H i observations of the nearest starburst galaxy NGC 253 with the SKA precursor KAT-7

Lucero, D. M.; Carignan, C.; Elson, Ed; Randriamampandry, T. H.; Jarrett, T. H.; Oosterloo, Tom; Heald, G.

doi:10.1093/mnras/stv856

Cited by 53 publications

(65 citation statements)

References 94 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The shape of the radio halo in our MWA radio images (Figure 2) resembles the "horn-like" or "X-shaped" structure seen at gigahertz radio frequencies , in H I (Boomsma et al 2005;Lucero et al 2015), X-rays (Fabbiano 1988;Pietsch et al 2000;Bauer et al 2008), Hα (G. Meurer, private communication; Figure 2), UV (Hoopes et al 2005), and far-IR (Kaneda et al 2009). …”

Section: Halo Morphologysupporting

confidence: 59%

“…The diffuse X-ray emission indicates ionized hot gas. As pointed out by Lucero et al (2015), the neutral cold H I gas seems to surround the Xray-emitting regions. The spatial variations of the radio spectral index seem to follow the distribution of the X-ray emission, with the steepening of α occurring in the regions of intense soft X-ray emission (radio spur and NW halo) and the flattening around the voids of diffuse X-ray plasma (western SE halo, eastern NW halo).…”

Section: Maps Of the Radio Spectral Index Distributionmentioning

confidence: 88%

“…, and the star formation rate is ∼5 M e yr −1 (Lenc & Tingay 2006;Rampadarath et al 2014;Bendo et al 2015;Lucero et al 2015). It has been suggested that up to half of the radio sources in the central starburst region are dominated by thermal emission, i.e., H II regions characterized by a flat radio spectral index 24 α;0.1 and including at least one large supercluster of stars (Ulvestad & Antonucci 1997;Keto et al 1999).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spectral Energy Distribution and Radio Halo of NGC 253 at Low Radio Frequencies

Kapińska

Staveley‐Smith

Crocker

et al. 2017

ApJ

View full text Add to dashboard Cite

We present new radio continuum observations of NGC253 from the Murchison Widefield Array at frequencies between 76 and 227 MHz. We model the broadband radio spectral energy distribution for the total flux density of NGC253 between 76 MHz and 11 GHz. The spectrum is best described as a sum of a central starburst and extended emission. The central component, corresponding to the inner 500 pc of the starburst region of the galaxy, is best modeled as an internally free-free absorbed synchrotron plasma, with a turnover frequency around 230 MHz. The extended emission component of the spectrum of NGC253 is best described as a synchrotron emission flattening at low radio frequencies. We find that 34% of the extended emission (outside the central starburst region) at 1 GHz becomes partially absorbed at low radio frequencies. Most of this flattening occurs in the western region of the southeast halo, and may be indicative of synchrotron self-absorption of shock-reaccelerated electrons or an intrinsic low-energy cutoff of the electron distribution. Furthermore, we detect the large-scale synchrotron radio halo of NGC253 in our radio images. At 154-231 MHz the halo displays the well known X-shaped/horn-like structure, and extends out to ∼8 kpc in the z-direction (from the major axis).

show abstract

Section: Halo Morphologysupporting

confidence: 59%

Section: Maps Of the Radio Spectral Index Distributionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spectral Energy Distribution and Radio Halo of NGC 253 at Low Radio Frequencies

Kapińska

Staveley‐Smith

Crocker

et al. 2017

ApJ

View full text Add to dashboard Cite

show abstract

“…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

Self Cite

118

151

View full text Add to dashboard Cite

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.

show abstract

“…There are two other input values to be declared in ROTCUR: free angle and weighting. Following the recommendation by Lucero et al (2015), we adopt a UNIFORM weighting and an exclusion angle of 0°to use for all of the data with the same weighting.…”

mentioning

confidence: 99%

Gas Dynamics of a Luminous z = 6.13 Quasar ULAS J1319+0950 Revealed by ALMA High-resolution Observations

Shao

Wang

Jones

et al. 2017

ApJ

View full text Add to dashboard Cite

We present new Atacama Large Millimeter/submillimeter Array (ALMA) observations of the dust continuum and [C II] 158 μm fine structure line emission toward a far-infrared-luminous quasar, ULAS J131911.29+095051.4 at z=6.13, and combine the new Cycle 1 data with ALMA Cycle 0 data. The combined data have an angular resolution of ∼0 3, and resolve both the dust continuum and the [C II] line emission on a few kiloparsec scales. The [C II] line emission is more irregular than that of the dust continuum emission, which suggests different distributions between the dust and the [C II]-emitting gas. The combined data confirm the [C II] velocity gradient that we had previously detected in a lower-resolution ALMA image from the Cycle 0 data alone. We apply a tilted ring model to the [C II] velocity map to obtain a rotation curve, and constrain the circular velocity to be 427±55 km s −1 at a radius of 3.2 kpc with an inclination angle of 34°. We measure the dynamical mass within the 3.2 kpc region to be 13.4 5.3 7.8 -+ M 10 . This yields a black-hole and host galaxy mass ratio of 0.020 0.007 0.013 -+ , which is about 4 2 3 -+ times higher than that of the present-day M BH /M bulge ratio. This suggests that the supermassive black hole grows the bulk of its mass before the formation of most of the stellar mass in this quasar host galaxy in the early universe.

show abstract

H i observations of the nearest starburst galaxy NGC 253 with the SKA precursor KAT-7

Cited by 53 publications

References 94 publications

Spectral Energy Distribution and Radio Halo of NGC 253 at Low Radio Frequencies

Spectral Energy Distribution and Radio Halo of NGC 253 at Low Radio Frequencies

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

Gas Dynamics of a Luminous z = 6.13 Quasar ULAS J1319+0950 Revealed by ALMA High-resolution Observations

Contact Info

Product

Resources

About