The Clouds are breaking: tracing the Magellanic system with Gaia DR1 Mira variables

Deason, Alis J.; Belokurov, V.; Erkal, Denis; Koposov, S. E.; Mackey, A. D.

doi:10.1093/mnras/stx263

Cited by 53 publications

(55 citation statements)

References 55 publications

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“…Photometric follow-up of the regions surrounding the halo RRab's and LPVs could reveal the presence of faint dwarf galaxies since they were found to trace the Sagittarius dSph's tidal stream in DR14. Since our analysis these sources have been used to examine the extent of Magellanic Clouds using LPV candidates selected from GDR1 data (Deason et al 2016). These objects show the presence of Mira candidates up to >12 • from the LMC.…”

Section: Prospects For Halo Structure Studiesmentioning

confidence: 99%

The Catalina Surveys Southern periodic variable star catalogue

Drake

Djorgovski

Catelan

et al. 2017

Monthly Notices of the Royal Astronomical Society

167

133

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Here, we present the results from our analysis of 6 yr of optical photometry taken by the Siding Spring Survey (SSS). This completes a search for periodic variable stars within the 30 000 deg 2 of the sky covered by the Catalina Surveys. The current analysis covers 81 million sources with declinations between −20 • and −75 • with median magnitudes in the range 11 < V < 19.5. We find approximately 34 000 new periodic variable stars in addition to the ∼9000 RR Lyrae that we previously discovered in SSS data. This brings the total number of periodic variables identified in Catalina data to ∼110 000. The new SSS periodic variable stars mainly consist of eclipsing binaries, RR Lyrae, LPVs, RS CVn stars, δ Scutis, and Anomalous Cepheids. By cross-matching these variable stars with those from prior surveys, we find that ∼90 per cent of the sources are new discoveries and recover ∼95 per cent of the known periodic variables in the survey region. For the known sources, we find excellent agreement between our catalogue and prior values of luminosity, period, and amplitude. However, we find many variable stars that had previously been misclassified. Examining the distribution of RR Lyrae, we find a population associated with the Large Magellanic Cloud (LMC) that extends more than 20 • from its centre confirming recent evidence for the existence of a very extended stellar halo in the LMC. By combining SSS photometry with Dark Energy Survey data, we identify additional LMC halo RR Lyrae, thus confirming the significance of the population.

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Section: Prospects For Halo Structure Studiesmentioning

confidence: 99%

The Catalina Surveys Southern periodic variable star catalogue

Drake

Djorgovski

Catelan

et al. 2017

Monthly Notices of the Royal Astronomical Society

167

133

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“…These latter results are based on deep images obtained with the Dark Energy Camera (DECam) at the CTIO 4 m Blanco telescope (see Valdes et al 2014), and the discovery of some few faint extended stellar objects led to speculate on the possible existence of larger amounts of star clusters. Furthermore, streams of gas and stars that might harbour stellar clusters have also been detected (Mackey et al 2016;Belokurov et al 2017;Deason et al 2017), but a complete search for new clusters in the DECam fields is still pending. Conversely, our findings agrees well with other recent results obtained by Piatti (2017b), who also concluded on low chances of detecting a significant number of stellar clusters there from DECam deep images.…”

Section: The Star Cluster Samplementioning

confidence: 99%

Star cluster formation history along the minor axis of the Large Magellanic Cloud

Piatti¹,

Cole²,

Emptage³

2017

Monthly Notices of the Royal Astronomical Society

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We analysed Washington CM T 1 photometry of star clusters located along the minor axis of the LMC, from the LMC optical centre up to ∼ 39 degrees outwards to the North-West. The data base was exploited in order to search for new star cluster candidates, to produce cluster CMDs cleaned from field star contamination and to derive age estimates for a statistically complete cluster sample. We confirmed that 146 star cluster candidates are genuine physical systems, and concluded that an overall ∼ 30 per cent of catalogued clusters in the surveyed regions are unlikely to be true physical systems. We did not find any new cluster candidates in the outskirts of the LMC (deprojected distance > ∼ 8 degrees). The derived ages of the studied clusters are in the range 7.2 < log(t yr −1 ) ≤ 9.4, with the sole exception of the globular cluster NGC 1786 (log(t yr −1 ) = 10.10). We also calculated the cluster frequency for each region, from which we confirmed previously proposed outside-in formation scenarios. In addition, we found that the outer LMC fields show a sudden episode of cluster formation (log(t yr −1 ) ∼ 7.8-7.9) that continued until log(t yr −1 ) ∼ 7.3 only in the outermost LMC region. We link these features to the first pericentre passage of the LMC to the MW, which could have triggered cluster formation due to ram pressure interaction between the LMC and MW halo.

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“…As stellar clusters are considered, some recent outcomes have shown that there are still a substantial number of extreme low luminosity stellar clusters undetected in the wider MS periphery and the MW halo (Kim et al 2015;Pieres et al 2016;Martin et al 2016). Furthermore, streams of gas and stars that might harbor stellar clusters have also been detected Belokurov et al 2016;Deason et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Stellar Cluster Candidates Discovered in the Magellanic System

Piatti

2017

ApJL

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We address the presently exciting issue of the presence of stellar clusters in the periphery of the Magellanic Clouds (MCs) and beyond by making use of a wealth of wide-field high-quality images released in advance from the Magellanic Stellar Hystory (SMASH) survey. We conducted a sound search for new stellar cluster candidates from suitable kernel density estimators running for appropriate ranges of radii and stellar densities. In addition, we used a functional relationship to account for the completeness of the SMASH field sample analyzed that takes into account not only the number of fields used but also their particular spatial distribution; the present sample statistically represents ∼ 50% of the whole SMASH survey. The relative small number of new stellar cluster candidates identified, most of them distributed in the outer regions of the Magellanic Clouds, might suggest that the lack of detection of a larger number of new cluster candidates beyond the main bodies of the Magellanic Clouds could likely be the outcome once the survey be completed.

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The Clouds are breaking: tracing the Magellanic system with Gaia DR1 Mira variables

Cited by 53 publications

References 55 publications

The Catalina Surveys Southern periodic variable star catalogue

The Catalina Surveys Southern periodic variable star catalogue

Star cluster formation history along the minor axis of the Large Magellanic Cloud

Stellar Cluster Candidates Discovered in the Magellanic System

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