Search Publications
A Framework for Relative Biosignature Yields from Future Direct Imaging Missions
Tuchow, Noah W.; Wright, Jason T.
Future exoplanet direct imaging missions, such as HabEx and LUVOIR, will select target stars to maximize the number of Earth-like exoplanets that can have their atmospheric compositions characterized. Because one of these missions' aims is to detect biosignatures, they should also consider the expected biosignature yield of planets around these st…
Predicted Masses of Galactic Cepheids in the Gaia Data Release 2
Marconi, Marcella; Molinaro, Roberto; Ripepi, Vincenzo +4 more
On the basis of recently computed nonlinear convective pulsation models of Galactic Cepheids, spanning wide ranges of input stellar parameters, we derive theoretical mass-dependent Period-Wesenheit relations in the Gaia bands, namely, G, GBP, and GBR, that are found to be almost independent of the assumed efficiency of supera…
Magnetic Energy Balance in the Quiet Sun on Supergranular Spatial and Temporal Scales
Consolini, Giuseppe; Berrilli, Francesco; Del Moro, Dario +1 more
Small-scale magnetic fields are ubiquitous in the quiet solar photosphere and may store and transfer huge amounts of energy to the upper atmospheric layers. For this reason, it is fundamental to constrain the energetics of the quiet Sun. By taking advantage of a 24 hr long magnetogram time series acquired by the Hinode mission without interruption…
A Comprehensive Study of Hα Emitters at z ∼ 0.62 in the DAWN Survey: The Need for Deep and Wide Regions
Finkelstein, Steven L.; Mobasher, Bahram; Zheng, Zhen-Ya +19 more
We present new estimates of the luminosity function (LF) and star formation rate density (SFRD) for an Hα-selected sample at z ∼ 0.62 from the Deep And Wide Narrow-band (DAWN) survey. Our results are based on a new Hα sample in the extended COSMOS region (compared to Coughlin et al.) with the inclusion of flanking fields, resulting in a total area…
Imagery and UV Spectroscopy of the LMC Supernova Remnant N103B Using HST
Blair, William P.; Raymond, John C.; Pirzkal, Norbert +6 more
We present Hubble Space Telescope (HST)/Wide Field Camera 3 multiband imagery of N103B, which is the remnant of a SN Ia in the Large Magellanic Cloud, as well as HST/Cosmic Origins Spectrograph (COS) ultraviolet spectroscopy of the brightest radiatively shocked region. The images show a wide range of morphology and relative emission-line intensiti…
LAMOST J040643.69+542347.8: The Fastest Rotator in the Galaxy
Li, Guang-Wei
Rotation and binary interaction play important roles in understanding the nature of massive stars (≳8M⊙). Some interesting transients, such as the long-duration gamma-ray bursts, are thought to be originated from fast-rotating massive stars. Because the strong stellar wind can effectively spin down a metal-rich massive star with fast ro…
Gamma-Ray Emission Revealed at the Western Edge of SNR G344.7-0.1
Ajello, M.; Marchesi, S.; Eagle, J. +2 more
We report on the investigation of a very high energy (VHE), Galactic γ-ray source recently discovered at >50 GeV using the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope (Fermi). This object, 2FHL J1703.4-4145, displays a very hard >50 GeV spectrum with a photon index Γγ ∼ 1.2 in the 2FHL catalog and, as s…
First Embedded Cluster Formation in California Molecular Cloud
Xu, Jin-Long; Zhu, Ming; Xu, Ye +5 more
We performed a multi-wavelength observation toward the LkHα 101 embedded cluster and its adjacent 85'×60' region. The LkHα 101 embedded cluster is the first and only significant cluster in the California molecular cloud (CMC). These observations have revealed that the LkHα 101 embedded cluster is located just at the projected intersectional region…
Evolution from Spherical AGB Wind to Multipolar Outflow in Pre-planetary Nebula IRAS 17150-3224
Lee, Chin-Fei; Sahai, Raghvendra; Huang, Po-Sheng
We have mapped the pre-planetary nebula IRAS 17150-3224 in the 350 GHz continuum and CO J = 3-2 line at an angular resolution of ∼0"09 using the Atacama Large Millimeter/submillimeter Array. A continuum source is detected at the center of the nebula, elongated along the equatorial plane, likely tracing a dusty torus around the central source. Cont…
X-Ray Hotspots in the Northwest Shell of the Supernova Remnant RX J1713.7-3946
Uchiyama, Yasunobu; Tsuji, Naomi; Higurashi, Ryota
The supernova remnant (SNR) RX J1713.7-3946 is one of the best-studied accelerators of cosmic rays because of its strong nonthermal X-ray and gamma-ray radiation. We have analyzed accumulated Chandra observations with a total exposure time of ∼266 ks in the northwest rim of RX J1713.7-3946. We detect a substantially large number of point-like sour…