Search Publications
KDG218, a nearby ultra-diffuse galaxy
Sharina, M. E.; Karachentsev, I. D.; Makarova, L. N. +1 more
We present properties of the low-surface-brightness galaxy KDG218 observed with the HST/ACS. The galaxy has a half-light (effective) diameter of ae = 47″ and a central surface brightness of SBV(0) = 24.m4/□″. The galaxy remains unresolved with the HST/ACS, which implies its distance of D > 13.1 Mpc and linear ef…
Infrared dust bubble CS51 and its interaction with the surrounding interstellar medium
Tej, Anandmayee; Liu, Hong-Li; Liu, Tie +4 more
A multiwavelength investigation of the southern infrared dust bubble CS51 is presented in this paper. We probe the associated ionized, cold dust, molecular and stellar components. Radio continuum emission mapped at 610 and 1300 MHz, using the Giant Metrewave Radio Telescope, India, reveals the presence of three compact emission components (A, B, a…
Climbing the cosmic ladder with stellar twins in RAVE with Gaia
Gilmore, G.; Munari, U.; Steinmetz, M. +17 more
We apply the twin method to determine parallaxes to 232 545 stars of the RAVE survey using the parallaxes of Gaia DR1 as a reference. To search for twins in this large data set, we apply the t-student stochastic neighbour embedding projection that distributes the data according to their spectral morphology on a two-dimensional map. From this map, …
XMM-Newton and INTEGRAL view of the hard state of EXO 1745-248 during its 2015 outburst
Stella, L.; de Martino, D.; Rea, N. +10 more
Context. Transient low-mass X-ray binaries (LMXBs) often show outbursts that typically last a few weeks and are characterized by a high X-ray luminosity (Lx ≈ 1036-1038 erg s-1), while most of the time they are found in X-ray quiescence (LX ≈ 1031-1033 erg s-1)…
The PMA Catalogue: 420 million positions and absolute proper motions
Akhmetov, V. S.; Fedorov, P. N.; Velichko, A. B. +1 more
We present a catalogue that contains about 420 million absolute proper motions of stars. It was derived from the combination of positions from Gaia DR1 and 2MASS, with a mean difference of epochs of about 15 yr. Most of the systematic zonal errors inherent in the 2MASS Catalogue were eliminated before deriving the absolute proper motions. The abso…
No Evidence for Feedback: Unexceptional Low-ionization Winds in Host Galaxies of Low Luminosity Active Galactic Nuclei at Redshift z ∼ 1
Prochaska, J. Xavier; Faber, S. M.; Coil, Alison L. +6 more
We study winds in 12 X-ray AGN host galaxies at z∼ 1. We find, using the low-ionization Fe II λ2586 absorption in the stacked spectra, that the probability distribution function (PDF) of the centroid-velocity shift in AGNs has 50th (median), 16th, and 84th percentiles of (-87, -251, +86) km s-1 respectively. The PDF of the velocity disp…
Variations between Dust and Gas in the Diffuse Interstellar Medium. III. Changes in Dust Properties
Heiles, Carl; Reach, William T.; Bernard, Jean-Philippe +1 more
We study infrared emission of 17 isolated, diffuse clouds with masses of order {10}2 {M}⊙ to test the hypothesis that grain property variations cause the apparently low gas-to-dust ratios that have been measured in those clouds. Maps of the clouds were constructed from Wide-field Infrared Survey Explorer (WISE) data and dire…
Shocks and Spatially Offset Active Galactic Nuclei Produce Velocity Offsets in Emission Lines
Greene, Jenny E.; Comerford, Julia M.; Barrows, R. Scott +1 more
While 2% of active galactic nuclei (AGNs) exhibit narrow emission lines with line-of-sight velocities that are significantly offset from the velocity of the host galaxy’s stars, the nature of these velocity offsets is unknown. We investigate this question with Chandra/ACIS and Hubble Space Telescope/Wide Field Camera 3 observations of seven veloci…
Spectral Variability of Two Rapidly Rotating Brown Dwarfs: 2MASS J08354256-0819237 and 2MASS J18212815+1414010
Schlawin, E.; Burgasser, Adam J.; Gizis, J. E. +2 more
L dwarfs exhibit low-level, rotationally modulated photometric variability generally associated with heterogeneous, cloud-covered atmospheres. The spectral character of these variations yields insight into the particle sizes and vertical structure of the clouds. Here, we present the results of a high-precision, ground-based, near-infrared, spectra…
Recovering a redshift-extended varying speed of light signal from galaxy surveys
Salzano, Vincenzo
We investigate a new method to recover (if any) a possible varying speed of light (VSL) signal from cosmological data. It comes as an upgrade by Salzano, Dąbrowski, and Lazkoz [Phys. Rev. Lett.114, 101304 (2015), 10.1103/PhysRevLett.114.101304; Phys. Rev. D 93, 063521 (2016), 10.1103/PhysRevD.93.063521], where it was argued that such a signal coul…