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Proposal Identification No.: A2615 Date Received: 2011­Feb­04 14:59:29
Technical Page
Proposal Type: Long­term
General Category: Astronomy
Sub­Category: Spectroscopy
Observation Category: Extragalactic
Total Time Requested: 42 Hours
Minimum Useful Time:
Proposal Title: Investigating the origin of the high­redshift water maser in MGJ0414+0534.
ABSTRACT:
The water maser line from the gravitationally lensed quasar MGJ0414+0534 was monitored with Arecibo between
October 2008 and January 2010 at ” 6 weeks intervals with the aim of shedding light on the origin of the maser
emission. The great sensitivity of the Arecibo telescope allowed us to resolve the main line profile into a number of
broad features, one of these showing an increase in the line of sight velocity that, if confirmed, might indicate a
positive velocity drift. In addition, a new maser components was tentatively detected in October 2008, displaced by
+800 km/s from the main line. While providing useful clues to determine the nature of the maser in
MGJ0414+0534, our single­dish data alone are presently insu#cient to confidently exclude either one of the two
scenarios, jet vs. accretion disk. Therefore, here we propose to prolong the observations for two additional years,
with higher sensitivity, in order to i) monitor the long­term behaviour of the individual velocity components in the
main line; ii) confirm the presence of the redshifted line that is clearly seen in one epoch and is believed to be
variable; and iii) be able to detect any possible serendipitous flare­up that can be followed­up with VLBI.
Name Institution E­mail Phone Student
Paola Castangia INAF­Osservatorio
Astronomico di
Cagliari
pcastang@oa­cagliari.inaf.it +3907071180255 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:
1

Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
6060­6160
2