An Ultra-Faint Galaxy Candidate Discovered in Early Data From the Magellanic Satellites Survey

Drlica-Wagner, A.; Bechtol, K.; Allam, S.; Tucker, D. L.; Gruendl, R. A.; Johnson, Michael D.; Walker, A. R.; James, D. J.; Nidever, David L.; Olsen, Knut; Wechsler, Risa H.; Cioni, M. R. L.; Conn, Blair C.; Kuêhn, K.; Li, T. S.; Mao, Yao-Yuan; Martín, Nicolás F.; Neilsen, Eric H.; Noël, N. E. D.; Pieres, A.; Simon, Joshua D.; Stringfellow, Guy S.; Marel, Roeland P. van der; Yanny, B.

doi:10.3847/2041-8205/833/1/l5

Cited by 96 publications

(50 citation statements)

References 48 publications

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“…MagLiteS is a National Optical Astronomy Observatories (NOAO) community survey (NOAO proposal 2016A-0366) that is using the DECam to complete an annulus of contiguous imaging around the periphery of the Magellanic System (Drlica-Wagner et al 2016).…”

Section: Datamentioning

confidence: 99%

A stellar overdensity associated with the Small Magellanic Cloud

Pieres

Santiago

Drlica-Wagner

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We report the discovery of a stellar overdensity 8• north of the centre of the Small Magellanic Cloud (SMC; Small Magellanic Cloud Northern Over-Density; SMCNOD), using data from the first 2 yr of the Dark Energy Survey (DES) and the first year of the MAGellanic SatelLITEs Survey (MagLiteS). The SMCNOD is indistinguishable in age, metallicity and distance from the nearby SMC stars, being primarily composed of intermediate-age stars (6 Gyr, Z=0.001), with a small fraction of young stars (1 Gyr, Z=0.01). The SMCNOD has an elongated shape with an ellipticity of 0.6 and a size of ∼ 6• × 2 • . It has an absolute magnitude of M V ∼ = −7.7, r h = 2.1 kpc, and μ V (r < r h ) = 31.2 mag arcsec −2 . We estimate a stellar mass of ∼10 5 M , following a Kroupa mass function. The SMCNOD was probably removed from the SMC disc by tidal stripping, since it is located near the head of the Magellanic Stream, and the literature indicates likely recent Large Magellanic Cloud-SMC encounters. This scenario is supported by the lack of significant H I gas. Other potential scenarios for the SMCNOD origin are a transient overdensity within the SMC tidal radius or a primordial SMC satellite in advanced stage of disruption.

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Section: Datamentioning

confidence: 99%

A stellar overdensity associated with the Small Magellanic Cloud

Pieres

Santiago

Drlica-Wagner

et al. 2017

Monthly Notices of the Royal Astronomical Society

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“…Laevens et al 2015), the Dark Energy Survey (DES; e.g. Bechtol et al 2015;Koposov et al 2015) and the Dark Energy Camera more generally Drlica-Wagner et al 2016). The advent of wide-field imagers on 4-m+ telescopes has allowed the search for faint satellites in resolved stars to extend beyond the Local Group (e.g.…”

Section: Introductionmentioning

confidence: 99%

Discovery of Diffuse Dwarf Galaxy Candidates around M101

Bennet

Sand

Crnojević

et al. 2017

ApJ

106

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We have conducted a search of a 9 deg 2 region of the CFHTLS around the Milky Way analog M101 (D∼7 Mpc), in order to look for previously unknown low surface brightness galaxies. This search has uncovered 38 new low surface brightness dwarf candidates, and confirmed 11 previously reported galaxies, all with central surface brightness µ(g,0)>23mag/arcsec 2 , potentially extending the satellite luminosity function for the M101 group by ∼1.2 magnitudes. The search was conducted using an algorithm that nearly automates the detection of diffuse dwarf galaxies. The candidates small size and low surface brightness means that the faintest of these objects would likely be missed by traditional visual or computer detection techniques. The dwarf galaxy candidates span a range of −7.1 ≥ M g ≥ −10.2 and half light radii of 118-540 pc at the distance of M101, and they are well fit by simple Sérsic surface brightness profiles. These properties are consistent with dwarfs in the Local Group, and to match the Local Group luminosity function ∼10-20 of these candidates should be satellites of M101. Association with a massive host is supported by the lack of detected star formation and the over density of candidates around M101 compared to the field. The spatial distribution of the dwarf candidates is highly asymmetric, and concentrated to the northeast of M101 and therefore distance measurements will be required to determine if these are genuine members of the M101 group.

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“…Over the past two years, more than 20 ultra-faint dwarf galaxy candidates have been discovered in data from the Dark Energy Survey (DES; Bechtol et al 2015;Drlica-Wagner et al 2015b;Kim & Jerjen 2015;Koposov et al 2015) and other large optical surveys (Kim et al 2015a(Kim et al , 2015bLaevens et al 2015bLaevens et al , 2015aMartin et al 2015;Drlica-Wagner et al 2016;Homma et al 2016;Torrealba et al 2016aTorrealba et al , 2016b. One of the largest most luminous and most distant newly discovered satellites is EridanusII (Eri II), which has an absolute magnitude of M V ∼−7, a half-light radius of r h ∼280 pc, and a Galactocentric distance of D∼370 kpc (Bechtol et al 2015;Koposov et al 2015;Crnojević et al 2016; see Table 1).…”

Section: Introductionmentioning

confidence: 99%

Farthest Neighbor: The Distant Milky Way Satellite Eridanus II*

Simon

Drlica-Wagner

et al. 2017

ApJ

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151

153

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We present Magellan/IMACS spectroscopy of the recently discovered Milky Way satellite EridanusII (Eri II).We identify 28 member stars in EriII, from which we measure a systemic radial velocity of () 1 the bright blue stars previously suggested to be a young stellar population are not associated with EriII. The lack of gas and recent star formation in EriII is surprising given its mass and distance from the Milky Way, and may place constraints on models of quenching in dwarf galaxies and on the distribution of hot gas in the Milky Way halo. Furthermore, the large velocity dispersion of Eri II can be combined with the existence of a central star cluster to constrain massive compact halo object dark matter with mass 10  M .

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An Ultra-Faint Galaxy Candidate Discovered in Early Data From the Magellanic Satellites Survey

Cited by 96 publications

References 48 publications

A stellar overdensity associated with the Small Magellanic Cloud

A stellar overdensity associated with the Small Magellanic Cloud

Discovery of Diffuse Dwarf Galaxy Candidates around M101

Farthest Neighbor: The Distant Milky Way Satellite Eridanus II*

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