Wide-field study of the peculiar globular cluster system hosted by the field lenticular NGC 1172

Ennis, Ana Inés; Caso, Juan Pablo; Bassino, L. P.; Salinas, R.; Gómez, M.

doi:10.1093/mnras/staa2967

Cited by 8 publications

(7 citation statements)

References 77 publications

(113 reference statements)

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“…Looking at the (𝑔 − 𝑖) distribution of candidates, we find that 85 per cent of the low proper motion candidates fall in the range 0.6 < (𝑔 − 𝑖) < 1.6 mag, which is in agreement with the typical colours of extragalactic GCs in this photometric system (e.g. Faifer et al 2011;Caso et al 2019;Ennis et al 2020) under the assumption of foreground reddening 𝐸 (𝑔−𝑖) ∼ 0.13 mag (Schlafly & Finkbeiner 2011). Moreover, there is a tail of candidates presenting (𝑔 − 𝑖) > 1.6 mag, they are mainly fainter than 𝑟 = 19 mag and ∼ 2/3 of them have higher proper motion values.…”

Section: Colourssupporting

confidence: 80%

J-PLUS: A catalogue of globular cluster candidates around the M81/M82/NGC3077 triplet of galaxies

Chies-Santos¹,

Caso²,

Ennis³

et al. 2022

Preprint

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Globular clusters (GCs) are proxies of the formation assemblies of their host galaxies. However, few studies exist targeting GC systems of spiral galaxies up to several effective radii. Through 12-band Javalambre Photometric Local Universe Survey (J-PLUS) imaging, we study the point sources around the M 81/M 82/NGC 3077 triplet in search of new GC candidates. We develop a tailored classification scheme to search for GC candidates based on their similarity to known GCs via a principal components analysis (PCA) projection. Our method accounts for missing data and photometric errors. We report 642 new GC candidates in a region of 3.5 deg 2 around the triplet, ranked according to their Gaia astrometric proper motions when available. We find tantalising evidence for an overdensity of GC candidate sources forming a bridge connecting M 81 and M 82. Finally, the spatial distribution of the GC candidates (𝑔 − 𝑖) colours is consistent with halo/intra-cluster GCs, i.e. it gets bluer as they get further from the closest galaxy in the field. We further employ a regression-tree based model to estimate the metallicity distribution of the GC candidates based on their J-PLUS bands. The metallicity distribution of the sample candidates is broad and displays a bump towards the metal-rich end. Our list increases the population of GC candidates around the triplet by 3-fold, stresses the usefulness of multi-band surveys in finding these objects, and provides a testbed for further studies analysing their spatial distribution around nearby (spirals) galaxies.

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Section: Colourssupporting

confidence: 80%

J-PLUS: A catalogue of globular cluster candidates around the M81/M82/NGC3077 triplet of galaxies

Chies-Santos¹,

Caso²,

Ennis³

et al. 2022

Preprint

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“…Lenticular and early-type galaxies have bimodal GC populations: one blue and metal-poor, and the other red and metal-rich, whose colors correlate with the host galaxy luminosity and color (Peng et al 2006). This has been studied in galaxies such as the lenticular galaxy NGC 1172 (Ennis et al 2020) and the early-type NGC 6876 (Ennis et al 2019). These GC populations have distinct spatial distributions, with redder, metal-rich GC's more centrally concentrated than their metal-poor counterparts.…”

Section: Introductionmentioning

confidence: 99%

“…These GC populations have distinct spatial distributions, with redder, metal-rich GC's more centrally concentrated than their metal-poor counterparts. The distinct subpopulations, along with with high specific frequencies (the number of GCs normalized to a galaxy with M V = −15) are believed to result from earlier merger events (Ennis et al 2020(Ennis et al , 2019.…”

Section: Introductionmentioning

confidence: 99%

The Ancient Globular Clusters of NGC 1291

Hixenbaugh¹,

Chandar²,

Mok³

2022

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We present a new catalog of 81 ancient globular clusters (GCs) in the early-type spiral (SB0/a) galaxy NGC 1291. Candidates have been selected from B, V, and I band images taken with the Hubble Space Telescope, which also reveal 17 younger (τ ≲ few × 100 Myr) clusters. The luminosity function shows a peaked shape similar to that found for GC systems in other spiral and elliptical galaxies. The ancient clusters have a bimodal color distribution, with approximately 65% (35%) of the population having blue (red) colors. The red, presumably metal-rich, GCs are more centrally concentrated, as expected for a bulge population; while the blue, presumably metal-poor, GCs are more broadly distributed, consistent with expectations of a halo population. The specific frequency of GCs in NGC 1291 is higher than found previously in most spiral galaxies. However, if we consider just the blue subpopulation, we find S N,blue = 0.50 ± 0.06, quite similar to that found for other spirals. This result supports the hypothesis of a universal population of halo GCs in spirals. The fraction of red GCs in NGC 1291, when compared with those found in other galaxies, suggests that these correlate with host galaxy type rather than with host galaxy luminosity.

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“…Lenticular and early type galaxies have bimodal GC populations: one blue and metal-poor, and the other red and metal-rich, whose colors correlate with the host galaxy luminosity and color (Peng et al 2006). This has been studied in galaxies such as the lenticular galaxy NGC 1172 (Ennis et al 2020) and the early-type NGC 6876 (Ennis et al 2019). These GC populations have distinct spatial distributions, with redder, metal rich GC's more centrally concentrated than their metalpoor counterparts.…”

Section: Introductionmentioning

confidence: 99%

“…These GC populations have distinct spatial distributions, with redder, metal rich GC's more centrally concentrated than their metalpoor counterparts. The distinct subpopulations, along with with high specific frequencies (the number of GCs normalized to a galaxy with M V = −15), are believed to result from earlier merger events (Ennis et al 2020(Ennis et al , 2019.…”

Section: Introductionmentioning

confidence: 99%

The Ancient Globular Clusters of NGC 1291

Hixenbaugh,

Chandar,

Mok

2022

Preprint

View full text Add to dashboard Cite

We present a new catalog of 81 ancient globular clusters (GCs) in the early-type spiral (SB0/a) galaxy NGC 1291. Candidates have been selected from B,V , and I band images taken with the Hubble Space Telescope, which also reveal 17 younger (τ < ∼ few × 100 Myr) clusters. The luminosity function shows a peaked shape similar to that found for GC systems in other spiral and elliptical galaxies. The ancient clusters have a bimodal color distribution, with approximately 65% (35%) of the population having blue (red) colors. The red, presumably metal-rich GCs are more centrally concentrated, as expected for a bulge population; while the blue, presumably metal-poor GCs, are more broadly distributed, consistent with expectations of a halo population. The specific frequency of GCs in NGC 1291 is higher than found previously in most spiral galaxies. However, if we consider just the blue subpopulation, we find S N,blue = 0.50 ± 0.06, quite similar to that found for other spirals. This result supports the hypothesis of a universal population of halo GCs in spirals. The fraction of red GCs in NGC 1291, when compared with those found in other galaxies, suggests that these correlate with host galaxy type rather than with host galaxy luminosity.

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Wide-field study of the peculiar globular cluster system hosted by the field lenticular NGC 1172

Cited by 8 publications

References 77 publications

J-PLUS: A catalogue of globular cluster candidates around the M81/M82/NGC3077 triplet of galaxies

J-PLUS: A catalogue of globular cluster candidates around the M81/M82/NGC3077 triplet of galaxies

The Ancient Globular Clusters of NGC 1291

The Ancient Globular Clusters of NGC 1291

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