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ALMA reveals a pseudo-disc in a proto-brown dwarf
Riaz, B.; Stamatellos, D.; Machida, M. N.
We present the observational evidence of a pseudo-disc around the proto-brown dwarf Mayrit 1701117, the driving source of the large-scale HH 1165 jet. Our analysis is based on Atacama Large Millimeter/submillimeter Array 12CO (2-1) line and 1.37 mm continuum observations at an angular resolution of ∼0.4 arcsec. The pseudo-disc is a brig…
A Hard Look at NGC 5347: Revealing a Nearby Compton-thick AGN
Kaastra, J. S.; Stern, D.; Brandt, W. N. +11 more
Current measurements show that the observed fraction of Compton-thick (CT) active galactic nuclei (AGN) is smaller than the expected values needed to explain the cosmic X-ray background. Prior fits to the X-ray spectrum of the nearby Seyfert-2 galaxy NGC 5347 (z = 0.00792, D = 35.5 Mpc ) have alternately suggested a CT and Compton-thin source. Com…
Spitzer Catalog of Herschel-selected Ultrared Dusty Star-forming Galaxies
Serjeant, Stephen; Dunne, Loretta; Ashby, Matthew L. N. +24 more
The largest Herschel extragalactic surveys, H-ATLAS and HerMES, have selected a sample of “ultrared” dusty star-forming galaxies (DSFGs) with rising SPIRE flux densities (S 500 > S 350 > S 250; the so-called “500 µm risers”) as an efficient way for identifying DSFGs at higher redshift (z > 4). In thi…
A Dissection of Spatially Resolved AGN Feedback across the Electromagnetic Spectrum
Koss, Michael; Mushotzky, Richard; Crenshaw, D. Michael +7 more
We present optical SuperNova Integral Field Spectrograph integral field spectroscopy, Hubble Space Telescope optical imaging, Chandra X-ray imaging, and Very Large Array radio interferometry of the merging galaxy 2MASX J04234080+0408017, which hosts a Seyfert 2 active galactic nucleus (AGN) at z = 0.046. Our observations reveal that radiatively dr…
Imprints of the first billion years: Lyman limit systems at z ∼ 5
Worseck, Gábor; Prochaska, J. Xavier; Murphy, Michael T. +3 more
Lyman limit systems (LLSs) trace the low-density circumgalactic medium and the most dense regions of the intergalactic medium, so their number density and evolution at high-redshift, just after reionization, are important to constrain. We present a survey for LLSs at high redshifts, zLLS = 3.5-5.4, in the homogeneous data set of 153 opt…
The Implications of Local Fluctuations in the Galactic Midplane for Dynamical Analysis in the Gaia Era
Hogg, David W.; Laporte, Chervin F. P.; Ness, Melissa K. +6 more
Orbital properties of stars, computed from their six-dimensional phase-space measurements and an assumed Galactic potential, are used to understand the structure and evolution of the Galaxy. Stellar actions, computed from orbits, have the attractive quality of being invariant under certain assumptions and are therefore used as quantitative labels …
The Fornax 3D project: dust mix and gas properties in the centre of early-type galaxy FCC 167
Viaene, S.; Morelli, L.; Pinna, F. +15 more
Galaxies continuously reprocess their interstellar material. We can therefore expect changing dust grain properties in galaxies that have followed different evolutionary pathways. Determining the intrinsic dust grain mix of a galaxy helps in reconstructing its evolutionary history. Early-type galaxies occasionally display regular dust lanes in the…
3.8 µm Imaging of 400-600 K Brown Dwarfs and Orbital Constraints for WISEP J045853.90+643452.6AB
Apai, D.; Rieke, Marcia; Marley, Mark S. +10 more
Half of the energy emitted by late-T- and Y-type brown dwarfs emerges at 3.5 ≤ λ µm ≤ 5.5. We present new L‧ (3.43 ≤ λ µm ≤ 4.11) photometry obtained at the Gemini North telescope for nine late-T and Y dwarfs, and synthesize L‧ from spectra for an additional two dwarfs. The targets include two binary systems that were imaged at a resol…
The GALAH survey: co-orbiting stars and chemical tagging
Lewis, Geraint F.; Ting, Yuan-Sen; Casey, Andrew R. +24 more
We present a study using the second data release of the GALAH survey of stellar parameters and elemental abundances of 15 pairs of stars identified by Oh et al. They identified these pairs as potentially co-moving pairs using proper motions and parallaxes from Gaia DR1. We find that 11 very wide (>1 pc) pairs of stars do in fact have similar Ga…
A closer look at the deep radio sky: Multi-component radio sources at 3 GHz VLA-COSMOS
Bondi, M.; Finoguenov, A.; Magnelli, B. +20 more
Context. Given the unprecedented depth achieved in current large radio surveys, we are starting to probe populations of radio sources that have not been studied in the past. However, identifying and categorising these objects, differing in size, shape and physical properties, is becoming a more difficult task.
Aims: In this data paper we pres…