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Jacobus Van Loon's Outputs (191)

Binarity at LOw Metallicity (BLOeM): A spectroscopic VLT monitoring survey of massive stars in the SMC (2024)
Journal Article
Shenar, T., Bodensteiner, J., Sana, H., Crowther, P. A., Lennon, D. J., Abdul-Masih, M., …Willcox, R. (2024). Binarity at LOw Metallicity (BLOeM): A spectroscopic VLT monitoring survey of massive stars in the SMC. Astronomy & Astrophysics, 690, 22. https://doi.org/10.1051/0004-6361/202451586

Surveys in the Milky Way and Large Magellanic Cloud have revealed that the majority of massive stars will interact with companions during their lives. However, knowledge of the binary properties of massive stars at low metallicity, and therefore in c... Read More about Binarity at LOw Metallicity (BLOeM): A spectroscopic VLT monitoring survey of massive stars in the SMC.

Local H i absorption towards the magellanic cloud foreground using ASKAP (2024)
Journal Article
Nguyen, H., McClure-Griffiths, N. M., Dempsey, J., Dickey, J. M., Lee, M.-Y., Lynn, C., …van Loon, J. T. (in press). Local H i absorption towards the magellanic cloud foreground using ASKAP. Monthly Notices of the Royal Astronomical Society, https://doi.org/10.1093/mnras/stae2274

We present the largest Galactic neutral hydrogen H i absorption survey to date, utilizing the Australian SKA Pathfinder Telescope at an unprecedented spatial resolution of 30″. This survey, GASKAP-H i, unbiasedly targets 2,714 continuum background so... Read More about Local H i absorption towards the magellanic cloud foreground using ASKAP.

The Complex Star Formation History of the Halo of NGC 5128 (Cen A) (2024)
Journal Article
Aghdam, S. T., Javadi, A., Hashemi, S., Abdollahi, M., van Loon, J. T., Khosroshahi, H., …Saberi, M. (2024). The Complex Star Formation History of the Halo of NGC 5128 (Cen A). Astrophysical Journal, 972(1), Article 47. https://doi.org/10.3847/1538-4357/ad57c0

NGC 5128 (Cen A) is the nearest giant elliptical galaxy and one of the brightest extragalactic radio sources in the sky, boasting a prominent dust lane and jets emanating from its nuclear supermassive black hole. In this paper, we construct the star... Read More about The Complex Star Formation History of the Halo of NGC 5128 (Cen A).

New quasars behind the Magellanic Clouds: II. Spectroscopic confirmation of 136 near-infrared selected candidates (2024)
Journal Article
Ivanov, V. D., Cioni, M.-R. L., Dennefeld, M., de Grijs, R., Craig, J. E. M., van Loon, J. T., …Haberl, F. (2024). New quasars behind the Magellanic Clouds: II. Spectroscopic confirmation of 136 near-infrared selected candidates. Astronomy & Astrophysics, 687, Article A16. https://doi.org/10.1051/0004-6361/202346504

Context. Quasi-stellar objects (QSOs) are a basis for an absolute reference system for astrometric studies. A system like this at the far side of nearby galaxies is required to facilitate measuring of the proper motions of these galaxies. However, th... Read More about New quasars behind the Magellanic Clouds: II. Spectroscopic confirmation of 136 near-infrared selected candidates.

The EDIBLES Survey: VIII. Band profile alignment of diffuse interstellar bands (2024)
Journal Article
Ebenbichler, A., Smoker, J. V., Lallement, R., Farhang, A., Cox, N. L. J., Joblin, C., …Cordiner, M. (2024). The EDIBLES Survey: VIII. Band profile alignment of diffuse interstellar bands. Astronomy & Astrophysics, 686, Article A50. https://doi.org/10.1051/0004-6361/202348871

Context. There have been many attempts to identify families of diffuse interstellar bands (DIBs) with perfectly correlating band strengths. Although major efforts have been made to classify broadly based DIB families and important insights have been... Read More about The EDIBLES Survey: VIII. Band profile alignment of diffuse interstellar bands.

SMC-Last Extracted Photometry (2024)
Journal Article
Kuchar, T. A., Sloan, G. C., Mizuno, D. R., Kraemer, K. E., Boyer, M. L., Groenewegen, M. A. T., …Zijlstra, A. (2024). SMC-Last Extracted Photometry. Astronomical Journal, 167(4), Article 149. https://doi.org/10.3847/1538-3881/ad2601

We present point-source photometry from the Spitzer Space Telescope's final survey of the Small Magellanic Cloud (SMC). We mapped nearly 30 deg2 in two epochs in 2017, with the second extending to early 2018 at 3.6 and 4.5 μm using the Infrared Array... Read More about SMC-Last Extracted Photometry.

The MeerKAT 1.3 GHz Survey of the Small Magellanic Cloud (2024)
Journal Article
Cotton, W. D., Filipović, M. D., Camilo, F., Indebetouw, R., Alsaberi, R. Z. E., Anih, J. O., …Serylak, M. (in press). The MeerKAT 1.3 GHz Survey of the Small Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 529(3), 2443-2472. https://doi.org/10.1093/mnras/stae277

We present new radio continuum images and a source catalogue from the MeerKAT survey in the direction of the Small Magellanic Cloud (SMC). The observations, at a central frequency of 1.3 GHz across a bandwidth of 0.8 GHz, encompass a field of view ∼7... Read More about The MeerKAT 1.3 GHz Survey of the Small Magellanic Cloud.

A Galactic Eclipse: The Small Magellanic Cloud Is Forming Stars in Two Superimposed Systems (2024)
Journal Article
Murray, C. E., Hasselquist, S., Peek, J. E. G., Lindberg, C. W., Almeida, A., Choi, Y., …van Loon, J. T. (2024). A Galactic Eclipse: The Small Magellanic Cloud Is Forming Stars in Two Superimposed Systems. Astrophysical Journal, 962(2), Article 120. https://doi.org/10.3847/1538-4357/ad1591

The structure and dynamics of the star-forming disk of the Small Magellanic Cloud (SMC) have long confounded us. The SMC is widely used as a prototype for galactic physics at low metallicity, and yet we fundamentally lack an understanding of the stru... Read More about A Galactic Eclipse: The Small Magellanic Cloud Is Forming Stars in Two Superimposed Systems.

The EDIBLES survey: VII. A survey of C2 and C3 in interstellar clouds (2023)
Journal Article
Fan, H., Rocha, C. M. R., Cordiner, M., Linnartz, H., Cox, N. L. J., Farhang, A., …Cami, J. (2024). The EDIBLES survey: VII. A survey of C2 and C3 in interstellar clouds. Astronomy & Astrophysics, 681, Article A6. https://doi.org/10.1051/0004-6361/202243910

Context. Small linear carbon chain radicals such as C2 and C3 act as both the building blocks and dissociation fragments of larger carbonaceous species. Their rotational excitation traces the temperature and density of local environments. However, th... Read More about The EDIBLES survey: VII. A survey of C2 and C3 in interstellar clouds.

ALMA Observations of Supernova Remnant N49 in the Large Magellanic Cloud. II. Non-LTE Analysis of Shock-heated Molecular Clouds (2023)
Journal Article
Sano, H., Yamane, Y., van Loon, J. T., Furuya, K., Fukui, Y., Alsaberi, R. Z. E., …Tachihara, K. (2023). ALMA Observations of Supernova Remnant N49 in the Large Magellanic Cloud. II. Non-LTE Analysis of Shock-heated Molecular Clouds. Astrophysical Journal, 958(1), Article 53. https://doi.org/10.3847/1538-4357/acffbe

We present the first compelling evidence of shock-heated molecular clouds associated with the supernova remnant (SNR) N49 in the Large Magellanic Cloud (LMC). Using 12CO(J = 2–1, 3–2) and 13CO(J = 2–1) line emission data taken with the Atacama Large... Read More about ALMA Observations of Supernova Remnant N49 in the Large Magellanic Cloud. II. Non-LTE Analysis of Shock-heated Molecular Clouds.

ATCA Study of Small Magellanic Cloud Supernova Remnant 1E 0102.2–7219 (2023)
Journal Article
Alsaberi, R. Z. E., Filipović, M. D., Dai, S., Sano, H., Kothes, R., Payne, J. L., …Vogt, F. P. A. (2024). ATCA Study of Small Magellanic Cloud Supernova Remnant 1E 0102.2–7219. Monthly Notices of the Royal Astronomical Society, 527(1), 1444-1460. https://doi.org/10.1093/mnras/stad3300

We present new and archival Australia Telescope Compact Array and Atacama Large Millimeter/submillimeter Array data of the Small Magellanic Cloud supernova remnant 1E 0102.2–7219 at 2100, 5500, 9000, and 108000 MHz; as well as H i data provided by th... Read More about ATCA Study of Small Magellanic Cloud Supernova Remnant 1E 0102.2–7219.

The EDIBLES survey: VI. Searching for time variations of interstellar absorption features (2023)
Journal Article
Farhang, A., Smoker, J., Cox, N. L. J., Cami, J., Linnartz, H., van Loon, J. T., …Laverick, M. (2023). The EDIBLES survey: VI. Searching for time variations of interstellar absorption features. Astronomy & Astrophysics, 678, Article A148. https://doi.org/10.1051/0004-6361/202037581

Context. Interstellar absorption observed toward stellar targets changes slowly over long timescales, mainly due to the proper motion of the background target relative to the intervening clouds, such that over time, different parts of the intervening... Read More about The EDIBLES survey: VI. Searching for time variations of interstellar absorption features.

A new method for spatially resolving the turbulence driving mixture in the ISM with application to the Small Magellanic Cloud (2023)
Journal Article
Gerrard, I. A., Federrath, C., Pingel, N. M., McClure-Griffiths, N. M., Marchal, A., Joncas, G., …Lynn, C. (2023). A new method for spatially resolving the turbulence driving mixture in the ISM with application to the Small Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 526(1), https://doi.org/10.1093/mnras/stad2718

Turbulence plays a crucial role in shaping the structure of the interstellar medium. The ratio of the three-dimensional density contrast ($\sigma _{\rho /\rho _0}$) to the turbulent sonic Mach number ($\mathcal {M}$) of an isothermal, compressible ga... Read More about A new method for spatially resolving the turbulence driving mixture in the ISM with application to the Small Magellanic Cloud.

Hubble Space Telescope imaging of the compact elliptical galaxy M32 reveals a dearth of carbon stars (2023)
Journal Article
Jones, O. C., Boyer, M. L., McDonald, I., Meixner, M., & van Loon, J. T. (2023). Hubble Space Telescope imaging of the compact elliptical galaxy M32 reveals a dearth of carbon stars. Monthly Notices of the Royal Astronomical Society, 525(3), 3693-3702. https://doi.org/10.1093/mnras/stad2472

We present new Hubble Space Telescope WFC3/IR medium-band photometry of the compact elliptical galaxy M32, chemically resolving its thermally pulsating asymptotic giant branch stars. We find 2829 M-type stars and 57 C stars. The carbon stars are like... Read More about Hubble Space Telescope imaging of the compact elliptical galaxy M32 reveals a dearth of carbon stars.