Search Publications
Clustering of red and blue galaxies around high-redshift 3C radio sources as seen by the Hubble Space Telescope
Chiaberge, Marco; West, Michael J.; Haas, Martin +5 more
To properly understand the evolution of high-redshift galaxy clusters, both passive and star-forming galaxies have to be considered. Here we study the clustering environment of 21 radio galaxies and quasars at 1 < z < 2.5 from the third Cambridge catalog (3C). We use optical and near-infrared Hubble Space Telescope images with a 2' field-of-…
X-Ray Sources in the 1.75 Ms Ultra Narrow Deep Field Observed by XMM-Newton
Vignali, C.; Nicastro, F.; Krongold, Y. +5 more
In this work, we present the results of the survey carried out on one of the deepest X-ray fields observed by the XMM-Newton satellite. The 1.75 Ms Ultra Narrow Deep Field (XMM175UNDF) survey is made by 13 observations taken over 2 yr with a total exposure time of 1.75 Ms (1.372 Ms after flare-filtered) in a field of 30' × 30' centered around the …
Forbidden atomic oxygen emissions in the Martian dayside upper atmosphere
Bhardwaj, Anil; Jain, Sonal Kumar; Raghuram, Susarla
Recently, Nadir and Occultation for Mars Discovery (NOMAD) ultraviolet and visible spectrometer instrument on board the European Space Agency's ExoMars Trace Gas Orbiter (TGO) simultaneously measured the limb emission intensities for both [OI] 2972 and 5577 Å (green) emissions in the dayside of Martian upper atmosphere. But the atomic oxygen red-d…
Multiscale spectral discrimination of poorly crystalline and intermixed alteration phases using aerial and ground-based ExoMars rover emulator data
Allender, E. J.; Cousins, C. R.; Gunn, M. D. +1 more
A key goal of the ExoMars rover Rosalind Franklin is to analyze accessible hydrated mineral deposits using panoramic multiscale and multispectral imagery. We conducted a multiscale spectroscopic study on hydrothermally-altered basalt-hosted soils in the geothermal area of Námafjall in northern Iceland. Basaltic lavas here that have experienced fir…
Evidence of Solar-cycle-related Structural Changes in the Solar Convection Zone
Basu, Sarbani
While it has been relatively easy to determine solar-cycle related changes in solar dynamics, determining changes in structure in the deeper layers of the Sun has proved to be difficult. By using helioseismic data obtained over two solar cycles, and sacrificing resolution in favor of lower uncertainties, we show that there are significant changes …
Automated Photometry of γ Cassiopeiae: The Last Roundup
Smith, M. A.; Henry, G. W.
γ Cassiopeiae (B0.5IVe) is the noted prototype of a subgroup of classical Be stars exhibiting hard thermal X-ray emission. This paper reports results from a 23 yr optical campaign on this star with an automated photometric telescope (APT). A series of unstable long cycles of length 56-91 days has nearly ceased over the last decade. Also, we revise…
An XMM-Newton Early-type Galaxy Atlas
Trinchieri, Ginevra; Lauer, Jennifer; Fabbiano, Giuseppina +9 more
The distribution of hot interstellar medium in early-type galaxies (ETGs) bears the imprint of the various astrophysical processes it underwent during its evolution. The X-ray observations of these galaxies have identified various structural features related to active galactic nucleus (AGN) and stellar feedback and environmental effects such as me…
[CII] emission properties of the massive star-forming region RCW 36 in a filamentary molecular cloud
Oyabu, S.; Nakagawa, T.; Ojha, D. K. +10 more
Aims: We investigate the properties of [C II] 158 µm emission of RCW 36 in a dense filamentary cloud.
Methods: [C II] observations of RCW 36, covering an area of ~30' × 30', were carried out with a Fabry-Pérot spectrometer on board a 100-cm balloon-borne far-infrared (IR) telescope with an angular resolution of 90''. Using AKARI an…
A meeting at z ∼ 3: Young massive galaxies and an AGN within 30 kpc of the luminous QSO LBQS 0302-0019
Sander, A. A. C.; Shanks, T.; Husemann, B. +2 more
Context. Contrary to expectations from scenarios of black hole growth driven by galaxy interactions and mergers, dual active galactic nuclei (AGN) with kiloparsec separations are rarely observed and are very difficult to identify, in particular at high redshifts (i.e. z > 2).
Aims: Focussing on the recently discovered dual AGN system LBQS …
Physical modelling of the circumstellar material in the early-type active binary HH Carinae
Bakış, V.; Eker, Z.; Nitschelm, C. +2 more
High-resolution spectra ( $R\sim 48\, 000$ ) of the massive binary system HH Carinae have been analysed. Precise absolute parameters were derived from a simultaneous solution of the radial velocities and the light curves. The primary component is found to be an O9-type main-sequence star with a temperature of 33 500 K, while the secondary componen…