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A New Dissociative Galaxy Cluster Merger: RM J150822.0+575515.2
Finner, Kyle; Wittman, David; Stancioli, Rodrigo +1 more
Galaxy cluster mergers that exhibit clear dissociation between their dark matter, intracluster gas, and stellar components are great laboratories for probing dark matter properties. Mergers that are binary and in the plane of the sky have the additional advantage of being simpler to model, allowing for a better understanding of the merger dynamics…
Comparing transit spectroscopy pipelines at the catalogue level: evidence for systematic differences
Swain, Mark R.; Estrela, Raissa; Roudier, Gael M. +1 more
The challenge of inconsistent results from different data pipelines, even when starting from identical data, is a recognized concern in exoplanetary science. As we transition into the JWST era and prepare for the ARIEL space mission, addressing this issue becomes paramount because of its implications on our understanding of exoplanets. Although co…
[O IV]- and [Ne V]-weak Active Galactic Nuclei Hidden by Compton-thick Material in Late Mergers
Imanishi, Masatoshi; Wada, Keiichi; Tanimoto, Atsushi +10 more
We study "buried" active galactic nuclei (AGNs) almost fully covered by circumnuclear material in ultra/luminous infrared galaxies (U/LIRGs), which show weak ionized lines from narrow-line regions. Employing an indicator of a [O IV] 25.89 or [Ne V] 14.32 µm line to 12 µm AGN luminosity ratio, we find 17 buried AGN candidates that are […
Gas-dynamical Mass Measurements of the Supermassive Black Holes in the Early-type Galaxies NGC 4786 and NGC 5193 from ALMA and HST Observations
Ho, Luis C.; Barth, Aaron J.; Buote, David A. +10 more
We present molecular gas-dynamical mass measurements of the central black holes in the giant elliptical galaxies NGC 4786 and NGC 5193, based on CO (2‑1) observations from the Atacama Large Millimeter/submillimeter Array (ALMA) and Hubble Space Telescope near-infrared imaging. The central region in each galaxy contains a circumnuclear disk that ex…
The Outflowing [O II] Nebulae of Compact Starburst Galaxies at z ∼ 0.5
Moustakas, John; Coil, Alison L.; Rudnick, Gregory H. +11 more
High-velocity outflows are ubiquitous in compact, massive (M * ∼ 1011 M ⊙), z ∼ 0.5 galaxies with extreme star formation surface densities (ΣSFR ∼ 2000 M ⊙ yr‑1 kpc‑2). We have previously detected and characterized these outflows using Mg II absorption lines. To probe the…
Testing the near-far connection with FIRE simulations: inferring the stellar mass function of the proto-Local Group at z > 6 using the fossil record of present-day galaxies
Faucher-Giguère, Claude-André; Weisz, Daniel R.; Savino, Alessandro +6 more
The shape of the low-mass (faint) end of the galaxy stellar mass function (SMF) or ultraviolet luminosity function (UVLF) at $z \gtrsim 6$ is an open question for understanding which galaxies primarily drove cosmic reionization. Resolved photometry of Local Group low-mass galaxies allows us to reconstruct their star formation histories, stellar ma…
The variable stars in the field of the bulge cluster NGC 6558
Arellano Ferro, A.; Bustos Fierro, I. H.; Prudil, Z. +3 more
We made a survey of the variable stars in a 13.2 × 13.2 arcmin$^{2}$ centred on the field of the Galactic bulge cluster NGC 6558. A total of 78 variables were found in the field of the cluster. Many of these variables are included in the catalogue of variable stars in Galactic globular clusters (Clement et al. 2001), OGLE or Gaia DR3 data releases…
The XMM-Newton and NuSTAR view of IRASF11119+3257: I. Detection of multiple ultra fast outflow components and a very cold corona
Veilleux, S.; Bianchi, S.; Cappi, M. +21 more
Context. IRASF11119+3257 is an ultra-luminous infrared galaxy with a post-merger morphology, hosting a type-1 quasar at z = 0.189. It shows a prominent ultra-fast outflow (UFO) absorption feature (vout ∼ 0.25c) in its 2013 Suzaku spectrum. This is the first system in which the energy released by the UFO was compared to that of the known…
The tight correlation between PAH and CO emission from z ∼ 0 to 4
Boogaard, Leindert A.; Shivaei, Irene
Aims. The cold molecular gas mass is one of the crucial, yet challenging, parameters in galaxy evolution studies. Here, we introduce a new calibration and a method for estimating molecular gas masses using mid-infrared (MIR) photometry. This topic is timely as the James Webb Space Telescope (JWST) now allows us to detect the MIR emission of typica…
The [Y/Mg] chemical clock in the Galactic disk: The influence of metallicity and the Galactic population in the solar neighbourhood
Meléndez, Jorge; Shejeelammal, J.; Rathsam, Anne +1 more
Context. Stellar ages are an important parameter in studies of the chemical evolution of the Galaxy. To better estimate these ages, various methods complementary to the conventional isochrone fitting method have been implemented in the past decade. Several recent studies have established the existence of a relationship between chemical clocks and …