Dark matter and no dark matter: on the halo mass of NGC 1052

Forbes, Duncan A.; Alabi, Adebusola B.; Brodie, Jean P.; Romanowsky, Aaron J.

doi:10.1093/mnras/stz2420

Cited by 14 publications

(14 citation statements)

References 39 publications

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“…If this was not the case, NGC 1052-DF2 would have already experienced the tidal forces of the massive galaxy or even been disrupted. This is in agreement with Forbes et al (2019). The idea that the absence of tidal features indicates an initial infall of the UDG also holds if we use the dynamical mass derived in the previous section (Sec.…”

Section: The Tidal Radius Of Ngc 1052-df2 and Its Distancesupporting

confidence: 89%

“…4.3 and therefore we can infer that the distance between both galaxies has to be larger than ∼ 168 kpc. The virial radius of NGC 1052 is 390 kpc (Forbes et al 2019), and consequently, we cannot fully reject the scenario where NGC 1052-DF2 and NGC 1052 are associated only on the basis of the absence of tidal features. However, the lack of tidal distortion is indicative that if they are associated, NGC 1052-DF2 is in its initial infall into the group.…”

Section: The Tidal Radius Of Ngc 1052-df2 and Its Distancementioning

confidence: 75%

“…Even though the projected physical distance of NGC 1052-DF2 to both galaxies would be equivalent to 80 kpc, the total mass of NGC 1052 (M 1052,dyn (< 40 kpc) = 4.14 ± 0.71 × 10 11 M , Forbes et al 2019) is more than 10 times larger than that of NGC 1042 (M 1042,dyn (< 8 kpc)= 3.0 +3.0 −1.5 × 10 10 M , Trujillo et al in prep.). In order to estimate the dynamical mass of NGC 1042 to the same radial distance than NGC 1052 (i.e., 40 kpc), we can assume that the rotational velocity of NGC 1042 is constant.…”

Section: Tidal Radius Of Ngc 1052-df2mentioning

confidence: 96%

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

Montes

Trujillo

Infante-Sáinz

et al. 2021

ApJ

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Using ultra-deep imaging (µ g = 30.4 mag/arcsec 2 ; 3σ, 10 ×10 ), we probed the surroundings of the first galaxy "lacking" dark matter KKS2000[04] (NGC 1052-DF2). Signs of tidal stripping in this galaxy would explain its claimed low content of dark matter. However, we find no evidence of tidal tails. In fact, the galaxy remains undisturbed down to a radial distance of 80 arcsec. This radial distance triples previous spatial explorations of the stellar distribution of this galaxy. In addition, the distribution of its globular clusters (GCs) is not extended in relation to the bulk of the galaxy (the radius containing half of the GCs is 21 arcsec). We also found that the surface brightness radial profiles of this galaxy in the g and r bands decline exponentially from 35 to 80 arcsec. That, together with a constant ellipticity and position angle in the outer parts of the galaxy strongly suggests the presence of a low-inclination disk. This is consistent with the evidence of rotation found for this object. This finding implies that the dynamical mass of this galaxy is a factor of 2 higher than previously reported, bringing the dark matter content of this galaxy in line with galaxies of similar stellar mass.

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Section: The Tidal Radius Of Ngc 1052-df2 and Its Distancesupporting

confidence: 89%

Section: The Tidal Radius Of Ngc 1052-df2 and Its Distancementioning

confidence: 75%

Section: Tidal Radius Of Ngc 1052-df2mentioning

confidence: 96%

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

Montes

Trujillo

Infante-Sáinz

et al. 2021

ApJ

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“…In order to explore a region wide enough to cover the environment around NGC 1052 we selected an analysis area of 6×6 degrees, corresponding to 2.07×2.07 Mpc at the distance of NGC 1052, which is of 20 Mpc (Tully et al 2013). We thus explore an environment of at least 1 Mpc around NGC 1052 at its distance (the virial radius of NGC 1052 has been calculated to 390 kpc by Forbes et al 2019). In coordinates this region comprises 37.37º < R.A. < 43.27º and -11.26º < Dec. < -5.26º.…”

Section: Datamentioning

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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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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“…As shown in the bottom panels of Figure 5, the relative distance between NGC 1052-DF2 and NGC 1052-DF4 is significantly larger than the virial diameter of NGC 1052, which means that at least one of the galaxies is not bound to the group. The virial diameter is 780 ± 54 kpc (Forbes et al 2019), calculated from the NGC 1052 halo mass assuming an NFW profile with concentration parameter c = 7.0 and the error comes from their reported velocity dispersion uncertainty. NGC 1052-DF2 is perhaps the most likely candidate for being unbound, given its large radial velocity compared to other galaxies in the group (van Dokkum et al 2018b), and the fact that its distance is only just consistent with that of NGC 1052.…”

Section: Discussionmentioning

confidence: 99%

A Tip of the Red Giant Branch Distance of $22.1 \pm 1.2$ Mpc to the Dark Matter Deficient Galaxy NGC1052-DF2 from 40 Orbits of Hubble Space Telescope Imaging

Shen,

Danieli,

van Dokkum

et al. 2021

Preprint

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The large and diffuse galaxies NGC 1052-DF2 and NGC 1052-DF4 have been found to have very low dark matter content and a population of luminous globular clusters. Accurate distance measurements are key to interpreting these observations. Recently, the distance to NGC 1052-DF4 was found to be 20.0 ± 1.6 Mpc by identifying the tip of the red giant branch (TRGB) in 12 orbits of Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) imaging. Here we present 40 orbits of HST ACS data for NGC 1052-DF2 and use these data to measure its TRGB. The TRGB is readily apparent in the color-magnitude diagram. Using a forward model that incorporates photometric uncertainties, we find a TRGB magnitude of m F814W,TRGB = 27.67 ± 0.10 mag. The inferred distance is D TRGB = 22.1 ± 1.2 Mpc, consistent with the previous surface brightness fluctuation distances to the bright elliptical galaxy NGC 1052 . The new HST distance rules out the idea that some of NGC 1052-DF2's unusual properties can be explained if it were at ∼ 13 Mpc; instead, it implies that the galaxy's globular clusters are even more luminous than had been derived using the previous distance of 20 Mpc. The distance from NGC 1052-DF2 to NGC 1052-DF4 is well-determined at 2.1 ± 0.5 Mpc, significantly larger than the virial diameter of NGC 1052. We discuss the implications for formation scenarios of the galaxies and for the external field effect, which has been invoked to explain the intrinsic dynamics of these objects in the context of modified Newtonian dynamics.

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Dark matter and no dark matter: on the halo mass of NGC 1052

Cited by 14 publications

References 39 publications

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

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

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

A Tip of the Red Giant Branch Distance of $22.1 \pm 1.2$ Mpc to the Dark Matter Deficient Galaxy NGC1052-DF2 from 40 Orbits of Hubble Space Telescope Imaging

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