Results 71 to 80 of about 441,685 (256)

Can decaying particle explain cosmic infrared background excess?

Physics Letters B, 2017
Recently the CIBER experiment measured the diffuse cosmic infrared background (CIB) flux and claimed an excess compared with integrated emission from galaxies. We show that the CIB spectrum can be fitted by the additional photons produced by the decay of
Kazunori Kohri, Takeo Moroi, Kazunori Nakayama   +2 more
doaj   +1 more source

The Process We Call Earth: Relationships Between Dynamic Feedbacks and the Search for Gaiasignatures in a New Paradigm of Earthlikeness

Perspectives of Earth and Space Scientists, Volume 5, Issue 1, December 2024.
Abstract Standard notions of an “Earthlike” planet rely solely on physical and material properties, like planetary mass, radius, and surface temperature. Here, we introduce a novel, relational perspective on what defines “Earthlikeness.” In our process‐based framework, rocky planets are local pockets of free energy that have the potential to drive the ...
Michael L. Wong, Marissa Duckett, Emilia S. Hernandez, Vahab Rajaei, Kayla J. Smith   +4 more
wiley   +1 more source

A Hubble Space Telescope Survey of X-ray Luminous Galaxy Clusters: Gravitationally Lensed Arcs and EROs [PDF]

arXiv, 2002
We are conducting a systematic lensing survey of X-ray luminous galaxy clusters at z~0.2 using the Hubble Space Telescope and large ground-based telescopes. We summarize initial results from our survey, including a measurement of the inner slope of the mass profile of A383, and a search for gravitationally lensed Extremely Red Objects.
arxiv  

Characterizing the Modulation and Activation‐Triggering Mechanisms of Main‐Belt Comets via 3D Thermophysical Modeling of an Ellipsoidal Body

Journal of Geophysical Research: Planets, Volume 129, Issue 12, December 2024.
Abstract Main‐belt objects (MBOs) with volatile components provide important insights into the solar system's evolution and the origin of Earth's water. In this study, we employ a 3D thermophysical model to simulate the evolution of a representative ellipsoidal main‐belt comet (MBC) and investigate the factors influencing its gas and dust activity. Our
Yun Zhang, Christine M. Hartzell
wiley   +1 more source

Obtaining accurate radial velocities for Cepheid companions using the STIS echelles

EPJ Web of Conferences, 2017
We discuss the high dispersion echelle observations of the hot binary companions of six Cepheids with known radial-velocity orbits that we have obtained with the STIS FUV E140H mode on board the Hubble Space Telescope, with the goal of determining the ...
Proffitt C. R., Evans N.R., Winston E.M., Gallenne A., Kervella P.   +4 more
doaj   +1 more source

Solar Wind Power Likely Governs Uranus' Thermosphere Temperature

Geophysical Research Letters, Volume 51, Issue 22, 28 November 2024.
Abstract Observations of Uranus in the near‐infrared by ground‐based telescopes from 1992 to 2018 have shown that the planet's upper atmosphere (thermosphere) steadily cooled from ∼700 to ∼450 K. We explain this cooling as due to the concurrent decline in the power of the solar wind incident on Uranus' magnetic field, which has dropped by ∼50% over the
A. Masters, J. R. Szalay, S. Zomerdijk‐Russell, M. M. Kao   +3 more
wiley   +1 more source

The Hubble Legacy Archive NICMOS Grism Data [PDF]

, 2008
The Hubble Legacy Archive (HLA) aims to create calibrated science data from the Hubble Space Telescope archive and make them accessible via user-friendly and Virtual Observatory (VO) compatible interfaces. It is a collaboration between the Space Telescope Science Institute (STScI), the Canadian Astronomy Data Centre (CADC) and the Space Telescope ...
arxiv   +1 more source

Nitrogen Fixation at Paleo‐Mars in an Icy Atmosphere

Geophysical Research Letters, Volume 51, Issue 21, 16 November 2024.
Abstract Recent findings of NO near Gale Crater on Mars have been explained by two pathways: formation of nitric acid (HNO3) in a warm climate or formation of peroxynitric acid (HO2NO2) in a cool climate. Here, we put forth two hitherto unexplored pathways: (a) deposition of nitric/peroxynitric acid onto ice particles in a cold atmosphere, which settle
Danica Adams, Armin Kleinböhl, King‐Fai Li, Franklin P. Mills, Run‐Lie Shia, Robin Wordsworth, Yuk L. Yung   +6 more
wiley   +1 more source

Lithospheric Structure Above the Northern Appalachian Anomaly: Initial Results From the NEST Array

Geophysical Research Letters, Volume 51, Issue 19, 16 October 2024.
Abstract Seismic tomography observations show a low‐velocity feature in the upper mantle beneath eastern North America known as the Northern Appalachian Anomaly (NAA). Proposed models for the formation of the NAA include a remnant high‐temperature feature resulting from the passage of the Great Meteor Hotspot, edge‐driven convection, and ongoing ...
Kimberly Espinal, Maureen D. Long, Paul Karabinos, James R. Bourke   +3 more
wiley   +1 more source

JWST Observations Reject Unrecognized Crowding of Cepheid Photometry as an Explanation for the Hubble Tension at 8σ Confidence

The Astrophysical Journal Letters
We present high-definition observations with the James Webb Space Telescope (JWST) of >1000 Cepheids in a geometric anchor of the distance ladder, NGC 4258, and in five hosts of eight Type Ia supernovae, a far greater sample than previous studies with ...
Adam G. Riess, Gagandeep S. Anand, Wenlong Yuan, Stefano Casertano, Andrew Dolphin, Lucas M. Macri, Louise Breuval, Dan Scolnic, Marshall Perrin, Richard I. Anderson   +9 more
doaj   +1 more source