GMRT observations of OHM candidates from the ALFALFA survey
arxiv(2024)
Abstract
We present the results of our observations using the Giant Meterwave Radio
Telescope (GMRT) to investigate the radio continuum and OH line emission of 10
OHM candidates from the Arecibo Legacy Fast ALFA (ALFALFA) survey. Among these
candidates, we have identified two sources, AGC115713 and AGC249507, which
display compact OH line emission that are spatially associated with radio
continuum emission. These characteristics align with the typical properties of
OHM galaxies. Furthermore, the infrared (IR) properties of these two galaxies
are consistent with those of known OHM galaxies.
sources have been independently confirmed by alternative methods.
Of the two sources, AGC 249507 has been confirmed through optical redshift,
whereas AGC 115713 meets a WISE color selection criterion in the literature,
providing additional support for this source being an OHM galaxy rather than a
nearby galaxy.
On the contrary, no significant spectral line emission were detected in the
remaining eight OHM candidates using our full GMRT dataset. This suggests that
the spectral line emission initially detected by the ALFALFA survey may have
been significantly resolved in our high-resolution observations. Additionally,
the absence of radio continuum emission in 6 candidates also distinguishes them
from known OHM galaxies documented in the literature. These findings support
the notion that OHM emission may be distributed on a subarcsecond scale,
underscoring the utility of arcsecond-scale observations in confirming OHM
candidates, particularly those lacking optical redshift data.
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