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First HETDEX Spectroscopic Determinations of Lyα and UV Luminosity Functions at z = 2-3: Bridging a Gap between Faint AGNs and Bright Galaxies
Ono, Yoshiaki; Ouchi, Masami; Finkelstein, Steven L. +21 more
We present Lyα and ultraviolet (UV)-continuum luminosity functions (LFs) of galaxies and active galactic nuclei (AGNs) at z = 2.0-3.5 determined by the untargeted optical spectroscopic survey of the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). We combine deep Subaru imaging with HETDEX spectra resulting in 11.4 deg2 of fiber …
Constraints on MeV dark matter and primordial black holes: Inverse Compton signals at the SKA
Kar, Arpan; Dutta, Bhaskar; Strigari, Louis E.
We investigate the possibilities for probing MeV dark matter (DM) particles and primordial black holes (PBHs) (for masses ~ 1015-1017 g) at the upcoming radio telescope SKA, using photon signals from the Inverse Compton (IC) effect within a galactic halo. Pair-annihilation or decay of MeV DM particles (into e+ e
BepiColombo Science Investigations During Cruise and Flybys at the Earth, Venus and Mercury
Fränz, Markus; Barabash, Stas; Krüger, Harald +59 more
The dual spacecraft mission BepiColombo is the first joint mission between the European Space Agency (ESA) and the Japanese Aerospace Exploration Agency (JAXA) to explore the planet Mercury. BepiColombo was launched from Kourou (French Guiana) on October 20th, 2018, in its packed configuration including two spacecraft, a transfer module, and a sun…
The GOGREEN survey: transition galaxies and the evolution of environmental quenching
Cooper, M. C.; Muzzin, Adam; Forrest, Ben +25 more
We measure the rate of environmentally driven star formation quenching in galaxies at z ~ 1, using eleven massive ($M\approx 2\times 10^{14}\, \mathrm{M}_\odot$) galaxy clusters spanning a redshift range 1.0 < z < 1.4 from the GOGREEN sample. We identify three different types of transition galaxies: 'green valley' (GV) galaxies identified fr…
Toward Precision Cosmology with Improved PNLF Distances Using VLT-MUSEI. Methodology and Tests
Weilbacher, Peter M.; Roth, Martin M.; Ciardullo, Robin +3 more
The [O III] λ5007 planetary nebula luminosity function (PNLF) is an established distance indicator that has been used for more than 30 yr to measure the distances of galaxies out to ~15 Mpc. With the advent of the Multi-Unit Spectroscopic Explorer on the Very Large Telescope (MUSE) as an efficient wide-field integral-field spectrograph, the PNLF m…
A multiband map of the natural night sky brightness including Gaia and Hipparcos integrated starlight
Masana, Eduard; Carrasco, Josep Manel; Bará, Salvador +1 more
The natural night sky brightness is a relevant input for monitoring the light pollution evolution at observatory sites, by subtracting it from the overall sky brightness determined by direct measurements. It is also instrumental for assessing the expected darkness of the pristine night skies. The natural brightness of the night sky is determined b…
Indications for very high metallicity and absence of methane in the eccentric exo-Saturn WASP-117b
Henning, Thomas; Jordán, Andrés; Apai, Dániel +12 more
Aims: We investigate the atmospheric composition of the long-period (Porb = 10 days) eccentric exo-Saturn WASP-117b. WASP-117b could be similar in atmospheric temperature and chemistry to WASP-107b. In mass and radius, WASP-117b is similar to WASP-39b, which allows a comparative study of these planets.
Methods: We analyzed a n…
The delay time distribution of Type-Ia supernovae in galaxy clusters: the impact of extended star-formation histories
Maoz, Dan; Freundlich, Jonathan
The delay time distribution (DTD) of Type-Ia supernovae (SNe Ia) is important for understanding chemical evolution, SN Ia progenitors, and SN Ia physics. Past estimates of the DTD in galaxy clusters have been deduced from SN Ia rates measured in cluster samples observed at various redshifts, corresponding to different time intervals after a presum…
Optimising and comparing source-extraction tools using objective segmentation quality criteria
Venhola, Aku; Peletier, Reynier; Chamba, Nushkia +4 more
Context. With the growth of the scale, depth, and resolution of astronomical imaging surveys, there is increased need for highly accurate automated detection and extraction of astronomical sources from images. This also means there is a need for objective quality criteria, and automated methods to optimise parameter settings for these software too…
Three K2 Campaigns Yield Rotation Periods for 1013 Stars in Praesepe
Cargile, Phillip A.; Rampalli, Rayna; Law, Nicholas M. +8 more
We use three campaigns of K2 observations to complete the census of rotation in low-mass members of the benchmark, ≈670 Myr old open cluster Praesepe. We measure new rotation periods (P rot) for 220 ≲1.3 M ⊙ Praesepe members and recovery periods for 97% (793/812) of the stars with a P rot in the literature. Of the …