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The Chandra View of NGC 4178: The Lowest Mass Black Hole in a Bulgeless Disk Galaxy?
Cheung, C. C.; Böker, T.; Secrest, N. J. +3 more
Using high-resolution Chandra data, we report the presence of a weak X-ray point source coincident with the nucleus of NGC 4178, a late-type bulgeless disk galaxy known to have high-ionization mid-infrared (mid-IR) lines typically associated with active galactic nuclei (AGNs). Although the faintness of this source precludes a direct spectral analy…
Unusual quasars from the Sloan Digital Sky Survey selected by means of Kohonen self-organising maps
Meusinger, H.; Scholz, R. -D.; de Hoon, A. +4 more
Context. Large spectroscopic surveys have discovered very peculiar and hitherto unknown types of active galactic nuclei (AGN). Such rare objects may hold clues to the accretion history of the supermassive black holes at the centres of galaxies.
Aims: We aim to create a sizeable sample of unusual quasars from the unprecedented spectroscopic da…
Evidence for a Wide Range of Ultraviolet Obscuration in z ~ 2 Dusty Galaxies from the GOODS-Herschel Survey
Dickinson, Mark; Daddi, Emanuele; Dey, Arjun +20 more
Dusty galaxies at z ~ 2 span a wide range of relative brightness between rest-frame mid-infrared (8 µm) and ultraviolet wavelengths. We attempt to determine the physical mechanism responsible for this diversity. Dust-obscured galaxies (DOGs), which have rest-frame mid-IR to UV flux density ratios >~ 1000, might be abnormally bright in the…
Fe K emission from active galaxies in the COSMOS field
Sanders, D. B.; Taniguchi, Y.; Salvato, M. +14 more
We present a rest-frame spectral stacking analysis of ~1000 X-ray sources detected in the XMM-COSMOS field to investigate the iron-K line properties of active galaxies beyond redshift z ~ 1. In Type I AGN that have a typical X-ray luminosity of LX ~ 1.5 × 1044 (erg s-1) and z ~ 1.6 the cold Fe K at 6.4 keV is weak …
Aphelion water-ice cloud mapping and property retrieval using the OMEGA imaging spectrometer onboard Mars Express
Bibring, J. -P.; Gondet, B.; Langevin, Y. +8 more
Mapping of the aphelion clouds over the Tharsis plateau and retrieval of their particle size and visible opacity are made possible by the OMEGA imaging spectrometer aboard Mars Express. Observations cover the period from MY26 Ls = 330° to MY29 Ls = 180° and are acquired at various local times, ranging from 8 AM to 6 PM. Cloud…
PAndromeda—First Results from the High-cadence Monitoring of M31 with Pan-STARRS 1
Price, P. A.; Saglia, R. P.; Chambers, K. C. +19 more
The Pan-STARRS 1 (PS1) survey of M31 (PAndromeda) is designed to identify gravitational microlensing events, caused by bulge and disk stars (self-lensing) and by compact matter in the halos of M31 and the Milky Way (halo lensing or lensing by massive compact halo objects). With the 7 deg2 field of view (FOV) of PS1, the entire disk of M…
Valleys, paleolakes and possible shorelines at the Libya Montes/Isidis boundary: Implications for the hydrologic evolution of Mars
Poulet, F.; Jaumann, R.; Hiesinger, H. +5 more
We describe the results of our morphologic, stratigraphic and mineralogic investigations of fluvial landforms, paleolakes and possible shoreline morphologies at the Libya Montes/Isidis Planitia boundary. The landforms are indicative of aqueous activity and standing bodies of water, including lakes, seas and oceans, that are attributed to a complex…
AKARI near-infrared spectroscopy of the aromatic and aliphatic hydrocarbon emission features in the galactic superwind of M 82
Onaka, T.; Kaneda, H.; Minh, Y. C. +4 more
Aims: We investigate the properties of hydrocarbon grains in the galactic superwind of M 82.
Methods: With AKARI, we performed near-infrared (2.5-4.5 µm) spectroscopic observations of 34 regions in M 82 including its northern and southern halos.
Results: Many of the spectra show strong emission at 3.3 µm caused by polycy…
I Zw 18 as morphological paradigm for rapidly assembling high-z galaxies
Östlin, G.; Papaderos, P.
Context.
"TNOs are Cool": A survey of the trans-Neptunian region. VII. Size and surface characteristics of (90377) Sedna and 2010 EK139
Hartogh, P.; Pál, A.; Lellouch, E. +14 more
We present estimates of the basic physical properties (size and albedo) of (90377) Sedna, a prominent member of the detached trans-Neptunian object population and the recently discovered scattered disk object 2010 EK139, based on the recent observations acquired with the Herschel Space Observatory, within the "TNOs are Cool!" key progra…