30,025 datasets found

We present a microlensing analysis of updated light curves in three filters, the g-band, r-band, and H-band, for the gravitationally lensed quasars Q0957+561 and SBS0909+532....

We present a large sample of 2.5-38{mu}m galaxy spectra drawn from a cross-archival comparison in the AKARI-Spitzer Extragalactic Spectral Survey, and investigate a subset of...

Using the Zwicky Transient Facility alert stream, we are conducting a large spectroscopic campaign to construct a complete, volume-limited sample of transients brighter than...

We report the observational findings of the Sh2-112 HII region by using the multiwavelength data analysis ranging from optical to radio wavelengths. This region is powered by...

We present a new catalog of TeV gamma-ray sources using 1523 days of data from the High-Altitude Water Cherenkov (HAWC) Observatory. The catalog represents the most sensitive...

We report on the results of a new spectroscopic monitoring campaign of the quasar PG 0026+129 at the Calar Alto Observatory 2.2m telescope from 2017 July to 2020 February....

We report the results of reverberation mapping of three bright Seyfert galaxies, Mrk 79, NGC 3227, and Mrk 841, from a campaign conducted from 2016 December to 2017 May with the...

We present a high spatial resolution Chandra X-ray study of two infrared dark clouds (IRDCs), G034.43+00.24 and G035.39-00.33, which are expected to be in the early phases of...

We report on an optical photometric and polarimetric campaign on the accreting millisecond X-ray pulsar (AMXP) SAX J1808.4-3658 during its 2019 outburst. The emergence of a...

The classification of supernovae (SNe) and its impact on our understanding of explosion physics and progenitors have traditionally been based on the presence or absence of...

Automated classification of supernovae (SNe) based on optical photometric light-curve information is essential in the upcoming era of wide-field time domain surveys, such as the...

We present ZTF20aajnksq (AT 2020blt), a fast-fading ({Delta}r=2.3mag in {Delta}t=1.3d) red (g-r~0.6mag) and luminous (M_1626{AA}=-25.9mag) optical transient at z=2.9 discovered...

The microquasar Cygnus X-3 underwent a giant radio flare in 2017 April, reaching a maximum flux of ~16.5Jy at 8.5GHz. We present results from a long monitoring campaign carried...

We present our analysis of high-quality high-mass X-ray binary (HMXB) candidates in M31 selected from point-source optical counterpart candidates from the Chandra-PHAT survey...

In the nearby galaxy NGC4258, the well-modeled orbital motion of H_2_O masers about its supermassive black hole provides the means to measure a precise geometric distance. As a...

Multiple stellar populations (MPs) with different chemical compositions are not exclusive features of old globular clusters (older than 10Gyr). Indeed, recent studies reveal...

We present first results of a four-epoch VLBA survey for nonthermal emission toward all 556 compact radio sources previously identified in a deep VLA survey of the Orion Nebula...

From Very Long Baseline Array (VLBA) observations we previously identified a population of 123 young stellar systems with nonthermal radio emission toward the core of the Orion...

We present an investigation of the magnetic activity and flare characteristics of the subgiant stars mostly from F and G spectral types and compare the results with the...

Over the years, the flat-spectrum radio quasar 3C454.3 has presented phases of very high activity (flares) in which the different wave bands increase their flux dramatically. In...