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Methods for detecting flaring structures in Sagittarius A* with high frequency VLBI
Sheperd S. Doeleman, Vincent L. Fish, Avery E. Broderick +2
The super massive black hole candidate, Sagittarius A*, exhibits variability from radio to X-ray wavelengths on time scales that correspond to < 10 Schwarzschild radii. We survey t…
Estimating the Parameters of Sgr A*'s Accretion Flow Via Millimeter VLBI
Avery E. Broderick, Vincent L. Fish, Sheperd S. Doeleman +1
Recent millimeter-VLBI observations of Sagittarius A* (Sgr A*) have, for the first time, directly probed distances comparable to the horizon scale of a black hole. This provides un…
Detecting Flaring Structures in Sagittarius A* with (Sub)Millimeter VLBI
Vincent L. Fish, Sheperd S. Doeleman, Avery E. Broderick +2
Multiwavelength monitoring observations of Sagittarius A* exhibit variability on timescales of minutes to hours, indicating emission regions localized near the event horizon. (Sub)…
Excited-state OH Masers and Supernova Remnants
Ylva M. Pihlström, Vincent L. Fish, Loránt O. Sjouwerman +3
The collisionally pumped, ground-state 1720 MHz maser line of OH is widely recognized as a tracer for shocked regions and observed in star forming regions and supernova remnants. W…
Effelsberg Observations of Excited-State (6.0 GHz) OH in Supernova Remnants and W3(OH)
Vincent L. Fish, Loránt O. Sjouwerman, Ylva M. Pihlström
While masers in the 1720 MHz transition of OH are detected toward many supernova remnants (SNRs), no other OH transition is seen as a maser in SNRs. We present a search for masers…
EVLA Observations of OH Masers in ON 1
Vincent L. Fish
This Letter reports on initial Expanded Very Large Array (EVLA) observations of the 6035 MHz masers in ON 1. The EVLA data are of good quality, lending confidence in the new receiv…