Search Publications
Dense Molecular Gas Tracers in the Outflow of the Starburst Galaxy NGC 253
Meier, David S.; Ott, Jürgen; Warren, Steven R. +12 more
We present a detailed study of a molecular outflow feature in the nearby starburst galaxy NGC 253 using ALMA. We find that this feature is clearly associated with the edge of NGC 253's prominent ionized outflow, has a projected length of ∼300 pc, with a width of ∼50 pc, and a velocity dispersion of ∼40 km s-1, which is consistent with a…
The AMBRE project: chemical evolution models for the Milky Way thick and thin discs
Recio-Blanco, A.; de Laverny, P.; Hayden, M. +5 more
We study the chemical evolution of the thick and thin discs of the Galaxy by comparing detailed chemical evolution models with recent data from the Archéologie avec Matisse Basée sur les aRchives de l'ESO project. The data suggest that the stars in the thick and thin discs form two distinct sequences with the thick disc stars showing higher [α/Fe]…
Neutrino lines from majoron dark matter
Garcia-Cely, Camilo; Heeck, Julian
Models with spontaneously broken global lepton number can lead to a pseudo-Goldstone boson as a long-lived dark matter candidate. Here we revisit the case of singlet majoron dark matter and discuss multiple constraints. For masses above MeV, this model could lead to a detectable flux of monochromatic mass-eigenstate neutrinos, which have flavor ra…
An ALMA Survey of DCN/H13CN and DCO+/H13CO+ in Protoplanetary Disks
Wilner, David J.; Aikawa, Yuri; Andrews, Sean M. +7 more
The deuterium enrichment of molecules is sensitive to their formation environment. Constraining patterns of deuterium chemistry in protoplanetary disks is therefore useful for probing how material is inherited or reprocessed throughout the stages of star and planet formation. We present ALMA observations at ∼0.″6 resolution of DCO+, H
X-ray and Ultraviolet Properties of AGNs in Nearby Dwarf Galaxies
Greene, Jenny E.; Baldassare, Vivienne F.; Reines, Amy E. +1 more
We present new Chandra X-ray Observatory and Hubble Space Telescope observations of eight optically selected broad-line active galactic nucleus (AGN) candidates in nearby dwarf galaxies (z < 0.055). Including archival Chandra observations of three additional sources, our sample contains all 10 galaxies from Reines et al. (2013) with both broad …
Lens modelling Abell 370: crowning the final frontier field with MUSE
Mahler, Guillaume; Richard, Johan; Schmidt, Kasper B. +8 more
We present a strong lensing analysis on the massive cluster Abell 370 (A370; z = 0.375), using a combination of deep multiband Hubble Space Telescope (HST) imaging and Multi-Unit Spectroscopic Explorer (MUSE) spectroscopy. From only 2 h of the MUSE data, we are able to measure 120 redshifts in the southern BCG area, including several multiply imag…
Probing dark matter substructure in the gravitational lens HE 0435-1223 with the WFC3 grism
Keeton, C. R.; Kochanek, C. S.; Brammer, G. +7 more
Strong gravitational lensing provides a powerful test of cold dark matter (CDM) as it enables the detection and mass measurement of low-mass haloes even if they do not contain baryons. Compact lensed sources such as active galactic nuclei (AGNs) are particularly sensitive to perturbing subhaloes, but their use as a test of CDM has been limited by …
ALMA Reveals Metals yet No Dust within Multiple Components in CR7
Schaerer, D.; Mobasher, B.; Ferrara, A. +8 more
We present spectroscopic follow-up observations of CR7 with ALMA, targeted at constraining the infrared (IR) continuum and [C II]{}158µ {{m}} line-emission at high spatial resolution matched to the HST/WFC3 imaging. CR7 is a luminous Lyα emitting galaxy at z = 6.6 that consists of three separated UV-continuum components. Our obser…
Bombs and Flares at the Surface and Lower Atmosphere of the Sun
Leenaarts, J.; Hansteen, V. H.; Rouppe van der Voort, L. +3 more
A spectacular manifestation of solar activity is the appearance of transient brightenings in the far wings of the Hα line, known as Ellerman bombs (EBs). Recent observations obtained by the Interface Region Imaging Spectrograph have revealed another type of plasma “bombs” (UV bursts) with high temperatures of perhaps up to 8 × 104 K wit…
Falling Outer Rotation Curves of Star-forming Galaxies at 0.6 ≲ z ≲ 2.6 Probed with KMOS3D and SINS/zC-SINF
Übler, Hannah; van Dokkum, Pieter G.; Brammer, Gabe +25 more
We exploit the deep, resolved, Hα kinematic data from the KMOS3D and SINS/zC-SINF surveys to examine the largely unexplored outer-disk kinematics of star-forming galaxies (SFGs), out to the peak of cosmic star formation. Our sample contains 101 SFGs, representative of the more massive (9.3≲ {log}{M}* /{M}⊙ ≲ 11.5) …