output
19912026
Showing 2018 · astro-ph.HEShow all

61 papers · 2 filters

astro-ph.HE2018★ 9 cited

Wobbly Dark Matter Signals at Cherenkov Telescopes from Long Lived Mediator Decays

Stefania Gori, Stefano Profumo, Bibhushan Shakya

Imaging Atmospheric Cherenkov Telescope (IACT) searches for dark matter often perform observations in "wobble mode", i.e. collecting data from the signal region and from a correspo…

astro-ph.HE2018★ 40 cited

Nebular Spectroscopy of Kepler's Brightest Supernova

G. Dimitriadis, C. Rojas-Bravo, C. D. Kilpatrick +9

We present late-time (240-260 days after peak brightness) optical photometry and nebular (+236 and +264 days) spectroscopy of SN 2018oh, the brightest Type Ia supernova (SN I…

astro-ph.HE2018★ 4 cited

Target of Opportunity Observations of Gravitational Wave Events with LSST

R. Margutti, P. Cowperthwaite, Z. Doctor +79

The discovery of the electromagnetic counterparts to the binary neutron star merger GW170817 has opened the era of GW+EM multi-messenger astronomy. Exploiting this breakthrough req…

astro-ph.HE2018★ 72 cited

Observatory science with eXTP

Jean J. M. in 't Zand, Enrico Bozzo, Jinlu Qu +181

In this White Paper we present the potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission for studies related to Observatory Science targets. These include flaring s…

astro-ph.HE2018★ 41 cited

Tidal Disruptions of Stars by Binary Black Holes: Modifying the Spin Magnitudes and Directions of LIGO Sources in Dense Stellar Environments

Martin Lopez, Aldo Batta, Enrico Ramirez-Ruiz +2

Binary black holes (BBHs) appear to be widespread and are able to merge through the emission of gravitational waves, as recently illustrated by LIGO. The spin of the BBHs is one of…

astro-ph.HE2018★ 173 cited

A -ray determination of the Universe's star-formation history

LAT Collaboration, M. Ajello, K. Helgason +4

The light emitted by all galaxies over the history of the Universe produces the extragalactic background light (EBL) at ultraviolet, optical, and infrared wavelengths. The EBL is a…

astro-ph.HE2018★ 25 cited

Detection of Circumstellar Helium in Type Iax Progenitor Systems

Wynn Jacobson-Galan, Ryan Foley, Josiah Schwab +6

We present direct spectroscopic modeling of 44 Type Iax supernovae (SNe Iax) using spectral synthesis code SYNAPPS. We confirm detections of helium emission in the early-time spect…

astro-ph.HE2018★ 45 cited

Three-dimensional mixing and light curves: constraints on the progenitor of supernova 1987A

Victor Utrobin, Annop Wongwathanarat, H. -Thomas Janka +3

With the same method as used previously, we investigate neutrino-driven explosions of a larger sample of blue supergiant models. The larger sample includes three new presupernova s…

astro-ph.HE2018★ 105 cited

Superluminous Supernovae from the Dark Energy Survey

C. R. Angus, M. Smith, M. Sullivan +72

We present a sample of 21 hydrogen-free superluminous supernovae (SLSNe-I), and one hydrogen-rich SLSN (SLSN-II) detected during the five-year Dark Energy Survey (DES). These SNe,…

astro-ph.HE2018★ 21 cited

A Search for Optical Emission from Binary-Black-Hole Merger GW170814 with the Dark Energy Camera

Z. Doctor, R. Kessler, K. Herner +96

Binary black hole (BBH) mergers found by the LIGO and Virgo detectors are of immense scientific interest to the astrophysics community, but are considered unlikely to be sources of…

astro-ph.HE2018★ 106 cited

K2 Observations of SN 2018oh Reveal a Two-Component Rising Light Curve for a Type Ia Supernova

G. Dimitriadis, R. J. Foley, A. Rest +145

We present an exquisite, 30-min cadence Kepler (K2) light curve of the Type Ia supernova (SN Ia) 2018oh (ASASSN-18bt), starting weeks before explosion, covering the moment of explo…

astro-ph.HE2018★ 49 cited

The ASAS-SN Bright Supernova Catalog -- IV. 2017

T. W. -S. Holoien, J. S. Brown, P. J. Vallely +41

In this catalog we compile information for all supernovae discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN) as well as all other bright (), spectr…

astro-ph.HE2018★ 83 cited

A luminosity distribution for kilonovae based on short gamma-ray burst afterglows

Stefano Ascenzi, Michael W. Coughlin, Tim Dietrich +8

The combined detection of a gravitational-wave signal, kilonova, and short gamma-ray burst (sGRB) from GW170817 marked a scientific breakthrough in the field of multi-messenger ast…

astro-ph.HE2018★ 71 cited

Periastron Observations of TeV Gamma-Ray Emission from a Binary System with a 50-year Period

The VERITAS Collaboration, A. U. Abeysekara, W. Benbow +212

We report on observations of the pulsar / Be star binary system PSR J2032+4127 / MT91 213 in the energy range between 100 GeV and 20 TeV with the VERITAS and MAGIC imaging atmosphe…

astro-ph.HE2018★ 60 cited

A search for the host galaxy of FRB171020

Elizabeth K. Mahony, Ron D. Ekers, Jean-Pierre Macquart +11

We report on a search for the host galaxy of FRB171020, the fast radio burst with the smallest recorded dispersion measure (DM pc cm) of our on-ongoing ASKAP survey.…

astro-ph.HE2018★ 153 cited

Very high energy particle acceleration powered by the jets of the microquasar SS 433

HAWC Collaboration, A. U. Abeysekara, A. Albert +104

SS 433 is a binary system containing a supergiant star that is overflowing its Roche lobe with matter accreting onto a compact object (either a black hole or neutron star). Two jet…

astro-ph.HE2018★ 50 cited

r-process enrichment of ultra-faint dwarf galaxies by fast merging double neutron stars

Mohammadtaher Safarzadeh, Enrico Ramirez-Ruiz, Jeff. J. Andrews +3

The recent aLIGO/aVirgo discovery of gravitational waves from the neutron star merger (NSM) GW170817 and the follow up kilonova observations have shown that NSMs produce copious am…

astro-ph.HE2018★ 258 cited

Eccentric Black Hole Mergers in Dense Star Clusters: The Role of Binary-Binary Encounters

Michael Zevin, Johan Samsing, Carl Rodriguez +2

We present the first systematic study of strong binary-single and binary-binary black hole interactions with the inclusion of general relativity. When including general relativisti…

astro-ph.HE2018★ 39 cited

VERITAS and Fermi-LAT observations of new HAWC sources

VERITAS Collaboration, A. U. Abeysekara, A. Archer +280

The HAWC (High Altitude Water Cherenkov) collaboration recently published their 2HWC catalog, listing 39 very high energy (VHE; >100~GeV) gamma-ray sources based on 507 days of obs…

astro-ph.HE2018★ 60 cited

Measurement of Cosmic-ray Electrons at TeV Energies by VERITAS

VERITAS Collaboration, A. Archer, W. Benbow +58

Cosmic-ray electrons and positrons (CREs) at GeV-TeV energies are a unique probe of our local Galactic neighborhood. CREs lose energy rapidly via synchrotron radiation and inverse-…

astro-ph.HE2018★ 53 cited

First ALMA Light Curve Constrains Refreshed Reverse Shocks and Jet Magnetization in GRB 161219B

Tanmoy Laskar, Kate D. Alexander, Edo Berger +13

We present detailed multi-wavelength observations of GRB 161219B at , spanning the radio to X-ray regimes, and the first ALMA light curve of a GRB afterglow. The cm- and…

astro-ph.HE2018★ 2 cited

A UV Resonance Line Echo from a Shell Around a Hydrogen-Poor Superluminous Supernova

R. Lunnan, C. Fransson, P. M. Vreeswijk +21

Hydrogen-poor superluminous supernovae (SLSN-I) are a class of rare and energetic explosions discovered in untargeted transient surveys in the past decade. The progenitor stars and…

astro-ph.HE2018★ 84 cited

The extreme HBL behaviour of Markarian 501 during 2012

M. L. Ahnen, S. Ansoldi, L. A. Antonelli +276

A multiwavelength campaign was organized to take place between March and July of 2012. Excellent temporal coverage was obtained with more than 25 instruments, including the MAGIC,…

astro-ph.HE2018★ 8 cited

The two tails of PSR J2055+2539 as seen by Chandra: analysis of the nebular morphology and pulsar proper motion

Martino Marelli, Andrea Tiengo, Andrea De Luca +4

We analyzed two Chandra observations of PSR J2055+2539 (for a total integration time of 130 ks) in order to measure its proper motion and study its two elongated nebular feat…