A Disk and No Signatures of Tidal Distortion in the Galaxy “Lacking” Dark Matter NGC 1052-DF2

Montes, Mireia; Trujillo, Ignacio; Infante-Sáinz, Raúl; Monelli, M.; Borlaff, Alejandro

doi:10.3847/1538-4357/ac0d55

Cited by 26 publications

(32 citation statements)

References 65 publications

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“…We note here thatMontes et al (2021) interpret the elongation on the outskirts of NGC 1052-DF2 as a disk.…”

mentioning

confidence: 61%

“…Taking into account that their metallicity content follows the usual stellar mass-metallicity relation for dwarf galaxies (Fensch et al 2019;Ruiz-Lara et al 2019), the possibility that they are tidal dwarf galaxies -galaxies formed by strong interactions with recycled material from massive host galaxies, high in metals, and intrinsically born with a lack of dark matter (see e.g., Duc 2012;Román et al 2021) -is ruled out. The properties of these LSBGs have been the subject of much debate (see e.g., Martin et al 2018;Ogiya 2018;Famaey et al 2018;Kroupa et al 2018;Lewis et al 2020;Haslbauer et al 2019;Müller et al 2019;Nusser 2019;Montes et al 2020Montes et al , 2021. One hypothesis put forward by Trujillo et al (2019) is that these LSBGs "lacking dark matter" could be at a closer distance than initially estimated by van Dokkum et al (2018avan Dokkum et al ( , 2019a.…”

Section: Introductionmentioning

confidence: 99%

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Discovery and analysis of low-surface-brightness galaxies in the environment of NGC 1052

Román

Castilla

Pascual-Granado

2021

A&A

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The environment of NGC 1052 has recently attracted much attention because of the presence of low-surface-brightness galaxies (LSBGs) with apparently "exotic" properties, making it a region of high interest for the detection of new objects. We used public deep photometric data from the Dark Energy Camera Legacy Survey to carry out a comprehensive search for LSBGs over a wide region of 6×6 degrees, equivalent to 2×2 Mpc at the distance of NGC 1052. We detected 42 LSBGs with r e f f > 5 arcsec and µ g (0) > 24 mag arcsec −2 , of which 20 are previously undetected objects. Among all the newly detected objects, RCP 32 stands out with extreme properties: r e f f = 23.0 arcsec and <µ g > e f f = 28.6 mag arcsec −2 . This makes RCP 32 one of the lowest surface brightness galaxies ever detected through integrated photometry, located at just 10 arcmin from the extensively studied NGC 1052-DF2. We explored the presence of globular clusters (GCs) in the LSBGs. We marginally detected a GC system in RCP 32, and argue that this LSBG is of great interest for follow-up observations given its extremely low baryon density. After analyzing the distribution of galaxies with available spectroscopy, we identified a large-scale structure of approximately 1 Mpc that is well isolated in redshift space and centered on NGC 1052. The spatial correlation analysis between the LSBGs and this large-scale structure suggests their association. However, when exploring the distribution of effective radius, we find an overpopulation of large LSBGs (r e f f > 15 arcsec) located close to the line of sight of NGC 1052. We argue that this is suggestive of a substructure with similar radial velocity in sight projection, but at a closer distance, to which some of these apparently larger LSBGs could be associated. However. possible effects derived from tidal interactions are worthy of further study. Our work expands the catalog of LSBGs with new interesting objects and provides a detailed environmental context for the study of LSBGs in this region.

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“…We note here thatMontes et al (2021) interpret the elongation on the outskirts of NGC 1052-DF2 as a disk.…”

mentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Discovery and analysis of low-surface-brightness galaxies in the environment of NGC 1052

Román

Castilla

Pascual-Granado

2021

A&A

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“…Amorisco et al (2018) found that, even in UDGs with abundant GC systems, 𝑅 GC /𝑅 e < 2 with high probability, with several systems better described by 𝑅 GC /𝑅 e 1. More recent estimates of 𝑅 GC for DF44 7 (Saifollahi et al 2021), for MATLAS-2019 (Müller et al 2021) and for NGC1052-DF2 (Montes et al 2021) find 𝑅 GC ≤ 𝑅 e . Again, due to statistical uncertainties, we opt first to work with the composite sample.…”

Section: Gc Distributionmentioning

confidence: 94%

Implications for Galaxy Formation Models from Observations of Globular Clusters around Ultra-Diffuse Galaxies

Saifollahi,

Zaritsky,

Trujillo

et al. 2022

Preprint

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We present an analysis of Hubble Space Telescope observations of globular clusters (GCs) in six ultra-diffuse galaxies (UDGs) in the Coma cluster, a sample that represents UDGs with large effective radii (𝑅 e ), and use the results to evaluate competing formation models. We eliminate two significant sources of systematic uncertainty in the determination of the number of GCs, 𝑁 GC by using sufficiently deep observations that (i) reach the turnover of the GC luminosity function and (ii) provide a sufficient number of GCs with which to measure the GC number radial distribution. We find that 𝑁 GC for these galaxies is on average ∼ 20, which implies an average total mass, 𝑀 total , ∼ 10 11 𝑀 when applying the relation between 𝑁 GC and 𝑀 total . This value of 𝑁 GC lies at the upper end of the range observed for dwarf galaxies of the same stellar mass and is roughly a factor of two larger than the mean. The GC luminosity function, radial profile and average colour are more consistent with those observed for dwarf galaxies than with those observed for the more massive (𝐿 * ) galaxies, while both the radial and azimuthal GC distributions closely follow those of the stars in the host galaxy. Finally, we discuss why our observations, specifically the GC number and GC distribution around these six UDGs, pose challenges for several of the currently favoured UDG formation models.

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“…It has recently been suggested that DF2 and DF4 are entirely unrelated, with DF4 being stripped of its dark matter by NGC 1035, which is near it in projection, and DF2 a face-on disk galaxy with a normal dark-matter content 46 , 47 . The association of DF4 with NGC 1035 is not seen in all datasets 21 , and there is no compelling evidence that DF2 is a disk 7 .…”

Section: Methodsmentioning

confidence: 99%

A trail of dark-matter-free galaxies from a bullet-dwarf collision

Dokkum

Shen

Keim

et al. 2022

Nature

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The ultra-diffuse galaxies DF2 and DF4 in the NGC 1052 group share several unusual properties: they both have large sizes1, rich populations of overluminous and large globular clusters2–6, and very low velocity dispersions that indicate little or no dark matter7–10. It has been suggested that these galaxies were formed in the aftermath of high-velocity collisions of gas-rich galaxies11–13, events that resemble the collision that created the bullet cluster14 but on much smaller scales. The gas separates from the dark matter in the collision and subsequent star formation leads to the formation of one or more dark-matter-free galaxies12. Here we show that the present-day line-of-sight distances and radial velocities of DF2 and DF4 are consistent with their joint formation in the aftermath of a single bullet-dwarf collision, around eight billion years ago. Moreover, we find that DF2 and DF4 are part of an apparent linear substructure of seven to eleven large, low-luminosity objects. We propose that these all originated in the same event, forming a trail of dark-matter-free galaxies that is roughly more than two megaparsecs long and angled 7° ± 2° from the line of sight. We also tentatively identify the highly dark-matter-dominated remnants of the two progenitor galaxies that are expected11 at the leading edges of the trail.

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A Disk and No Signatures of Tidal Distortion in the Galaxy “Lacking” Dark Matter NGC 1052-DF2

Cited by 26 publications

References 65 publications

Discovery and analysis of low-surface-brightness galaxies in the environment of NGC 1052

Discovery and analysis of low-surface-brightness galaxies in the environment of NGC 1052

Implications for Galaxy Formation Models from Observations of Globular Clusters around Ultra-Diffuse Galaxies

A trail of dark-matter-free galaxies from a bullet-dwarf collision

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