Search Publications
Star formation and AGN activity in a sample of local luminous infrared galaxies through multiwavelength characterization
Mattila, Seppo; Alberdi, Antxon; Väisänen, Petri +8 more
Nuclear starbursts and active galactic nucleus (AGN) activity are the main heating processes in luminous infrared galaxies (LIRGs) and their relationship is fundamental to understand galaxy evolution. In this paper, we study the star formation and AGN activity of a sample of 11 local LIRGs imaged with subarcsecond angular resolution at radio (8.4 …
Massive Star Cluster Formation and Destruction in Luminous Infrared Galaxies in GOALS
Kim, D. -C.; Surace, J. A.; Inami, H. +17 more
We present the results of a Hubble Space Telescope ACS/HRC FUV, ACS/WFC optical study into the cluster populations of a sample of 22 Luminous Infrared Galaxies in the Great Observatories All-Sky LIRG Survey. Through integrated broadband photometry, we have derived ages and masses for a total of 484 star clusters contained within these systems. Thi…
Radial and local time structure of the Saturnian ring current, revealed by Cassini
Krupp, N.; Dougherty, M. K.; Thomsen, M. F. +6 more
We analyze particle and magnetic field data obtained between July 2004 and December 2013 in the equatorial magnetosphere of Saturn, by the Cassini spacecraft. The radial and local time distribution of the total (thermal and suprathermal) particle pressure and total plasma beta (ratio of particle to magnetic pressure) over radial distances from 5 t…
X-Ray and Optical Study of the Gamma-ray Source 3FGL J0838.8-2829: Identification of a Candidate Millisecond Pulsar Binary and an Asynchronous Polar
Thorstensen, John R.; Bogdanov, Slavko; Halpern, Jules P.
We observed the field of the Fermi source 3FGL J0838.8-2829 in optical and X-rays, initially motivated by the cataclysmic variable (CV) 1RXS J083842.1-282723 that lies within its error circle. Several X-ray sources first classified as CVs have turned out to be γ-ray emitting millisecond pulsars (MSPs). We find that 1RXS J083842.1-282723 is in fact…
Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars
Gontcharov, George A.; Mosenkov, Aleksandr V.
We compare eight sources of reddening and extinction estimates for approximately 60 000 Gaia DR1 Tycho-Gaia Astrometric Solution (TGAS) main sequence stars younger than 3 Gyr with a relative error of the Gaia parallax less than 0.1. For the majority of the stars, the best 2D dust emission-based reddening maps show considerable differences between …
Massive 70 µm quiet clumps I: evidence of embedded low/intermediate-mass star formation activity
Peretto, N.; Schisano, E.; Billot, N. +5 more
Massive clumps, prior to the formation of any visible protostars, are the best candidates to search for the elusive massive starless cores. In this work, we investigate the dust and gas properties of massive clumps selected to be 70 µm quiet, therefore good starless candidates. Our sample of 18 clumps has masses 300 ≲ M ≲ 3000 M⊙,…
Kinematic structures of the solar neighbourhood revealed by Gaia DR1/TGAS and RAVE
Bensby, T.; Schirmer, T.; Kushniruk, I.
Context. The velocity distribution of stars in the solar neighbourhood is inhomogeneous and rich with stellar streams and kinematic structures. These may retain important clues regarding the formation and dynamical history of the Milky Way. However, the nature and origin of many of the streams and structures is unclear, hindering our understanding…
A Black Hole Mass Determination for the Compact Galaxy Mrk 1216
Gebhardt, Karl; Richstone, Douglas O.; Husemann, Bernd +4 more
Mrk 1216 is a nearby, early-type galaxy with a small effective radius of 2.8 kpc and a large stellar velocity dispersion of 308 km s-1 for its K-band luminosity of 1.4× {10}11 {L}⊙ . Using integral field spectroscopy assisted by adaptive optics from Gemini North, we measure spatially resolved stellar kinematics wit…
The MUSE Hubble Ultra Deep Field Survey. III. Testing photometric redshifts to 30th magnitude
Inami, H.; Kollatschny, W.; Richard, J. +14 more
We tested the performance of photometric redshifts for galaxies in the Hubble Ultra Deep field down to 30th magnitude. We compared photometric redshift estimates from three spectral fitting codes from the literature (EAZY, BPZ and BEAGLE) to high quality redshifts for 1227 galaxies from the MUSE integral field spectrograph. All these codes can ret…
Successive Homologous Coronal Mass Ejections Driven by Shearing and Converging Motions in Solar Active Region NOAA 12371
Vemareddy, P.
We study the magnetic field evolution in AR 12371, related to its successive eruptive nature. During the disk transit of seven days, the active region (AR) launched four sequential fast coronal mass ejections (CMEs), which are associated with long duration M-class flares. Morphological study delineates a pre-eruptive coronal sigmoid structure abov…