Search Publications
Is Fermi 1544-0649 a Misaligned Blazar? Discovering the Jet Structure with Very Long Baseline Interferometry
Zhang, Zhongli; Chen, Wen; Cheng, Xiaopeng +8 more
Fermi J1544-0649 is a transient GeV source first detected during its GeV flares in 2017. Multiwavelength observations during the flaring time demonstrate variability and spectral energy distributions that are typical of a blazar. Other than the flare time, Fermi J1544-0649 is quiet in the GeV band and has looked rather like a quiet galaxy (2MASX J…
CME-related Large Decreases in the Differential Phase Delay of Tianwen-1 DOR Signals
Liu, Kaijun; Guo, Li; He, Qingbao +2 more
Differential phase delay is calculated for the differential one-way range (DOR) signals transmitted by Tianwen-1, the first Chinese Mars spacecraft that entered into the Mars orbit on 2021 February 10. Large decreases in the differential phase delay are identified in the DOR signals received by ground stations on 2021 March 23 and June 18. The dec…
Diagnosing Triggered Star Formation in the Galactic H II region Sh 2-142
Chen, Wen Ping; Gao, Yu; Sun, Yan +2 more
Stars are formed by gravitational collapse, spontaneously or, in some cases under the constructive influence of nearby massive stars, out of molecular cloud cores. Here we present an observational diagnosis of such triggered formation processes in the prominent H II region Sh 2-142, which is associated with the young star cluster NGC 7380, and wit…
Mid-infrared and Maser Flux Variability Correlation in Massive Young Stellar Object G036.70+00.09
Ichikawa, Kohei; Uchiyama, Mizuho; Yonekura, Yoshinori +2 more
We present the discovery of the simultaneous flux variation of a massive young stellar object (MYSO) G036.70+00.09 (G036.70) both in the maser emission and mid-infrared (MIR; λ = 3-5 µm) bands. Using the ALLWISE and NEOWISE archival databases that cover a long time span of approximately 10 yr with a cadence of 6 months, we confirm that G036.…
The Solar Eruption of 2017 September 10: Wavy with a Chance of Protons
Pizzo, V. J.; de Koning, Curt A.; Seaton, Daniel B.
High-resolution SUVI images reveal an interesting new picture of particle acceleration in powerful solar eruptions. Typically, powerful solar eruptions include a coronal wave component, as well the traditional CME and flare components. At low solar altitudes, coronal waves refract downward, toward the solar surface, because of the slower Alfvén sp…
The CGM-GRB Study. II. Outflow-Galaxy Connection at z 2-6
Cenko, S. Bradley; Veilleux, Sylvain; Perley, Daniel +4 more
We use a sample of 27 gamma-ray bursts (GRBs) at redshift z = 2-6 to probe the outflows in their respective host galaxies (log(M */M ⊙) ~ 9-11) and search for possible relations between the outflow properties and those of the host galaxies, such as M *, the star formation rate (SFR), and the specific SFR (sSFR). Fi…
The Small Separation A-star Companion Population: First Results with CHARA/MIRC-X
Lanthermann, Cyprien; Anugu, Narsireddy; Kraus, Stefan +9 more
We present preliminary results from our long-baseline interferometry (LBI) survey to constrain the multiplicity properties of intermediate-mass A-type stars within 80 pc. Previous multiplicity studies of nearby stars exhibit orbital separation distributions well fitted with a lognormal with peaks >15 au, increasing with primary mass. The A-star…
Identification and Parameter Determination of F-type Herbig Stars from LAMOST DR8
Luo, A. -Li; Hou, Wen; Jiang, Biwei +5 more
We identify 20 F-type Herbig stars and provide a list of 22 pre-main-sequence candidates from LAMOST DR8. The effective temperature, distance, extinction, stellar luminosity, mass, age, and radius are derived for each Herbig star based on optical spectra, photometry, Gaia EDR3 parallaxes, and pre-main-sequence evolutionary tracks. According to spe…
The Radial Evolution of Magnetic Clouds From Helios to Ulysses
Wang, Yuming; Li, Xiaolei; Cai, Qiangwei +5 more
The evolution of a magnetic cloud (MC) from the inner heliosphere to the outer heliosphere has been investigated for decades. Although many studies have reported on the evolution of MCs, there is no relevant statistical study about the continuous parametric evolution of the flux rope model of the Gold-Hoyle solution for MCs from near the Sun to 5.…
Discovery of a Compact X-Ray Object with a 614 s Periodicity in the Direction of the Galactic Center
Gong, Hang
We report on analysis of X-ray, optical, and radio observations of the previously overlooked X-ray source 2CXO J174517.0-321356 located just 3.°2 away from the Galactic center. Timing analysis of X-ray observations of the source with XMM-Newton reveals periodic pulsations with periods of 1228 and 614 s, with the latter being tentatively considered…