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Scaling Relations Between Warm Galactic Outflows and Their Host Galaxies
Chisholm, John; Leitherer, Claus; Chen, Yanmei +3 more
We report on a sample of 48 nearby, star-forming galaxies observed with the Cosmic Origin Spectrograph on the Hubble Space Telescope. We measure the kinematics of warm gas in galactic outflows using a combination of four Si ii absorption lines. We use multi-wavelength ancillary data to estimate stellar masses (M*), star formation rates …
X-Ray Constraints on the Local Supermassive Black Hole Occupation Fraction
Treu, Tommaso; Greene, Jenny E.; Gallo, Elena +4 more
Distinct seed formation mechanisms are imprinted upon the fraction of dwarf galaxies currently containing a central supermassive black hole. Seeding by Population III remnants is expected to produce a higher occupation fraction than is generated with direct gas collapse precursors. Chandra observations of nearby early-type galaxies can directly de…
Particle acceleration by a solar flare termination shock
Krucker, Säm; Chen, Bin; Gary, Dale E. +3 more
Solar flares—the most powerful explosions in the solar system—are also efficient particle accelerators, capable of energizing a large number of charged particles to relativistic speeds. A termination shock is often invoked in the standard model of solar flares as a possible driver for particle acceleration, yet its existence and role have remained…
Dust aerosol, clouds, and the atmospheric optical depth record over 5 Mars years of the Mars Exploration Rover mission
Lemmon, Mark T.; Smith, Michael D.; Bell, James F., III +3 more
Dust aerosol plays a fundamental role in the behavior and evolution of the martian atmosphere. The first five Mars years of Mars Exploration Rover data provide an unprecedented record of the dust load at two sites. This record is useful for characterization of the atmosphere at the sites and as ground truth for orbital observations. Atmospheric ex…
AEGIS-X: Deep Chandra Imaging of the Central Groth Strip
Barmby, P.; Ivison, R. J.; Cooper, M. C. +22 more
We present the results of deep Chandra imaging of the central region of the Extended Groth Strip, the AEGIS-X Deep (AEGIS-XD) survey. When combined with previous Chandra observations of a wider area of the strip, AEGIS-X Wide (AEGIS-XW), these provide data to a nominal exposure depth of 800 ks in the three central ACIS-I fields, a region of approx…
Hubble Space Telescope Proper Motion (HSTPROMO) Catalogs of Galactic Globular Cluster. II. Kinematic Profiles and Maps
Anderson, Jay; van der Marel, Roeland P.; Watkins, Laura L. +1 more
We present kinematical analyses of 22 Galactic globular clusters using the Hubble Space Telescope proper motion catalogs recently presented in Bellini et al. For most clusters, this is the first proper-motion study ever performed, and, for many, this is the most detailed kinematic study of any kind. We use cleaned samples of bright stars to determ…
Are Compton-thick AGNs the Missing Link between Mergers and Black Hole Growth?
Bell, Eric F.; Kartaltepe, Jeyhan S.; Kocevski, Dale D. +12 more
We examine the host morphologies of heavily obscured active galactic nuclei (AGNs) at z∼ 1 to test whether obscured super-massive black hole growth at this epoch is preferentially linked to galaxy mergers. Our sample consists of 154 obscured AGNs with {N}{{H}}\gt {10}23.5 {{cm}}-2 and z\lt 1.5. Using visual classif…
Density and Charge of Pristine Fluffy Particles from Comet 67P/Churyumov-Gerasimenko
Lamy, P. L.; Szego, K.; Fulle, M. +38 more
The Grain Impact Analyzer and Dust Accumulator (GIADA) instrument on board ESA’s Rosetta mission is constraining the origin of the dust particles detected within the coma of comet 67 P/Churyumov-Gerasimenko (67P). The collected particles belong to two families: (i) compact particles (ranging in size from 0.03 to 1 mm), witnessing the presence of m…
Radio Loud AGNs are Mergers
Lotz, Jennifer M.; Chiaberge, Marco; Norman, Colin +1 more
We measure the merger fraction of Type 2 radio-loud and radio-quiet active galactic nuclei (AGNs) at z\gt 1 using new samples. The objects have Hubble Space Telescope (HST) images taken with Wide Field Camera 3 (WFC3) in the IR channel. These samples are compared to the 3CR sample of radio galaxies at z\gt 1 and to a sample of non-active galaxies.…
Accretion-powered Pulsations in an Apparently Quiescent Neutron Star Binary
Deller, Adam T.; Lyne, Andrew G.; Bogdanov, Slavko +10 more
Accreting millisecond X-ray pulsars (AMXPs) are an important subset of low-mass X-ray binaries (LMXBs) in which coherent X-ray pulsations can be observed during occasional, bright outbursts (X-ray luminosity {L}{{X}}∼ {10}36 {erg} {{{s}}}-1). These pulsations show that matter is being channeled onto the neutron sta…