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The multi-phase ISM in the nearby composite AGN-SB galaxy NGC 4945: large-scale (parsecs) mechanical heating
Weiss, A.; Martín-Pintado, J.; van der Werf, P. P. +8 more
Context. Understanding the dominant heating mechanism in the nuclei of galaxies is crucial to understanding star formation in starbursts (SBs), active galactic nuclei (AGN) phenomena, and the relationship between star formation and AGN activity in galaxies. Analysis of the carbon monoxide (12CO) rotational ladder versus the infrared con…
Orbits and Structure of the Quadruple Systems GJ 225.1 and FIN 332
Tokovinin, A.
Only a handful of quadruple systems with two accurate inner visual orbits are known. The architecture of two such systems is studied here to determine the period ratios, mutual orbit orientation, and other parameters; updated orbital elements and their errors are derived. Gliese 225.1 (HIP 28442) is composed of three K-type and one M-type dwarfs a…
Gaia: The Galaxy in six (and more) dimensions
Pancino, Elena
The ESA cornerstone mission Gaia was successfully launched in 2013, and is now scanning the sky to accurately measure the positions and motions of about two billion point-like sources of 3 ≲ V ≲ 20.5 mag, with the main goal of reconstructing the 6D phase space structure of the Milky Way. The typical uncertainties in the astrometry will be in the r…
Open Universe survey of Swift-XRT GRB fields: Flux-limited sample of HBL blazars
D'Elia, V.; Giommi, P.; Pollock, A. M. T. +22 more
Aims: The sample of serendipitous sources detected in all Swift-XRT images pointing at gamma ray bursts (GRBs) constitutes the largest existing medium-deep survey of the X-ray sky. To build such dataset we analysed all Swift X-ray images centred on GRBs and observed over a period of 15 years using automatic tools that do not require any exper…
Possible detection of a new cyclotron feature in 4U 1700-37
Roy, Jayashree; Bhattacharya, Dipankar; Bala, Suman
We present a spectral and timing study of the high-mass X-ray binary transient source 4U 1700-37 using NuSTAR and ASTROSAT/LAXPC. The source is observed in two different flux states. A combined spectral analysis of NuSTAR's focal plane modules A and B shows the possible hint of a cyclotron line feature at ∼16 keV. The line feature is consistently …
Recovering variable stars in large surveys: EAup Algol-type class in the Catalina Survey
Drake, A. J.; Papageorgiou, A.; Catelan, M. +5 more
The discovery and characterization of Algol eclipsing binaries (EAs) provide an opportunity to contribute for a better picture of the structure and evolution of low-mass stars. However, the cadence of most current photometric surveys hinders the detection of EAs since the separation between observations is usually larger than the eclipse(s) durati…
Discovery of radio jets in the Phoenix galaxy cluster center
Kohno, Kotaro; Oguri, Masamune; Kawabe, Ryohei +6 more
We report the results of the Australia Telescope Compact Array (ATCA) 15 mm observation of the Phoenix galaxy cluster possessing an extreme star-burst brightest cluster galaxy (BCG) at the cluster center. We spatially resolved radio emission around the BCG, and found diffuse bipolar and bar-shape structures extending from the active galactic nucle…
A New Metal-poor Globular Cluster and Resolved Stars in the Outer Disk of the Black Eye Galaxy M64: Implication for the Origin of the Type III Disk Break
Lee, Myung Gyoon; Kang, Jisu; Jang, In Sung +1 more
M64 is a nearby spiral galaxy with a Type III antitruncation component. To trace the origin of the Type III component, we present Hubble Space Telescope/Advanced Camera for Surveys (ACS) F606W/F814W photometry of resolved stars in a field located in the outer disk ( $2\buildrel{\,\prime}\over{.} 5\lesssim r\lesssim 6\buildrel{\,\prime}\over{.} 5$ …
Spectrophotometric characterization of the Philae landing site and surroundings with the Rosetta/OSIRIS cameras
Sierks, H.; Güttler, C.; Barucci, M. A. +5 more
We investigate Abydos, the final landing site of the Philae lander after its eventful landing from the Rosetta spacecraft on comet 67P/Churyumov-Gerasimenko on 2014 November 12. Over 1000 OSIRIS-level 3B images were analysed, which cover the 2014 August-2016 September timeframe, with spatial resolution ranging from 7.6 m pixel-1 to appr…
First Results from a Panchromatic HST/WFC3 Imaging Study of the Young, Rapidly Evolving Planetary Nebulae NGC 7027 and NGC 6302
Frank, Adam; Balick, Bruce; Kastner, Joel H. +3 more
We present the first results from comprehensive, near-UV-to-near-IR Hubble Space Telescope Wide Field Camera 3 (WFC3) emission-line imaging studies of two young planetary nebulae (PNe), NGC 7027 and NGC 6302. These two objects represent key sources for purposes of understanding PNe shaping processes. Both nebulae feature axisymmetric and point-sym…