Megamaser
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CONFIRMATION OF A STAR FORMATION BIAS IN TYPE Ia SUPERNOVA DISTANCES AND ITS EFFECT ON THE MEASUREMENT OF THE HUBBLE CONSTANT Open
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THE MEGAMASER COSMOLOGY PROJECT. VIII. A GEOMETRIC DISTANCE TO NGC 5765b Open
As part of the Megamaser Cosmology Project, here we present a new geometric distance measurement to the megamaser galaxy NGC 5765b. Through a series of very long baseline interferometry observations, we have confirmed the water masers trac…
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Counter-rotation and High-velocity Outflow in the Parsec-scale Molecular Torus of NGC 1068 Open
We present 1.4 pc resolution observations of 256 GHz nuclear radio continuum and HCN (J = 3 → 2) in the molecular torus of NGC 1068. The integrated radio continuum emission has a flat spectrum consistent with free–free emission and resolve…
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NuSTAR observations of water megamaser AGN Open
Aims. We study the connection between the masing disk and obscuring torus in Seyfert 2 galaxies. Methods. We present a uniform X-ray spectral analysis of the high energy properties of 14 nearby megamaser active galactic nuclei observed by …
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THE MEGAMASER COSMOLOGY PROJECT. IX. BLACK HOLE MASSES FOR THREE MASER GALAXIES Open
As part of the Megamaser Cosmology Project, we present VLBI maps of nuclear water masers toward five galaxies. The masers originate in sub-parsec circumnuclear disks. For three of the galaxies, we fit Keplerian rotation curves to estimate …
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THE BLACK HOLE–BULGE MASS RELATION IN MEGAMASER HOST GALAXIES* Open
We present Hubble Space Telescope ( HST ) images for nine megamaser disk galaxies with the primary goal of studying photometric BH-galaxy scaling relations. The megamaser disks provide the highest-precision extragalactic BH mass measuremen…
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The 6-GHz multibeam maser survey – II. Statistical analysis and Galactic distribution of 6668-MHz methanol masers Open
The Methanol Multibeam survey has produced the largest and most complete census of methanol and excited-state hydroxyl masers in the Galaxy to date. Observing the entire Galactic plane visible from the Southern hemisphere for 6668-MHz meth…
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X-Ray Bolometric Corrections for Compton-thick Active Galactic Nuclei Open
We present X-ray bolometric correction factors, (≡ / ), for Compton-thick (CT) active galactic nuclei (AGNs) with the aim of testing AGN torus models, probing orientation effects, and estimating the bolometric output of the most obscured A…
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The Carnegie Chicago Hubble Program: the mid-infrared colours of Cepheids and the effect of metallicity on the CO band-head at 4.6 μm Open
We compare mid-infrared (IR) 3.6 and 4.5 μm Warm Spitzer observations for Cepheids in the Milky Way and the Large and Small Magellanic Clouds. Using models, we explore in detail the effect of the CO rotation–vibration band-head at 4.6 μm o…
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DETECTION OF A METHANOL MEGAMASER IN A MAJOR-MERGER GALAXY Open
We have detected emission from both the 4_1 → 30 E (36.2 GHz) class I and 7_2 → 8_1 E (37.7 GHz) class II methanol transitions toward the center of the closest ultra-luminous infrared galaxy Arp 220. The emission in both methan…
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AN EMBEDDED ACTIVE NUCLEUS IN THE OH MEGAMASER GALAXY IRAS16399–0937 Open
We present a multiwavelength study of the OH Megamaser galaxy (OHMG)\nIRAS16399-0937, based on new HST/ACS F814W and H$\\alpha$+[NII] images and\narchive data from HST, 2MASS, Spitzer, Herschel and the VLA. This system has a\ndouble nucleu…
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SIMULTANEOUS OBSERVATION OF WATER AND CLASS I METHANOL MASERS TOWARD CLASS II METHANOL MASER SOURCES Open
We present a simultaneous single-dish survey of 22 GHz water maser and 44 GHz and 95 GHz class I methanol masers toward 77 6.7 GHz class II methanol maser sources, which were selected from the Arecibo methanol maser Galactic plane survey (…
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A global view on star formation: the GLOSTAR Galactic plane survey Open
The Cygnus X complex is covered by the Global View of Star Formation in the Milky Way (GLOSTAR) survey, an unbiased radio-wavelength Galactic plane survey, in 4–8 GHz continuum radiation and several spectral lines. The GLOSTAR survey obser…
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Accretion disk versus jet orientation in H<sub>2</sub>O megamaser galaxies Open
Context . An essential part of the paradigm describing active galactic nuclei is the alignment between the radio jet and the associated rotation axis of the sub-pc accretion disks. Because of the small linear and angular scales involved, t…
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A compact jet at the infrared heart of the prototypical low-luminosity AGN in NGC 1052 Open
The feeble radiative efficiency characteristic of Low-Luminosity Active Galactic Nuclei (LLAGNs) is ascribed to a sub-Eddington accretion rate, typically at log (Lbol/Ledd) ≲ −3. At the finest angular resolutions that are attainable nowada…
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The emission structure of formaldehyde megamasers Open
The formaldehyde megamaser emission has been mapped for the three host galaxies IC 860, IRAS 15107+0724 and Arp 220. Elongated emission components are found at the nuclear centres of all galaxies with an extent ranging between 30 and 100 p…
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Water masers in Compton-thick AGN Open
Aims. Investigations of H 2 O maser galaxies at X-ray energies reveal that most active galactic nuclei (AGN) associated with water masers are characterized by high levels of absorption. With the aim of finding new maser sources for possibl…
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A systematic observational study of radio properties of H<sub>2</sub>O megamaser Seyfert-2 galaxies Open
A systematic study is performed on radio properties of H$_{2}$O megamaser host Seyfert 2 galaxies, through multi-band radio continuum observations (at 11cm, 6.0 cm, 3.6 cm, 2.0 cm and 1.3 cm) with the Effelsberg 100-m radio telescope withi…
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Water, methanol and dense gas tracers in the local ULIRG Arp 220: results from the new SEPIA Band 5 Science Verification campaign Open
We present a line survey of the ultraluminous infrared galaxy Arp 220, taken with the newly installed SEPIA (Swedish-European Southern Observatory PI receiver for APEX) Band 5 instrument on APEX (Atacama Pathfinder Experiment). We illustra…
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CEPHEID VARIABLES IN THE MASER-HOST GALAXY NGC 4258 Open
We present results of a ground-based survey for Cepheid variables in NGC 4258. This galaxy plays a key role in the Extragalactic Distance Scale due to its very precise and accurate distance determination via VLBI observations of water mase…
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Gemini IFU, VLA, and HST observations of the OH megamaser galaxy IRAS F23199+0123: the hidden monster and its outflow Open
We present Gemini Multi-Object Spectrograph (GMOS) Integral field Unit (IFU), Very Large Array (VLA), and Hubble Space Telescope (HST) observations of the OH megamaser (OHM) galaxy IRAS F23199+0123. Our observations show that this system i…
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THE HYDROXYL–WATER MEGAMASER CONNECTION. I. WATER EMISSION TOWARD OH MEGAMASER HOSTS Open
Questions surround the connection of luminous extragalactic masers to galactic processes. The observation that water and hydroxyl megamasers rarely coexist in the same galaxy has given rise to a hypothesis that the two species appear in di…
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Water megamaser emission in hard X-ray selected AGN Open
Context. Water megamaser emission at 22 GHz has proven to be a powerful tool for astrophysical studies of active galactic nuclei (AGN) because it allows an accurate determination of the mass of the central black hole and of the accretion d…
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Water Masers as an Early Tracer of Star Formation Open
We present a study of the correlation between 22 GHz water maser emission and far-infrared/submillimeter (IR/sub-mm) sources. The generalized linear model (GLM) is used to predict H 2 O maser detection in a particular source with defined p…
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Star formation and gas inflows in the OH megamaser galaxy IRAS03056+2034 Open
We have obtained observations of the OH Megamaser galaxy IRAS03056+0234 using\nGemini Multi-Object Spectrograph (GMOS) Integral Field Unit (IFU), Very Large\nArray (VLA) and Hubble Space Telescope (HST). The HST data reveals spiral arms\nc…
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Simulated Galactic methanol maser distribution to constrain Milky Way parameters Open
\n Context. Using trigonometric parallaxes and proper motions of masers associated with massive young stars, the Bar and Spiral Structure Legacy (BeSSeL) survey has reported the most accurate values of the Galactic parameters so far. The d…
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Class I methanol megamasers: a potential probe of starburst activity and feedback in active galaxies Open
Previous observations have shown that the distribution of 36.2-GHz class I methanol megamaser (MM) emission in Arp 220 is highly correlated with the diffuse X-rays. On this basis it was suggested that methanol MM may be produced either by …
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High-velocity OH megamasers in IRAS 20100−4156: evidence for a supermassive black hole Open
We report the discovery of new, high-velocity narrow-line components of the OH megamaser in IRAS 20100−4156. Results from the Australian Square Kilometre Array Pathfinder (ASKAP)'s Boolardy Engineering Test Array (BETA) and the Australia T…
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Inflowing gas onto a compact obscured nucleus in Arp 299A: Herschel spectroscopic studies of H2O and OH Open
Aims. We probe the physical conditions in the core of Arp 299A and try to put constraints to the nature of its nuclear power source. Methods. We used Herschel Space Observatory far-infrared and submillimeter observations of H2O and OH rota…
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Empirical derivation of the metallicity evolution with time and radius using TNG50 Milky Way and Andromeda analogues Open
Context. Recent works use a linear birth metallicity gradient to estimate the evolution of the [Fe/H] profile in the Galactic disk over time, and infer stellar birth radii ( R birth ) from [Fe/H] and age measurements. These estimates rely …