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A low-mass triple system with a wide L/T transition brown dwarf component: NLTT 51469AB/SDSS 2131-0119
Rebolo, R.; Béjar, V. J. S.; Zapatero Osorio, M. R. +6 more
We demonstrate that the previously identified L/T transition brown dwarf SDSS J213154.43-011939.3 (SDSS 2131-0119) is a widely separated (82{^''.}3, ∼3830 au) common proper motion companion to the low-mass star NLTT 51469, which we reveal to be a close binary itself, separated by 0{^''.}64 ± 0{^''.}01 (∼30 au). We …
A radio structure resolved at the deca-parsec scale in the radio-quiet quasar PDS 456 with an extremely powerful X-ray outflow
Zhang, Zhongli; Paragi, Zsolt; Yang, Jun +5 more
Active galactic nuclei (AGNs) accreting at rates close to the Eddington limit can host radiatively driven mildly relativistic outflows. Some of these X-ray absorbing but powerful outflows can produce strong shocks, resulting in a significant non-thermal emission. This outflow-driven radio emission might be detectable in the radio-quiet quasar PDS …
Optical integral field spectroscopy of intermediate redshift infrared bright galaxies
Magdis, G. E.; Farrah, D.; Rigopoulou, D. +10 more
The extreme infrared (IR) luminosity of local luminous and ultraluminous IR galaxies (U/LIRGs; 11 < log L_IR / L_⊙ < 12 and log L_IR / L_⊙ > 12, respectively) is mainly powered by star formation processes triggered by mergers or interactions. While U/LIRGs are rare locally, at z > 1, they become more common, dominate the star formation…
Nature of blackbody stars
Serenelli, Aldo; Rohrmann, René D.; Fukugita, Masataka
A selection of 17 stars in the Sloan Digital Sky Survey, previously identified as DC-class white dwarfs (WDs), has been reported to show spectra very close to blackbody radiation in the wavelength range from ultraviolet to infrared. Because of the absence of lines and other details in their spectra, the surface gravity of these objects has previou…
ISPY - NaCo Imaging Survey for Planets around Young stars. A young companion candidate embedded in the R CrA cloud
Quanz, S. P.; Quirrenbach, A.; Henning, T. +13 more
Context. Within the NaCo-ISPY exoplanet imaging program, we aim at detecting and characterizing the population of low-mass companions at wide separations (≳10 AU), focusing in particular on young stars either hosting a known protoplanetary disk or a debris disk.
Aims: R CrA is one of the youngest (1-3 Myr) and most promising objects in our sa…
The analysis of effective galaxies number count for Chinese Space Station Optical Survey (CSS-OS) by image simulation
Zhang, Xin; Meng, Xianmin; Cao, Li
The Chinese Space Station Optical Survey (CSS-OS) is a mission to explore the vast universe. This mission will equip a 2-meter space telescope to perform a multi-band NUV-optical large area survey (over 40
Effect of low anisotropy on cosmological models by using supernova data
Hossienkhani, H.; Yousefi, H.; Azimi, N.
By using the supernovae type Ia (SNIa) data we study influence of the anisotropy (although low) on the evolution of the universe and compare ΛCDM model with 6 representative parametrizations of the recent Hubble expansion history H(z). To compare these models we use the maximum likelihood method for find that the best fit dynamical w(z) and q(z) o…
The Cluster-forming Site AFGL 5157: Colliding Filamentary Clouds and Star Formation
Dewangan, L. K.
We observationally investigate star formation process occurring in AFGL 5157 (area ∼13.5 pc × 13.5 pc) using a multi-wavelength approach. Embedded filaments are seen in the Herschel column density map, and one of them is identified as an elongated filamentary feature (FF) (length ∼8.3 pc; mass ∼1170 M ⊙). Five Herschel clumps (M cl…
Jovian Cosmic-Ray Protons in the Heliosphere: Constraints by Cassini Observations
Krupp, Norbert; Krimigis, Stamatios M.; Mitchell, Donald G. +5 more
Measurements of >82 MeV Galactic cosmic-ray (GCR) protons at Earth indicate that they may be mixed with protons that leak into the heliosphere from Jupiter’s magnetosphere (Jovian cosmic-ray protons (JCRPs)). A ∼400 day periodicity in these proton fluxes, which is similar to the synodic period between Jupiter and Earth, and an excess proton flu…
Accretion disc by Roche lobe overflow in the supergiant fast X-ray transient IGR J08408-4503
Santangelo, A.; Ducci, L.; Romano, P. +1 more
Supergiant fast X-ray transients (SFXTs) are X-ray binary systems with a supergiant companion and likely a neutron star, which show a fast (∼103 s) and high variability with a dynamic range up to 105-6. Given their extreme properties, they are considered among the most valuable laboratories to test accretion models. Recently,…