Search Publications
NOEMA redshift measurements of bright Herschel galaxies
Berta, S.; Omont, A.; Lagache, G. +31 more
Using the IRAM NOrthern Extended Millimeter Array (NOEMA), we conducted a program to measure redshifts for 13 bright galaxies detected in the Herschel Astrophysical Large Area Survey with S500 µm ≥ 80 mJy. We report reliable spectroscopic redshifts for 12 individual sources, which are derived from scans of the 3 and 2 mm bands, co…
The Breakthrough Listen Search for Intelligent Life: A 3.95-8.00 GHz Search for Radio Technosignatures in the Restricted Earth Transit Zone
Kalas, Paul; Gajjar, Vishal; Isaacson, Howard +5 more
We report on a search for artificial narrowband signals of 20 stars within the restricted Earth Transit Zone (rETZ) as a part of the ten-year Breakthrough Listen (BL) search for extraterrestrial intelligence (ETI). The rETZ is the region of the sky from which an observer would see Earth transit the Sun with an impact parameter of less than 0.5. Th…
NuSTAR/XMM-Newton monitoring of the Seyfert 1 galaxy HE 1143-1810. Testing the two-corona scenario
Bianchi, S.; Cappi, M.; Ponti, G. +11 more
Aims: We test the two-corona accretion scenario for active galactic nuclei in the case of the "bare" Seyfert 1 galaxy HE 1143-1810.
Methods: We perform a detailed study of the broad-band UV-X-ray spectral properties and of the short-term variability of HE 1143-1810. We present results of a joint XMM-Newton and NuSTAR monitoring of the so…
Monitoring of the radio galaxy M 87 during a low-emission state from 2012 to 2015 with MAGIC
Maraschi, L.; Covino, S.; Antonelli, L. A. +186 more
M 87 is one of the closest (z = 0.004 36) extragalactic sources emitting at very high energies (VHE, E > 100 GeV). The aim of this work is to locate the region of the VHE gamma-ray emission and to describe the observed broad-band spectral energy distribution (SED) during the low VHE gamma-ray state. The data from M 87 collected between 2012 and…
The Fornax 3D project: Non-linear colour-metallicity relation of globular clusters
Viaene, S.; Hilker, M.; Pinna, F. +15 more
Globular cluster (GC) systems of massive galaxies often show a bimodal colour distribution. This has been interpreted as a metallicity bimodality, created by a two-stage galaxy formation where the red, metal-rich GCs were formed in the parent halo and the blue metal-poor GCs were accreted. This interpretation, however, crucially depends on the ass…
Origins of Type Ibn SNe 2006jc/2015G in interacting binaries and implications for pre-SN eruptions
Sun, Ning-Chen; Crowther, Paul A.; Podsiadlowski, Philipp +2 more
Type Ibn supernovae (SNe Ibn) are intriguing stellar explosions whose spectra exhibit narrow helium lines with little hydrogen. They trace the presence of circumstellar material (CSM) formed via pre-SN eruptions of their stripped-envelope progenitors. Early work has generally assumed that SNe Ibn come from massive Wolf-Rayet (WR) stars via single-…
A Catalog of M-dwarf Flares with ASAS-SN
Holoien, Thomas W. -S.; Auchettl, Katie; Kochanek, Christopher S. +5 more
We analyzed the light curves of 1376 early-to-late, nearby M dwarfs to search for white-light flares using photometry from the All-Sky Automated Survey for Supernovae. We identified 480 M dwarfs with at least one potential flare employing a simple statistical algorithm that searches for sudden increases in V-band flux. After more detailed evaluati…
First direct observation of a torsional Alfvén oscillation at coronal heights
Kohutova, P.; Verwichte, E.; Froment, C.
Context. Torsional Alfvén waves are promising candidates for the transport of energy across different layers of the solar atmosphere. They have been predicted theoretically for decades. Previous detections of Alfvén waves so far have however mostly relied on indirect signatures.
Aims: We present the first direct observational evidence of a fu…
Dissecting the Phase Space Snail Shell
Shen, Juntai; Li, Zhao-Yu
The ongoing vertical phase-mixing, manifesting itself as a snail shell in the $Z-{V}_{Z}$ phase space, has been discovered with Gaia DR2 data. To better understand the origin and properties of the phase-mixing process, we study the vertical phase-mixing signatures in arches (including the classical "moving groups") of the ${V}_{R}-{V}_{\phi }$ pha…
AstroSat detection of Lyman continuum emission from a z = 1.42 galaxy
Verhamme, Anne; Inoue, Akio K.; Schaerer, Daniel +10 more
One of the outstanding problems of current observational cosmology is to understand the nature of sources that produced the bulk of the ionizing radiation after the Cosmic Dark Age. Direct detection of these reionization sources1 is practically infeasible at high redshift (z) due to the steep decline of intergalactic medium transmission…