IXPE and XMM-Newton observations of the Soft Gamma Repeater SGR 1806-20

Kavli Affiliate: Herman L. Marshall | First 5 Authors: Roberto Turolla, Roberto Taverna, Gian Luca Israel, Fabio Muleri, Silvia Zane | Summary: Recent observations with the Imaging X-ray Polarimetry Explorer (IXPE) of two anomalous X-ray pulsars provided evidence that X-ray emission from magnetar sources is strongly polarized. Here we report on the joint IXPE and […]


Continue.. IXPE and XMM-Newton observations of the Soft Gamma Repeater SGR 1806-20

Survey of X-rays from Massive Stars Observed at High Spectral Resolution with Chandra

Kavli Affiliate: David P. Huenemoerder | First 5 Authors: Pragati Pradhan, David P. Huenemoerder, Richard Ignace, Joy S. Nichols, A. M. T. Pollock | Summary: Identifying trends between observational data and the range of physical parameters of massive stars is a critical step to the still-elusive full understanding of the source, structure, and evolution of […]


Continue.. Survey of X-rays from Massive Stars Observed at High Spectral Resolution with Chandra

AGN STORM 2: V. Anomalous Behavior of the CIV Light Curve in Mrk 817

Kavli Affiliate: Erin A. Kara | First 5 Authors: Y. Homayouni, Gerard A. Kriss, Gisella De Rosa, Rachel Plesha, Edward M. Cackett | Summary: An intensive reverberation mapping campaign on the Seyfert 1 galaxy Mrk817 using the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST) revealed significant variations in the response of the […]


Continue.. AGN STORM 2: V. Anomalous Behavior of the CIV Light Curve in Mrk 817

AGN STORM 2: V. Anomalous Behavior of the CIV Light Curve in Mrk 817

Kavli Affiliate: Erin A. Kara | First 5 Authors: Y. Homayouni, Gerard A. Kriss, Gisella De Rosa, Rachel Plesha, Edward M. Cackett | Summary: An intensive reverberation mapping campaign on the Seyfert 1 galaxy Mrk817 using the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST) revealed significant variations in the response of the […]


Continue.. AGN STORM 2: V. Anomalous Behavior of the CIV Light Curve in Mrk 817

AGN STORM 2: V. Anomalous Behavior of the CIV Light Curve in Mrk 817

Kavli Affiliate: Erin A. Kara | First 5 Authors: Y. Homayouni, Gerard A. Kriss, Gisella De Rosa, Rachel Plesha, Edward M. Cackett | Summary: An intensive reverberation mapping campaign on the Seyfert 1 galaxy Mrk817 using the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST) revealed significant variations in the response of the […]


Continue.. AGN STORM 2: V. Anomalous Behavior of the CIV Light Curve in Mrk 817

IXPE and multi-wavelength observations of blazar PG 1553+113 reveal an orphan optical polarization swing

Kavli Affiliate: Herman L. Marshall | First 5 Authors: Riccardo Middei, Matteo Perri, Simonetta Puccetti, Ioannis Liodakis, Laura Di Gesu | Summary: The lower energy peak of the spectral energy distribution of blazars has commonly been ascribed to synchrotron radiation from relativistic particles in the jets. Despite the consensus regarding jet emission processes, the particle […]


Continue.. IXPE and multi-wavelength observations of blazar PG 1553+113 reveal an orphan optical polarization swing

The proto-galaxy of Milky Way-mass haloes in the FIRE simulations

Kavli Affiliate: Lina Necib | First 5 Authors: Danny Horta, Emily C. Cunningham, Robyn Sanderson, Kathryn V. Johnston, Alis Deason | Summary: Observational studies are finding stars believed to be relics of the earliest stages of hierarchical mass assembly of the Galaxy. In this work, we contextualize these findings by studying the masses, ages, spatial […]


Continue.. The proto-galaxy of Milky Way-mass haloes in the FIRE simulations

The proto-galaxy of Milky Way-mass haloes in the FIRE simulations

Kavli Affiliate: Lina Necib | First 5 Authors: Danny Horta, Emily C. Cunningham, Robyn Sanderson, Kathryn V. Johnston, Alis Deason | Summary: Observational studies are finding stars believed to be relics of the earliest stages of hierarchical mass assembly of the Milky Way (i.e., proto-Galaxy). In this work, we contextualize these findings by studying the […]


Continue.. The proto-galaxy of Milky Way-mass haloes in the FIRE simulations

The proto-galaxy of Milky Way-mass haloes in the FIRE simulations

Kavli Affiliate: Lina Necib | First 5 Authors: Danny Horta, Emily C. Cunningham, Robyn Sanderson, Kathryn V. Johnston, Alis Deason | Summary: Observational studies are finding stars believed to be relics of the earliest stages of hierarchical mass assembly of the Milky Way (i.e., proto-Galaxy). In this work, we contextualize these findings by studying the […]


Continue.. The proto-galaxy of Milky Way-mass haloes in the FIRE simulations

Elentári: A $zsim3.3$ Proto-Supercluster in COSMOS

Kavli Affiliate: Michael McDonald | First 5 Authors: Ben Forrest, Brian C. Lemaux, Ekta Shah, Priti Staab, Ian McConachie | Summary: Motivated by spectroscopic confirmation of three overdense regions in the COSMOS field at $zsim3.35$, we analyze the uniquely deep multi-wavelength photometry and extensive spectroscopy available in the field to identify any further related structure. […]


Continue.. Elentári: A $zsim3.3$ Proto-Supercluster in COSMOS