Browsing by Subject "galaxies"
Now showing items 1-17 of 17
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Broad-band radio polarimetry of disc galaxies and AGN with KAT-7
(Oxford University Press, 2020-10-24)We report broad-band (1.2–1.9 GHz) radio continuum observations at arcminute resolutions of two nearby disc galaxies, NGC 1808 and NGC 1097, and four active galactic nuclei (AGN)-powered radio sources: PKS B1934−638, PKS ... -
A CHANDRA STUDY OF TEMPERATURE SUBSTRUCTURES IN INTERMEDIATE-REDSHIFT GALAXY CLUSTERS
(2009)By analyzing the gas temperature maps created from the Chandra archive data, we reveal the prevailing existence of temperature substructures on ∼ 100 h −1 70 kpc scales in the central regions of nine intermediate-redshift ... -
Effect of the environment on star formation activity and stellar mass for star-forming galaxies in the COSMOS field
(2020-11)We investigate the relationship between the environment and the galaxy main sequence (the relationship between stellar mass and star formation rate), as well as the relationship between the environment and radio luminosity ... -
ELUCID. VIII. simulating the coma galaxy cluster to calibrate model and understand feedback
(Institute of Physics, 2024)We conducted an investigation of the Coma cluster of galaxies by running a series of constrained hydrodynamic simulations with GIZMO-SIMBA and GADGET-3 based on initial conditions reconstructed from the SDSS survey volume ... -
The evolution of the low-frequency radio AGN population to z 1.5 in the ELAIS N1 field
(Advance Access publication, 2020-11-13)We study the cosmic evolution of radio sources out to z 1.5 using a GMRT 610 MHz survey covering ∼1.86 deg2 of the ELAIS N1 field with a minimum/median rms noise 7.1/19.5 μJy beam−1 and an angular resolution of 6 arcsec. ... -
Gas-dynamical mass measurements of the supermassive black holes in the early-type galaxies NGC 4786 and NGC 5193 from ALMA and HST observations
(Institute of Physics, 2024)We present molecular gas-dynamical mass measurements of the central black holes in the giant elliptical galaxies NGC 4786 and NGC 5193, based on CO (2−1) observations from the Atacama Large Millimeter/submillimeter Array ... -
The h i in ring galaxies survey (h i -rings) - effects of the bar on the h i gas in ring galaxies
(Cambridge University Press, 2023)We present a new high-resolution neutral atomic hydrogen (Hi) survey of ring galaxies using the Australia Telescope Compact Array (ATCA). We target a sample of 24 ring galaxies from the Buta (1995) Southern Ring Galaxy ... -
HELP: a catalogue of 170 million objects, selected at 0.36–4.5 μm, from 1270 deg2 of prime extragalactic fields
(Oxford University Press, 2019)We present an optical to near-infrared (NIR) selected astronomical catalogue covering 1270 deg2. This is the first attempt to systematically combine data from 23 of the premier extragalactic survey fields – the product of ... -
Mergers, starbursts, and quenching in the SIMBA simulation
(Oxford Academic, 2019)We use the SIMBAcosmological galaxy formation simulation to investigate the relationship between major mergers (4:1), starbursts, and galaxy quenching. Mergers are identified via sudden jumps in stellar mass M∗ well above ... -
MIGHTEE-H I : the M H I −M * relation over the last billion years
(Oxford University Press, 2023)We study the relation over the last billion years using the MIGHTEE-H i sample. We first model the upper envelope of the relation with a Bayesian technique applied to a total number of 249 H i-selected galaxies, without ... -
MIGHTEE-H I: possible interactions with the galaxy NGC 895
(Oxford University Press, 2023)The transformation and evolution of a galaxy is strongly influenced by interactions with its environment. Neutral hydrogen (H i) is an excellent way to trace these interactions. Here, we present H i observations of the ... -
MIGHTEE-HI: discovery of an HI-rich galaxy group at z = 0.044 with MeerKAT
(Monthly Notices of the Royal Astronomical Society, 2021)We present the serendipitous discovery of a galaxy group in the XMM-LSS field with MIGHTEE Early Science observations. 20 galaxies are detected in HI in this z ∼ 0.044 group, with a 3σ column density sensitivity of NHI = ... -
A new technique to isolate kinematically anomalous gas in H i data cubes
(Oxford University Press, 2023)H i line observations of nearby galaxies often reveal the presence of extraplanar and/or kinematically anomalous gas that deviates from the general circular flow. In this work, we study the dependence of kinematically ... -
Spectral age distribution for radio-loud active galaxies in the xmm-lss field
(Oxford University Press, 2023)Jets of energetic particles, as seen in FR type-I and FR type-II sources, ejected from the centre of radio-loud AGN affect the sources surrounding the intracluster medium/intergalactic medium. Placing constraints on the ... -
VLA imaging of the XMM-LSS/VIDEO deep field at 1–2 GHz
(Oxford University Press, 2020-06-20)Modern radio telescopes are routinely reaching depths where normal star-forming galaxies are the dominant observed population. Realizing the potential of radio as a tracer of star formation and black hole activity over ... -
A wide-angle formulation of foreground filters for HI intensity mapping
(Springer Nature, 2024)The fluctuations generated by Inflation are nearly Gaussian in the simplest models, but may be non-Gaussian in more complex models, potentially leading to signatures in the late Universe. In particular, local-type primordial ... -
The wide-field, multiplexed, spectroscopic facility weave: Survey design, overview, and simulated implementation
(Oxford University Press, 2024)WEAVE, the new wide-field, massively multiplexed spectroscopic survey facility for the William Herschel Telescope, saw first light in late 2022. WEAVE comprises a new 2-deg field-of-view prime-focus corrector system, a ...