Hostname: page-component-77c89778f8-m8s7h Total loading time: 0 Render date: 2024-07-24T06:35:18.043Z Has data issue: false hasContentIssue false

Outlying Hα blobs in SDSS IV MaNGA

Published online by Cambridge University Press:  30 October 2019

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
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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.

Type
Contributed Papers
Copyright
© International Astronomical Union 2019 

References

Shim, H., & Chary, R.-R. 2013, ApJ, 765, 26 CrossRefGoogle Scholar
Shim, H., Chary, R.-R., Dickinson, M., et al. 2011, ApJ, 738, 69 CrossRefGoogle Scholar
Cardamone, C., Schawinski, K., Sarzi, M., et al. 2009, MNRAS, 399, 1191 CrossRefGoogle Scholar
Yang, H., Malhotra, S., Rhoads, J. E., & Wang, J. 2017, ApJ, 847, 38 CrossRefGoogle Scholar
Izotov, Y. I., Schaerer, D., Thuan, T. X., et al. 2016, MNRAS, 461, 3683 CrossRefGoogle Scholar
Bait., et al. 2018, submittedGoogle Scholar