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14 papers · 2 filters
FU Orionis: A Binary Star?
Hongchi Wang, Daniel Apai, Thomas Henning +1
By using the ALFA adaptive optics system at the 3.6m telescope of the Calar Alto Observatory we detected a faint red star in the apparent vicinity of FU Ori, the prototype of the F…
Constraining the origin of TeV photons from gamma-ray bursts with delayed MeV-GeV emission formed by interaction with cosmic infrared/microwave background photons
X. Y. Wang, K. S. Cheng, Z. G. Dai +1
It has been suggested that electromagnetic cascade of very high energy gamma-rays from gamma-ray bursts (GRBs) in the infrared/microwave background can produce delayed MeV-GeV phot…
Can the Bump be Observed in the Early Afterglow of GRBS with X-Ray Line Emission Features?
W. H. Gao, D. M. Wei
Extremely powerful emission lines are observed in the X-ray afterglow of several GRBs. The energy contained in the illuminating continuum which is responsible for the line producti…
Strong GeV Emission Accompanying TeV Blazar H1426+428
Y. Z. Fan, Z. G. Dai, D. M. Wei
For High frequency BL Lac objects (HBLs) like H1426+428, a significant fraction of their TeV gamma-rays emitted are likely to be absorbed in interactions with the diffuse IR backgr…
HCN Survey of Normal Spiral, IR-luminous and Ultraluminous Galaxies
Yu Gao, Philip M. Solomon
We report systematic HCN J=1-0 (and CO) observations of a sample of 53 infrared (IR) and/or CO-bright and/or luminous galaxies, including seven ultraluminous infrared galaxies, nea…
The Star Formation Rate and Dense Molecular Gas in Galaxies
Yu Gao, Philip M. Solomon
(abridged) HCN luminosity Lhcn is a tracer of DENSE molecular gas, n(H_2) >~ 3x10^4 cm^{-3}, associated with star-forming giant molecular cloud (GMC) cores. We present the results…