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Star formation characteristics of CNN-identified post-mergers in the Ultraviolet Near Infrared Optical Northern Survey (UNIONS)
Ellison, Sara L.; Gwyn, Stephen; Hudson, Michael J. +3 more
The importance of the post-merger epoch in galaxy evolution has been well documented, but post-mergers are notoriously difficult to identify. While the features induced by mergers can sometimes be distinctive, they are frequently missed by visual inspection. In addition, visual classification efforts are highly inefficient because of the inherent …
LoTSS jellyfish galaxies. III. The first identification of jellyfish galaxies in the Perseus cluster
Botteon, A.; van Weeren, R. J.; Ignesti, A. +4 more
In this paper we report the first identification of jellyfish galaxies in the Perseus cluster (Abell 426). We identified four jellyfish galaxies (LEDA 2191078, MCG +07-07-070, UGC 2654, UGC 2665) within the central 2° ×2° (2.6 Mpc × 2.6 Mpc) of Perseus based on the presence of one-sided radio continuum tails that were detected at 144 MHz by the LO…
Constraining Galaxy Overdensities around Three z 6.5 Quasars with ALMA and MUSE
Li, Qiong; Walter, Fabian; Meyer, Romain A. +6 more
We quantify galaxy overdensities around three high-redshift quasars with known [C II]158 µm companions: PJ231-20 (z = 6.59), PJ308-21 (z = 6.24), and J0305-3150 (z = 6.61). Recent SCUBA2 imaging revealed the presence of 17 submillimeter galaxies (SMGs) with sky separations 0.'7 < θ < 2.'4 from these three quasars. We present…
APOGEE Net: An Expanded Spectral Model of Both Low-mass and High-mass Stars
Stassun, Keivan G.; Kounkel, Marina; Beaton, Rachael L. +17 more
We train a convolutional neural network, APOGEE Net, to predict T eff, $\mathrm{log}g$ , and, for some stars, [Fe/H], based on the APOGEE spectra. This is the first pipeline adapted for these data that is capable of estimating these parameters in a self-consistent manner not only for low-mass stars, (such as main-sequence dwarfs, pre-ma…
Non-LTE abundance corrections for late-type stars from 2000 Å to 3 µm. I. Na, Mg, and Al
Sneden, C.; Lind, K.; Barklem, P. S. +6 more
Context. It is well known that cool star atmospheres depart from local thermodynamic equilibrium (LTE). Making an accurate abundance determination requires taking those effects into account, but the necessary non-LTE (hereafter NLTE) calculations are often lacking.
Aims: Our goal is to provide detailed estimates of NLTE effects for FGK type s…
Statistics of galaxy mergers: bridging the gap between theory and observation
Baugh, Carlton M.; Lacey, Cedric G.; Huško, Filip
We present a study of galaxy mergers up to z = 10 using the Planck Millennium cosmological dark matter simulation and the GALFORM semi-analytical model of galaxy formation. Utilizing the full 800 Mpc3 volume of the simulation, we studied the statistics of galaxy mergers in terms of merger rates and close pair fractions. We predict that …
A Uniform Type Ia Supernova Distance Ladder with the Zwicky Transient Facility: Absolute Calibration Based on the Tip of the Red Giant Branch Method
Riddle, Reed; Madore, Barry F.; Freedman, Wendy L. +21 more
The current Cepheid-calibrated distance ladder measurement of H 0 is reported to be in tension with the values inferred from the cosmic microwave background (CMB), assuming standard cosmology. However, some tip of the red giant branch (TRGB) estimates report H 0 in better agreement with the CMB. Hence, it is critical to reduc…
Planetary nebula luminosity function distances for 19 galaxies observed by PHANGS-MUSE
Van Dyk, Schuyler D.; Kruijssen, J. M. Diederik; Rosolowsky, Erik +15 more
We provide new planetary nebula luminosity function (PNLF) distances to 19 nearby spiral galaxies that were observed with VLT/MUSE by the PHANGS collaboration. Emission line ratios are used to separate planetary nebulae (PNe) from other bright $[\mathrm{O}\, {\small III}]$ emitting sources like compact supernovae remnants (SNRs) or H II regions. W…
GASKAP-HI pilot survey science I: ASKAP zoom observations of HI emission in the Small Magellanic Cloud
van Loon, J. Th.; Lee, M. -Y.; Joncas, G. +53 more
We present the most sensitive and detailed view of the neutral hydrogen ( ${H\small I}$ ) emission associated with the Small Magellanic Cloud (SMC), through the combination of data from the Australian Square Kilometre Array Pathfinder (ASKAP) and Parkes (Murriyang), as part of the Galactic Australian Square Kilometre Array Pathfinder (GASKAP) pilo…
Reconstructing the Pleiades with Gaia EDR3
Caiazzo, Ilaria; Richer, Harvey B.; Heyl, Jeremy
We search through an eight million cubic parsec volume surrounding the Pleiades star cluster and the Sun to identify both the current and past members of the Pleiades cluster within the Gaia EDR3 data set. We find nearly 1300 current cluster members and 289 former cluster candidates. Many of these candidates lie well in front of or behind the clus…