The Cosmic Skidmark: witnessing galaxy transformation at z = 0.19

We present an early-look analysis of the “Cosmic Skidmark”. Discovered following visual inspection of the Geach, Murphy & Bower (2011) SDSS Stripe 82 cluster catalogue generated by ORCA (an automated cluster algorithm searching for red-sequences; Murphy, Geach & Bower 2012), this z = 0.19 1....

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Bibliographic Details
Published in:Proceedings of the International Astronomical Union 2014-07, Vol.10 (S309), p.230-231
Main Author: Murphy, David N. A.
Format: Article
Language:English
Subjects:
Algorithms
Astronomy
Catalogues
Clusters
Contributed Papers
Morphology
Searching
Signatures
Spectroscopy
Spectrum analysis
Star formation
Stars & galaxies
Transformations
Visual inspection
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Summary:We present an early-look analysis of the “Cosmic Skidmark”. Discovered following visual inspection of the Geach, Murphy & Bower (2011) SDSS Stripe 82 cluster catalogue generated by ORCA (an automated cluster algorithm searching for red-sequences; Murphy, Geach & Bower 2012), this z = 0.19 1.4L⋆ galaxy appears to have been caught in the rare act of transformation while accreting onto an estimated 1013–1014h−1 M⊙-mass galaxy group. SDSS spectroscopy reveals clear signatures of star formation whilst deep optical imaging reveals a pronounced 50 kpc cometary tail. Pending completion of our ALMA Cycle 2 and IFU observations, we show here preliminary analysis of this target.
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921314009752