Search Publications
Similarities and uniqueness of Ly α emitters among star-forming galaxies at z = 2.5
Shibuya, Takatoshi; Suzuki, Tomoko L.; Koyama, Yusei +8 more
We conducted a deep narrow-band imaging survey with the Subaru Prime Focus Camera on the Subaru Telescope and constructed a sample of Lyα emitters (LAEs) at z = 2.53 in the UDS-CANDELS field, where a sample of Hα emitters (HAEs) at the same redshift is already obtained from our previous narrow-band observation at near-infrared. The deep narrow-ban…
Small electron acceleration episodes in the solar corona
James, Tomin; Subramanian, Prasad; Kontar, Eduard P.
We study the energetics of non-thermal electrons produced in small acceleration episodes in the solar corona. We carried out an extensive survey spanning 2004-2015 and shortlisted six impulsive electron events detected at 1 au that were not associated with large solar flares (GOES soft X-ray class > C1) or with coronal mass ejections. Each of t…
Optical properties of cometary particles collected by the COSIMA mass spectrometer on-board Rosetta during the rendezvous phase around comet 67P/Churyumov-Gerasimenko
Langevin, Y.; Schulz, R.; Hilchenbach, M. +7 more
40 000 collected cometary particles have been identified on the 21 targets exposed by the COSIMA experiment on-board Rosetta to the environment of comet 67P/Churyumov-Gerasimenko from 2014 August to 2016 September. The images of the targets where obtained by the COSIMA microscope (Cosiscope, 13.95 µm pixel-1) with near grazing inc…
Tracing the origin of the AGN fuelling reservoir in MCG-6-30-15
Fabian, A. C.; Gandhi, P.; Celotti, A. +3 more
The active galaxy MCG-6-30-15 has a 400 pc diameter stellar kinematically distinct core, counter-rotating with respect to the main body of the galaxy. Our previous high spatial resolution (0.1 arcsec) H-band observations of this galaxy mapped the stellar kinematics and [Fe II] 1.64 µm gas dynamics though mainly restricted to the spatial regi…
Discovery of a radio relic in the low mass, merging galaxy cluster PLCK G200.9-28.2
Wik, Daniel R.; Giacintucci, Simona; Venturi, Tiziana +5 more
Radio relics at the peripheries of galaxy clusters are tracers of the elusive cluster merger shocks. We report the discovery of a single radio relic in the galaxy cluster PLCK G200.9-28.2 (z = 0.22, M500 = 2.7 ± 0.2 × 1014 M⊙) using the Giant Metrewave Radio Telescope at 235 and 610 MHz and the Karl G. Jansky Very …
New ALMA constraints on the star-forming interstellar medium at low metallicity: a 50 pc view of the blue compact dwarf galaxy SBS 0335-052
Lebouteiller, V.; Madden, S. C.; Galliano, F. +8 more
Properties of the cold interstellar medium of low-metallicity galaxies are not well known due to the faintness and extremely small scale on which emission is expected. We present deep ALMA band 6 (230 GHz) observations of the nearby, low-metallicity (12 + log (O/H) = 7.25) blue compact dwarf galaxy SBS 0335-052 at an unprecedented resolution of 0.…
Redshift remapping and cosmic acceleration in dark-matter-dominated cosmological models
Prada, Francisco; Wojtak, Radosław
The standard relation between the cosmological redshift and cosmic scalefactor underlies cosmological inference from virtually all kinds of cosmological observations, leading to the emergence of the Λ cold-dark-matter (ΛCDM) cosmological model. This relation is not a fundamental theory and thus observational determination of this function (redshif…
The complex, dusty narrow-line region of NGC 4388: gas-jet interactions, outflows and extinction revealed by near-IR spectroscopy
Colina, L.; Ho, L. C.; Winge, C. +14 more
We present Gemini/GNIRS (Gemini Near-Infrared Spectrograph) spectroscopy of the Seyfert 2 galaxy NGC 4388, with simultaneous coverage from 0.85 to 2.5 µm. Several spatially extended emission lines are detected for the first time, both in the obscured and unobscured portion of the optical narrow-line region (NLR), allowing us to assess the co…
Looking for dark matter trails in colliding galaxy clusters
Massey, Richard; Kneib, Jean-Paul; Harvey, David +1 more
If dark matter interacts, even weakly, via non-gravitational forces, simulations predict that it will be preferentially scattered towards the trailing edge of the halo during collisions between galaxy clusters. This will temporarily create a non-symmetric mass profile, with a trailing overdensity along the direction of motion. To test this hypothe…
A very dark stellar system lost in Virgo: kinematics and metallicity of SECCO 1 with MUSE
Bellazzini, M.; Testa, V.; Beccari, G. +11 more
We present the results of VLT-MUSE (Very Large Telescope-Multi Unit Spectroscopic Explorer) integral field spectroscopy of SECCO 1, a faint, star-forming stellar system recently discovered as the stellar counterpart of an ultracompact high-velocity cloud (HVC 274.68+74.0), very likely residing within a substructure of the Virgo cluster of galaxies…