Isolated ellipticals and their globular cluster systems

Salinas, R.; Alabi, Adebusola B.; Richtler, T.

doi:10.1051/0004-6361/201425574

Cited by 27 publications

(30 citation statements)

References 109 publications

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“…However, even if we consider these three subsamples, the red fraction of GC candidates in NGC 4546 results to be fr = 0.35 ± 0.10. This value is similar to those presented for galaxies with similar total stellar masses by Salinas et al (2015).…”

Section: Luminosity Function and Total Number Of Gcssupporting

confidence: 91%

Field/isolated lenticular galaxies with high SN values: the case of NGC 4546 and its globular cluster system

Escudero

Faifer

Castelli

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We present a photometric study of the field lenticular galaxy NGC 4546 using Gemini/GMOS imaging in g ′ r ′ i ′ z ′ . We perform a 2D image decomposition of the surface brightness distribution of the galaxy using GALFIT, finding that four components adequately describe it. The subtraction of this model from our images and the construction of a colour map allow us to examine in great detail the asymmetric dust structures around the galactic centre. In addition, we perform a detailed analysis of the globular cluster (GC) system of NGC 4546. Using a Gaussian Mixture Model algorithm in the colour-colour plane we detected hints of multiple groups of GC candidates: the classic blue and red subpopulations, a group with intermediate colours that present a concentrated spatial distribution towards the galaxy, and an additional group towards the red end of the colour distribution. We estimate a total GC population for NGC 4546 of 390 ± 60 members and specific frequency S N = 3.3 ± 0.7, which is relatively high compared to the typical value for galaxies of similar masses and environment. We suggest that the unusual GC population substructures were possibly formed during the interaction that led to the formation of the young ultra-compact dwarf (NGC 4546-UCD1) found in this system. Finally, we estimate the distance modulus of NGC 4546 by analyzing its luminosity function, resulting in (m − M ) = 30.75 ± 0.12 mag (14.1 Mpc).

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Section: Luminosity Function and Total Number Of Gcssupporting

confidence: 91%

Field/isolated lenticular galaxies with high SN values: the case of NGC 4546 and its globular cluster system

Escudero

Faifer

Castelli

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…Its GCS is poorly populated in comparison with Es of similar luminosity in groups/clusters (e.g Harris et al 2013;Caso et al 2017), in agreement with other ellipticals in low density environments (e.g. Caso et al 2013a;Salinas et al 2015;. The S N for iEs with similar luminosity than NGC 6411 typically ranges from 1 to 1.5 (Foster et al 2011;Salinas et al 2015), while cluster and group Es span up to larger values of S N (Forbes et al 1998;Peng et al 2008;Harris et al 2013, and references there in).…”

Section: Discussionsupporting

confidence: 70%

The globular cluster system of the isolated elliptical NGC 6411: an old system in an intermediate-age galaxy?†

Caso

Bassino

Richtler

et al. 2018

Monthly Notices of the Royal Astronomical Society

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We present a photometric study of the isolated elliptical NGC 6411 and its globular cluster (GC) system, based on Gemini/GMOS g ′ , r ′ , i ′ photometry. This galaxy has been the host of a SNIa. Spectral studies indicate an intermediate-age and very metalrich stellar population in its inner region. The extent of the globular cluster system is about 65 kpc. Its population contains 700 ± 45 members, implying a rather poor system, as normally found for isolated ellipticals. The colour bimodality and luminosity distribution are typical of old GC systems. An excess of bright GCs with intermediate colours might evidence an intermediate-age merger, but their colours indicate an older event than ages derived from spectroscopic studies of the diffuse light of the galaxy.

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“…Regarding pure E galaxies in very isolated environments, the samples in these studies are usually composed of only a few bright (massive) objects (e.g., Colbert et al 2001;Marcum et al 2004;Reda et al 2004;Denicoló et al 2005;Collobert et al 2006;Hau & Forbes 2006;Smith et al 2010;Lane et al 2013Lane et al , 2015Richtler et al 2015;Salinas et al 2015). In contrast to these works, Smith et al (2004) and Stocke et al (2004) presented relatively large samples of 32 and 65 isolated E galaxies, respectively, but they did not consider the radial velocity separation of companion galaxies to classify an isolated candidate.…”

Section: Introductionmentioning

confidence: 99%

Isolated elliptical galaxies in the local Universe

Lacerna

Hernández-Toledo

Avila-Reese

et al. 2016

A&A

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Context. We have studied a sample of 89 very isolated, elliptical galaxies at z < 0.08 and compared their properties with elliptical galaxies located in a high-density environment such as the Coma supercluster. Aims. Our aim is to probe the role of environment on the morphological transformation and quenching of elliptical galaxies as a function of mass. In addition, we elucidate the nature of a particular set of blue and star-forming isolated ellipticals identified here. Methods. We studied physical properties of ellipticals, such as color, specific star formation rate, galaxy size, and stellar age, as a function of stellar mass and environment based on SDSS data. We analyzed the blue and star-forming isolated ellipticals in more detail, through photometric characterization using GALFIT, and infer their star formation history using STARLIGHT. Results. Among the isolated ellipticals ≈20% are blue, < ∼ 8% are star forming, and ≈10% are recently quenched, while among the Coma ellipticals ≈8% are blue and just < ∼ 1% are star forming or recently quenched. There are four isolated galaxies (≈4.5%) that are blue and star forming at the same time. These galaxies, with masses between 7 × 10 9 and 2 × 10 10 h −2 M , are also the youngest galaxies with light-weighted stellar ages < ∼ 1 Gyr and exhibit bluer colors toward the galaxy center. Around 30-60% of their presentday luminosity, but only <5% of their present-day mass, is due to star formation in the last 1 Gyr. Conclusions. The processes of morphological transformation and quenching seem to be in general independent of environment since most of elliptical galaxies are "red and dead", although the transition to the red sequence should be faster for isolated ellipticals. In some cases, the isolated environment seems to propitiate the rejuvenation of ellipticals by recent (<1 Gyr) cold gas accretion.

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Isolated ellipticals and their globular cluster systems

Cited by 27 publications

References 109 publications

Field/isolated lenticular galaxies with high SN values: the case of NGC 4546 and its globular cluster system

Field/isolated lenticular galaxies with high SN values: the case of NGC 4546 and its globular cluster system

The globular cluster system of the isolated elliptical NGC 6411: an old system in an intermediate-age galaxy?†

Isolated elliptical galaxies in the local Universe

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