Search Publications
Magnetar as the Central Engine of AT2018cow: Optical, Soft X-Ray, and Hard X-Ray Emission
Dai, Zi-Gao; Li, Long; Zhong, Shu-Qing +3 more
AT2018cow is the most extensively observed and widely studied fast blue optical transient to date; its unique observational properties challenge all existing standard models. In this paper, we model the luminosity evolution of the optical, soft X-ray, and hard X-ray emission, as well as the X-ray spectrum of AT2018cow with a magnetar-centered engi…
The Magnetic Field in the Colliding Filaments G202.3+2.5
Liu, Tie; Liu, Junhao; Lu, Xing +19 more
We observe the magnetic field morphology toward a nearby star-forming filamentary cloud, G202.3+2.5, using James Clerk Maxwell Telescope/POL-2 850 µm thermal dust polarization observations with an angular resolution of 14.″4 (∼0.053 pc). The average magnetic field orientation is found to be perpendicular to the filaments, while showing diffe…
The earliest phases of CNO enrichment in galaxies
Massari, D.; Mucciarelli, A.; Zamorani, G. +3 more
Context. The recent detection of super-solar carbon-to-oxygen and nitrogen-to-oxygen abundance ratios in a group of metal-poor galaxies at high redshift by the James Webb Space Telescope has sparked renewed interest in exploring the chemical evolution of carbon, nitrogen, and oxygen (the CNO elements) at early times and prompted fresh inquiries in…
Unveiling the journey of a highly inclined CME. Insights from the March 13, 2012, event with 110° longitudinal separation
Lario, D.; Jian, L. K.; Temmer, M. +8 more
Context. A fast (∼2000 km s−1) and wide (> 110°) coronal mass ejection (CME) erupted from the Sun on March 13, 2012. Its interplanetary counterpart was detected in situ two days later by STEREO-A and near-Earth spacecraft, such as ACE, Wind, and Cluster. We suggest that at 1 au the CME extended at least 110° in longitude, with Earth …
Constraining the stochastic gravitational wave background using the future lunar seismometers
Zhang, Fan; Chen, Xian; Shao, Lijing +3 more
Motivated by the old idea of using the Moon as a resonant gravitational wave (GW) detector, as well as the recent updates in modeling the lunar response to GWs, we reevaluate the feasibility of using a network of lunar seismometers to constrain the stochastic GW background (SGWB). In particular, using the updated model of the lunar response, we de…
Discovery of a Dusty Yellow Supergiant Progenitor for the Type IIb SN 2017gkk
Niu, Zexi; Sun, Ning-Chen; Liu, Jifeng
Type IIb supernovae are an important subclass of stripped-envelope supernovae (SNe), which show H lines only at early times. Their progenitors are believed to contain a low-mass H envelope before explosion. This work reports the discovery of a progenitor candidate in preexplosion Hubble Space Telescope images for the Type IIb SN 2017gkk. With deta…
Constraining the top-light initial mass function in the extended ultraviolet disk of M 83
Knapen, J. H.; Comerón, S.; Venhola, A. +3 more
Context. The universality or non-universality of the initial mass function (IMF) has significant implications for determining star formation rates and star formation histories from photometric properties of stellar populations.
Aims: We reexamine whether the IMF is deficient in high-mass stars (top-light) in the low-density environment of the…
Discovery and timing of pulsar J2016+3711 in supernova remnant CTB 87 with FAST
Li, Di; Zhou, Ping; Chen, Yang +4 more
We report on our discovery of the radio pulsar, PSR J2016+3711, in supernova remnant (SNR) CTB 87, with a ~10.8σ significance of pulses, which confirms the compact nature of the X-ray point source in CTB 87. It is the first pulsar discovered in SNRs using Five-hundred-meter Aperture Spherical radio Telescope (FAST). Its integrated radio pulse prof…
Asteroid reflectance spectra from Gaia DR3: Near-UV in primitive asteroids
Tatsumi, E.; Tanga, P.; Licandro, J. +4 more
Context. In the context of charge-coupled devices (CCDs), the ultraviolet (UV) region has mostly remained unexplored after the 1990s. Gaia DR3 offers the community a unique opportunity to explore tens of thousands of asteroids in the near-UV as a proxy of the UV absorption. This absorption has been proposed in previous works as a diagnostic of hyd…
Ground- and Space-based Dust Observations of VV 191 Overlapping Galaxy Pair
Grogin, Norman A.; Holwerda, Benne W.; Koekemoer, Anton M. +12 more
The Balmer decrement (Hα/Hβ) provides a constraint on attenuation, the cumulative effects of dust grains in the ISM. The ratio is a reliable spectroscopic tool for deriving the dust properties of galaxies that determine many different quantities such as star formation rate, metallicity, and SED models. Here, we measure independently both the atten…