Deconstructing the Antlia cluster core

Caso, Juan Pablo; Richtler, T.

doi:10.1051/0004-6361/201527136

Cited by 5 publications

(2 citation statements)

References 56 publications

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“…Otherwise, a passage that close to NGC 3268 would have left a more disturbed structure of both NGC 3268 and NGC 3269. That contradicts the argument of Caso & Richtler (2015), who put NGC 3269 far in the background. They interpret the radial velocity difference of 1000 km s −1 between NGC 3268 and NGC 3269 as a difference of the recession velocities rather than of the Doppler velocities.…”

Section: Discussionmentioning

confidence: 79%

ALMA detection of the dusty object silhouetted against the S0 galaxy NGC 3269 in the Antlia cluster

Haikala

Salinas

Richtler

et al. 2021

A&A

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Context. An intriguing silhouette of a small dust patch can be seen against the disk of the S0 galaxy NGC 3269 in the Antlia cluster in optical images. The images do not provide any clue as to whether the patch is a local Jupiter mass-scale cloudlet or a large extragalactic dust complex. Aims. We aim to resolve the nature of this object: is it a small Galactic cloudlet or an extragalactic dust complex? Methods. ALMA and APEX spectroscopy and Gemini GMOS long-slit spectroscopy were used to measure the velocity of the patch and the NGC 3269 disk radial velocity curve. Results. A weak 16±2.5 km s −1 wide 12 CO (2-1) T MB 19±2.5. mK line in a 2. 2 by 2. 12 beam associated with the object was detected with ALMA. The observed heliocentric velocity, V r,hel = 3878 ± 5.0km s −1 , immediately establishes the extragalactic nature of the object. The patch velocity is consistent with the velocity of the nucleus of NGC 3269, but not with the radial velocity of the NGC 3269 disk of the galaxy at its position. The ∼4 angular size of the patch corresponds to a linear size of ∼1 kpc at the galaxy's Hubble distance of 50.7 Mpc. The mass estimated from the 12 CO (2-1) emission is ∼1.4×10 6 (d/50.7 Mpc) 2 M , while the attenuation derived from the optical spectrum implies a dust mass of ∼2.6×10 4 (d/50.7 Mpc) 2 M. The derived attenuation ratio A B /(A B − A R) of 1.6±0.11 is substantially lower than the corresponding value for the mean Milky Way extinction curve for point sources (2.3). Conclusions. We established the extragalactic nature of the patch, but its origin remains elusive. One possibility is that the dust patch is left over from the removal of interstellar matter in NGC 3269 through the interaction with its neighbour, NGC 3268.

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Section: Discussionmentioning

confidence: 79%

ALMA detection of the dusty object silhouetted against the S0 galaxy NGC 3269 in the Antlia cluster

Haikala

Salinas

Richtler

et al. 2021

A&A

Self Cite

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“…The central part seems to consist of two groups, each one dominated by one of these giant ellipticals (gEs) with similar luminosity. These two subgroups might be in a merging process, but surface brightness fluctuations distances [4][5][6] and radial velocities analysis [7,8] are not conclusive.…”

Section: Introductionmentioning

confidence: 92%

Revisiting the Globular Cluster Systems of NGC 3258 and NGC 3268

Caso

Bassino

2017

Galaxies

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Abstract:We present a photometric study of NGC 3258 and NGC 3268 globular cluster systems (GCSs) with a wider spatial coverage than previous works. This allowed us to determine the extension of both GCSs, and obtain new values for their populations. In both galaxies, we found the presence of radial colour gradients in the peak of the blue globular clusters. The characteristics of both GCSs point to a large evolutionary history with a substantial accretion of satellite galaxies.

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Early-type galaxies in the Antlia cluster: global properties

Calderón

Bassino

Cellone

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We present an extension of our previous research on the early-type galaxy population of the Antlia cluster (d ∼ 35 Mpc), achieving a total coverage of ∼ 2.6 deg2 and performing surface photometry for ∼ 300 galaxies, 130 of which are new uncatalogued ones. Such new galaxies mainly fall in the low surface brightness (LSB) regime, but there are also some lenticulars (S0) which support the existence of unique functions that connect bright and dwarf galaxies in the scaling relations. We analyse the projected spatial distribution of galaxies up to a distance of ∼ 800 kpc from NGC 3268, the adopted centre, as well as the radial velocity distribution and the correlation between galaxy colour and effective radius with the projected spatial distribution. We also obtain the luminosity function of the early-type galaxies and the distribution of stellar masses using the T1-band magnitudes and adopted mass-luminosity ratios. Additionally, we correlate the central galaxy distribution with an X-ray emission map from the literature. Based on the analysis of the radial velocities and galaxy colour distributions, we find that galaxies redder than the colour-magnitude relation (CMR) have a velocity distribution strongly concentrated towards the values of the dominant galaxies and are homogeneously distributed throughout the cluster. Those bluer than the CMR, in turn, have a much more extended radial velocity distribution and are concentrated towards the centre of the cluster. We also identify 12 candidates to ultra diffuse galaxies (UDG), that seem to be split into two families, and speculate about their origins in the context of the cluster structure.

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Deconstructing the Antlia cluster core

Cited by 5 publications

References 56 publications

ALMA detection of the dusty object silhouetted against the S0 galaxy NGC 3269 in the Antlia cluster

ALMA detection of the dusty object silhouetted against the S0 galaxy NGC 3269 in the Antlia cluster

Revisiting the Globular Cluster Systems of NGC 3258 and NGC 3268

Early-type galaxies in the Antlia cluster: global properties

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