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Outlying Hα blobs in SDSS IV MaNGA

Published online by Cambridge University Press:  30 October 2019

Omkar Bait ,
Yogesh Wadadekar  and
Sudhanshu Barway
Omkar Bait
Affiliation:
National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Post Bag 3, Ganeshkhind, Pune 411007, India email: omkar@ncra.tifr.res.in
Yogesh Wadadekar
Affiliation:
National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Post Bag 3, Ganeshkhind, Pune 411007, India email: yogesh@ncra.tifr.res.in
Sudhanshu Barway
Affiliation:
Indian Institute of Astrophysics (IIA), II Block, Koramangala, Bengaluru 560 034, India email: sudhanshu.barway@iiap.res.in
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Abstract

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We have discovered a population of 29 outlying Hα emitters which appear like unresolved blobs in the DR14 data release of the SDSS IV MaNGA integral field unit survey. They do not have any underlying optical continuum emission in deep imaging from the DECam Legacy Survey or Beijing-Arizona Sky Survey. These blobs either lie away from the disc of the host galaxy in the MaNGA IFU and/or have velocities which are different from the velocity map of the host galaxy. Interestingly, all of them show photoionisation due to star formation. These galaxies have very high specific star formation rates compared to the known population of dwarf galaxies. However, their metallicities are consistent with or even lowerthan those of the local volume dwarfs. Thus, we can possibly rule out tidal dwarf galaxies. They could represent a new population of low mass and starbursting dwarf galaxies.

Keywords

galaxies: evolutiongalaxies: statisticsgalaxies: structuregalaxies: dwarf
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 265 - 266
Copyright
© International Astronomical Union 2019 

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