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Proposal Identification No.:

A2766 Arecibo Observatory

Date Received: 2014-Sep-02 18:08:01 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2014. This proposal has been submitted before. The previous proposal number is A2766. Proposal Type: General Category: Sub-Category: Observation Category: Time Requested this semester: Hours Next 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 7.5 7.5 26 depends on the source. 2.5 hr less than 100 GB

Continued Monitoring of the Spectral Line/Continuum Outburst in NGC660.

A radio continuum/spectral-line outburst has been serendipitously discovered by us in NGC660. From Feb. 2013, bi-monthly monitoring of this galaxy has been performed, with eleven observing epochs completed to date. Variability of the continuum spectrum, and of the detailed OH emission/absorption spectra at 4660, 4750, and 4765 MHz have been followed over this period. The rapid changes seen in the molecular emission from the nuclear region of this galaxy are unprecedented. To delineate the physical model of this complicated starburst system further, we are supplementing this Arecibo monitoring by milliarcsecond-resolution HSA (VLBI) line and continuum imaging at quasi-yearly intervals (with Arecibo in the array). The VLBI images reveal jet structure consistent with a recent nuclear outburst. The OH features show association with the outburst hotspots. The Arecibo single-dish and HSA monitoring are highly complimentary and a further year of Arecibo monitoring is requested. Outreach Abstract: Between the billions of stars in a galaxy, space is filled with gaseous material, called the interstellar medium (ISM). Much of this ISM is neutral hydrogen, but there are also giant molecular clouds (GMC) and gaseous nebulae containing ionized and molecular gas and dust. Stars start their lives in GMCs and evolve, the most massive eventually exploding as supernovae and contributing heavy elements back to the ISM. Such processes usually occur over time spans of millions of year. In the unusual galaxy called NGC 660, we have discovered a sudden change in its radio energy output, and molecular signatures over just a few years. Such phenomena are rare. During the past eighteen months we have monitored this ob ject bi-monthly from Arecibo and found that it varies even over this short time-scale. In this proposal, we request observing time to continue this monitoring for a further year.

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Name Christopher J Salter Tapasi Ghosh

Institution Arecibo Observatory Arecibo Observatory

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

Phone 787-878-2612 X281 787-878-2612 X289

Student no no

Additional Authors
Robert F. Minchin, Arecibo Observatory, 787-878-2612 X 283, rminchin@naic.edu 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 not needed.

Begin ­ End Interval­Interval 0.5 ­ ­ ­ ­ 3

Days Needed at This Interval 3

Time Constraints (Must Be Justified in the Prop osal Text) Schedule at roughly 2 monthly intervals.

Next Semester Time Request
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Begin ­ End Interval­Interval 0.5 ­ ­ ­ ­ 3

Days Needed at This Interval 3

Time Constraints (Must Be Justified in the Prop osal Text) Schedule at roughly 2 monthly intervals.

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: We would like availability of as many of our requested receivers as possible. However, the C-band receiver is essential.

Section IV - RFI Considerations Frequency Ranges Planned

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
NGC660 01 43 02.4 +13 38 42 BPCal 01 41 09.1 +13 53 28

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