Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/CastangiatagA2547tp.ps Дата изменения: Mon Feb 15 15:06:37 2010 Дата индексирования: Fri Feb 11 19:46:57 2011 Кодировка: Поисковые слова: jet

Proposal Identification No.: A2547 Date Received: 2010­Feb­01 13:50:26
Technical Page
Proposal Type: Long­term
General Category: Astronomy
Sub­Category: Spectroscopy
Observation Category: Extragalactic
Total Time Requested: 14 Hours
Minimum Useful Time: 3.5­5.25 LST
Proposal Title: The water megamaser in MGJ0414+0534: jet­maser or disk­maser?
ABSTRACT:
The water maser line from the gravitationally lensed quasar MGJ0414+0534 has been monitored with Arecibo
since October 2008 at 6 weeks intervals with the aim of shedding light on the origin of the maser emission.
Although the stability of the main maser line throughout the monitoring and presence of a satellite line suggest
that the maser originates in the accretion disk rather than in the relativistic jet(s) detected in the quasar, the
current data do not allow us to draw a definitive conclusion on its nature. Therefore, we propose to prolong the
monitoring for two additional years, at a slower rate, in order to i) be able to detect any possible serendipitous
flare­up that can be followed­up with VLBI; ii) confirm the presence of the satellite line that is clearly seen in one
epoch and is believed to be variable and iii) investigate the hypothesis of a velocity drift smaller than 8 km/s per
year. The presence of satellite lines and velocity drifts in the maser spectrum is important since it can be used to
estimate the mass of the supermassive black hole and the radius of the accretion disk in a quasar at redshift 2.64.
Name Institution E­mail Phone Student
Paola Castangia INAF­OAC pcastang@ca.astro.it +3907071180258 no
Remote Observing Request
Observer will travel to AO
X Remote Observing
In Absentia (instructions to oper­
ator)
Instrument Setup
C C­high
Atmospheric Observation Instruments:
Special Equipment or setup: none
1

RFI Considerations
Frequency Ranges Planned
6060­6160
2