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An Orphan No Longer? Detection of the Southern Orphan Stream and a Candidate Progenitor

Grillmair, Carl J. and Hetherington, Lauren and Carlberg, Raymond G. and Willman, Beth (2015) An Orphan No Longer? Detection of the Southern Orphan Stream and a Candidate Progenitor. Astrophysical Journal Letters, 812 (2). Art. No. L26. ISSN 2041-8205.

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Using a shallow, two-color survey carried out with the Dark Energy Camera, we detect the southern, possibly trailing arm of the Orphan Stream. The stream is reliably detected to a decl. of −38°, bringing the total known length of the Orphan Stream to 108°. We find a slight offset or "S" shape in the stream at δ ≃ −14° that would be consistent with the transition from leading to trailing arms. This coincides with a moderate concentration of 137 ± 25 stars (to g = 21.6) that we consider a possible remnant of the Orphan progenitor. The position of this feature is in agreement with previous predictions.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Grillmair, Carl J.0000-0003-4072-169X
Willman, Beth0000-0003-2892-9906
Additional Information:© 2015 American Astronomical Society. Received 2015 July 16; accepted 2015 September 23; published 2015 October 15. We gratefully acknowledge Jonathan Hargis for helpful suggestions in the course of developing our photometry pipeline. This project used data obtained with the Dark Energy Camera (DECam), which was constructed by the Dark Energy Survey (DES) collaboration. Funding for the DES Projects has been provided by the DOE and NSF(USA), MISE(Spain), STFC(UK), HEFCE(UK). NCSA(UIUC), KICP(U. Chicago), CCAPP(Ohio State), MIFPA(Texas A&M), CNPQ, FAPERJ, FINEP (Brazil), MINECO(Spain), DFG(Germany), and the collaborating institutions in the Dark Energy Survey, which are Argonne Lab, UC Santa Cruz, University of Cambridge, CIEMAT-Madrid, University of Chicago, University College London, DES-Brazil Consortium, University of Edinburgh, ETH Zurich, Fermilab, University of Illinois, ICE (IEECCSIC), IFAE Barcelona, Lawrence Berkeley Lab, LMU Munchen and the associated Excellence Cluster Universe, University of Michigan, NOAO, University of Nottingham, Ohio State University, University of Pennsylvania, University of Portsmouth, SLAC National Lab, Stanford University, University of Sussex, and Texas A&M University. Facility: CTIO:Blanco (DECam).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Higher Education Funding Council for EnglandUNSPECIFIED
National Center for Supercomputing Applications (NCSA)UNSPECIFIED
Kavli Institute for Cosmological PhysicsUNSPECIFIED
Center of Cosmology and Astro Particle Physics (CCAPP)UNSPECIFIED
George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy (MIFPA)UNSPECIFIED
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNSPECIFIED
Ministerio de Economía y Competitividad (MINECO)UNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)UNSPECIFIED
Financiadora de Estudos e Projetos (FINEP)UNSPECIFIED
Subject Keywords:Galaxy: halo; Galaxy: structure
Issue or Number:2
Record Number:CaltechAUTHORS:20151222-080933013
Persistent URL:
Official Citation:Carl J. Grillmair et al 2015 ApJ 812 L26
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63120
Deposited By: Ruth Sustaita
Deposited On:22 Dec 2015 16:59
Last Modified:03 Oct 2019 09:25

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