Zobrazeno 1 - 10
of 910
pro vyhledávání: '"Cigan, A."'
Autor:
Makarov, Valeri V., Cigan, Phil, Gordon, David, Johnson, Megan C., DiLullo, Christopher, Lambert, Sébastien
Published analyses of very long baseline interferometry (VLBI) data for the sources included in the third International Celestial Reference Frame (ICRF3) catalog have revealed object-specific, excess astrometric variability and quasi-coherent traject
Externí odkaz:
http://arxiv.org/abs/2411.16951
Autor:
Cigan, Phil, Makarov, Valeri, Secrest, Nathan, Gordon, David, Johnson, Megan, Lambert, Sebastien
Using very long baseline interferometry data for the sources that comprise the third International Celestial Reference Frame (ICRF3), we examine the quality of the formal source position uncertainties of ICRF3 by determining the excess astrometric va
Externí odkaz:
http://arxiv.org/abs/2408.01373
Astronomical time series often have non-uniform sampling in time, or irregular cadences, with long gaps separating clusters of observations. Some of these data sets are also explicitly non-Gaussian with respect to the expected model fit, or the simpl
Externí odkaz:
http://arxiv.org/abs/2405.12324
Autor:
Archer, Haylee N., Hunter, Deidre A., Elmegreen, Bruce G., Rubio, Monica, Cigan, Phil, Windhorst, Rogier A., Cortés, Juan R., Jansen, Rolf A.
Wolf-Lundmark-Melotte (WLM) is a Local Group dwarf irregular (dIrr) galaxy with a metallicity 13% of solar. At 1 Mpc, the relative isolation of WLM provides a unique opportunity to investigate the internal mechanisms of star formation at low metallic
Externí odkaz:
http://arxiv.org/abs/2404.12482
Autor:
Matsuura, Mikako, Boyer, M., Arendt, Richard G., Larsson, J., Fransson, C., Rest, A., Ravi, A. P., Park, S., Cigan, P., Temim, T., Dwek, E., Barlow, M. J., Bouchet, P., Clayton, G., Chevalier, R., Danziger, J., De Buizer, J., De Looze, I., De Marchi, G., Fox, O., Gall, C., Gehrz, R. D., Gomez, H. L., Indebetouw, R., Kangas, T., Kirchschlager, F., Kirshner, R., Lundqvist, P., Marcaide, J. M., Martí-Vidal, I., Meixner, M., Milisavljevic, D., Orlando, S., Otsuka, M., Priestley, F., Richards, A. M. S., Schmidt, F., Staveley-Smith, L., Smith, Nathan, Spyromilio, J., Vink, J., Wang, Lifan, Watson, D., Wesson, R., Wheeler, J. C., Woodward, C. E., Zanardo, G., Alp, D., Burrows, D.
JWST/NIRCam obtained high angular-resolution (0.05-0.1''), deep near-infrared 1--5 micron imaging of Supernova (SN) 1987A taken 35 years after the explosion. In the NIRCam images, we identify: 1) faint H2 crescents, which are emissions located betwee
Externí odkaz:
http://arxiv.org/abs/2404.10042
Autor:
Shuvo, Onic I., Johnson, Megan C., Secrest, Nathan J., Gliozzi, Mario, Cigan, Phillip J., Fischer, Travis C., Van Der Horst, Alexander J.
We present results from the Very Long Baseline Array (VLBA) multi-frequency (1.6, 4.4, 8.6, 22 GHz), high-sensitivity (~25 microJy beam^-1), sub-parsec scale (<1 pc) observations and Spectral Energy Distributions (SEDs) for a sample of 12 local activ
Externí odkaz:
http://arxiv.org/abs/2312.04452
Autor:
Arendt, Richard G., Boyer, Martha L., Dwek, Eli, Matsuura, Mikako, Ravi, Aravind P., Rest, Armin, Chevalier, Roger, Cigan, Phil, De Looze, Ilse, De Marchi, Guido, Fransson, Claes, Gall, Christa, Gehrz, R. D., Gomez, Haley L., Kangas, Tuomas, Kirchschlager, Florian, Kirshner, Robert P., Larsson, Josefin, Lundqvist, Peter, Milisavljevic, Dan, Park, Sangwook, Smith, Nathan, Spyromilio, Jason, Temim, Tea, Wang, Lifan, Wheeler, J. Craig, Woodward, Charles E.
JWST NIRCam observations at 1.5-4.5 $\mu$m have provided broad and narrow band imaging of the evolving remnant of SN 1987A with unparalleled sensitivity and spatial resolution. Comparing with previous marginally spatially resolved Spitzer IRAC observ
Externí odkaz:
http://arxiv.org/abs/2309.13011
Autor:
Taeyong Kwon, Bianca L. Artiaga, Chester D. McDowell, Kristin M. Whitworth, Kevin D. Wells, Randall S. Prather, Gustavo Delhon, Mark Cigan, Stephen N. White, Jamie Retallick, Natasha N. Gaudreault, Igor Morozov, Juergen A. Richt
Publikováno v:
Emerging Microbes and Infections, Vol 13, Iss 1 (2024)
Proteolytic activation of the haemagglutinin (HA) glycoprotein by host cellular proteases is pivotal for influenza A virus (IAV) infectivity. Highly pathogenic avian influenza viruses possess the multibasic cleavage site of the HA which is cleaved by
Externí odkaz:
https://doaj.org/article/c3e9253f8e284d6d948f38a58d882f8a
Autor:
Matsuura, Mikako, Wesson, Roger, Arendt, Richard G., Dwek, Eli, De Buizer, James M., Danziger, John, Bouchet, Patrice, Barlow, M. J., Cigan, Phil, Gomez, Haley L., Rho, Jeonghee, Meixner, Margaret
At a distance of 50 kpc, Supernova 1987A is an ideal target to study how a young supernova (SN) evolves in time. Its equatorial ring, filled with material expelled from the progenitor star about 20,000 years ago, has been engulfed with SN blast waves
Externí odkaz:
http://arxiv.org/abs/2210.10440
Autor:
Shuvo, Onic I., Johnson, Megan C., Secrest, Nathan J., Gliozzi, Mario, Fischer, Travis C., Cigan, Phillip J., Fernandez, Luis C., Dorland, Bryan N.
We present follow-up results from the first Fundamental Reference AGN Monitoring Experiment (FRAMEx) X-ray/radio snapshot program of a volume-complete sample of local hard X-ray-selected active galactic nuclei (AGNs). Here, we added 9 new sources to
Externí odkaz:
http://arxiv.org/abs/2208.05848