FOUR NEW STELLAR DEBRIS STREAMS IN THE GALACTIC HALO

By C. Grillmair. 2008

197 citations recorded by the source corpus.

We report on the detection of four new stellar debris streams and a new dwarf galaxy candidate in the Sloan Digital Sky Survey. Three of the streams, ranging between 3 and 15 kpc in distance and spanning between 37° and 84° on the sky, are very narrow and are most probably tidal streams originating in extant or disrupted globular clusters. The fourth stream is much broader, roughly 45 kpc distant, at least 53° in length, and is most likely the tidal debris from a dwarf galaxy. As each of the streams spans multiple constellations, we extend tradition and designate them the Acheron, Cocytos, Lethe, and Styx streams. At the same distance and apparently embedded in the Styx stream is a ∼1 kpc wide concentration of stars with an apparently similar color–magnitude distribution, which we designate Bootes III. Given its very low surface density, its location within the stream, and its apparently disturbed morphology, we argue that Bootes III may be the progenitor of Styx and in possibly the final throes of tidal dissolution. While the current data do not permit strong constraints, preliminary orbit estimates for the streams do not point to any likely progenitors among the known globular clusters and dwarf galaxies.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/cf222236ebdac66a89e054734a4da5483813292e

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

In Instrumentation

Citations in the corpus

THE DUAL ORIGIN OF STELLAR HALOS (2009, background): “Numerous stellar streams believed to have originated from small accreted galaxies have been observed in the Milky Way’s outer halo (e.g., Newberg et al. 2002; Yanny et al. 2003; Belokurov et al. 2006; Grillmair 2009).”
The formation and assembly history of the Milky Way revealed by its globular cluster population (2018, background): “…are revealing the relics of this ongoing accretion process, during which dwarf galaxies are tidally disrupted and their debris builds up the central galaxy’s halo (e.g. Ibata et al. 1994; Martin et al. 2004; Belokurov et al. 2006; McConnachie et al. 2009; Grillmair 2009; Crnojević et al. 2016).”
CONSTRAINING THE MILKY WAY POTENTIAL WITH A SIX-DIMENSIONAL PHASE-SPACE MAP OF THE GD-1 STELLAR STREAM (2009, background): “Recently Grillmair (2009) claimed the discovery of another 4 stellar streams.”
The current status of galaxy formation (2012, background): “Gaps in the tails (Grillmair, 2009) indicate the presence of dark satellites.”
The hidden giant: discovery of an enormous Galactic dwarf satellite in Gaia DR2 (2018, background): “Curiously, this is almost three times larger than the next largest known satellites, Cra 2 and BooIII, both with rh ∼ 0.5 deg (Grillmair 2009; Torrealba et al. 2016a).”
The Apache Point Observatory Galactic Evolution Experiment (APOGEE) (2007, unknown): “…probing the complexities of Galactic structure — e.g., halo substructure (e.g., Majewski et al. 2003; RochaPinto et al. 2004; Belokurov et al. 2006; Grillmair 2009), satellite galaxies (e.g., Willman et al. 2005; Belokurov et al. 2007), the warp of the disk (e.g., López-Corredoira et al. 2002;…”
Sweating the small stuff: simulating dwarf galaxies, ultra-faint dwarf galaxies, and their own tiny satellites (2015, background): “…et al. 2010), the faintest of which were all discovered by the Sloan Digital Sky Survey (SDSS) (Willman et al. 2005a,b; Grillmair 2006; Sakamoto & Hasegawa 2006; Irwin et al. 2007; Walsh, Jerjen & Willman 2007; Grillmair 2009; Zucker et al. 2006a,b; Belokurov et al. 2006, 2007, 2008, 2009, 2010).”
Gaia DR2 proper motions of dwarf galaxies within 420 kpc (2018, background): “…internal motions complicate measurements; Leo T, because there is only a handful of stars with spectroscopic data that have matches in Gaia, and these are very faint, and therefore with large proper motion errors; and Bootes III, due to its unclear nature as a galaxy or stream (Grillmair 2009).”
THE OBSERVED PROPERTIES OF DWARF GALAXIES IN AND AROUND THE LOCAL GROUP (2012, unknown): “13h57m12.s0 +26d48m00s Grillmair (2009) Very diffuse.”
EIGHT ULTRA-FAINT GALAXY CANDIDATES DISCOVERED IN YEAR TWO OF THE DARK ENERGY SURVEY (2015, unknown): “…York et al. 2000) data through a combination of systematic searches (Willman et al. 2005a, 2005b; Belokurov et al. 2006, 2007, 2008, 2009, 2010; Grillmair 2006, 2009; Sakamoto & Hasegawa 2006; Zucker et al. 2006a, 2006b; Irwin et al. 2007; Walsh et al. 2007) and dedicated spectroscopic…”
The VPOS: a vast polar structure of satellite galaxies, globular clusters and streams around the Milky Way (2012, methodology): “A start and an end-position are given in the discovery paper (Grillmair 2009), which are used as anchor points.”
Numerical simulations of the dark universe: State of the art and the next decade (2012, background): “Additionally, cold stellar streams associated with the disruption of globular clusters [71] are promising probes of the clumpiness of the Milky Way’s DM halo, since interactions with passing subhalos should produce kinks and gaps the stream [72, 73].”
Project Overview of the Beijing–Arizona Sky Survey (2017, methodology): “From the SDSS imaging data, people have found numerous stellar halo streams (Newberg et al. 2003; Yanny et al. 2003; Grillmair 2009) and have doubled the number of dwarf galaxies (Willman et al. 2010).”
EIGHT NEW MILKY WAY COMPANIONS DISCOVERED IN FIRST-YEAR DARK ENERGY SURVEY DATA (2015, background): “…revealed 15 additional arcminute-scale, resolved stellar overdensities (Willman et al. 2005a, 2005b; Belokurov et al. 2006, 2007, 2008, 2009, 2010; Grillmair 2006, 2009; Sakamoto & Hasegawa 2006; Zucker et al. 2006a, 2006b; Irwin et al. 2007; Walsh et al. 2007) that have been either…”
CLUMPY STREAMS FROM CLUMPY HALOS: DETECTING MISSING SATELLITES WITH COLD STELLAR STRUCTURES (2010, background): “For example, Figure 3 of Odenkirchen et al. (2003); Grillmair (2009) present maps of the region around Pal 5, in which the star counts have been smoothed with a parabolic and gaussian kernel.”
Galactic Searches for Dark Matter (2012, background): “ted with tidally-disrupted dwarf galaxies. Name Distance [kpc] Reference Magellanic Stream { Mathewson et al. (1974) Sagittarius { Ibata et al. (1994) Orphan Stream { Belokurov et al. (2007a) Styx 45 Grillmair (2009) Bootes III 45 Grillmair (2009); Carlin et al. (2009) In addition to the Sagittarius”
Milky Way Satellite Census. I. The Observational Selection Function for Milky Way Satellites in DES Y3 and Pan-STARRS DR1 (2019, methodology): “Boötes III is a diffuse object (extending ∼ 1.5 deg) with a complex morphology that was identified visually in filtered stellar density maps from SDSS DR5 (Grillmair 2009).”
Accreted versus in situ Milky Way globular clusters (2010, background): “…the accretion and disruption of dwarf galaxies in the form of several stellar streams having been detected (Helmi et al. 1999; Newberg et al. 2002; Duffau et al. 2006; Grillmair 2009), the most famous of which is associated with the Sagittarius dwarf spheriodal galaxy (Ibata, Gilmore & Irwin 1994).”