Search Publications
Missions
Journals
Publication Years
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…
QuickPol: Fast calculation of effective beam matrices for CMB polarization
Ponthieu, Nicolas; Hivon, Eric; Mottet, Sylvain
Current and planned observations of the cosmic microwave background (CMB) polarization anisotropies, with their ever increasing number of detectors, have reached a potential accuracy that requires a very demanding control of systematic effects. While some of these systematics can be reduced in the design of the instruments, others will have to be …
Using red clump stars to correct the Gaia DR1 parallaxes
Chaplin, William J.; Davies, Guy R.; Girardi, Léo +14 more
Recent results have suggested that there is tension between the Gaia DR1 TGAS distances and the distances obtained using luminosities determined by eclipsing binaries or asteroseismology on red giant stars. We use the Ks-band luminosities of red clump stars, identified and characterized by asteroseismology, to make independent distance …
Star formation histories in mergers: the spatially resolved properties of the early-stage merger luminous infrared galaxies IC 1623 and NGC 6090
González Delgado, R. M.; Di Matteo, P.; Sánchez, S. F. +8 more
The role of major mergers in galaxy evolution is investigated through a detailed characterization of the stellar populations, ionized gas properties and star formation rates (SFR) in the early-stage merger luminous infrared galaxies (LIRGs) IC 1623 W and NGC 6090, by analysing optical integral field spectroscopy and high-resolution Hubble Space Te…
The near-surface methane humidity on Titan
Lora, Juan M.; Ádámkovics, Máté
We retrieve vertical and meridional variations of methane mole fraction in Titan's lower troposphere by re-analyzing near-infrared ground-based observations from 17 July 2014 UT (Ádámkovics et al., 2016). We generate synthetic spectra using atmospheric methane profiles that do not contain supersaturation or discontinuities to fit the observations,…
Effective Acceleration Model for the Arrival Time of Interplanetary Shocks driven by Coronal Mass Ejections
Paouris, Evangelos; Mavromichalaki, Helen
In a previous work (Paouris and Mavromichalaki in Solar Phys. 292, 30, 2017), we presented a total of 266 interplanetary coronal mass ejections (ICMEs) with as much information as possible. We developed a new empirical model for estimating the acceleration of these events in the interplanetary medium from this analysis. In this work, we present a …
The Role of the Most Luminous Obscured AGNs in Galaxy Assembly at z ∼ 2
Tsai, Chao-Wei; Moustakas, Leonidas; Stern, Daniel +14 more
We present Hubble Space Telescope WFC3 F160W imaging and infrared spectral energy distributions for 12 extremely luminous, obscured active galactic nuclei (AGNs) at 1.8 < z < 2.7 selected via “hot, dust-obscured” mid-infrared colors. Their infrared luminosities span (2-15) × 1013 L ⊙, making them among the most luminous…