R. J. Ivison
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View article: Resolved Schmidt-Kennicutt relation in a binary hyperluminous infrared galaxy at $z=2.41$
Resolved Schmidt-Kennicutt relation in a binary hyperluminous infrared galaxy at $z=2.41$ Open
Hyperluminous infrared galaxies (HyLIRGs; SFRs up to about 1000 Msun yr-1), though rare, provide key constraints on galaxy evolution. H-ATLAS J084933.4+021443, a z = 2.41 binary HyLIRG (galaxies W and T) with two additional luminous compan…
View article: Resolved Schmidt–Kennicutt relation in a binary hyperluminous infrared galaxy at <i>z</i> = 2.41
Resolved Schmidt–Kennicutt relation in a binary hyperluminous infrared galaxy at <i>z</i> = 2.41 Open
Aims. Hyperluminous infrared galaxies (HyLIRGs; star-formation rates of up to ≈1000 M ⊙ yr −1 ) – while rare – provide crucial long-lever-arm constraints on galaxy evolution. H-ATLAS J084933.4+021443, a z = 2.41 binary HyLIRG (galaxies ‘W’…
View article: ALMA Deep Field in SSA22: Reconstructed [CII] Luminosity Function at z = 6
ALMA Deep Field in SSA22: Reconstructed [CII] Luminosity Function at z = 6 Open
The ADF22 line survey reported detections of two high-$z$ line-emitting source candidates above 6-$σ$, both of which were shown to be spurious after follow-up observations. We investigate the detectability of far-infrared emitters in ALMA …
View article: Vz-GAL: Probing Cold Molecular Gas in Dusty Star-forming Galaxies at z=1-6
Vz-GAL: Probing Cold Molecular Gas in Dusty Star-forming Galaxies at z=1-6 Open
We present the first results of Vz-GAL, a high-redshift CO(J=1-0) large survey with the Karl G. Jansky Very Large Array, targeting 92 Herschel-selected, infrared-luminous, dusty star-forming galaxies (DSFGs) at redshifts 1 to 6. These sour…
View article: Serendipitous discovery of an optically dark ultra-luminous infrared galaxy at <i>z</i> = 3.4
Serendipitous discovery of an optically dark ultra-luminous infrared galaxy at <i>z</i> = 3.4 Open
Dusty, submillimeter-selected galaxies without optical counterparts contribute a non-negligible fraction of the star formation in the early universe. However, such a population is difficult to detect through classical optical/UV-based surv…
View article: HerS-3: An Exceptional Einstein Cross Reveals a Massive Dark Matter Halo
HerS-3: An Exceptional Einstein Cross Reveals a Massive Dark Matter Halo Open
We present a study of HerS-3, a dusty star-forming galaxy at z spec = 3.0607, which is gravitationally amplified into an Einstein cross with a fifth image of the background galaxy seen at the center of the cross. Detailed 1 mm spectroscopy…
View article: A Comparative Study of the Ground State Transitions of CO and C <scp>i</scp> as Molecular Gas Tracers at High Redshift
A Comparative Study of the Ground State Transitions of CO and C <span>i</span> as Molecular Gas Tracers at High Redshift Open
The CO(1–0) and [C i ](1–0) emission lines are well-established tracers of cold molecular gas mass in local galaxies. At high redshift, where the interstellar medium is likely to be denser, there have been limited direct comparisons of bot…
View article: Erratum: ADF22-WEB: A giant barred spiral starburst galaxy in the <i>z</i> = 3.1 SSA22 protocluster core
Erratum: ADF22-WEB: A giant barred spiral starburst galaxy in the <i>z</i> = 3.1 SSA22 protocluster core Open
View article: ADF22-WEB: A giant barred spiral starburst galaxy in the <i>z</i> = 3.1 SSA22 protocluster core
ADF22-WEB: A giant barred spiral starburst galaxy in the <i>z</i> = 3.1 SSA22 protocluster core Open
In the present-day universe, the most massive galaxies are ellipticals located in the cores of galaxy clusters, harboring the heaviest super-massive black holes (SMBHs). However, the mechanisms that drive the early growth phase and subsequ…
View article: ALMACAL
ALMACAL Open
Cold molecular gas, largely traced by CO emission, is the primary fuel for star formation, making it essential for understanding galaxy evolution. ALMA has made significant progress in the study of the cosmic evolution of cold molecular ga…
View article: ALMACAL XIII. Evolution of the CO luminosity function and the molecular gas mass density out to $z$ ~ 6
ALMACAL XIII. Evolution of the CO luminosity function and the molecular gas mass density out to $z$ ~ 6 Open
Cold molecular gas, largely traced by CO emission, is the primary fuel for star formation, making it essential for understanding galaxy evolution. ALMA has made significant progress in the study of the cosmic evolution of cold molecular ga…
View article: ALMA Lensing Cluster Survey: Deep 1.2 mm Number Counts and Infrared Luminosity Functions at z ≃ 1–8
ALMA Lensing Cluster Survey: Deep 1.2 mm Number Counts and Infrared Luminosity Functions at z ≃ 1–8 Open
We present a statistical study of 180 dust continuum sources identified in 33 massive cluster fields by the Atacama Large Millimeter/submillimeter Array Lensing Cluster Survey (ALCS) over a total of 133 arcmin 2 area, homogeneously observe…
View article: A kiloparsec-scale ordered magnetic field in a galaxy at <i>z</i> = 5.6
A kiloparsec-scale ordered magnetic field in a galaxy at <i>z</i> = 5.6 Open
Magnetic fields are widely observed in various astronomical contexts, yet much remains unknown about their significance across different systems and cosmic epochs. Our current knowledge of the evolution of magnetic fields is limited by sca…
View article: ADF22-WEB: A giant barred spiral starburst galaxy in the z = 3.1 SSA22 protocluster core
ADF22-WEB: A giant barred spiral starburst galaxy in the z = 3.1 SSA22 protocluster core Open
In the present-day universe, the most massive galaxies are ellipticals located in the cores of galaxy clusters, harboring the heaviest super-massive black holes (SMBHs). However the mechanisms that drive the early growth phase and subseque…
View article: A novel high-<i>z</i> submm galaxy efficient line survey in ALMA Bands 3 through 8 – an ANGELS pilot
A novel high-<i>z</i> submm galaxy efficient line survey in ALMA Bands 3 through 8 – an ANGELS pilot Open
We use the Atacama Large sub/Millimetre Array (ALMA) to efficiently observe spectral lines across Bands 3, 4, 5, 6, 7, and 8 at high-resolution (0.5–0.1 arcsec) for 16 bright southern Herschel sources at $1.5 \lt z \lt 4.2$. With only six …
View article: A Novel high-z submm Galaxy Efficient Line Survey in ALMA bands 3 through 8 -- An ANGELS Pilot
A Novel high-z submm Galaxy Efficient Line Survey in ALMA bands 3 through 8 -- An ANGELS Pilot Open
We use the Atacama Large sub/Millimetre Array (ALMA) to efficiently observe spectral lines across Bands 3, 4, 5, 6, 7, and 8 at high-resolution (0.5" - 0.1") for 16 bright southern Herschel sources at $1.5 < z < 4.2$. With only six and a h…
View article: MeerKAT observations of Herschel protocluster candidates
MeerKAT observations of Herschel protocluster candidates Open
High-redshift protoclusters consisting of dusty starbursts are thought to play an important role in galaxy evolution. Their dusty nature makes them bright in the far-infrared (FIR)/submm but difficult to find in optical/near-infrared (NIR)…
View article: The UK Submillimetre and Millimetre Astronomy Roadmap 2024
The UK Submillimetre and Millimetre Astronomy Roadmap 2024 Open
In this Roadmap, we present a vision for the future of submillimetre and millimetre astronomy in the United Kingdom over the next decade and beyond. This Roadmap has been developed in response to the recommendation of the Astronomy Advisor…
View article: ALMACAL
ALMACAL Open
The ALMACAL survey is based on a database of reprocessed ALMA calibration scans suitable for scientific analysis, observed as part of regular PI observations. We present all the data accumulated from the start of ALMA operations until May …
View article: First Detection of CO Isotopologues in a High-redshift Main-sequence Galaxy: Evidence of a Top-heavy Stellar Initial Mass Function
First Detection of CO Isotopologues in a High-redshift Main-sequence Galaxy: Evidence of a Top-heavy Stellar Initial Mass Function Open
Recent observations and theories have presented a strong challenge to the universality of the stellar initial mass function (IMF) in extreme environments. A notable example has been found for starburst conditions, where evidence favors a t…
View article: Fast supermassive black hole growth in the SPT2349–56 protocluster at <i>z</i> = 4.3
Fast supermassive black hole growth in the SPT2349–56 protocluster at <i>z</i> = 4.3 Open
Context. Large-scale environment is one of the main physical drivers of galaxy evolution. The densest regions at high redshifts (i.e. z > 2 protoclusters) are gas-rich regions characterised by high star formation activity. The same physica…
View article: Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Surveying the distant Universe
Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Surveying the distant Universe Open
During the most active period of star formation in galaxies, which occurs in the redshift range 1 < z < 3, strong bursts of star formation result in significant quantities of dust, which obscures new stars being formed as their UV/optical …
View article: Fast SMBH growth in the SPT2349--56 protocluster at $z=4.3$
Fast SMBH growth in the SPT2349--56 protocluster at $z=4.3$ Open
Protoclusters at $z>2$ are gas-rich regions characterized by high star-formation activity. The same physical properties that enhance star formation in protoclusters are also thought to boost the growth of SMBHs. We aim to test this scenari…
View article: First detection of CO isotopologues in a high-redshift main-sequence galaxy: evidence of a top-heavy stellar initial mass function
First detection of CO isotopologues in a high-redshift main-sequence galaxy: evidence of a top-heavy stellar initial mass function Open
Recent observations and theories have presented a strong challenge to the universality of the stellar initial mass function (IMF) in extreme environments. A notable example has been found for starburst conditions, where evidence favours a …
View article: A dusty proto-cluster surrounding the binary galaxy HerBS-70 at $z = 2.3$
A dusty proto-cluster surrounding the binary galaxy HerBS-70 at $z = 2.3$ Open
We report on deep SCUBA-2 observations at 850$μ$m and NOEMA spectroscopic measurements at 2 mm of the environment surrounding the luminous, massive ($M_{*} \approx 2 \times 10^{11}$ M$_{\odot}$) Herschel-selected source HerBS-70. This sour…
View article: A dusty protocluster surrounding the binary galaxy HerBS-70 at <i>z</i> = 2.3
A dusty protocluster surrounding the binary galaxy HerBS-70 at <i>z</i> = 2.3 Open
We report on deep SCUBA-2 observations at 850 $\mu$m and NOrthern Extended Millimetre Array (NOEMA) spectroscopic measurements at 2 mm of the environment surrounding the luminous, massive (M* ≈ 2 × 1011 M⊙) Herschel-selected source HerBS-7…
View article: A Comparative Study of the Ground State Transitions of CO and [C I] as Molecular Gas Tracers at High Redshift
A Comparative Study of the Ground State Transitions of CO and [C I] as Molecular Gas Tracers at High Redshift Open
The CO(1--0) and [\ion{C}{1}](1--0) emission lines are well-established tracers of cold molecular gas mass in local galaxies. At high redshift, where the interstellar medium (ISM) is likely to be denser, there have been limited direct comp…
View article: Little evolution of dust emissivity in bright infrared galaxies from 2 &lt; <i>z</i> &lt; 6
Little evolution of dust emissivity in bright infrared galaxies from 2 < <i>z</i> < 6 Open
Variations in the dust emissivity index, $\beta$, within and between galaxies, are evidence that the chemistry and physics of dust must vary on large scales, although the nature of the physical and/or chemical variations is still unknown. …
View article: Little evolution of dust emissivity in bright infrared galaxies from $2 < z < 6$
Little evolution of dust emissivity in bright infrared galaxies from $2 < z < 6$ Open
Variations in the dust emissivity index, $β$, within and between galaxies, are evidence that the chemistry and physics of dust must vary on large scales, although the nature of the physical and/or chemical variations is still unknown. In t…
View article: Licking the plate: Dusty star-forming galaxies buried in the ALMA calibration data
Licking the plate: Dusty star-forming galaxies buried in the ALMA calibration data Open
Deep, unbiased surveys are essential to decipher the cosmic evolution of galaxies. The submillimetre (submm) and millimetre (mm) windows complement the UV/optical waveband and are key to revealing the cold and dusty Universe. Traditional w…