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Multi-probe analysis of the galaxy cluster CL J1226.9+3332. Hydrostatic mass and hydrostatic-to-lensing bias
Berta, S.; Aussel, H.; Adam, R. +50 more
The precise estimation of the mass of galaxy clusters is a major issue for cosmology. Large galaxy cluster surveys rely on scaling laws that relate cluster observables to their masses. From the high-resolution observations of ∼45 galaxy clusters with the NIKA2 and XMM-Newton instruments, the NIKA2 Sunyaev-Zel'dovich Large Program should provide an…
Dark matter substructures affect dark matter-electron scattering in xenon-based direct detection experiments
Laha, Ranjan; Maity, Tarak Nath
Recent sky surveys have discovered a large number of stellar substructures. It is highly likely that there are dark matter (DM) counterparts to these stellar substructures. We examine the implications of DM substructures for electron recoil (ER) direct detection (DD) rates in dual phase xenon experiments. We have utilized the results of the LAMOST…
Variability in a low-mass active galactic nucleus: oscillation or eruption?
Young, A. J.; Webbe, Robbie
Following the discovery of a new class of X-ray variability seen in four galaxies, dubbed quasi-periodic eruptions (QPEs), we reconsider the variability seen in the low-mass active galactic nucleus (AGN) 2XMM J123103.2+110648 to ascertain whether it should be considered a QPE host galaxy. We apply the autocorrelation function to two archival XMM-N…
ΣSFR-M∗ Diagram: A Valuable Galaxy Evolution Diagnostic to Complement (s)SFR-M∗ Diagrams
Ellison, Sara L.; Faber, S. M.; Tacchella, Sandro +3 more
The specific star formation rate (sSFR) is commonly used to describe the level of galaxy star formation (SF) and to select quenched galaxies. However, since it is a relative measure of the young-to-old population, an ambiguity in its interpretation may arise because a low sSFR can be due to either a substantial previous mass buildup or SF activity…
Scrutiny of a very young, metal-poor star-forming Lyα emitter at z ≈ 3.7
Rodighiero, G.; Zanella, A.; Vanzella, E. +9 more
The origin of the Lyman α (Lyα) emission in galaxies is a long-standing issue: despite several processes known to originate this line (e.g. active galactic nucleus, star formation, cold accretion, shock heating), it is difficult to discriminate among these phenomena based on observations. Recent studies have suggested that the comparison of the ul…
M giants with IGRINS. I. Stellar parameters and α-abundance trends of the solar neighborhood population
Ryde, N.; Casagrande, L.; Nandakumar, G. +1 more
Context. Cool stars, such as M giants, can only be analyzed in the near-infrared (NIR) regime due to the ubiquitous titanium oxide features in optical spectra of stars with Teff < 4000 K. In dust-obscured regions, the inner bulge and Galactic center region, the intrinsically bright M giants observed in the NIR are an optimal option f…
The Panchromatic Hubble Andromeda Treasury. XX. The Disk of M31 is Thick
Bell, Eric F.; Dolphin, Andrew E.; Williams, Benjamin F. +6 more
We present a new approach to measuring the thickness of a partially face-on stellar disk, using dust geometry. In a moderately-inclined disk galaxy, the fraction of reddened stars is expected to be 50% everywhere, assuming that dust lies in a thin midplane. In a thickened disk, however, a wide range of radii project onto the line of sight. Assumin…
Evidence for Low-power Radio Jet-ISM Interaction at 10 pc in the Dwarf AGN Host NGC 4395
Stalin, C. S.; Riffel, Rogemar A.; Nandi, Payel +10 more
Black-hole-driven outflows in galaxies hosting active galactic nuclei (AGN) may interact with their interstellar medium (ISM) affecting star formation (SF). Such feedback processes, reminiscent of those seen in massive galaxies, have been reported recently in some dwarf galaxies. However, such studies have usually been on kiloparsec and larger sca…
The bright blue side of the night sky: Spectroscopic survey of bright and hot (pre-) white dwarfs
Kepler, S. O.; Uzundag, Murat; Pelisoli, Ingrid +10 more
We report on the spectroscopic confirmation of 68 new bright (G = 13.5-17.2 mag) and blue (pre-)white dwarfs (WDs). This finding has allowed us to almost double the number of the hottest (Teff ≥ 60 kK) known WDs brighter than G = 16 mag. We increased the number of known ultra-high excitation (UHE) WDs by 20%, found one unambiguous close…
Mapping the distribution of OB stars and associations in Auriga
Quintana, Alexis L.; Wright, Nicholas J.; Jeffries, Robin D.
OB associations are important probes of recent star formation and Galactic structure. In this study, we focus on the Auriga constellation, an important region of star formation due to its numerous young stars, star-forming regions, and open clusters. We show using Gaia data that its two previously documented OB associations, Aur OB1 and OB2, are t…