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Proposal Identification No.:

A2713

Date Received:

2012-Mar-01 09:42:52

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Long-term Astronomy Spectroscopy Extragalactic 100 (30 spread over 2 yr + 70) Hours 2.5 hr

A Remarkable Spectral Line/Continuum Outburst in LIRG NGC 660

Arecibo observations have detected a radio continuum and spectral-line outburst in the nearby peculiar galaxy, ~ NGC 660. A new continuum component with GHz-Peaked Spectrum (GPS) emission (Speak 0.5Jy at 5 GHz) has emerged between 2008.0 and 2012.0. This outburst has been mimicked by the parallel development of excited-OH maser emission/absorption in the 4660-, 4750- and 4765-MHz transitions. H2CO absorption is also detected against the new continuum component. The likely nature of this event is either a SN explosion, or an outburst in nucleus of NGC~ 660. Here we request observing time for two follow-up pro jects, (a) to monitor the line and continuum ~ development of the outburst and, b) to make a full 1.1 to 10GHz spectral scan of NGC~ to explore its currently 660 rich molecular spectrum, and its recombination-line emission. This is effectively a "Target-of-Opportunity" experiment.

Name Christopher J Salter

Institution Arecibo Observatory

E-mail csalter@naic.edu

Phone 7878782612 ext 281

Student no

Remote Observing Request

X

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

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

Atmospheric Observation Instruments:

Sp ecial Equipment or setup: (1) We need as many of the listed receivers as possible to be available for each monitoring session (every 2 months). (2) For the spectral scans, the listed receivers will be used 1


in turn. While no single receiver has higher priority, not all need to be available for a given observing session.

RFI Considerations Frequency Ranges Planned
1100 - 10000 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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