GHASP: an H α kinematical survey of spiral galaxies – XIII. Distribution of luminous and dark matter in spiral and irregular nearby galaxies using H α and H i rotation curves and WISE photometry

Korsaga, Marie; Épinat, B.; Amram, P.; Carignan, C.; Adamczyk, P.; Sorgho, A.

doi:10.1093/mnras/stz2678

Cited by 17 publications

(17 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Fig. 6 we plot our 26 c versus V opt along with those obtained from individual RCs in Korsaga et al (2019b). The agreement further reinforces the statement of the gross inability of NFW halos to reproduce the observed disk kinematics.…”

Section: Resultssupporting

confidence: 74%

“…It is important to compare the results of our work with a previous study of individual RCs (Korsaga et al 2019b). It is worth noticing that the coadded RCs with respect to the individual RCs show on average higher values of c and a stronger correlation with the halo mass as likely expected by the coaddition process, which has eliminated a part of the random errors of the individual RCs.…”

Section: Resultsmentioning

confidence: 71%

See 1 more Smart Citation

Navarro-Frenk-White dark matter profile and the dark halos around disk systems

Dehghani

Salucci

Ghaffarnejad

2020

A&A

View full text Add to dashboard Cite

Context. The Λ cold dark matter (ΛCDM) scenario is able to describe the Universe at large scales, but clearly shows some serious difficulties at small scales. The core-cusp question is one of these difficulties: the inner dark matter (DM) density profiles of spiral galaxies generally appear to be cored, without the r−1 profile that is predicted by N-body simulations in the above scenario. Aims. It is well known that in a more physical context, the baryons in the galaxy might backreact and erase the original cusp through supernova explosions. Before the efficiency and the presence of this effect is investigated, it is important to determine how wide and frequent the discrepancy between observed and N-body-predicted profiles is and what its features are. Methods. We used more than 3200 quite extended rotation curves (RCs) of good quality and high resolution of disk systems that included normal and dwarf spirals as well as low surface brightness galaxies. The curves cover all magnitude ranges. All these RCs were condensed into 26 coadded RCs, each of them built with individual RCs of galaxies of similar luminosity and morphology. We performed mass models of these 26 RCs using the Navarro-Frenk-White (NFW) profile for the contribution of the DM halo to the circular velocity and the exponential Freeman disk for the contribution of the stellar disk. Results. The fits are generally poor in all the 26 cases: in several cases, we find χred2 > 2. Moreover, the best-fitting values of three parameters of the model (c, MD, and Mvir) combined with those of their 1σ uncertainty clearly contradict well-known expectations of the ΛCDM scenario. We also tested the scaling relations that exist in spirals with the outcome of the current mass modeling: the modeling does not account for these scaling relations. Conclusions. The results of testing the NFW profile in disk systems indicate that this DM halo density law cannot account for the kinematics of the whole family of disk galaxies. It is therefore mandatory for the success of the ΛCDM scenario in any disk galaxy of any luminosity or maximum rotational velocity to transform initial cusps into the observed cores.

show abstract

Section: Resultssupporting

confidence: 74%

Section: Resultsmentioning

confidence: 71%

Navarro-Frenk-White dark matter profile and the dark halos around disk systems

Dehghani

Salucci

Ghaffarnejad

2020

A&A

View full text Add to dashboard Cite

show abstract

“…In this paper, we provide the community with a homogeneous catalog of DM halo parameters for 175 galaxies from the SPARC database, considering seven different halo models. Homogeneity is an important guarantee for fair comparisons of models, as Korsaga et al (2019) find that different fitting procedures can lead to significantly different fitting results. The halo parameters are derived performing MCMC fits to HI/Hα rotation curves.…”

Section: Resultsmentioning

confidence: 99%

A Comprehensive Catalog of Dark Matter Halo Models for SPARC Galaxies

Lelli

McGaugh

et al. 2020

ApJS

114

134

View full text Add to dashboard Cite

We present rotation curve fits to 175 late-type galaxies from the Spitzer Photometry & Accurate Rotation Curves (SPARC) database using seven dark matter (DM) halo profiles: pseudo-isothermal (pISO), Burkert, Navarro-Frenk-White (NFW), Einasto, Di Cintio et al. (2014, DC14), coreNFW, and a new semi-empirical profile named Lucky13. We marginalize over stellar mass-to-light ratio, galaxy distance, disk inclination, halo concentration and halo mass (and an additional shape parameter for Einasto) using a Markov Chain Monte Carlo method. We find that cored halo models such as the DC14 and Burkert profiles generally provide better fits to rotation curves than the cuspy NFW profile. The stellar mass-halo mass relation from abundance matching is recovered by all halo profiles once imposed as a Bayesian prior, whereas the halo mass-concentration relation is not reproduced in detail by any halo model. We provide an extensive set of figures as well as best-fit parameters in machine-readable tables to facilitate model comparison and the exploration of DM halo properties.

show abstract

“…We normalized the uncertainties in attributing the same total weight to the Hα and to the H i datasets in order to have a similar contribution to the fit from inner and outer regions. Because the weight of uncertainties in a fit is not an absolute but relative quantity, we do not modify the Hα uncertainties but we redistribute the new weights on the H i data only, using the relation given in Korsaga et al (2019). The weight given to a velocity point is the inverse of its uncertainty.…”

Section: Weighting Of the Rotation Curvementioning

confidence: 99%

First spectroscopic study of ionised gas emission lines in the extreme low surface brightness galaxy Malin 1

Junais

Boissier

Épinat

et al. 2020

A&A

View full text Add to dashboard Cite

Context. Malin 1 is the largest known low surface brightness (LSB) galaxy, the archetype of so-called giant LSBs. The structure and the origin of such galaxies are still poorly understood, especially due to the lack of high-resolution kinematics and spectroscopic data. Aims. We use emission lines from spectroscopic observations of Malin 1 aiming to bring new constraints on the internal dynamics and star formation history of Malin 1. Methods. We have extracted a total of 16 spectra from different regions of Malin 1 and calculated the rotational velocities of these regions from the wavelength shifts and star formation rates from the observed Hα emission line fluxes. We compare our data with existing data and models for Malin 1. Results. For the first time we present the inner rotation curve of Malin 1, characterized in the radial range r < 10 kpc by a steep rise in the rotational velocity up to at least ∼350 km s −1 (with a large dispersion), which had not been observed previously. We use these data to study a suite of new mass models for Malin 1. We show that in the inner regions dynamics may be dominated by the stars (although none of our models can explain the highest velocities measured) but that at large radii a massive dark matter halo remains necessary. The Hα fluxes derived star formation rates are consistent with an early-type disk for the inner region, and with the level found in extended UV galaxies for the outer parts of the giant disk of Malin 1. We also find signs of high metallicity but low dust content for the inner regions.

show abstract

GHASP: an H α kinematical survey of spiral galaxies – XIII. Distribution of luminous and dark matter in spiral and irregular nearby galaxies using H α and H i rotation curves and WISE photometry

Cited by 17 publications

References 42 publications

Navarro-Frenk-White dark matter profile and the dark halos around disk systems

Navarro-Frenk-White dark matter profile and the dark halos around disk systems

A Comprehensive Catalog of Dark Matter Halo Models for SPARC Galaxies

First spectroscopic study of ionised gas emission lines in the extreme low surface brightness galaxy Malin 1

Contact Info

Product

Resources

About