Skip to main content

Research Repository

Advanced Search

Jacobus Van Loon's Outputs (193)

The ASKAP-EMU Early Science Project: 888 MHz radio continuum survey of the Large Magellanic Cloud (2021)
Journal Article
Pennock, C. M., Van Loon, J. T., Filipović, M. D., Andernach, H., Haberl, F., Kothes, R., …Vardoulaki, E. (2021). The ASKAP-EMU Early Science Project: 888 MHz radio continuum survey of the Large Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 506(3), 3540 - 3559. https://doi.org/10.1093/mnras/stab1858

We present an analysis of a new 120 deg2 radio continuum image of the Large Magellanic Cloud (LMC) at 888 MHz with a bandwidth of 288 MHz and beam size of 13${_{.}^{\prime\prime}}$9 × 12${_{.}^{\prime\prime}}$1 from the Australian Square Kilometre Ar... Read More about The ASKAP-EMU Early Science Project: 888 MHz radio continuum survey of the Large Magellanic Cloud.

Massive stars in extremely metal-poor galaxies: a window into the past (2021)
Journal Article
Garcia, M., Evans, C. J., Bestenlehner, J. M., Bouret, J. C., Castro, N., Cervino, M., …Wofford, A. (2021). Massive stars in extremely metal-poor galaxies: a window into the past. Experimental Astronomy, 51(3), 887-911. https://doi.org/10.1007/s10686-021-09785-x

Cosmic history has witnessed the lives and deaths of multiple generations of massive stars, all of them invigorating their host galaxies with ionizing photons, kinetic energy, fresh material, and stellar-mass black holes. Ubiquitous engines as they a... Read More about Massive stars in extremely metal-poor galaxies: a window into the past.

The VMC Survey – XL. Three-dimensional structure of the Small Magellanic Cloud as derived from red clump stars (2021)
Journal Article
Tatton, B. L., Van Loon, J. T., Cioni, M. L., Bekki, K., Bell, C. P. M., Choudhury, S., …Sun, N. (2021). The VMC Survey – XL. Three-dimensional structure of the Small Magellanic Cloud as derived from red clump stars. Monthly Notices of the Royal Astronomical Society, 504(2), 2983 - 2997. https://doi.org/10.1093/mnras/staa3857

Galaxy interactions distort the distribution of baryonic matter and can affect star formation. The nearby Magellanic Clouds are a prime example of an ongoing galaxy interaction process. Here, we use the intermediate-age (similar to 1-10 Gyr) red clum... Read More about The VMC Survey – XL. Three-dimensional structure of the Small Magellanic Cloud as derived from red clump stars.

Stellar substructures in the periphery of the magellanic clouds with the VISTA hemisphere survey from the red clump and other tracers (2021)
Journal Article
El Youssoufi, D., Cioni, M. L., Bell, C. P. M., de Grijs, R., Groenewegen, M. A. T., Ivanov, V. D., …Van Loon, J. T. (2021). Stellar substructures in the periphery of the magellanic clouds with the VISTA hemisphere survey from the red clump and other tracers. Monthly Notices of the Royal Astronomical Society, 505(2), 2020-2038. https://doi.org/10.1093/mnras/stab1075

We study the morphology of the stellar periphery of the Magellanic Clouds in search of substructure using near–infrared imaging data from the VISTA Hemisphere Survey (VHS). Based on the selection of different stellar populations using the (J - Ks, Ks... Read More about Stellar substructures in the periphery of the magellanic clouds with the VISTA hemisphere survey from the red clump and other tracers.

The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. IV. The Star Formation History of Andromeda VII Derived from Long-period Variable Stars (2021)
Journal Article
Van Loon. (2021). The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. IV. The Star Formation History of Andromeda VII Derived from Long-period Variable Stars. Astrophysical Journal, 127 - 127. https://doi.org/10.3847/1538-4357/abdec1

We have examined the star formation history (SFH) of Andromeda VII (And VII), the brightest and most massive dwarf spheroidal (dSph) satellite of the Andromeda galaxy (M31). Although M31 is surrounded by several dSph companions with old stellar popul... Read More about The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. IV. The Star Formation History of Andromeda VII Derived from Long-period Variable Stars.

The VMC Survey – XLII. Near-infrared period–luminosity relations for RR Lyrae stars and the structure of the Large Magellanic Cloud (2021)
Journal Article
Cusano, F., Moretti, M. I., Clementini, G., Ripepi, V., Marconi, M., Cioni, M. L., …Van Loon, J. T. (2021). The VMC Survey – XLII. Near-infrared period–luminosity relations for RR Lyrae stars and the structure of the Large Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 504(1), 1 - 15. https://doi.org/10.1093/mnras/stab901

We present results from an analysis of ~29?000 RR Lyrae stars located in the Large Magellanic Cloud (LMC). For these objects, near-infrared time-series photometry from the VISTA survey of the Magellanic Clouds system (VMC) and optical data from the O... Read More about The VMC Survey – XLII. Near-infrared period–luminosity relations for RR Lyrae stars and the structure of the Large Magellanic Cloud.

Evolutionary map of the Universe (EMU): Compact radio sources in the scorpio field towards the galactic plane (2021)
Journal Article
Van Loon. (2021). Evolutionary map of the Universe (EMU): Compact radio sources in the scorpio field towards the galactic plane. Monthly Notices of the Royal Astronomical Society, 60 - 79. https://doi.org/10.1093/mnras/stab028

We present observations of a region of the Galactic plane taken during the Early Science Program of the Australian Square Kilometre Array Pathfinder (ASKAP). In this context, we observed the scorpio field at 912MHz with an uncompleted array consistin... Read More about Evolutionary map of the Universe (EMU): Compact radio sources in the scorpio field towards the galactic plane.

The VMC survey – XLI. Stellar proper motions within the Small Magellanic Cloud (2021)
Journal Article
Niederhofer, F., Cioni, M. L., Rubele, S., Schmidt, T., Diaz, J. D., Matijevĭc, G., …Van Loon, J. T. (2021). The VMC survey – XLI. Stellar proper motions within the Small Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 2859 - 2878. https://doi.org/10.1093/mnras/stab206

We used data from the near-infrared Visible and Infrared Telescope for Astronomy (VISTA) survey of the Magellanic Cloud system (VMC) to measure proper motions (PMs) of stars within the Small Magellanic Cloud (SMC). The data analysed in this study com... Read More about The VMC survey – XLI. Stellar proper motions within the Small Magellanic Cloud.

Gaia view of a stellar sub-structure in front of the Small Magellanic Cloud (2021)
Journal Article
Van Loon. (2021). Gaia view of a stellar sub-structure in front of the Small Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 2757-2776. https://doi.org/10.1093/mnras/staa3085

Recent observational studies identified a foreground stellar sub-structure traced by red clump (RC) stars (~ 12 kpc in front of the main body) in the eastern regions of the Small Magellanic Cloud (SMC) and suggested that it formed during the formatio... Read More about Gaia view of a stellar sub-structure in front of the Small Magellanic Cloud.

The VMC survey XXXVIII. Proper motion of the Magellanic Bridge (2020)
Journal Article
Van Loon, & Oliveira. (2020). The VMC survey XXXVIII. Proper motion of the Magellanic Bridge. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202037478

Context. The Magellanic Clouds are a nearby pair of interacting dwarf galaxies and satellites of the Milky Way. Studying their kinematic properties is essential to understanding their origin and dynamical evolution. They have prominent tidal features... Read More about The VMC survey XXXVIII. Proper motion of the Magellanic Bridge.

The intrinsic reddening of the Magellanic Clouds as traced by background galaxies – II. The Small Magellanic Cloud (2020)
Journal Article
Bell, C. P. M., Cioni, M. L., Wright, A. H., Rubele, S., Nidever, D. L., Tatton, B. L., …Vivas, A. K. (2020). The intrinsic reddening of the Magellanic Clouds as traced by background galaxies – II. The Small Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 499(1), 993 -1004. https://doi.org/10.1093/mnras/staa2786

We present a map of the total intrinsic reddening across ? 34 deg2 of the Small Magellanic Cloud (SMC) derived using optical (ugriz) and near-infrared (IR; YJKs) spectral energy distributions (SEDs) of background galaxies. The reddening map is create... Read More about The intrinsic reddening of the Magellanic Clouds as traced by background galaxies – II. The Small Magellanic Cloud.

Constraining the thermally pulsing asymptotic giant branch phase with resolved stellar populations in the Large Magellanic Cloud (2020)
Journal Article
Van Loon. (2020). Constraining the thermally pulsing asymptotic giant branch phase with resolved stellar populations in the Large Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 3283-3301. https://doi.org/10.1093/mnras/staa2565

Reliable models of the thermally pulsing asymptotic giant branch (TP-AGB) phase are of critical importance across astrophysics, including our interpretation of the spectral energy distribution of galaxies, cosmic dust production, and enrichment of th... Read More about Constraining the thermally pulsing asymptotic giant branch phase with resolved stellar populations in the Large Magellanic Cloud.

The VMC survey – XXXIX: Mapping metallicity trends in the Small Magellanic Cloud using near-infrared passbands (2020)
Journal Article
Choudhury, S., de Grijs, R., Rubele, S., Bekki, K., Cioni, M. L., Ivanov, V. D., …Ripepi, V. (2020). The VMC survey – XXXIX: Mapping metallicity trends in the Small Magellanic Cloud using near-infrared passbands. Monthly Notices of the Royal Astronomical Society, 497(3), 3746-3760. https://doi.org/10.1093/mnras/staa2140

We have derived high spatial resolution metallicity maps covering ~42 deg2 across the Small Magellanic Cloud (SMC) in an attempt to understand its metallicity distribution and gradients up to a radius of ~ 4?. Using the near-infrared VISTA Survey of... Read More about The VMC survey – XXXIX: Mapping metallicity trends in the Small Magellanic Cloud using near-infrared passbands.

The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. I. Survey Overview and First Results for Andromeda I (2020)
Journal Article
Saremi, E., Javadi, A., Van Loon, J., Khosroshahi, H., Molaeinezhad, A., McDonald, I., …Gozaliasl, G. (2020). The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. I. Survey Overview and First Results for Andromeda I. Astrophysical Journal, 894(2), Article ARTN 135. https://doi.org/10.3847/1538-4357/ab88a2

An optical monitoring survey in nearby dwarf galaxies was carried out with the 2.5 m Isaac Newton Telescope. Fifty-five dwarf galaxies and four isolated globular clusters in the Local Group were observed with the Wide Field Camera. The main aims of t... Read More about The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. I. Survey Overview and First Results for Andromeda I.

The VMC Survey - XXXVII. Pulsation periods of dust-enshrouded AGB stars in the Magellanic Clouds (2020)
Journal Article
Groenewegen, M. A. T., Nanni, A., Cioni, M. L., Girardi, L., de Grijs, R., Ivanov, V. D., …Van Loon, J. T. (2020). The VMC Survey - XXXVII. Pulsation periods of dust-enshrouded AGB stars in the Magellanic Clouds. Astronomy and Astrophysics, 636, Article A48. https://doi.org/10.1051/0004-6361/201937271

Context. Variability is a key property of stars on the asymptotic giant branch (AGB). Their pulsation period is related to the luminosity and mass-loss rate of the star. Long-period variables (LPVs) and Mira variables are the most prominent of all ty... Read More about The VMC Survey - XXXVII. Pulsation periods of dust-enshrouded AGB stars in the Magellanic Clouds.

The VMC survey – XXXVI. Young stellar variability in the Large Magellanic Cloud (2020)
Journal Article
Zivkov, V., Oliveira, J. M., Petr-Gotzens, M. G., Rubele, S., Cioni, M. L., Van Loon, J. T., …Sun, N. (2020). The VMC survey – XXXVI. Young stellar variability in the Large Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 494(1), 458 -486. https://doi.org/10.1093/mnras/staa626

Studies of young stellar objects (YSOs) in the Galaxy have found that a significant fraction exhibits photometric variability. However, no systematic investigation has been conducted on the variability of extragalactic YSOs. Here we present the first... Read More about The VMC survey – XXXVI. Young stellar variability in the Large Magellanic Cloud.

A new mass-loss rate prescription for red supergiants (2020)
Journal Article
Beasor, E. R., Davies, B., Smith, N., Van Loon, J. T., Gehrz, R. D., & Figer, D. F. (2020). A new mass-loss rate prescription for red supergiants. Monthly Notices of the Royal Astronomical Society, 492(4), 5994 - 6006. https://doi.org/10.1093/mnras/staa255

Evolutionary models have shown the substantial effect that strong mass-loss rates ($\dotM$s) can have on the fate of massive stars. Red supergiant (RSG) mass-loss is poorly understood theoretically, and so stellar models rely on purely empirical $\do... Read More about A new mass-loss rate prescription for red supergiants.

High Angular Resolution ALMA Images of Dust and Molecules in the SN 1987A Ejecta (2019)
Journal Article
Van Loon. (2019). High Angular Resolution ALMA Images of Dust and Molecules in the SN 1987A Ejecta. Astrophysical Journal, https://doi.org/10.3847/1538-4357/ab4b46

We present high angular resolution (similar to 80 mas) ALMA continuum images of the SN.1987A system, together with CO J = 2 -> 1, J = 6 -> 5, and SiO J = 5 -> 4 to J = 7 -> 6 images, which clearly resolve the ejecta (dust continuum and molecules) and... Read More about High Angular Resolution ALMA Images of Dust and Molecules in the SN 1987A Ejecta.