The Megamaser Cosmology Project: A Target of Opportunity in Mrk 1419


The H 2 O maser in Mrk 1419 may become one of the cornerstone sources for the Megamaser Cosmology Project (MCP). It has a similar spectrum to NGC 4258 and is located well into the Hubble Flow, so a maser distance directly yields an estimate of H 0 . We have just detected a 200 mJy flare in this source, which would allow us to self-calibrate on the maser using the GBT and VLBA antennas. Self-calibration is highly preferable to external phase-referencing. As discussed in this ToO request, one observing track now could produce data with the sensitivity of nearly 10 tracks, once the flare fades. Therefore, we request a 10 hour ToO observation of Mrk 1419 with the VLBA and GBT.

Name Other * Institution Email Phone
Jim Braatz PI NRAO - CV work: 434-296-0251 home: 434 973-4453
Lincoln Greenhill CfA 617 495-7194
Mark Reid Center for Astrophysics 617 495-7470
Jim Condon NRAO-CV (434) 296-0322
Chris Henkel Max-Planck-Institut fur Radioa 49-228-525-305
Fred Lo NRAO-CV 434-296-0221
* PI = Principal Investigator; CO = Contact author; T = Thesis observations; S = Student

Front Ends
Gregorian K(18.0 to 26.5 GHz)

Back Ends
Mark 5 recorder (disks)

Type of Observing
Very Long Baseline Interferometry

Switching Type

Processor (correlator)

Allotted time 12.00 hours

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Updated 09/19/2007