetected, cm-wave HCN v2=1 direct l-type lines can aid the study of dense molecular gas and active star-forming regions in starburst galaxies. Consequently, we now propose observing the 4450-5300 MHz band towards 21 "Arp-220"-like galaxies, chosen such that emission and absorption lines of the strength found in Arp 220 would be clearly detected in them.

Name Christopher J Salter

Institution NAIC

E-mail csalter@naic.edu

Phone 787-878 2612 X 281

Student no

Remote Observing Request

X

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

Instrument Setup
C Atmospheric Observation Instruments:

1


Sp ecial Equipment or setup:

none

RFI Considerations Frequency Ranges Planned
4450-5300

2