Search Publications
Subarcsecond Blobs in Flare-related Coronal Jets
Zhang, Q. M.; Ni, L.
In this paper, we report multiwavelength observations of subarcsecond blobs in coronal jets. In AR 12149, a C5.5 circular-ribbon flare occurred at ∼04:55 UT on 2014 August 24, which consisted of a discrete circular ribbon and a short inner ribbon inside. Two jets (jet1 and jet2) were related to the flare. Jet1 appeared first and experienced untwis…
Expected intermediate-mass black holes in the Virgo cluster - I. Early-type galaxies
Soria, Roberto; Graham, Alister W.
We expand upon the AMUSE-Virgo survey which imaged 100 early-type Virgo cluster galaxies with the Chandra X-ray Observatory, and we place an emphasis on potential intermediate-mass black holes (IMBHs). Virgo early-type galaxies with absolute magnitudes M_B≳ -20.5 mag have B-band luminosities that scale with the square of the stellar velocity dispe…
GROWTH on S190510g: DECam Observation Planning and Follow-up of a Distant Binary Neutron Star Merger Candidate
Duev, Dmitry A.; Kong, Albert K. H.; Cook, David O. +23 more
The first two months of the third Advanced LIGO and Virgo observing run (2019 April-May) showed that distant gravitational-wave (GW) events can now be readily detected. Three candidate mergers containing neutron stars (NS) were reported in a span of 15 days, all likely located more than 100 Mpc away. However, distant events such as the three new N…
SOFIA Far-infrared Imaging Polarimetry of M82 and NGC 253: Exploring the Supergalactic Wind
Morris, Mark R.; Staguhn, Johannes; Dowell, C. Darren +23 more
We present far-infrared polarimetry observations of M82 at 53 and 154 µm and NGC 253 at 89 µm, which were taken with High-resolution Airborne Wideband Camera-plus (HAWC+) in polarimetry mode on the Stratospheric Observatory for Infrared Astronomy. The polarization of M82 at 53 µm clearly shows a magnetic field geometry perpendicu…
Long-term Variations of Venus’s 365 nm Albedo Observed by Venus Express, Akatsuki, MESSENGER, and the Hubble Space Telescope
Marcq, Emmanuel; Imamura, Takeshi; Titov, Dmitrij V. +16 more
An unknown absorber near the cloud-top level of Venus generates a broad absorption feature from the ultraviolet (UV) to visible, peaking around 360 nm, and therefore plays a critical role in the solar energy absorption. We present a quantitative study of the variability of the cloud albedo at 365 nm and its impact on Venus’s solar heating rates ba…
The transitional gap transient AT 2018hso: new insights into the luminous red nova phenomenon
Gromadzki, M.; Mason, E.; Cappellaro, E. +20 more
Context. The absolute magnitudes of luminous red novae (LRNe) are intermediate between those of novae and supernovae (SNe), and show a relatively homogeneous spectro-photometric evolution. Although they were thought to derive from core instabilities in single stars, there is growing support for the idea that they are triggered by binary interactio…
Solar Irradiance Variability: Comparisons of Models and Measurements
Haberreiter, M.; Kopp, G.; Baranyi, T. +8 more
The Earth system responds to solar variability on a wide range of timescales. Knowledge of total solar irradiance (TSI) and solar spectral irradiance (SSI) spanning minutes to centuries is needed by scientists studying a broad array of research applications. For these purposes, the NOAA National Centers for Environmental Information (NCEI) Climate…
Simulating and interpreting deep observations in the Hubble Ultra Deep Field with the JWST/NIRSpec low-resolution `prism'
Charlot, Stéphane; Chevallard, Jacopo; Maseda, Michael V. +16 more
The James Webb Space Telescope (JWST) will enable the detection of optical emission lines in galaxies spanning a broad range of luminosities out to redshifts z ≳ 10. Measurements of key galaxy properties, such as star formation rate and metallicity, through these observations will provide unique insight into, e.g. the role of feedback from stars a…
The period-luminosity relation of red supergiants with Gaia DR2
Bedding, Timothy R.; Murphy, Simon J.; Dobie, Dougal +3 more
We revisit the K -band period-luminosity (P-L) relations of Galactic red supergiants using Gaia Data Release 2 parallaxes and up to 70 yr of photometry from AAVSO and ASAS campaigns. In addition, we examine 206 LMC red supergiants using 50 yr of photometric data from the digitized Harvard Astronomical Plate Collection. We identified periods by com…
Experimental phase function and degree of linear polarization of cometary dust analogues
Bertini, I.; Cremonese, G.; Lazzarin, M. +12 more
We present experimental phase function and degree of linear polarization curves for seven samples of cometary dust analogues namely: ground pieces of Allende, DaG521, FRO95002, and FRO99040 meteorites, Mg-rich olivine and pyroxene, and a sample of organic tholins. The experimental curves have been obtained at the IAA Cosmic Dust Laboratory at a wa…