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Proposal Identification No.: A2713 Date Received: 2012­Mar­01 09:42:52
Technical Page
Proposal Type: Long­term
General Category: Astronomy
Sub­Category: Spectroscopy
Observation Category: Extragalactic
Total Time Requested: 100 (30 spread over 2 yr + 70) Hours
Minimum Useful Time: 2.5 hr
Proposal Title: A Remarkable Spectral Line/Continuum Outburst in LIRG NGC 660
ABSTRACT:
Arecibo observations have detected a radio continuum and spectral­line outburst in the nearby peculiar galaxy,
NGC 660. A new continuum component with GHz­Peaked Spectrum (GPS) emission (S peak # 0.5 ” Jy at 5 GHz) has
emerged between 2008.0 and 2012.0. This outburst has been mimicked by the parallel development of excited­OH
maser emission/absorption in the 4660­, 4750­ and 4765­MHz 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 follow­up projects, (a) to monitor the line and continuum
development of the outburst and, b) to make a full 1.1 to 10 ”
GHz spectral scan of NGC ” 660 to explore its currently
rich molecular spectrum, and its recombination­line emission. This is e#ectively a ``Target­of­Opportunity''
experiment.
Name Institution E­mail Phone Student
Christopher J Salter Arecibo Observatory csalter@naic.edu 7878782612 ext
281
no
Remote Observing Request
X Observer will travel to AO
Remote Observing
In Absentia (instructions to oper­
ator)
Instrument Setup
L­wide C S­low X­band S­high C­high
Atmospheric Observation Instruments:
Special 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 1222­1381 MHz..
This proposal requires coordination with GPS L3 at 1381 MHz.
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