Colin Jacobs

The AGEL Survey Data Release 2: A Gravitational Lens Sample for Galaxy Evolution and Cosmology

Tania M. Barone, Keerthi Vasan G.C., Kim‐Vy Tran, Glenn G. Kacprzak et autres

Abstract The ASTRO 3D Galaxy Evolution with Lenses (AGEL) Survey is an ongoing effort to spectroscopically confirm a diverse sample of gravitational lenses with high spatial resolution imaging, to facilitate a broad range of science outcomes. The AGEL systems span single galaxy-scale …

Connecting Environment, Star Formation History, and Morphology of Massive Quiescent Galaxies at $3

Lalitwadee Kawinwanichakij, Karl Glazebrook, Themiya Nanayakkara, Glenn G. Kacprzak et autres

We present the morphological properties of 17 spectroscopically confirmed massive quiescent galaxies ($10.2 < \log(M_{\ast}/M_{\odot}) < 11.2$) at $3.0 < z < 4.3$, observed with JWST/NIRSpec and NIRCam. Using Sérsic profile fits to F277W and F444W imaging, we derive the size-mass relation …

The AGEL Survey Data Release 2: A Gravitational Lens Sample for Galaxy Evolution and Cosmology

Tania M. Barone, Keerthi Vasan G. C., Kim‐Vy Tran, Glenn G. Kacprzak et autres

The ASTRO 3D Galaxy Evolution with Lenses (AGEL) Survey is an ongoing effort to spectroscopically confirm a diverse sample of gravitational lenses with high spatial resolution imaging, to facilitate a broad range of science outcomes. The AGEL systems span single galaxy-scale deflectors …

The Formation Histories of Massive and Quiescent Galaxies in the 3 < z < 4.5 Universe

Themiya Nanayakkara, Karl Glazebrook, C. Schreiber, Harry George Chittenden et autres

Abstract We present the formation histories of 19 massive (≳3 × 10 10 M ⊙ ) quiescent (specific star formation rate, sSFR < 0.15 Gyr −1 ) galaxy candidates at z ~ 3.0–4.5 observed using JWST/NIRSpec. This completes the spectroscopic confirmation of …

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The formation histories of massive and quiescent galaxies in the 3 < z < 4.5 Universe

Themiya Nanayakkara, Karl Glazebrook, C. Schreiber, Harry Chittenden et autres

We present the formation histories of 19 massive ($>3X10^{10}M_\odot$) quiescent (sSFR$<0.15Gyr^{-1}$) galaxy candidates at z~3.0-4.5 observed using JWST/NIRSpec. This completes the spectroscopic confirmation of the 24 K-selected quiescent galaxy sample from the ZFOURGE and 3DHST surveys (Schreiber et al. 2018a). Utilizing Prism …

The origin of large emission line widths in massive galaxies at redshifts z ∼ 3–4

M. Martìnez-Marìn, Karl Glazebrook, Themiya Nanayakkara, Colin Jacobs et autres

ABSTRACT We present a sample of 22 massive galaxies with stellar masses >1010 M⊙ at 3 < z < 4 with deep H and K-band high resolution spectra (R = 3500–3000) from Keck/MOSFIRE and VLT/KMOS near-infrared spectrographs. We find a large fraction …

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hayate : photometric redshift estimation by hybridizing machine learning with template fitting

Shingo Tanigawa, Karl Glazebrook, Colin Jacobs, Ivo Labbé et autres

ABSTRACT Machine learning photo-z methods, trained directly on spectroscopic redshifts, provide a viable alternative to traditional template-fitting methods but may not generalize well on new data that deviates from that in the training set. In this work, we present a Hybrid Algorithm …

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Impacts of source morphology on the detectability of subhalos in strong lenses

Tyler Hughes, Karl Glazebrook, Colin Jacobs

We provide an analysis of a convolutional neural network's ability to identify the lensing signal of single dark matter subhalos in strong galaxy-galaxy lenses in the presence of increasingly complex source light morphology. We simulate a balanced dataset of 800,000 strong lens …

A population of faint, old, and massive quiescent galaxies at $$3<z<4$$ revealed by JWST NIRSpec Spectroscopy

Themiya Nanayakkara, Karl Glazebrook, Colin Jacobs, Lalitwadee Kawinwanichakij et autres

Here we present a sample of 12 massive quiescent galaxy candidates at [Formula: see text] observed with the James Webb Space Telescope (JWST) Near Infrared Spectrograph (NIRSpec). These galaxies were pre-selected from the Hubble Space Telescope imaging and 10 of our sources …

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A massive galaxy that formed its stars at z ≈ 11

Karl Glazebrook, Themiya Nanayakkara, C. Schreiber, Claudia del P. Lagos et autres

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HAYATE: Photometric redshift estimation by hybridising machine learning with template fitting

Shingo Tanigawa, Karl Glazebrook, Colin Jacobs, Ivo Labbé et autres

Machine learning photo-z methods, trained directly on spectroscopic redshifts, provide a viable alternative to traditional template fitting methods but may not generalise well on new data that deviates from that in the training set. In this work, we present a Hybrid Algorithm …

Resolved Velocity Profiles of Galactic Winds at Cosmic Noon

Keerthi Vasan G. C., Tucker Jones, Ryan L. Sanders, Richard S. Ellis et autres

Abstract We study the kinematics of the interstellar medium (ISM) viewed “down the barrel” in 20 gravitationally lensed galaxies during cosmic noon (z = 1.5–3.5). We use moderate-resolution spectra (R ∼ 4000) from Keck’s Echellette Spectrograph and Imager and Magellan/MagE to spectrally …

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