Tiny-box: A tool for the versatile development and characterization of low noise fast X-ray imaging detectors

Posted by klaurent Stanford

Kavli Affiliate: Steven Allen | First 5 Authors: Tanmoy Chattopadhyay, Sven Herrmann, Steven Allen, Jack Hirschman, Glenn Morris | Summary: X-ray Charge Coupled Devices (CCDs) have been the workhorse for soft X-ray astronomical instruments for the past quarter century. They provide broad energy response, extremely low electronic read noise, and good energy resolution in soft […]


Continue.. Tiny-box: A tool for the versatile development and characterization of low noise fast X-ray imaging detectors

Interferometric Constraints on Spacelike Coherent Rotational Fluctuations

Posted by Chicago

Kavli Affiliate: Stephan S. Meyer | First 5 Authors: Jonathan W. Richardson, Ohkyung Kwon, H. Richard Gustafson, Craig Hogan, Brittany L. Kamai | Summary: Precision measurements are reported of the cross-spectrum of rotationally-induced differential position displacements in a pair of colocated 39 m long, high power Michelson interferometers. One arm of each interferometer is bent […]


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Interferometric Constraints on Spacelike Coherent Rotational Fluctuations

Posted by klaurent MIT

Kavli Affiliate: Rainer Weiss | First 5 Authors: Jonathan W. Richardson, Ohkyung Kwon, H. Richard Gustafson, Craig Hogan, Brittany L. Kamai | Summary: Precision measurements are reported of the cross-spectrum of rotationally-induced differential position displacements in a pair of colocated 39 m long, high power Michelson interferometers. One arm of each interferometer is bent $90^{circ}$ […]


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A possible bright ultraviolet flash from a galaxy at redshift z ~ 11

Posted by klaurent Peking

Kavli Affiliate: Linhua Jiang | First 5 Authors: Linhua Jiang, Shu Wang, Bing Zhang, Nobunari Kashikawa, Luis C. Ho | Summary: In the optical sky, minutes-duration transients from cosmological distances are rare. Known objects that give rise to such transients include gamma-ray bursts (GRBs), the most luminous explosions in the universe that have been detected […]


Continue.. A possible bright ultraviolet flash from a galaxy at redshift z ~ 11

The Cepheid Distance to the Narrow-Line Seyfert 1 Galaxy NGC 4051

Posted by klaurent MIT

Kavli Affiliate: Michael M. Fausnaugh | First 5 Authors: Wenlong Yuan, Lucas M. Macri, Bradley M. Peterson, Adam G. Riess, Michael M. Fausnaugh | Summary: We derive a distance of $D = 16.6 pm 0.3$~Mpc ($mu=31.10pm0.04$~mag) to the archetypal narrow-line Seyfert 1 galaxy NGC 4051 based on Cepheid Period–Luminosity relations and new Hubble Space Telescope […]


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Elliptical accretion disk as a model for tidal disruption events

Posted by dbos Peking

Kavli Affiliate: Fukun Liu | First 5 Authors: Fukun Liu, Chunyang Cao, Marek A. Abramowicz, Maciek Wielgus, Rong Cao | Summary: Elliptical accretion disk models for tidal disruption events (TDEs) have been recently proposed and independently developed by two groups. Although these two models are characterized by a similar geometry, their physical properties differ considerably. […]


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Joint Suzaku and Chandra observations of the MKW4 galaxy group out to the virial radius

Posted by klaurent MIT

Kavli Affiliate: Eric Miller | First 5 Authors: Arnab Sarkar, Yuanyuan Su, Scott Randall, Fabio Gastaldello, Isabella Trierweiler | Summary: We present joint Suzaku and Chandra observations of MKW4. With a global temperature of 1.6 keV, MKW4 is one of the smallest galaxy groups that have been mapped in X-rays out to the virial radius. […]


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Toward volume manufacturing of high-performance soft x-ray critical-angle transmission gratings

Posted by klaurent MIT

Kavli Affiliate: Ralf K. Heilmann | First 5 Authors: Ralf K. Heilmann, Alexander R. Bruccoleri, Jungki Song, Matthew T. Cook, James A. Gregory | Summary: High-resolution ($R = lambda /Delta lambda > 2000$) x-ray absorption and emission line spectroscopy in the soft x-ray band is a crucial diagnostic for the exploration of the properties of […]


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The Simons Observatory: Magnetic Sensitivity Measurements of Microwave SQUID Multiplexers

Posted by klaurent Stanford

Kavli Affiliate: Shawn Henderson | First 5 Authors: Eve M. Vavagiakis, Zeeshan Ahmed, Aamir Ali, Kam Arnold, Jason Austermann | Summary: The Simons Observatory (SO) will be a cosmic microwave background (CMB) survey experiment with three small-aperture telescopes and one large-aperture telescope, which will observe from the Atacama Desert in Chile. In total, SO will […]


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Black holes and the supermassive compact object at the Galactic center: multi-arts of thought and nature

Posted by klaurent Peking

Kavli Affiliate: Qingjuan Yu | First 5 Authors: Qingjuan Yu, , , , | Summary: This is an invited commentary on the Nobel Prize in Physics 2020 which was awarded to Roger Penrose "for the discovery that black hole formation is a robust prediction of the general theory of relativity," and Reinhard Genzel and Andrea […]


Continue.. Black holes and the supermassive compact object at the Galactic center: multi-arts of thought and nature