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Дата изменения: Tue Sep 11 04:14:23 2012
Дата индексирования: Mon Feb 4 22:42:08 2013
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Поисковые слова: arp 220

Proposal Identification No.:

A2765 Arecibo Observatory

Date Received: 2012-Sep-04 17:02:22 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2012. This proposal has been submitted before. The previous proposal number is A2714. Proposal Type: General Category: Sub-Category: Observation Category: Time Requested this semester: Hours already used for this pro ject: Additional Hours required to complete pro ject: Minimum Useful Time: Expected Data Storage: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Extragalactic 90.75 0 2.75 hr less than 100 GB

A Deep Arecibo 1 to 10 GHz Spectral Scan of Arp 220

Following our earlier, shallow Arecibo spectral scan of Arp 220, we propose a follow-up, deep survey using the Mock spectrometer in "single-pixel" mode. This should more than double the signal-to-noise ratio of the data, and among the expected detection of a large number of new molecular lines, we anticipate species and isotopologues that will be new for these frequencies. The results will contribute to our understanding of the physical and chemical conditions in the central regions of this prototype Ultra Luminous Infra-Red Galaxy (ULIRG). Essentially the whole frequency range between 1.1 and 10.0 GHz will be searched with noise levels at, and below, 60 µJy beam-1 for a velocity resolution of 30 kms-1 . A total of 90 hr observing time is requested. Outreach Abstract: We propose using the world's largest radio telescope between 1 and 10 GHz to discover new spectral lines due to molecules and ionized hydrogen atoms in the prototype ultra-luminous infra-red galaxy, Arp 220. This ob ject represents the collisional merger of a pair of galaxies, and is forming stars at about 100 times the rate of our own Milky Way. Our recent "first-look" survey of Arp 220 discovered, amongst other species, the prebiotic molecule methanimine (CH2 NH), and transitions of hydrogen cyanide (HCN) previously unseen at radio wavelengths. We expect equally exciting discoveries from this much deeper survey. The results will be used to understand the physical and chemical conditions in the central regions of this unique ob ject.

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Name Christopher J Salter Robert F Minchin

Institution Arecibo Observatory Arecibo Observatory

E-mail csalter@naic.edu rminchin@naic.edu

Phone 787 878 2612 X 281 7878782612 X 283

Student no no

Additional Authors
Tapasi Ghosh Arecibo Observatory tghosh@naic.edu Mayra Lebron University of Puerto Rico - RP mayra.lebron3@upr.edu smartin@eso.org Mikael Lerner Onsala Space Observatory mikael.lerner@chalmers.se Sergio Martin European Southern Observatory Emmanuel Momjian EVLA - NRAO emomjian@nrao.edu

This work is not part of a thesis.

Remote Observing Request

X

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

Section I I - Time Request
The following times are in LST. For these observations night-time is required.

Begin End IntervalInterval 14:15 17:00

Days Needed at This Interval 33

Time Constraints (Must Be Justified in the Prop osal Text)

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Night time only to obtain the best possible spectral baselines.

Section I I I - Instruments Needed
L-wide C S-low X-band S-high C-high

Atmospheric Observation Instruments:

Sp ecial Equipment or setup: All receivers requested have equal priority, but not all need to be available at the same time.

Section IV - RFI Considerations Frequency Ranges Planned
1100 - 10,000 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.

Section V - Observing List Target List
Arp220 15 34 57.3 +23 30 11 BP Cal 15 31 50.7 +24 02 43

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