Search Results - "Astrophysical journal. Letters"
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First Sagittarius A Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
Published in Astrophysical journal. Letters (01-05-2022)“…Abstract We present the first Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A*), the Galactic center source associated with a supermassive…”
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Search for an Isotropic Gravitational-wave Background with the Parkes Pulsar Timing Array
Published in Astrophysical journal. Letters (01-07-2023)“…Abstract Pulsar timing arrays aim to detect nanohertz-frequency gravitational waves (GWs). A background of GWs modulates pulsar arrival times and manifests as…”
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Observation of Gravitational Waves from Two Neutron Star-Black Hole Coalescences
Published in Astrophysical journal. Letters (01-07-2021)“…We report the observation of gravitational waves from two compact binary coalescences in LIGO's and Virgo's third observing run with properties consistent with…”
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First Sagittarius A Event Horizon Telescope Results. VI. Testing the Black Hole Metric
Published in Astrophysical journal. Letters (01-05-2022)“…Abstract Astrophysical black holes are expected to be described by the Kerr metric. This is the only stationary, vacuum, axisymmetric metric, without…”
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Gravitational Waves and Gamma-Rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
Published in Astrophysical journal. Letters (20-10-2017)“…On 2017 August 17, the gravitational-wave event GW170817 was observed by the Advanced LIGO and Virgo detectors, and the gamma-ray burst (GRB) GRB 170817A was…”
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A Long Time Ago in a Galaxy Far, Far Away: A Candidate z ∼ 12 Galaxy in Early JWST CEERS Imaging
Published in Astrophysical journal. Letters (01-12-2022)“…Abstract We report the discovery of a candidate galaxy with a photo- z of z ∼ 12 in the first epoch of the James Webb Space Telescope (JWST) Cosmic Evolution…”
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First Sagittarius A Event Horizon Telescope Results. V. Testing Astrophysical Models of the Galactic Center Black Hole
Published in Astrophysical journal. Letters (01-05-2022)“…Abstract In this paper we provide a first physical interpretation for the Event Horizon Telescope's (EHT) 2017 observations of Sgr A*. Our main approach is to…”
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GW170608: Observation of a 19 Solar-mass Binary Black Hole Coalescence
Published in Astrophysical journal. Letters (20-12-2017)“…On 2017 June 8 at 02:01:16.49 UTC, a gravitational-wave (GW) signal from the merger of two stellar-mass black holes was observed by the two Advanced Laser…”
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The NANOGrav 15 yr Data Set: Evidence for a Gravitational-wave Background
Published in Astrophysical journal. Letters (01-07-2023)“…Abstract We report multiple lines of evidence for a stochastic signal that is correlated among 67 pulsars from the 15 yr pulsar timing data set collected by…”
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First Sagittarius A Event Horizon Telescope Results. III. Imaging of the Galactic Center Supermassive Black Hole
Published in Astrophysical journal. Letters (01-05-2022)“…Abstract We present the first event-horizon-scale images and spatiotemporal analysis of Sgr A* taken with the Event Horizon Telescope in 2017 April at a…”
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The NANOGrav 15 yr Data Set: Observations and Timing of 68 Millisecond Pulsars
Published in Astrophysical journal. Letters (01-07-2023)“…Abstract We present observations and timing analyses of 68 millisecond pulsars (MSPs) comprising the 15 yr data set of the North American Nanohertz Observatory…”
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CEERS Epoch 1 NIRCam Imaging: Reduction Methods and Simulations Enabling Early JWST Science Results
Published in Astrophysical journal. Letters (01-03-2023)“…Abstract We present the data release and data reduction process for the Epoch 1 NIRCam observations for the Cosmic Evolution Early Release Science Survey…”
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First Sagittarius A Event Horizon Telescope Results. II. EHT and Multiwavelength Observations, Data Processing, and Calibration
Published in Astrophysical journal. Letters (01-05-2022)“…Abstract We present Event Horizon Telescope (EHT) 1.3 mm measurements of the radio source located at the position of the supermassive black hole Sagittarius A*…”
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First Sagittarius A Event Horizon Telescope Results. IV. Variability, Morphology, and Black Hole Mass
Published in Astrophysical journal. Letters (01-05-2022)“…Abstract In this paper we quantify the temporal variability and image morphology of the horizon-scale emission from Sgr A*, as observed by the EHT in 2017…”
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CEERS Key Paper. I. An Early Look into the First 500 Myr of Galaxy Formation with JWST
Published in Astrophysical journal. Letters (01-03-2023)“…Abstract We present an investigation into the first 500 Myr of galaxy evolution from the Cosmic Evolution Early Release Science (CEERS) survey. CEERS, one of…”
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GW190814: Gravitational Waves from the Coalescence of a 23 Solar Mass Black Hole with a 2.6 Solar Mass Compact Object
Published in Astrophysical journal. Letters (01-06-2020)“…We report the observation of a compact binary coalescence involving a 22.2–24.3 M _⊙ black hole and a compact object with a mass of 2.50–2.67 M _⊙ (all…”
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Hidden Little Monsters: Spectroscopic Identification of Low-mass, Broad-line AGNs at z > 5 with CEERS
Published in Astrophysical journal. Letters (01-09-2023)“…Abstract We report on the discovery of two low-luminosity, broad-line active galactic nuclei (AGNs) at z > 5 identified using JWST NIRSpec spectroscopy from…”
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Astrophysical Implications of the Binary Black-Hole Merger GW150914
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The NANOGrav 15 yr Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational-wave Background
Published in Astrophysical journal. Letters (01-08-2023)“…Abstract The NANOGrav 15 yr data set shows evidence for the presence of a low-frequency gravitational-wave background (GWB). While many physical processes can…”
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Dusty Starbursts Masquerading as Ultra-high Redshift Galaxies in JWST CEERS Observations
Published in Astrophysical journal. Letters (01-02-2023)“…Abstract Lyman-break galaxy (LBG) candidates at z ≳ 10 are rapidly being identified in James Webb Space Telescope (JWST)/NIRCam observations. Due to the…”
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