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Proposal Identification No.:

A2468

Date Received: 2009 -Feb-01 13:01:12

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: Regular Astronomy Spectroscopy Extragalactic 100 Hours 2.25 hrs

Water in the distant Universe: An Arecibo survey for gravitationally lensed water

masers
ABSTRACT:
Powerful extragalactic water masers are found in regions of dense gas within a few to a few tens of parsec from the central engine of AGN, providing valuable information on the properties of the supermassive black hole and its environment. To date, water masers have mainly been found in the local Universe only, due to the limited sensitivity of current radio telescopes. However, we have recently found the most distant water maser system known, at z = 2.64, in the gravitationally lensed quasar MG 0414+0534. This detection implies that powerful water masers are more abundant in the distant Universe than previously thought. Here we request observations with Arecibo to survey a sample of 25 distant gravitationally lensed quasars to i) confirm that water maser systems are more abundant at high redshift and ii) find further maser systems to study the properties of distant AGN.

Name John P. McKean

Institution Astron

E-mail mckean@astron.nl

Phone +31 521 595 100

Student no

Remote Observing Request

X

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

Instrument Setup
C X-high C-high

Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none 1


RFI Considerations Frequency Ranges Planned
5097 8704 8809 5356 5801 8763 9876 6033 5958 6905 8721 8119 6410 4582 9070 8602 8408 5200 6213 4763 8773 8065 5154 9702 8200 5197 8804 8909 5456 5901 8863 9976 6133 6058 7005 8821 8219 6510 4682 9170 8702 8508 5300 6313 4863 8873 8165 5254 9802 8300

2