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Dr Guillaume Mahler's Outputs (24)

JWST/NIRCam Probes Young Star Clusters in the Reionization Era Sunrise Arc (2023)
Journal Article
Vanzella, E., Claeyssens, A., Welch, B., Adamo, A., Coe, D., Diego, J. M., Mahler, G., Khullar, G., Kokorev, V., Oguri, M., Ravindranath, S., Furtak, L. J., Hsiao, T. Y.-Y., Abdurro'uf, Mandelker, N., Brammer, G., Bradley, L. D., Bradač, M., Conselice, C. J., Dayal, P., …Norman, C. (2023). JWST/NIRCam Probes Young Star Clusters in the Reionization Era Sunrise Arc. Astrophysical Journal, 945(1), Article 53. https://doi.org/10.3847/1538-4357/acb59a

Star cluster formation in the early universe and its contribution to reionization remains largely unconstrained to date. Here we present JWST/NIRCam imaging of the most highly magnified galaxy known at z ∼ 6, the Sunrise arc. We identify six young ma... Read More about JWST/NIRCam Probes Young Star Clusters in the Reionization Era Sunrise Arc.

Hubble Constant Measurement from Three Large-separation Quasars Strongly Lensed by Galaxy Clusters (2023)
Journal Article
Napier, K., Sharon, K., Dahle, H., Bayliss, M., Gladders, M. D., Mahler, G., …Florian, M. (2023). Hubble Constant Measurement from Three Large-separation Quasars Strongly Lensed by Galaxy Clusters. Astrophysical Journal, 959(2), Article 134. https://doi.org/10.3847/1538-4357/ad045a

Tension between cosmic microwave background–based and distance ladder–based determinations of the Hubble constant H 0 motivates the pursuit of independent methods that are not subject to the same systematic effects. A promising alternative, proposed... Read More about Hubble Constant Measurement from Three Large-separation Quasars Strongly Lensed by Galaxy Clusters.

Exploring the correlation between dark matter, intracluster light, and globular cluster distribution in SMACS0723 (2023)
Journal Article
Diego, J. M., Pascale, M., Frye, B., Zitrin, A., Broadhurst, T., Mahler, G., …Montes, M. (2023). Exploring the correlation between dark matter, intracluster light, and globular cluster distribution in SMACS0723. Astronomy & Astrophysics, 679, Article A159. https://doi.org/10.1051/0004-6361/202345868

We present a free-form model of SMACS0723, the first cluster observed with JWST. This model does not make any strong assumptions on the distribution of mass (mostly made up of dark matter) in the cluster and we use it to study the possible correlatio... Read More about Exploring the correlation between dark matter, intracluster light, and globular cluster distribution in SMACS0723.

JWST's TEMPLATES for Star Formation: The First Resolved Gas-phase Metallicity Maps of Dust-obscured Star-forming Galaxies at z ∼ 4 (2023)
Journal Article
Birkin, J. E., Hutchison, T. A., Welch, B., Spilker, J. S., Aravena, M., Bayliss, M. B., Cathey, J., Chapman, S. C., Gonzalez, A. H., Gururajan, G., Hayward, C. C., Khullar, G., Kim, K. J., Mahler, G., Malkan, M. A., Narayanan, D., Olivier, G. M., Phadke, K. A., Reuter, C., Rigby, J. R., …Weiss, A. (2023). JWST's TEMPLATES for Star Formation: The First Resolved Gas-phase Metallicity Maps of Dust-obscured Star-forming Galaxies at z ∼ 4. Astrophysical Journal, 958(1), 64. https://doi.org/10.3847/1538-4357/acf712

We present the first spatially resolved maps of gas-phase metallicity for two dust-obscured star-forming galaxies at z ∼ 4, from the JWST TEMPLATES Early Release Science program, derived from NIRSpec integral field unit spectroscopy of the Hα and [N... Read More about JWST's TEMPLATES for Star Formation: The First Resolved Gas-phase Metallicity Maps of Dust-obscured Star-forming Galaxies at z ∼ 4.

A new step forward in realistic cluster lens mass modelling: analysis of Hubble Frontier Field Cluster Abell S1063 from joint lensing, X-ray, and galaxy kinematics data (2023)
Journal Article
Beauchesne, B., Clément, B., Hibon, P., Limousin, M., Eckert, D., Kneib, J., …Sánchez, J. (2024). A new step forward in realistic cluster lens mass modelling: analysis of Hubble Frontier Field Cluster Abell S1063 from joint lensing, X-ray, and galaxy kinematics data. Monthly Notices of the Royal Astronomical Society, 527(2), 3246–3275. https://doi.org/10.1093/mnras/stad3308

We present a new method to simultaneously and self-consistently model the mass distribution of galaxy clusters that combines constraints from strong lensing features, X-ray emission, and galaxy kinematics measurements. We are able to successfully dec... Read More about A new step forward in realistic cluster lens mass modelling: analysis of Hubble Frontier Field Cluster Abell S1063 from joint lensing, X-ray, and galaxy kinematics data.

Probing the faint-end luminosity function of Lyman-alpha emitters at 3 < z < 7 behind 17 MUSE lensing clusters (2023)
Journal Article
Thai, T. T., Tuan-Anh, P., Pello, R., Goovaerts, I., Richard, J., Claeyssens, A., …Matthee, J. (2023). Probing the faint-end luminosity function of Lyman-alpha emitters at 3 < z < 7 behind 17 MUSE lensing clusters. Astronomy & Astrophysics, 678, Article A139. https://doi.org/10.1051/0004-6361/202346716

Context. This paper presents a study of the galaxy Lyman-alpha luminosity function (LF) using a large sample of 17 lensing clusters observed by the Multi Unit Spectroscopic Explorer (MUSE) at the ESO Very Large Telescope (VLT). The magnification resu... Read More about Probing the faint-end luminosity function of Lyman-alpha emitters at 3 < z < 7 behind 17 MUSE lensing clusters.

Reaching for the stars – JWST/NIRSpec spectroscopy of a lensed star candidate at z = 4.76 (2023)
Journal Article
Furtak, L. J., Meena, A. K., Zackrisson, E., Zitrin, A., Brammer, G. B., Coe, D., …Wilkins, S. M. (2024). Reaching for the stars – JWST/NIRSpec spectroscopy of a lensed star candidate at z = 4.76. Monthly Notices of the Royal Astronomical Society: Letters, 527(1), L7–L13. https://doi.org/10.1093/mnrasl/slad135

We present JWST/NIRSpec observations of a highly magnified star candidate at a photometric redshift of zphot ≃ 4.8, previously detected in JWST/NIRCam imaging of the strong lensing (SL) cluster MACS J0647+7015 (z = 0.591). The spectroscopic observati... Read More about Reaching for the stars – JWST/NIRSpec spectroscopy of a lensed star candidate at z = 4.76.

Small Region, Big Impact: Highly Anisotropic Lyman-continuum Escape from a Compact Starburst Region with Extreme Physical Properties (2023)
Journal Article
Kim, K. J., Bayliss, M. B., Rigby, J. R., Gladders, M. D., Chisholm, J., Sharon, K., …Roberson, J. (2023). Small Region, Big Impact: Highly Anisotropic Lyman-continuum Escape from a Compact Starburst Region with Extreme Physical Properties. Astrophysical Journal Letters, 955(1), Article L17. https://doi.org/10.3847/2041-8213/acf0c5

Extreme, young stellar populations are considered to be the primary contributor to cosmic reionization. How the Lyman continuum (LyC) escapes these galaxies remains highly elusive, and it is challenging to observe this process in actual LyC emitters... Read More about Small Region, Big Impact: Highly Anisotropic Lyman-continuum Escape from a Compact Starburst Region with Extreme Physical Properties.

COOL-LAMPS. IV. A Sample of Bright Strongly Lensed Galaxies at 3 < z < 4 (2023)
Journal Article
Zhang, Y., Manwadkar, V., Gladders, M. D., Khullar, G., Dahle, H., Napier, K. A., …Zaborowski, E. (2023). COOL-LAMPS. IV. A Sample of Bright Strongly Lensed Galaxies at 3 < z < 4. Astrophysical Journal, 950(1), Article 58. https://doi.org/10.3847/1538-4357/acc9be

We report the discovery of five bright, strong gravitationally lensed galaxies at 3 < z < 4: COOL J0101+2055 (z = 3.459), COOL J0104−0757 (z = 3.480), COOL J0145+1018 (z = 3.310), COOL J0516−2208 (z = 3.549), and COOL J1356+0339 (z = 3.753). These ga... Read More about COOL-LAMPS. IV. A Sample of Bright Strongly Lensed Galaxies at 3 < z < 4.

JWST Reveals a Possible z ∼ 11 Galaxy Merger in Triply Lensed MACS0647–JD (2023)
Journal Article
Hsiao, T. Y., Coe, D., Abdurro’uf, Whitler, L., Jung, I., Khullar, G., …Welch, B. (2023). JWST Reveals a Possible z ∼ 11 Galaxy Merger in Triply Lensed MACS0647–JD. Astrophysical Journal Letters, 949(2), Article L34. https://doi.org/10.3847/2041-8213/acc94b

MACS0647–JD is a triply lensed z ∼ 11 galaxy originally discovered with the Hubble Space Telescope. The three lensed images are magnified by factors of ∼8, 5, and 2 to AB mag 25.1, 25.6, and 26.6 at 3.5 μm. The brightest is over a magnitude brighter... Read More about JWST Reveals a Possible z ∼ 11 Galaxy Merger in Triply Lensed MACS0647–JD.

Redshift Evolution of the Feedback–Cooling Equilibrium in the Core of 48 SPT Galaxy Clusters: A Joint Chandra–SPT–ATCA Analysis (2023)
Journal Article
Ruppin, F., McDonald, M., Hlavacek-Larrondo, J., Bayliss, M., Bleem, L., Calzadilla, M., Edge, A., Filipović, M., Floyd, B., Garmire, G., Khullar, G., Kim, K., Kraft, R., Mahler, G., Norris, R., O’Brien, A., Reichardt, C., Somboonpanyakul, T., Stark, A., & Tothill, N. (2023). Redshift Evolution of the Feedback–Cooling Equilibrium in the Core of 48 SPT Galaxy Clusters: A Joint Chandra–SPT–ATCA Analysis. Astrophysical Journal, 948(1), Article 49. https://doi.org/10.3847/1538-4357/acc38d

We analyze the cooling and feedback properties of 48 galaxy clusters at redshifts 0.4 < z < 1.3 selected from the South Pole Telescope (SPT) catalogs to evolve like the progenitors of massive and well-studied systems at z ∼ 0. We estimate the radio p... Read More about Redshift Evolution of the Feedback–Cooling Equilibrium in the Core of 48 SPT Galaxy Clusters: A Joint Chandra–SPT–ATCA Analysis.

A search for transients in the Reionization Lensing Cluster Survey (RELICS): three new supernovae (2023)
Journal Article
Golubchik, M., Zitrin, A., Pierel, J., Furtak, L. J., Meena, A. K., Graur, O., …Su, Y. (2023). A search for transients in the Reionization Lensing Cluster Survey (RELICS): three new supernovae. Monthly Notices of the Royal Astronomical Society, 522(3), 4718–4727. https://doi.org/10.1093/mnras/stad1238

The Reionization Cluster Survey imaged 41 galaxy clusters with the Hubble Space Telescope (HST), in order to detect lensed and high-redshift galaxies. Each cluster was imaged to about 26.5 AB mag in three optical and four near-infrared bands, taken i... Read More about A search for transients in the Reionization Lensing Cluster Survey (RELICS): three new supernovae.

SPT-CL J2215−3537: A Massive Starburst at the Center of the Most Distant Relaxed Galaxy Cluster (2023)
Journal Article
Calzadilla, M. S., Bleem, L. E., McDonald, M., Gladders, M. D., Mantz, A. B., Allen, S. W., …Stark, A. A. (2023). SPT-CL J2215−3537: A Massive Starburst at the Center of the Most Distant Relaxed Galaxy Cluster. Astrophysical Journal, 947(2), Article 44. https://doi.org/10.3847/1538-4357/acc6c2

We present the discovery of the most distant, dynamically relaxed cool core cluster, SPT-CL J2215−3537 (SPT2215), and its central brightest cluster galaxy (BCG) at z = 1.16. Using new X-ray observations, we demonstrate that SPT2215 harbors a strong c... Read More about SPT-CL J2215−3537: A Massive Starburst at the Center of the Most Distant Relaxed Galaxy Cluster.

RXJ0437+00: constraining dark matter with exotic gravitational lenses (2023)
Journal Article
Lagattuta, D. J., Richard, J., Ebeling, H., Basto, Q., Cerny, C., Edge, A., Jauzac, M., Mahler, G., & Massey, R. (2023). RXJ0437+00: constraining dark matter with exotic gravitational lenses. Monthly Notices of the Royal Astronomical Society, 522(1), 1091-1107. https://doi.org/10.1093/mnras/stad803

We present the first strong-gravitational-lensing analysis of the galaxy cluster RX J0437.1+0043 (RXJ0437; z = 0.285). Newly obtained, deep MUSE observations, Keck/MOSFIRE near-infrared spectroscopy, and Hubble Space Telescope SNAPshot imaging reveal... Read More about RXJ0437+00: constraining dark matter with exotic gravitational lenses.

COOL–LAMPS. III. Discovery of a 25.″9 Separation Quasar Lensed by a Merging Galaxy Cluster*   (2023)
Journal Article
Martinez, M. N., Napier, K. A., Cloonan, A. P., Sukay, E., Gozman, K., Merz, K., …Gladders, M. D. (2023). COOL–LAMPS. III. Discovery of a 25.″9 Separation Quasar Lensed by a Merging Galaxy Cluster*  . Astrophysical Journal, 946(2), Article 63. https://doi.org/10.3847/1538-4357/acbe39

In the third paper from the COOL–LAMPS Collaboration, we report the discovery of COOL J0542-2125, a gravitationally lensed quasar at z = 1.84, observed as three images due to an intervening massive galaxy cluster at z = 0.61. The lensed quasar images... Read More about COOL–LAMPS. III. Discovery of a 25.″9 Separation Quasar Lensed by a Merging Galaxy Cluster*  .

Joint HST, VLT/MUSE, and XMM−Newton observations to constrain the mass distribution of the two strong lensing galaxy clusters: MACS J0242.5-2132 and MACS J0949.8+1708 (2023)
Journal Article
Allingham, J. F. V., Jauzac, M., Lagattuta, D. J., Mahler, G., Bœhm, C., Lewis, G. F., …Ettori, S. (2023). Joint HST, VLT/MUSE, and XMM−Newton observations to constrain the mass distribution of the two strong lensing galaxy clusters: MACS J0242.5-2132 and MACS J0949.8+1708. Monthly Notices of the Royal Astronomical Society, 522(1), 1118-1137. https://doi.org/10.1093/mnras/stad917

Precision Modeling of JWST's First Cluster Lens SMACS J0723.3–7327* (2023)
Journal Article
Mahler, G., Jauzac, M., Richard, J., Beauchesne, B., Ebeling, H., Lagattuta, D., Natarajan, P., Sharon, K., Atek, H., Claeyssens, A., Clément, B., Eckert, D., Edge, A., Kneib, J.-P., & Niemiec, A. (2023). Precision Modeling of JWST's First Cluster Lens SMACS J0723.3–7327*. Astrophysical Journal, 945(1), Article 49. https://doi.org/10.3847/1538-4357/acaea9

Exploiting the fundamentally achromatic nature of gravitational lensing, we present a lens model for the massive galaxy cluster SMACS J0723.3−7323 (SMACS J0723; z = 0.388) that significantly improves upon earlier work. Building on strong-lensing cons... Read More about Precision Modeling of JWST's First Cluster Lens SMACS J0723.3–7327*.