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The overmassive black hole in NGC 1277: new constraints from molecular gas kinematics
Krips, M.; Combes, F.; Scharwächter, J. +2 more
We report the detection of CO(1-0) emission from NGC 1277, a lenticular galaxy in the Perseus Cluster. NGC 1277 has previously been proposed to host an overmassive black hole (BH) compared to the galaxy bulge luminosity (mass), based on stellar-kinematic measurements. The CO(1-0) emission, observed with the IRAM Plateau de Bure Interferometer (PdB…
A Search for Short-period Rocky Planets around WDs with the Cosmic Origins Spectrograph (COS)
Debes, John H.; Hines, Dean C.; Bourque, Matthew +2 more
The search for transiting habitable exoplanets has broadened to include several types of stars that are smaller than the Sun in an attempt to increase the observed transit depth and hence the atmospheric signal of the planet. Of all spectral types, white dwarfs (WDs) are the most favorable for this type of investigation. The fraction of WDs that p…
The Impact of JWST Broadband Filter Choice on Photometric Redshift Estimation
Ilbert, O.; Nørgaard-Nielsen, H. U.; Colina, L. +8 more
The determination of galaxy redshifts in the James Webb Space Telescope’s (JWST) blank-field surveys will mostly rely on photometric estimates, based on the data provided by JWST’s Near-Infrared Camera (NIRCam) at 0.6-5.0 µm and Mid Infrared Instrument (MIRI) at λ > 5.0 µ {{m}}. In this work we analyze the impact of choosing differe…
A survey of superthermal electron flux depressions, or "electron holes," within the illuminated Martian induced magnetosphere
Fränz, M.; Lester, M.; Andrews, D. J. +4 more
Since Mars lacks a global intrinsic magnetic field, the solar wind interacts directly with the Martian upper atmosphere and ionosphere. The presence of localized intense remnant crustal magnetic fields adds to this interaction, making the Martian plasma system a unique environment within the solar system. Rapid reductions in the electron flux, ref…
On Understanding the Nature of Collisions of Coronal Mass Ejections Observed by STEREO
Wang, Yuming; Srivastava, Nandita; Mishra, Wageesh
We attempt to understand the collision characteristics of two coronal mass ejections (CMEs) launched successively from the Sun on 2013 October 25. The estimated kinematics, from three-dimensional (3D) reconstruction techniques applied to observations of CMEs by the SECCHI/Coronagraphic (COR) and Heliospheric Imagers, reveal their collision around …
The rotational dynamics of Titan from Cassini RADAR images
Iess, Luciano; Mitri, Giuseppe; Meriggiola, Rachele +2 more
Between 2004 and 2009 the RADAR instrument of the Cassini mission provided 31 SAR images of Titan. We tracked the position of 160 surface landmarks as a function of time in order to monitor the rotational dynamics of Titan. We generated and processed RADAR observables using a least squares fit to determine the updated values of the rotational para…
The Evolution of Far-infrared CO Emission from Protostars
Henning, T.; Manoj, P.; Megeath, S. T. +7 more
We investigate the evolution of far-IR CO emission from protostars observed with Herschel/PACS for 50 sources from the combined sample of HOPS and DIGIT Herschel key programs. From the uniformly sampled spectral energy distributions, whose peaks are well sampled, we computed the {L}{bol}, {T}{bol}, and {L}{bol}/{L}…
The Geometry of the Infrared and X-Ray Obscurer in a Dusty Hyperluminous Quasar
Brandt, William N.; Koss, Michael; Ricci, Claudio +24 more
We study the geometry of the active galactic nucleus (AGN) obscurer in IRAS 09104+4109, an IR-luminous, radio-intermediate FR-I source at z = 0.442, using infrared data from Spitzer and Herschel, X-ray data from NuSTAR, Swift, Suzaku, and Chandra, and an optical spectrum from Palomar. The infrared data imply a total rest-frame 1-1000 µm lumi…
Ordinary X-Rays from Three Extraordinary Millisecond Pulsars: XMM-Newton Observations of PSRs J0337+1715, J0636+5129, and J0645+5158
Kaplan, David L.; Stairs, Ingrid; Spiewak, Renée +8 more
We present the first X-ray observations of three recently discovered millisecond pulsars (MSPs) with interesting characteristics: PSR J0337+1715, PSR J0636+5129, and PSR J0645+5158. PSR J0337+1715 is a fast-spinning, bright, and so-far unique MSP in a hierarchical triple system with two white dwarf companions. PSR J0636+5129 is an MSP in a very ti…
The ionization rates of galactic nuclei and disks from Herschel/HIFI observations of water and its associated ions
van der Tak, F. F. S.; Güsten, R.; Weiß, A. +1 more
Context. Dense gas in galactic nuclei is known to feed central starbursts and AGN, but the properties of this gas are poorly known because of the high obscuration by dust.
Aims: Submm-wave spectroscopy of water and its associated ions is useful to trace the oxygen chemistry of interstellar gas, in particular to constrain its ionization rate. …