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Proposal Identification No.:

V2964 Arecibo Observatory

Date Received: 2014-Sep-01 15:56:23 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2014. This proposal has not been submitted before. 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 VLBI Spectroscopy Galactic 4 4 30 min 100-500 GB

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 . Outreach Abstract: RadioAstron is the second space-VLBI program to observe hydroxyl cosmic masers after the VSOP mission. Successful RadioAstron-Arecibo measurements will provide the valuable limits on the brightness temperatures and the sizes of individual spots of Galactic OH maser sources. Water and hydroxyl masers are found in star-forming regions of our and nearby galaxies, around mass-loosing evolved stars, and in accretion discs around super-massive black holes in external galaxies. Due to their small angular sizes and high flux densities, masers proved to be precise instruments for studies of kinematics and physical parameters of of the ob jects throughout the entire Galaxy and even in the other galaxies.

Name Alexei V Alakoz

Andrey M Sobolev

Institution Astro Space Center of Lebedev Physical Institute Ural Federal University

E-mail rett@asc.rssi.ru

Phone +74953332512

Student no

andrej.sobolev@urfu.ru

no

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Additional Authors
Malcolm Gray, malcolm.gray@manchester.ac.uk Hiroshi Imai, hiroimai@sci.kagoshima-u.ac.jp Vladimir Kostenko, vkostenko@asc.rssi.ru Willem Baan, baan@astron.nl Sergey Parfenov, grey1105@yandex.ru Sergei Kalenskii , kalensky@asc.rssi.ru

This work is not part of a thesis.

Remote Observing Request

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

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

Begin ­ End Interval­Interval ­ ­ ­ ­

Days Needed at This Interval

Time Constraints (Must Be Justified in the Prop osal Text) Due to RadiAstron-Arecibo mutual visibility constraints, only the time slots listed below are acceptable: 1. 2015 July 08; time (UT): 5:30 - 7:30 (W48; G34.26+0.15; W49N) 2. 2015 July 16; time (UT): 7:00 - 8:00 (Onsala 1)

Section I I I - Instruments Needed
L-wide Atmospheric Observation Instruments:

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Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned
1644 - 1676

Section V - Observing List Target List
1. 2. 3. 4. G34.26+0.15; RA=18:53:18.685 DEC=01:14:59.9; 18:14:09 - 19:34:00 LST range W48; RA=19:01:45.54 DEC=01:13:32.6; 18:22:45 - 19:42:18 LST range W49N; RA=19:10:13.18 DEC=09:06:12.2; 17:59:12 - 20:22:42 LST range Onsala 1; RA=20:10:09.05 DEC=31:31:35.2; 19:06:07 - 21:15:25 LST range

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