Neutral hydrogen and magnetic fields in M83 observed with the SKA Pathfinder KAT-7

Heald, G.; Blok, W. J. G. de; Lucero, D. M.; Carignan, C.; Jarrett, T. H.; Elson, Edward C.; Oozeer, Nadeem; Randriamampandry, T. H.; Zee, Liese van

doi:10.1093/mnras/stw1698

Cited by 38 publications

(64 citation statements)

References 55 publications

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“…where ρ 0,DM is the central dark matter density and a DM is the scale radius. A range of inclination angles, i, and position angles, P A, have been suggested for M83, with evidence that the former increases and the latter decreases with R (e.g., Huchtmeier & Bohnenstengel 1981;Heald et al 2016). We choose i = 24…”

Section: Discussionmentioning

confidence: 99%

“…With these assumptions, the HI rotation curve has a maximum velocity of v c,max ∼ 255 km s −1 between R ∼ 10 − 20 kpc (Park et al 2001;Heald et al 2016).…”

Section: Discussionmentioning

confidence: 99%

“…M83 has an extended HI disk that is detected to R > 50 kpc, with warped and filamentary structure suggestive of interactions with a companion (Miller et al 2009, Heald et al 2016). In the inner disk, Miller et al Chandra X-ray Observatory observations reveal diffuse, soft X-ray emission that traces the nucleus and spiral arms of M83 (Soria & Wu 2002Long et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Detection of Extraplanar Diffuse Ionized Gas in M83*

Boettcher

Gallagher

Zweibel

2017

ApJ

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We present the first kinematic study of extraplanar diffuse ionized gas (eDIG) in the nearby, face-on disk galaxy M83 using optical emission-line spectroscopy from the Robert Stobie Spectrograph on the Southern African Large Telescope. We use a Markov Chain Monte Carlo method to decompose the [NII]λλ6548, 6583, Hα, and [SII]λλ6717, 6731 emission lines into HII region and diffuse ionized gas emission. Extraplanar, diffuse gas is distinguished by its emission-line ratios ([NII]λ6583/Hα ∼ > 1.0) and its rotational velocity lag with respect to the disk (∆v = −24 km s −1 in projection). With interesting implications for isotropy, the velocity dispersion of the diffuse gas, σ = 96 km s −1 , is a factor of a few higher in M83 than in the Milky Way and nearby, edge-on disk galaxies. The turbulent pressure gradient is sufficient to support the eDIG layer in dynamical equilibrium at an electron scale height of h z = 1 kpc. However, this dynamical equilibrium model must be finely tuned to reproduce the rotational velocity lag. There is evidence of local bulk flows near star-forming regions in the disk, suggesting that the dynamical state of the gas may be intermediate between a dynamical equilibrium and a galactic fountain flow. As one of the first efforts to study eDIG kinematics in a face-on galaxy, this study demonstrates the feasibility of characterizing the radial distribution, bulk velocities, and vertical velocity dispersions in low-inclination systems.

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Section: Discussionmentioning

confidence: 99%

“…With these assumptions, the HI rotation curve has a maximum velocity of v c,max ∼ 255 km s −1 between R ∼ 10 − 20 kpc (Park et al 2001;Heald et al 2016).…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Detection of Extraplanar Diffuse Ionized Gas in M83*

Boettcher

Gallagher

Zweibel

2017

ApJ

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“…At the extreme SF locus, the ultra-luminous NGC6240 is an example of a hybrid starburst+AGN merging system. Most nearby spiral galaxies fall into the center of the ensemble, including the large nuclear starburst NGC253 and the barred grand-design spiral M83 (see Jarrett et al 2013;Lucero et al 2015, andHeald et al 2016). Relatively quiescent disk galaxies, such as M81, and elliptical galaxies (e.g., NGC 4486; M87) have large stellar hosts and diminishing SF activity-they fall to the right corner of the diagram.…”

Section: Past-to-present Star Formation Historymentioning

confidence: 99%

Galaxy and Mass Assembly (GAMA): Exploring the WISE Web in G12

Jarrett

Cluver

Magoulas

et al. 2017

ApJ

118

151

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We present an analysis of the mid-infrared Wide-field Infrared Survey Explorer (WISE) sources seen within the equatorial GAMA G12 field, located in the North Galactic Cap. Our motivation is to study and characterize the behavior of WISE source populations in anticipation of the deep multiwavelength surveys that will define the next decade, with the principal science goal of mapping the 3D large-scale structures and determining the global physical attributes of the host galaxies. In combination with cosmological redshifts, we identify galaxies from their WISE W1 (3.4 μm) resolved emission, and we also perform a star-galaxy separation using apparent magnitude, colors, and statistical modeling of star counts. The resulting galaxy catalog has ;590,000 sources in 60 deg 2 , reaching a W1 5σ depth of 31 μJy. At the faint end, where redshifts are not available, we employ a luminosity function analysis to show that approximately 27% of all WISE extragalactic sources to a limit of 17.5 mag (31 μJy) are at high redshift, > z 1. The spatial distribution is investigated using two-point correlation functions and a 3D source density characterization at 5 Mpc and 20 Mpc scales. For angular distributions, we find that brighter and more massive sources are strongly clustered relative to fainter sources with lower mass; likewise, based on WISE colors, spheroidal galaxies have the strongest clustering, while late-type disk galaxies have the lowest clustering amplitudes. In three dimensions, we find a number of distinct groupings, often bridged by filaments and superstructures. Using special visualization tools, we map these structures, exploring how clustering may play a role with stellar mass and galaxy type.

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“…These companions are show in greater detail in the upper right and upper left panels, respectively. c 2016 RAS, MNRAS 000, 1-19 Figure 4: KAT-7 3-pointing mosaic of the extended H I distribution of M83 [25]. Contours show H I column densities and start at 5.6 × 10 18 cm −2 increasing by powers of 1.778.…”

Section: Sample Definition and Observing Timementioning

confidence: 99%

An Overview of the MHONGOOSE Survey: Observing Nearby Galaxies with MeerKAT

Blok¹,

Adams²,

Amram³

et al. 2018

Proceedings of MeerKAT Science: On the Pathway to the SKA — PoS(MeerKAT2016)

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The MHONGOOSE (MeerKAT H i Observations of Nearby Galactic Objects: Observing Southern Emitters) survey maps the distribution and kinematics of the neutral atomic hydrogen (H i) gas in and around 30 nearby star-forming spiral and dwarf galaxies to extremely low H i column densities. The H i column density sensitivity (3σ over 16 km s −1 ) ranges from ∼ 5 • 10 17 cm −2 at 90 ′′ resolution to ∼ 4 • 10 19 cm −2 at the highest resolution of 7 ′′ . The H i mass sensitivity (3σ over 50 km s −1 ) is ∼ 5.5 • 10 5 M ⊙ at a distance of 10 Mpc (the median distance of the sample galaxies). The velocity resolution of the data is 1.4 km s −1 . One of the main science goals of the survey is the detection of cold, accreting gas in the outskirts of the sample galaxies. The sample was selected to cover a range in H i masses, from 10 7 M ⊙ to almost 10 11 M ⊙ , to optimally sample possible accretion scenarios and environments. The distance to the sample galaxies ranges from 3 to 23 Mpc. In this paper, we present the sample selection, survey design, and observation and reduction procedures. We compare the integrated H i fluxes based on the MeerKAT data with those derived from single-dish measurement and find good agreement, indicating that our MeerKAT observations are recovering all flux. We present H i moment maps of the entire sample based on the first ten percent of the survey data, and find that a comparison of the zeroth-and second-moment values shows a clear separation between the physical properties of the H i in areas with star formation and areas without, related to the formation of a cold neutral medium. Finally, we give an overview of the H i-detected companion and satellite galaxies in the 30 fields, five of which have not previously been catalogued. We find a clear relation between the number of companion galaxies and the mass of the main target galaxy.

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Neutral hydrogen and magnetic fields in M83 observed with the SKA Pathfinder KAT-7

Cited by 38 publications

References 55 publications

Detection of Extraplanar Diffuse Ionized Gas in M83*

Detection of Extraplanar Diffuse Ionized Gas in M83*

Galaxy and Mass Assembly (GAMA): Exploring the WISE Web in G12

An Overview of the MHONGOOSE Survey: Observing Nearby Galaxies with MeerKAT

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