Zobrazeno 1 - 10
of 177
pro vyhledávání: '"Jacco Th. van Loon"'
Autor:
T. A. Kuchar, G. C. Sloan, D. R. Mizuno, Kathleen E. Kraemer, M. L. Boyer, Martin A. T. Groenewegen, O. C. Jones, F. Kemper, Iain McDonald, Joana M. Oliveira, Marta Sewiło, Sundar Srinivasan, Jacco Th. van Loon, Albert Zijlstra
Publikováno v:
The Astronomical Journal, Vol 167, Iss 4, p 149 (2024)
We present point-source photometry from the Spitzer Space Telescope's final survey of the Small Magellanic Cloud (SMC). We mapped nearly 30 deg ^2 in two epochs in 2017, with the second extending to early 2018 at 3.6 and 4.5 μ m using the Infrared A
Externí odkaz:
https://doaj.org/article/733b108d8c474263aca0dfd34c39b401
Autor:
Claire E. Murray, Sten Hasselquist, Joshua E. G. Peek, Christina Willecke Lindberg, Andres Almeida, Yumi Choi, Jessica E. M. Craig, Helga Dénes, John M. Dickey, Enrico M. Di Teodoro, Christoph Federrath, Isabella. A. Gerrard, Steven J. Gibson, Denis Leahy, Min-Young Lee, Callum Lynn, Yik Ki Ma, Antoine Marchal, N. M. McClure-Griffiths, David Nidever, Hiep Nguyen, Nickolas M. Pingel, Elizabeth Tarantino, Lucero Uscanga, Jacco Th. van Loon
Publikováno v:
The Astrophysical Journal, Vol 962, Iss 2, p 120 (2024)
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
Externí odkaz:
https://doaj.org/article/6a31f8868b5d4663a0b92fdef9fce35d
Autor:
Hedieh Abdollahi, Atefeh Javadi, Mohammad Taghi Mirtorabi, Elham Saremi, Jacco Th. van Loon, Habib G. Khosroshahi, Iain McDonald, Elahe Khalouei, Hamidreza Mahani, Sima Taefi Aghdam, Maryam Saberi, Maryam Torki
Publikováno v:
The Astrophysical Journal, Vol 948, Iss 1, p 63 (2023)
We present a photometric study of the resolved stellar populations in Andromeda IX (And IX), the closest satellite to M31, a metal-poor and low-mass dwarf spheroidal galaxy. We estimate a distance modulus of ${24.56}_{-0.15}^{+0.05}$ mag based on the
Externí odkaz:
https://doaj.org/article/443eeb12be9c47ee97cdb3a880592f57
Autor:
Tahere Parto, Shahrzad Dehghani, Atefeh Javadi, Elham Saremi, Jacco Th. van Loon, Habib G. Khosroshahi, Iain McDonald, Mohammad T. Mirtorabi, Mahdieh Navabi, Maryam Saberi
Publikováno v:
The Astrophysical Journal, Vol 942, Iss 1, p 33 (2023)
We conducted an optical monitoring survey of the Sagittarius dwarf irregular galaxy (SagDIG) during the period of 2016 June–2017 October, using the 2.5 m Isaac Newton Telescopeat La Palama. Our goal was to identify long-period variable stars (LPVs)
Externí odkaz:
https://doaj.org/article/8e108e7fdaf6429f94612b5b920b03df
Publikováno v:
Universe, Vol 7, Iss 7, p 233 (2021)
Background: Most of the stars in the Universe will end their evolution by losing their envelope during the thermally pulsing asymptotic giant branch (TP-AGB) phase, enriching the interstellar medium of galaxies with heavy elements, partially condense
Externí odkaz:
https://doaj.org/article/b3484307884a46559014c9a0b2d00615
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 517:140-160
We present a supervised machine learning classification of stellar populations in the Local Group spiral galaxy M\,33. The Probabilistic Random Forest (PRF) methodology, previously applied to populations in NGC\,6822, utilises both near and far-IR cl
Autor:
Cameron P M Bell, Maria-Rosa L Cioni, Angus H Wright, David L Nidever, I-Da Chiang, Samyaday Choudhury, Martin A T Groenewegen, Clara M Pennock, Yumi Choi, Richard de Grijs, Valentin D Ivanov, Pol Massana, Ambra Nanni, Noelia E D Noël, Knut Olsen, Jacco Th van Loon, A Katherina Vivas, Dennis Zaritsky
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 516:824-840
We present a map of the total intrinsic reddening across ~90 deg$^{2}$ of the Large Magellanic Cloud (LMC) derived using optical (ugriz) and near-infrared (IR; YJKs) spectral energy distributions (SEDs) of background galaxies. The reddening map is cr
Autor:
Dalal El Youssoufi, Maria-Rosa L Cioni, Nikolay Kacharov, Cameron P M Bell, Gal Matjević, Kenji Bekki, Richard de Grijs, Valentin D Ivanov, Jacco Th van Loon
We present a kinematic analysis of the Small Magellanic Cloud using 3700 spectra extracted from the European Southern Observatory archive. We used data from Gaia and near-infrared photometry to select stellar populations and discard Galactic foregrou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::03999f1739c8e53922be1f29a4ab9a58
Autor:
Tahere Parto, Shahrzad Dehghani, Atefeh Javadi, Elham Saremi, Jacco Th. van Loon, Habib G. Khosroshahi, Iain McDonald, Mohammad T. Mirtorabi, Mahdieh Navabi, Maryam Saberi
We conducted an optical monitoring survey of the Sagittarius dwarf irregular galaxy (SagDIG) during the period of June 2016 -- October 2017, using the 2.5-m Isaac Newton Telescope (INT) at La Palama. Our goal was to identify Long Period Variable star
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::775e236bb6b7146242c0a8cb201716a1
http://arxiv.org/abs/2211.10695
http://arxiv.org/abs/2211.10695
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 507:5106-5131
We present a supervised machine learning methodology to classify stellar populations in the Local Group dwarf-irregular galaxy NGC6822. Near-IR colours (J-H, H-K, and J-K), K-band magnitudes and far-IR surface brightness (at 70 and 160 micron) measur