Dr GARRETH MARTIN's Outputs (15)

Intracluster light is a biased tracer of the dark matter distribution in clusters (2025)
Journal Article
Butler, J., Martin, G., Hatch, N., Pearce, F., Brough, S., & Dubois, Y. (2025). Intracluster light is a biased tracer of the dark matter distribution in clusters. Monthly Notices of the Royal Astronomical Society, Article staf615. https://doi.org/10.1093/mnras/staf615

The diffuse stellar component of galaxy clusters known as intracluster light (ICL) has been proposed as an observable tracer of the cluster’s dark matter (DM) halo. Assessing its reliability as a DM tracer requires understanding how the intracluster... Read More about Intracluster light is a biased tracer of the dark matter distribution in clusters.

New tools for studying planarity in galaxy satellite systems: Milky Way satellite planes are consistent with ΛCDM (2024)
Journal Article
Uzeirbegovic, E., Martin, G., Kaviraj, S., Jackson, R., Kraljic, K., Dubois, Y., Pichon, C., Devriendt, J., Peirani, S., Silk, J., & Yi, S. (2024). New tools for studying planarity in galaxy satellite systems: Milky Way satellite planes are consistent with ΛCDM. Monthly Notices of the Royal Astronomical Society, 535(4), 3775-3784. https://doi.org/10.1093/mnras/stae2632

We introduce a new concept – termed ‘planarity’ – which aims to quantify planar structure in galaxy satellite systems without recourse to the number or thickness of planes. We use positions and velocities from the Gaia EDR3 to measure planarity in Mi... Read More about New tools for studying planarity in galaxy satellite systems: Milky Way satellite planes are consistent with ΛCDM.

UVCANDELS: Catalogs of Photometric Redshifts and Galaxy Physical Properties (2024)
Journal Article
Mehta, V., Rafelski, M., Sunnquist, B., Teplitz, H. I., Scarlata, C., Wang, X., Fontana, A., Hathi, N. P., Iyer, K. G., Alavi, A., Colbert, J., Grogin, N., Koekemoer, A., Nedkova, K. V., Hayes, M., Prichard, L., Siana, B., Smith, B. M., Windhorst, R., Ashcraft, T., …The UVCANDELS Team. (2024). UVCANDELS: Catalogs of Photometric Redshifts and Galaxy Physical Properties. Astrophysical Journal Supplement, 275(1), Article 17. https://doi.org/10.3847/1538-4365/ad7d8f

The UltraViolet imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) program provides deep Hubble Space Telescope (HST) F275W and F435W imaging over four CANDELS fields (GOODS-N, GOODS-S, COSMOS, and Extend... Read More about UVCANDELS: Catalogs of Photometric Redshifts and Galaxy Physical Properties.

Stellar stripping efficiencies of satellites in numerical simulations: the effect of resolution, satellite properties, and numerical disruption (2024)
Journal Article
Martin, G., Pearce, F. R., Hatch, N. A., Contreras-Santos, A., Knebe, A., & Cui, W. (2024). Stellar stripping efficiencies of satellites in numerical simulations: the effect of resolution, satellite properties, and numerical disruption. Monthly Notices of the Royal Astronomical Society, 535(3), 2375–2393. https://doi.org/10.1093/mnras/stae2488

The stellar stripping of satellites in cluster haloes is understood to play an important role in the production of intracluster light. Increasingly, cosmological simulations have been utilized to investigate its origin and assembly. However, such sim... Read More about Stellar stripping efficiencies of satellites in numerical simulations: the effect of resolution, satellite properties, and numerical disruption.

RMS asymmetry: a robust metric of galaxy shapes in images with varied depth and resolution (2024)
Journal Article
Sazonova, E., Morgan, C. R., Balogh, M., Alatalo, K., Benavides, J. A., Bluck, A., Brough, S., Busa, I., Demarco, R., Donevski, D., Figueira, M., Martin, G., Mullaney, J. R., Rodriguez-Gomez, V., Román, J., & Rowlands, K. (in press). RMS asymmetry: a robust metric of galaxy shapes in images with varied depth and resolution. Open Journal of Astrophysics, 7, https://doi.org/10.33232/001c.123524

Structural disturbances, such as galaxy mergers or instabilities, are key candidates for driving galaxy evolution, so it is important to detect and quantify galaxies hosting these disturbances spanning a range of masses, environments, and cosmic time... Read More about RMS asymmetry: a robust metric of galaxy shapes in images with varied depth and resolution.

Assembly of the intracluster light in the Horizon-AGN simulation (2024)
Journal Article
Brown, H. J., Martin, G., Pearce, F. R., Hatch, N. A., Bahé, Y. M., & Dubois, Y. (2024). Assembly of the intracluster light in the Horizon-AGN simulation. Monthly Notices of the Royal Astronomical Society, 534(1), 431-443. https://doi.org/10.1093/mnras/stae2084

The diffuse stellar component of galaxy clusters made up of intergalactic stars is termed the intracluster light (ICL). Although there is a developing understanding of the mechanisms by which the ICL is formed, no strong consensus has yet been reache... Read More about Assembly of the intracluster light in the Horizon-AGN simulation.

The Ultraviolet Luminosity Function at 0.6 < z < 1 from UVCANDELS (2024)
Journal Article
Sun, L., Wang, X., Teplitz, H. I., Mehta, V., Alavi, A., Rafelski, M., Windhorst, R. A., Scarlata, C., Gardner, J. P., Smith, B. M., Sunnquist, B., Prichard, L., Cheng, Y., Grogin, N., Hathi, N. P., Hayes, M., Koekemoer, A. M., Mobasher, B., Nedkova, K. V., O’Connell, R., …the UVCANDELS team. (2024). The Ultraviolet Luminosity Function at 0.6 < z < 1 from UVCANDELS. The Astrophysical Journal, 972(1), Article 8. https://doi.org/10.3847/1538-4357/ad5540

UVCANDELS is a Hubble Space Telescope Cycle-26 Treasury Program awarded 164 orbits of primary ultraviolet (UV) F275W imaging and coordinated parallel optical F435W imaging in four CANDELS fields—GOODS-N, GOODS-S, EGS, and COSMOS—covering a total area... Read More about The Ultraviolet Luminosity Function at 0.6 < z < 1 from UVCANDELS.

The structural properties of nearby dwarf galaxies in low-density environments – size, surface brightness, and colour gradients (2024)
Journal Article
Lazar, I., Kaviraj, S., Watkins, A. E., Martin, G., Bichang’a, B., & Jackson, R. A. (2024). The structural properties of nearby dwarf galaxies in low-density environments – size, surface brightness, and colour gradients. Monthly Notices of the Royal Astronomical Society, 533(4), 3771-3783. https://doi.org/10.1093/mnras/stae1956

We use a complete sample of 211 nearby ( z < 0 . 08), dwarf (10 8 M☉ < M * < 10 9 . 5 M☉ galaxies in low-density environments, to study their structural properties: effective radii ( Re ), effective surface brightnesses ( ⟨μ⟩e ), and colour gradients... Read More about The structural properties of nearby dwarf galaxies in low-density environments – size, surface brightness, and colour gradients.

LIGHTS. Survey Overview and a Search for Low Surface Brightness Satellite Galaxies (2024)
Journal Article
Zaritsky, D., Golini, G., Donnerstein, R., Trujillo, I., Akhlaghi, M., Chamba, N., D’Onofrio, M., Eskandarlou, S., Hosseini-ShahiSavandi, S. Z., Infante-Sainz, R., Martin, G., Montes, M., Román, J., Sedighi, N., & Sharbaf, Z. (2024). LIGHTS. Survey Overview and a Search for Low Surface Brightness Satellite Galaxies. Astronomical Journal, 168(2), Article 69. https://doi.org/10.3847/1538-3881/ad543f

We present an overview of the LBT Imaging of Galactic Halos and Tidal Structures survey, which currently includes 25 nearby galaxies that are on average ∼1 mag fainter than the Milky Way, and a catalog of 54 low central surface brightness (24 < μ 0,g... Read More about LIGHTS. Survey Overview and a Search for Low Surface Brightness Satellite Galaxies.

The properties of AGN in dwarf galaxies identified via SED fitting (2024)
Journal Article
Bichang’a, B., Kaviraj, S., Lazar, I., Jackson, R. A., Das, S., Smith, D. J., Watkins, A. E., & Martin, G. (2024). The properties of AGN in dwarf galaxies identified via SED fitting. Monthly Notices of the Royal Astronomical Society, 532(1), 613-621. https://doi.org/10.1093/mnras/stae1441

Given their dominance of the galaxy number density, dwarf galaxies are central to our understanding of galaxy formation. While the incidence of active galactic nuclei (AGN) and their impact on galaxy evolution have been extensively studied in massive... Read More about The properties of AGN in dwarf galaxies identified via SED fitting.

Characterizing tidal features around galaxies in cosmological simulations (2024)
Journal Article
Khalid, A., Brough, S., Martin, G., Kimmig, L., Lagos, C., Remus, R.-S., & Martinez-Lombilla, C. (2024). Characterizing tidal features around galaxies in cosmological simulations. Monthly Notices of the Royal Astronomical Society, 530(4), 4422–4445. https://doi.org/10.1093/mnras/stae1064

Tidal features provide signatures of recent mergers and offer a unique insight into the assembly history of galaxies. The Vera C. Rubin Observatory’s Legacy Survey of Space and Time (LSST) will enable an unprecedentedly large survey of tidal features... Read More about Characterizing tidal features around galaxies in cosmological simulations.

A Physically Motivated Framework to Compare Pair Fractions of Isolated Low- and High-mass Galaxies across Cosmic Time (2024)
Journal Article
Chamberlain, K., Besla, G., Patel, E., Rodriguez-Gomez, V., Torrey, P., Martin, G., Johnson, K., Kallivayalil, N., Patton, D., Pearson, S., Privon, G., & Stierwalt, S. (2024). A Physically Motivated Framework to Compare Pair Fractions of Isolated Low- and High-mass Galaxies across Cosmic Time. Astrophysical Journal, 962(2), Article 162. https://doi.org/10.3847/1538-4357/ad19d0

Low-mass galaxy pair fractions are understudied, and it is unclear whether low-mass pair fractions evolve in the same way as more massive systems over cosmic time. In the era of JWST, Roman, and Rubin, selecting galaxy pairs in a self-consistent way... Read More about A Physically Motivated Framework to Compare Pair Fractions of Isolated Low- and High-mass Galaxies across Cosmic Time.

The morphological mix of dwarf galaxies in the nearby Universe (2024)
Journal Article
Lazar, I., Kaviraj, S., Watkins, A., Martin, G., Bichang’a, B., & Jackson, R. (2024). The morphological mix of dwarf galaxies in the nearby Universe. Monthly Notices of the Royal Astronomical Society, 529(1), 499-518. https://doi.org/10.1093/mnras/stae510

We use a complete, unbiased sample of 257 dwarf (10⁠) galaxies at z < 0.08, in the COSMOS field, to study the morphological mix of the dwarf population in low-density environments. Visual inspection of extremely deep optical images and their unsharp-... Read More about The morphological mix of dwarf galaxies in the nearby Universe.

Ultraviolet and Blue Optical Imaging of UVCANDELS (2024)
Journal Article
Wang, X., Teplitz, H. I., Sun, L., Rafelski, M., Grogin, N., Prichard, L., Sunnquist, B., Alavi, A., Windhorst, R. A., Koekemoer, A. M., Ashcraft, T., Bagley, M., Baronchelli, I., Barro, G., Blanche, A., Brammer, G., Broussard, A., Carleton, T., Chartab, N., Cheng, Y., …Zabelle, B. (2024). Ultraviolet and Blue Optical Imaging of UVCANDELS. Research Notes of the American Astronomical Society, 8(1), Article 26. https://doi.org/10.3847/2515-5172/ad1f6f

The UltraViolet Imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) survey provided ultraviolet F275W imaging with coordinated parallel optical F435W imaging in four of the five CANDELS fields: GOODS-N, GO... Read More about Ultraviolet and Blue Optical Imaging of UVCANDELS.

The formation of cores in galaxies across cosmic time - the existence of cores is not in tension with the ΛCDM paradigm (2024)
Journal Article
Jackson, R. A., Kaviraj, S., Yi, S. K., Peirani, S., Dubois, Y., Martin, G., Devriendt, J. E. G., Slyz, A., Pichon, C., Volonteri, M., Kimm, T., & Kraljic, K. (2024). The formation of cores in galaxies across cosmic time - the existence of cores is not in tension with the ΛCDM paradigm. Monthly Notices of the Royal Astronomical Society, 528(2), 1655–1667. https://doi.org/10.1093/mnras/stae056

The 'core-cusp' problem is considered a key challenge to the ΛCDM paradigm. Haloes in dark matter only simulations exhibit 'cuspy' profiles, where density continuously increases towards the centre. However, the dark matter profiles of many observed g... Read More about The formation of cores in galaxies across cosmic time - the existence of cores is not in tension with the ΛCDM paradigm.