We use Gemini GMOS-IFU observations of three luminous nearby Seyfert galaxies (Mrk 79, Mrk 348, and Mrk 607) to estimate the electron temperature (Te) fluctuations in the inner 0.4-1.1 kpc region of these galaxies. Based on Te determinations through the [O III]λ5007/λ4363 emission line ratio of each spaxel, temperature variations are quantified by
Electron temperature fluctuations in Seyfert galaxiesRiffel, Rogemar A. et al.92021
Visible-near-infrared observations of organics and carbonates on (101955) Bennu: Classification method and search for surface context
The OSIRIS-REx Visible and InfraRed Spectrometer (OVIRS) onboard the Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) spacecraft detected ~3.4-μm absorption features indicative of carbonates and organics on near-Earth asteroid (101955) Bennu. We apply a Kolmogorov-Smirnov similarity test toFerrone, S. M. et al.
Fecha de publicación:112021
Anisotropic satellite galaxy quenching modulated by black hole activity
The evolution of satellite galaxies is shaped by their constant interaction with the circumgalactic medium surrounding central galaxies, which in turn may be affected by gas and energy ejected from the central supermassive black hole1-6. The nature of such a coupling between black holes and galaxies is, however, much debated7-9 and observationalMartín-Navarro, Ignacio et al.
Fecha de publicación:02021
Exploring nine simultaneously occurring transients on April 12th 1950
Nine point sources appeared within half an hour on a region within ∼? 10 arcmin of a red-sensitive photographic plate taken in April 1950 as part of the historic Palomar Sky Survey. All nine sources are absent on both previous and later photographic images, and absent in modern surveys with CCD detectors which go several magnitudes deeper. WeVillarroel, Beatriz et al.
Fecha de publicación:02021
The plague of magnetic spots among the hot stars of globular clusters: a bridge between MS and WD stars
I will report on our recent discovery of a wide-spread photometric variability among hot (~20,000 – 30,000 K) extreme horizontal branch (EHB) stars in Galactic globular clusters. The EHB variability is periodic, displaying single-wave, low-amplitude and ~2-50 days modulations. The variability cannot be ascribed to either binary evolution orMomany, Y. et al.
Fecha de publicación:42021
Charting the Galactic Acceleration Field. I. A Search for Stellar Streams with Gaia DR2 and EDR3 with Follow-up from ESPaDOnS and UVES
We present maps of the stellar streams detected in the Gaia Data Release 2 (DR2) and Early Data Release 3 (EDR3) catalogs using the STREAMFINDER algorithm. We also report the spectroscopic follow-up of the brighter DR2 stream members obtained with the high-resolution CFHT/ESPaDOnS and VLT/UVES spectrographs as well as with the medium-resolution NTTIbata, Rodrigo et al.
Fecha de publicación:62021