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Title: Digging deeper into the Southern skies: A compact Milky Way companion discovered in first-year Dark Energy Survey data

Abstract

Here, the Dark Energy Survey (DES) is a 5000 sq. degree survey in the southern hemisphere, which is rapidly reducing the existing north-south asymmetry in the census of MW satellites and other stellar substructure. We use the first-year DES data down to previously unprobed photometric depths to search for stellar systems in the Galactic halo, therefore complementing the previous analysis of the same data carried out by our group earlier this year. Our search is based on a matched filter algorithm that produces stellar density maps consistent with stellar population models of various ages, metallicities, and distances over the survey area. The most conspicuous density peaks in these maps have been identified automatically and ranked according to their significance and recurrence for different input models. We report the discovery of one additional stellar system besides those previously found by several authors using the same first-year DES data. The object is compact, and consistent with being dominated by an old and metal-poor population. DES J0034-4902 is found at high significance and appears in the DES images as a compact concentration of faint blue point sources at ~ 87 {kpc}.

Authors:
 [1]
  1. Instituto de Fisica, Porto Alegre (Brazil); Lab. Interinstitucional de e-Astronomia - LIneA, Rio de Janeiro (Brazil). et al.
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
DES Collaboration
OSTI Identifier:
1247534
Alternate Identifier(s):
OSTI ID: 1256636
Report Number(s):
arXiv:1508.02381; FERMILAB-PUB-15-455-AE; SLAC-PUB-16552
Journal ID: ISSN 0035-8711; 1388125
Grant/Contract Number:  
AC02-07CH11359; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 458; Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; globular clusters: general; globular clusters: individual (DES 1); galaxies: dwarf; globular clusters; individual (DES 1)

Citation Formats

Luque, E. Digging deeper into the Southern skies: A compact Milky Way companion discovered in first-year Dark Energy Survey data. United States: N. p., 2016. Web. doi:10.1093/mnras/stw302.
Luque, E. Digging deeper into the Southern skies: A compact Milky Way companion discovered in first-year Dark Energy Survey data. United States. doi:10.1093/mnras/stw302.
Luque, E. Tue . "Digging deeper into the Southern skies: A compact Milky Way companion discovered in first-year Dark Energy Survey data". United States. doi:10.1093/mnras/stw302. https://www.osti.gov/servlets/purl/1247534.
@article{osti_1247534,
title = {Digging deeper into the Southern skies: A compact Milky Way companion discovered in first-year Dark Energy Survey data},
author = {Luque, E.},
abstractNote = {Here, the Dark Energy Survey (DES) is a 5000 sq. degree survey in the southern hemisphere, which is rapidly reducing the existing north-south asymmetry in the census of MW satellites and other stellar substructure. We use the first-year DES data down to previously unprobed photometric depths to search for stellar systems in the Galactic halo, therefore complementing the previous analysis of the same data carried out by our group earlier this year. Our search is based on a matched filter algorithm that produces stellar density maps consistent with stellar population models of various ages, metallicities, and distances over the survey area. The most conspicuous density peaks in these maps have been identified automatically and ranked according to their significance and recurrence for different input models. We report the discovery of one additional stellar system besides those previously found by several authors using the same first-year DES data. The object is compact, and consistent with being dominated by an old and metal-poor population. DES J0034-4902 is found at high significance and appears in the DES images as a compact concentration of faint blue point sources at ~ 87 {kpc}.},
doi = {10.1093/mnras/stw302},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 458,
place = {United States},
year = {2016},
month = {2}
}

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Cited by: 12 works
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Works referenced in this record:

The tidal tails of NGC 2298: The tidal tails of NGC 2298
journal, June 2011


A new Milky way halo star Cluster in the Southern Galactic sky
journal, April 2013


Eight new Milky way Companions Discovered in First-Year dark Energy Survey data
journal, June 2015


Big Fish, Little Fish: two new Ultra-Faint Satellites of the Milky way
journal, March 2010


SExtractor: Software for source extraction
journal, June 1996

  • Bertin, E.; Arnouts, S.
  • Astronomy and Astrophysics Supplement Series, Vol. 117, Issue 2
  • DOI: 10.1051/aas:1996164

parsec : stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
journal, October 2012


The Blanco Cosmology Survey: data Acquisition, Processing, Calibration, Quality Diagnostics, and data Release
journal, September 2012


Eight Ultra-Faint Galaxy Candidates Discovered in year two of the dark Energy Survey
journal, November 2015


SEGUE 3: AN OLD, EXTREMELY LOW LUMINOSITY STAR CLUSTER IN THE MILKY WAY's HALO
journal, August 2011


The dark Energy Camera
journal, October 2015


Too Many, too few, or just Right? the Predicted Number and Distribution of Milky way Dwarf Galaxies
journal, October 2014

  • Hargis, Jonathan R.; Willman, Beth; Peter, Annika H. G.
  • The Astrophysical Journal, Vol. 795, Issue 1
  • DOI: 10.1088/2041-8205/795/1/L13

The Sloan Digital Sky Survey View of the Palomar-Green Bright Quasar Survey
journal, September 2005

  • Jester, Sebastian; Schneider, Donald P.; Richards, Gordon T.
  • The Astronomical Journal, Vol. 130, Issue 3
  • DOI: 10.1086/432466

The Milky Way Tomography with SDSS. I. Stellar Number Density Distribution
journal, February 2008

  • Jurić, Mario; Ivezić, Željko; Brooks, Alyson
  • The Astrophysical Journal, Vol. 673, Issue 2
  • DOI: 10.1086/523619

A Hero'S Little Horse: Discovery of a Dissolving star Cluster in Pegasus
journal, January 2015


Horologium ii: a Second Ultra-Faint Milky way Satellite in the Horologium Constellation
journal, July 2015


Discovery of a Faint Outer halo Milky way star Cluster in the Southern sky
journal, April 2015


The structure of star clusters. I. an empirical density law
journal, October 1962


The Discovery of Two Extremely Low Luminosity Milky Way Globular Clusters
journal, November 2007

  • Koposov, S.; de Jong, J. T. A.; Belokurov, V.
  • The Astrophysical Journal, Vol. 669, Issue 1
  • DOI: 10.1086/521422

Beasts of the Southern Wild: Discovery of nine Ultra Faint Satellites in the Vicinity of the Magellanic Clouds
journal, May 2015

  • Koposov, Sergey E.; Belokurov, Vasily; Torrealba, Gabriel
  • The Astrophysical Journal, Vol. 805, Issue 2
  • DOI: 10.1088/0004-637X/805/2/130

On the variation of the initial mass function
journal, April 2001


A new Distant Milky way Globular Cluster in the Pan-Starrs1 3π Survey
journal, April 2014

  • Laevens, Benjamin P. M.; Martin, Nicolas F.; Sesar, Branimir
  • The Astrophysical Journal, Vol. 786, Issue 1
  • DOI: 10.1088/2041-8205/786/1/L3

A NEW FAINT MILKY WAY SATELLITE DISCOVERED IN THE PAN-STARRS1 3 π SURVEY
journal, March 2015

  • Laevens, Benjamin P. M.; Martin, Nicolas F.; Ibata, Rodrigo A.
  • The Astrophysical Journal, Vol. 802, Issue 2
  • DOI: 10.1088/2041-8205/802/2/L18

SAGITTARIUS II, DRACO II AND LAEVENS 3: THREE NEW MILKY WAY SATELLITES DISCOVERED IN THE PAN-STARRS 1 3 π SURVEY
journal, October 2015

  • Laevens, Benjamin P. M.; Martin, Nicolas F.; Bernard, Edouard J.
  • The Astrophysical Journal, Vol. 813, Issue 1
  • DOI: 10.1088/0004-637X/813/1/44

Assessing the Milky way Satellites Associated with the Sagittarius Dwarf Spheroidal Galaxy
journal, July 2010


The horizontal-branch stars in globular clusters. 2: The second parameter phenomenon
journal, March 1994

  • Lee, Young-Wook; Demarque, Pierre; Zinn, Robert
  • The Astrophysical Journal, Vol. 423
  • DOI: 10.1086/173803

The Observed Properties of Dwarf Galaxies in and Around the Local Group
journal, June 2012


The halo+cluster system of the Galactic globular cluster NGC 1851★
journal, June 2014

  • Marino, A. F.; Milone, A. P.; Yong, D.
  • Monthly Notices of the Royal Astronomical Society, Vol. 442, Issue 4
  • DOI: 10.1093/mnras/stu1099

Iron and s-elements abundance variations in NGC 5286: comparison with ‘anomalous' globular clusters and Milky Way satellites
journal, April 2015

  • Marino, A. F.; Milone, A. P.; Karakas, A. I.
  • Monthly Notices of the Royal Astronomical Society, Vol. 450, Issue 1
  • DOI: 10.1093/mnras/stv420

A Comprehensive Maximum Likelihood Analysis of the Structural Properties of Faint Milky Way Satellites
journal, September 2008

  • Martin, Nicolas F.; de Jong, Jelte T. A.; Rix, Hans‐Walter
  • The Astrophysical Journal, Vol. 684, Issue 2
  • DOI: 10.1086/590336

Hydra ii: a Faint and Compact Milky way Dwarf Galaxy Found in the Survey of the Magellanic Stellar History
journal, April 2015

  • Martin, Nicolas F.; Nidever, David L.; Besla, Gurtina
  • The Astrophysical Journal, Vol. 804, Issue 1
  • DOI: 10.1088/2041-8205/804/1/L5

Global and Nonglobal Parameters of Horizontal-Branch Morphology of Globular Clusters
journal, March 2014


The Discovery of an Ultra-Faint star Cluster in the Constellation of ursa Minor
journal, June 2012


The VPOS: a vast polar structure of satellite galaxies, globular clusters and streams around the Milky Way: The VPOS: a vast polar structure around the MW
journal, May 2012


The new Milky Way satellites: alignment with the VPOS and predictions for proper motions and velocity dispersions
journal, August 2015

  • Pawlowski, Marcel S.; McGaugh, Stacy S.; Jerjen, Helmut
  • Monthly Notices of the Royal Astronomical Society, Vol. 453, Issue 1
  • DOI: 10.1093/mnras/stv1588

A Matched-Filter Analysis of the Tidal Tails of the Globular Cluster Palomar 5
journal, July 2002

  • Rockosi, Constance M.; Odenkirchen, Michael; Grebel, Eva K.
  • The Astronomical Journal, Vol. 124, Issue 1
  • DOI: 10.1086/340957

Measuring Reddening with Sloan Digital sky Survey Stellar Spectra and Recalibrating sfd
journal, August 2011


Maps of Dust Infrared Emission for Use in Estimation of Reddening and Cosmic Microwave Background Radiation Foregrounds
journal, June 1998

  • Schlegel, David J.; Finkbeiner, Douglas P.; Davis, Marc
  • The Astrophysical Journal, Vol. 500, Issue 2
  • DOI: 10.1086/305772

The Kinematics of the Ultra‐faint Milky Way Satellites: Solving the Missing Satellite Problem
journal, November 2007

  • Simon, Joshua D.; Geha, Marla
  • The Astrophysical Journal, Vol. 670, Issue 1
  • DOI: 10.1086/521816

An Optical Catalog of Galaxy Clusters Obtained from an Adaptive Matched Filter Finder Applied to Sloan Digital sky Survey data Release 6
journal, June 2011


Hundreds of Milky Way Satellites? Luminosity Bias in the Satellite Luminosity Function
journal, November 2008

  • Tollerud, Erik J.; Bullock, James S.; Strigari, Louis E.
  • The Astrophysical Journal, Vol. 688, Issue 1
  • DOI: 10.1086/592102

The globular cluster system of the galaxy. IV - The halo and disk subsystems
journal, June 1985


    Works referencing / citing this record:

    Constraining self-interacting dark matter with scaling laws of observed halo surface densities
    journal, April 2018

    • Bondarenko, Kyrylo; Boyarsky, Alexey; Bringmann, Torsten
    • Journal of Cosmology and Astroparticle Physics, Vol. 2018, Issue 04
    • DOI: 10.1088/1475-7516/2018/04/049