We have carried out a systematic search for outlying Hα emitters in the entire data release 14 of the Sloan Digital Sky Survey (SDSS) IV Mapping Nearby Galaxies at APO (MaNGA) survey. We have discovered six outlying Hα emitters with no bright underlying optical continuum emission in the imaging data release 5 from the Dark Energy Camera Legacy Survey (DECaLS) and data release 6 of the Mayall z-band Legacy Survey (MzLS) + Beijing-Arizona Sky Survey (BASS). They also show a velocity field which is different from that of the host galaxy. These outlying Hα emitters all have extended structure in the Hα image. Their emission line ratios show that they are photoionised due to an active galactic nucleus (AGN) or a mixture of both an AGN and star formation. Some of them are very likely to be fainter counterparts of Hanny's Voorwerp like objects.
Cite
@article{arxiv.1902.03754,
title = {Outlying H$\alpha$ emitters in SDSS IV MaNGA},
author = {Omkar Bait and Yogesh Wadadekar and Sudhanshu Barway},
journal= {arXiv preprint arXiv:1902.03754},
year = {2019}
}
Comments
20 pages, 13 figures, 4 tables (including the appendices), Accepted for publication in MNRAS