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Proposal Identification No.:

V2964

Date Received:

2014-Sep-01 15:56:23

Technical Page
This proposal has not been submitted before. Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular VLBI Spectroscopy Galactic 4 Hours 30 min

Ultra-high resolution observations of hydroxyl masers with Space-VLBI

We request 4 hours (including overhead) of Arecibo time for a non-imaging space-VLBI observations of 4 OH masers with unresolved spots with RadioAstron. The main goal of this pro ject is to estimate correlated flux density, size and brightness temperature of the most compact maser spots. Successful RA-Arecibo measurements will provide space-ground baselines ranging from 4 to 8 Earth diameters, and give the valuable limits on the brightness temperatures and the sizes of individual spots. Fringe detection elucidates the possibility of using masers as tools to measure motions and parallaxes for the sources of a particular category, and provides the necessary input for the studies of their pumping mechanisms. This proposal is submitted as part of the Radioastron maser program .

Name Alexei V Alakoz

Institution Astro Space Center of Lebedev Physical Institute

E-mail rett@asc.rssi.ru

Phone +74953332512

Student no

Remote Observing Request

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

Instrument Setup
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none 1


RFI Considerations Frequency Ranges Planned
1644 - 1676

2