Angular momentum of dwarf galaxies

Kurapati, Sushma; Chengalur, Jayaram N.; Pustilnik, S. A.; Kamphuis, P.

doi:10.1093/mnras/sty1397

Cited by 36 publications

(50 citation statements)

References 61 publications

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“…The fat and ROTCUR derived rotation curves (shown in Fig. A1, A2, and A3 of Kurapati et al 2018) are in broad agreement for 8 of the 11 galaxies. The main difference is that the inner parts of the rotation curves derived using fat are steeper than those derived using ROTCUR.…”

Section: Rotation Curvessupporting

confidence: 53%

Mass models of gas-rich void dwarf galaxies

Kurapati

Chengalur

Kamphuis

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We construct mass models of eight gas rich dwarf galaxies that lie in the Lynx-Cancer void. From NFW fits to the dark matter halo profile, we find that the concentration parameters of halos of void dwarf galaxies are similar to those of dwarf galaxies in normal density regions. We also measure the slope of the central dark matter density profiles, obtained by converting the rotation curves derived using 3-D (fat ) and 2-D (ROTCUR) tilted ring fitting routines, into mass densities. We find that the average slope (α = −1.39 ± 0.19), obtained from 3-D fitting is consistent with that expected from an NFW profile. On the other hand, the average slope measured using the 2-D approach is closer to what would be expected for an isothermal profile. This suggests that systematic effects in velocity field analysis have a significant effect on the slope of the central dark matter density profiles. Given the modest number of galaxies we use for our analysis, it is important to check these results using a larger sample.

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Section: Rotation Curvessupporting

confidence: 53%

Mass models of gas-rich void dwarf galaxies

Kurapati

Chengalur

Kamphuis

et al. 2019

Monthly Notices of the Royal Astronomical Society

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“…To do this, it is thus imperative to have a baryonic counterpart of the size-mass and Fall relations (e.g. Obreschkow & Glazebrook 2014;Kurapati et al 2018), for a sample of spirals sufficiently large in mass. We plan to report on the latter soon, establishing first whether the observed baryonic Fall relation is tighter and more fundamental than the stellar Fall relation.…”

Section: Discussionmentioning

confidence: 99%

Galaxy disc scaling relations: A tight linear galaxy–halo connection challenges abundance matching

Posti

Marasco

Fraternali

et al. 2019

A&A

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In ΛCDM cosmology, to first order, galaxies form out of the cooling of baryons within the virial radius of their dark matter halo. The fractions of mass and angular momentum retained in the baryonic and stellar components of disc galaxies put strong constraints on our understanding of galaxy formation. In this work, we derive the fraction of angular momentum retained in the stellar component of spirals, f j , the global star formation efficiency f M , and the ratio of the asymptotic circular velocity (V flat ) to the virial velocity f V , and their scatter, by fitting simultaneously the observed stellar mass-velocity (Tully-Fisher), size-mass, and mass-angular momentum (Fall) relations. We compare the goodness of fit of three models: (i) where the logarithm of f j , f M , and f V vary linearly with the logarithm of the observable V flat ; (ii) where these values vary as a double power law; and (iii) where these values also vary as a double power law but with a prior imposed on f M such that it follows the expectations from widely used abundance matching models. We conclude that the scatter in these fractions is particularly small (∼ 0.07 dex) and that the "linear" model is by far statistically preferred to that with abundance matching priors. This indicates that the fundamental galaxy formation parameters are small-scatter single-slope monotonic functions of mass, instead of being complicated non-monotonic functions. This incidentally confirms that the most massive spiral galaxies should have turned nearly all the baryons associated with their haloes into stars. We call this the failed feedback problem.

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“…WALLABY will resolve the H I discs of ∼5 000 galaxies with five or more beams (corresponding roughly to the catalogued HIPASS detections), enabling us to derive accurate outer rotation curves and thus to calculate the angular momentum for large samples of galaxies from different environments (low to high densities). Such a study will for the first time allow us to understand the origin of the scatter in H I scaling relations from an angular momentum perspective (see Kurapati et al 2018).…”

Section: H I Scaling Relationsmentioning

confidence: 99%

WALLABY – an SKA Pathfinder H i survey

Koribalski

Staveley‐Smith

Westmeier

et al. 2020

Astrophys Space Sci

201

125

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The Widefield ASKAP L-band Legacy All-sky Blind surveY (WALLABY) is a next-generation survey of neutral hydrogen (H I) in the Local Universe. It uses the widefield, high-resolution capability of the Australian Square Kilometer Array Pathfinder (ASKAP), a radio interferometer consisting of 36 × 12-m dishes equipped with Phased-Array Feeds (PAFs), located in an extremely radioquiet zone in Western Australia. WALLABY aims to survey three-quarters of the sky (−90 • < δ < +30 • ) to a redshift of z 0.26, and generate spectral line image cubes at ∼30 arcsec resolution and ∼1.6 mJy beam −1 per 4 km s −1 channel sensitivity. ASKAP's instantaneous field of view at 1.4 GHz, delivered by the PAF's 36 beams, is about 30 sq deg. At an integrated signal-to-noise ratio of five, WALLABY is expected to detect around half a million galaxies with a mean redshift of z ∼ 0.05 (∼200 Mpc). The scientific goals of WALLABY include: (a) a census of gas-rich galaxies in the vicinity of the Local Group; (b) a study of the H I properties of galaxies, groups and clusters, in particular the influence of the environment on galaxy evolution; and (c) the refinement of cosmological parameters using the spatial and redshift distribution of low-bias gas-rich galaxies. For context we provide an overview of recent and planned large-scale H I surveys. Combined with existing and new multi-wavelength sky surveys, WALLABY will enable an exciting new generation of panchromatic studies of the Local Universe. -First results from the WALLABY pilot survey are revealed, with initial data products publicly available in the CSIRO ASKAP Science Data Archive (CASDA).

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Angular momentum of dwarf galaxies

Cited by 36 publications

References 61 publications

Mass models of gas-rich void dwarf galaxies

Mass models of gas-rich void dwarf galaxies

Galaxy disc scaling relations: A tight linear galaxy–halo connection challenges abundance matching

WALLABY – an SKA Pathfinder H i survey

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