Stellar Streams Discovered in the Dark Energy Survey
N. Shipp, A. Drlica-Wagner, E. Balbinot, P. Ferguson, D. Erkal, T. S. Li, K. Bechtol, V. Belokurov, B. Buncher, D. Carollo, M. Carrasco Kind, K. Kuehn, J. L. Ma… 展开作者
N. Shipp, A. Drlica-Wagner, E. Balbinot, P. Ferguson, D. Erkal, T. S. Li, K. Bechtol, V. Belokurov, B. Buncher, D. Carollo, M. Carrasco Kind, K. Kuehn, J. L. Marshall, A. B. Pace, E. S. Rykoff, I. Sevilla-Noarbe, E. Sheldon, L. Strigari, A. K. Vivas, B. Yanny, A. Zenteno, T. M. C. Abbott, F. B. Abdalla, S. Allam, S. Avila, E. Bertin, D. Brooks, D. L. Burke, J. Carretero, F. J. Castander, R. Cawthon, M. Crocce, C. E. Cunha, C. B. D'Andrea, L. N. da Costa, C. Davis, J. De Vicente, S. Desai, H. T. Diehl, P. Doel, A. E. Evrard, B. Flaugher, P. Fosalba, J. Frieman, J. García-Bellido, E. Gaztanaga, D. W. Gerdes, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, B. Hoyle, D. J. James, M. D. Johnson, E. Krause, N. Kuropatkin, O. Lahav, H. Lin, M. A. G. Maia, M. March, P. Martini, F. Menanteau, C. J. Miller, R. Miquel, R. C. Nichol, A. A. Plazas, A. K. Romer, M. Sako, E. Sanchez, V. Scarpine, R. Schindler, M. Schubnell, M. Smith, R. C. Smith, F. Sobreira, E. Suchyta, M. E. C. Swanson, G. Tarle, D. Thomas, D. L. Tucker, A. R. Walker, R. H. Wechsler, the DES Collaboration
We perform a search for stellar streams around the Milky Way using the first three years of multi-band optical imaging data from the Dark Energy Survey (DES). We use DES data covering $\sim 5000$ sq. deg. to a depth of $g > 23.5$ with a relative photometric calibration uncertainty of $< 1 \%$. This data set yields unprecedented sensitivity to the stellar density field in the southern celestial hemisphere, enabling the detection of faint stellar streams to a heliocentric distance of $\sim 50$ kpc. We search for stellar streams using a matched-filter in color-magnitude space derived from a synthetic isochrone of an old, metal-poor stellar population. Our detection technique recovers four previously known thin stellar streams: Phoenix, ATLAS, Tucana III, and a possible extension of Molonglo. In addition, we report the discovery of eleven new stellar streams. In general, the new streams detected by DES are fainter, more distant, and lower surface brightness than streams detected by similar techniques in previous photometric surveys. As a by-product of our stellar stream search, we find evidence for extra-tidal stellar structure associated with four globular clusters: NGC 288, NGC 1261, NGC 1851, and NGC 1904. The ever-growing sample of stellar streams will provide insight into the formation of the Galactic stellar halo, the Milky Way gravitational potential, as well as the large- and small-scale distribution of dark matter around the Milky Way.
When Streams Curve Away: a Test of Dark Matter from Extragalactic Stellar Stream Populations
Massachusetts Institute of Technology（麻省理工学院）；Case Western Reserve University（凯斯西储大学）；Princeton University（普林斯顿大学）；Technical University of Denmark（丹麦技术大学）；University of Copenhagen（哥本哈根大学）
Evidence for the First Globular Cluster Stellar Stream beyond the Milky Way
University of Copenhagen（哥本哈根大学）；DTU Space, Technical University of Denmark（丹麦技术大学空间中心）；Princeton University（普林斯顿大学）；University of Arizona（亚利桑那大学）；Flatiron Institute（平顿研究所）；Northwestern University（西北大学）
Tidal streams in newly discovered M32 analogues: evidence for the stripping scenario
我们提出了两个新发现的紧凑的椭圆（cE）星系，表现出明确的证据潮汐蒸汽，并发现在搜索的SDSS DR 7 cE候选人。的结构参数的CE使用GALFIT，给出有效半径，Re，388和263秒差距，和B波段平均表面亮度内Re的19.4和19.2的幅度每弧秒平方。我们重新分析了SDSS光谱，表明它们拥有年轻到中等年龄的恒星星族。这两个cE提供了直接的证据，一个“吸烟枪”，潮汐剥离的过程，被认为是M32型星系的起源。这两个星系都是在一个小的星系群中，有很大的螺旋部分，这表明我们可能会在动态年轻的环境中看到这样的cE星系的形成。更紧凑的星系是在一个与本星系群类似的小星系群中发现的，因此为理解M32提供了一个额外的模型。
Inferring Globular Cluster Initial Mass Function from Stellar Streams
Canadian Institute for Theoretical Astrophysics, University of Toronto（加拿大理论天体物理研究所，多伦多大学）；Department of Astronomy & Astrophysics, University of Toronto（天文学与天体物理学系，多伦多大学）
Potamides: Mapping Dark Matter Halo Shapes from Stellar Stream Tracks in the Local Universe
DARK, Niels Bohr Institute, University of Copenhagen（哥本哈根大学尼尔斯·玻尔研究所）；Department of Physics, Massachusetts Institute of Technology（麻省理工学院物理系）；Department of Astronomy, Case Western Reserve University（凯斯西储大学天文学系）；DTU Space, Technical University of Denmark（丹麦技术大学空间研究所）；Department of Astrophysical Sciences, Princeton University（普林斯顿大学天体物理科学系）；Departamento de Física de la Tierra y Astrofísica, Universidad Complutense de Madrid（马德里康普顿斯大学地球与天体物理学系）；Leiden Observatory, Leiden University（莱顿大学莱顿天文台）；Centro de Estudios de Física del Cosmos de Aragón (CEFCA), Unidad Asociada al CSIC（阿拉贡宇宙物理学研究中心（CEFCAS））；ARAID Foundation（ARAID基金会）
Dancing Streams In Merging Halos: Stellar Streams in a MW--LMC-like merger
Carnegie Science Observatories（卡内基科学观测站）；Northwestern University（西北大学）；Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA)（天体物理交叉探索与研究中心）；NSF-Simons AI Institute for the Sky (SkAI)（NSF-西蒙斯天空人工智能研究所）；Columbia University（哥伦比亚大学）；Boston University（波士顿大学）；Flatiron Institute（平顿研究所）
Formation of Parallel Stellar Streams through Encounters with Dark Matter Subhalos and Intermediate-Mass Black Holes
The University of Tokyo（东京大学）；University of Tsukuba（筑波大学）；Kitami Institute of Technology（北见工业大学）；University Observatory Munich（慕尼黑大学天文台）；Max-Planck-Institut für extraterrestrische Physik（马克斯·普朗克地外物理研究所）
Detectability of dark matter subhalo impacts in Milky Way stellar streams
University of California, San Diego（加利福尼亚大学圣地亚哥分校）；Institute of High Energy Physics, Austrian Academy of Sciences（奥地利科学院高能物理研究所）；The Observatories of the Carnegie Institution for Science（卡内基科学机构天文台）
