N. Falstad
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View article: An Imaging and Spectroscopic Exploration of the Dusty Compact Obscured Nucleus Galaxy Zw 049.057*
An Imaging and Spectroscopic Exploration of the Dusty Compact Obscured Nucleus Galaxy Zw 049.057* Open
Zw 049.057 is a moderate-mass, dusty, early-type galaxy that hosts a powerful compact obscured nucleus (CON, L FIR,CON ≥ 10 11 L ⊙ ). The resolution of the Hubble Space Telescope enabled measurements of the stellar light distribution and c…
View article: A spectacular galactic scale magnetohydrodynamic powered wind in ESO 320-G030
A spectacular galactic scale magnetohydrodynamic powered wind in ESO 320-G030 Open
How galaxies regulate nuclear growth through gas accretion by supermassive black holes (SMBHs) is one of the most fundamental questions in galaxy evolution. One potential way to regulate nuclear growth is through a galactic wind that remov…
View article: CONfirm: A Spectacular Galactic Scale MHD Powered Wind in ESO~320-G030
CONfirm: A Spectacular Galactic Scale MHD Powered Wind in ESO~320-G030 Open
One of the most fundamental questions in galaxy evolution is how galaxies regulate nuclear growth and accretion onto supermassive black holes. One potential way to do this is through a galactic wind which removes gas from the nucleus. It i…
View article: Discovery of methanimine (CH<sub>2</sub>NH) megamasers toward compact obscured galaxy nuclei
Discovery of methanimine (CH<sub>2</sub>NH) megamasers toward compact obscured galaxy nuclei Open
We present the first search for the 5.29 GHz methanimine (CH 2 NH) 1 10 − 1 11 transition toward a sample of galaxy nuclei. We target seven galaxies that host compact obscured nuclei (CONs) with the Karl G. Jansky Very Large Array. These g…
View article: Discovery of Methanimine Megamasers Toward Compact Obscured Galaxy Nuclei
Discovery of Methanimine Megamasers Toward Compact Obscured Galaxy Nuclei Open
We present the first search for the 5.29 GHz methanimine($\rm{CH}_2\rm{NH}$) $1_{10}-1_{11}$ transition toward a sample of galaxy nuclei. We target seven galaxies that host Compact Obscured Nuclei (CONs) with the Karl G. Jansky Very Large …
View article: CON-quest
CON-quest Open
Context. Some luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) host extremely compact ( r < 100 pc) and dusty nuclei. The high extinction associated with large column densities of gas and dust toward these objects render the…
View article: VV 655 and NGC 4418: Implications of an interaction for the evolution of a LIRG
VV 655 and NGC 4418: Implications of an interaction for the evolution of a LIRG Open
Context. VV 655, a dwarf irregular galaxy with HI tidal debris, is a companion to the lenticular luminous infrared galaxy (LIRG) NGC 4418. NGC 4418 stands out among nearby LIRGs due to its dense central concentration of molecular gas and t…
View article: The hidden heart of the luminous infrared galaxy IC 860
The hidden heart of the luminous infrared galaxy IC 860 Open
High-resolution (0.″03–0.″09 (9–26 pc)) ALMA (100–350 GHz ( λ 3 to 0.8 mm)) and (0.″04 (11 pc)) VLA 45 GHz measurements have been used to image continuum and spectral line emission from the inner (100 pc) region of the nearby infrare…
View article: Extremely obscured galaxy nuclei — hidden AGNs and extreme starbursts
Extremely obscured galaxy nuclei — hidden AGNs and extreme starbursts Open
Understanding the evolution of galaxies and galaxy nuclei requires studying the extremely obscured activity that has recently been uncovered using submm facilities. Properly interpreting these observations requires advances in the radio, m…
View article: The hidden heart of the luminous infrared galaxy IC 860 I. A molecular inflow feeding opaque, extreme nuclear activity
The hidden heart of the luminous infrared galaxy IC 860 I. A molecular inflow feeding opaque, extreme nuclear activity Open
High-resolution (0."03 - 0."09) (9 - 26 pc)) ALMA (100 - 350 GHz (3 - 0.8 mm)) and VLA 45 GHz measurements have been used to image continuum and spectral line emission from the inner region of the nearby infrared luminous galaxy IC 860. We…
View article: Molecular gas in the northern nucleus of Mrk 273: Physical and chemical properties of the disc and its outflow
Molecular gas in the northern nucleus of Mrk 273: Physical and chemical properties of the disc and its outflow Open
Aiming to characterise the properties of the molecular gas in the ultra-luminous infrared galaxy Mrk 273 and its outflow, we used the NOEMA interferometer to image the dense-gas molecular tracers HCN, HCO + , HNC, HOC + and HC 3 N at ∼86 G…
View article: Hidden molecular outflow in the LIRG Zw 049.057
Hidden molecular outflow in the LIRG Zw 049.057 Open
Context. Feedback in the form of mass outflows driven by star formation or active galactic nuclei is a key component of galaxy evolution. The luminous infrared galaxy Zw 049.057 harbours a compact obscured nucleus with a possible far-infra…
View article: Luminous, pc-scale CO 6−5 emission in the obscured nucleus of NGC 1377
Luminous, pc-scale CO 6−5 emission in the obscured nucleus of NGC 1377 Open
High resolution submm observations are important in probing the morphology,\ncolumn density and dynamics of obscured active galactic nuclei (AGNs). With\nhigh resolution (0.06 x 0.05) ALMA 690 GHz observations we have found bright\n(TB >80…
View article: Molecular Outflows in Local ULIRGs: Energetics from Multitransition OH Analysis
Molecular Outflows in Local ULIRGs: Energetics from Multitransition OH Analysis Open
We report on the energetics of molecular outflows in 14 local ultraluminous infrared galaxies (ULIRGs) that show unambiguous outflow signatures (P Cygni profiles or high-velocity absorption wings) in the far-infrared lines of OH measured w…
View article: Molecular observations of obscured galaxy nuclei
Molecular observations of obscured galaxy nuclei Open
It is becoming evident that some (ultra)luminous infrared galaxies ((U)LIRGs) contain compact obscured nuclei (CONs) where luminosities in excess of 10^9 L☉ emerge from inside dusty regions smaller than 100 pc in diameter. Due to the obscu…
View article: Inflowing gas onto a compact obscured nucleus in Arp 299A
Inflowing gas onto a compact obscured nucleus in Arp 299A Open
\n Aims. We probe the physical conditions in the core of Arp 299A and try to put constraints on the nature of its nuclear power source.\n Methods. We used Herschel Space Observatory far-infrared and submillimeter observations of H2O and OH…
View article: Inflowing gas onto a compact obscured nucleus in Arp 299A: Herschel spectroscopic studies of H2O and OH
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…
View article: Submillimeter H<sub>2</sub>O and H<sub>2</sub>O<sup>+</sup>emission in lensed ultra- and hyper-luminous infrared galaxies at<i>z</i> ~ 2–4
Submillimeter H<sub>2</sub>O and H<sub>2</sub>O<sup>+</sup>emission in lensed ultra- and hyper-luminous infrared galaxies at<i>z</i> ~ 2–4 Open
We report rest-frame submillimeter H2O emission line observations of 11 ultra- or hyper-luminous infrared galaxies (ULIRGs or HyLIRGs) at z ~ 2–4 selected among the brightest lensed galaxies discovered in the Herschel-Astrophysical Teraher…
View article: Herschel spectroscopic observations of Zw 049.057 and Arp 299a
Herschel spectroscopic observations of Zw 049.057 and Arp 299a Open
The presence of compact obscured nuclei in luminous infrared galaxies (LIRGs) is very well probed by the detection of highly excited absorption lines of OH and H 2 O in the far-infrared (far-IR), which require warm and optically thick dust…
View article: HIGH-LYING OH ABSORPTION, [C II] DEFICITS, AND EXTREME<i>L</i><sub>FIR</sub>/<i>M</i><sub>H2</sub>RATIOS IN GALAXIES
HIGH-LYING OH ABSORPTION, [C II] DEFICITS, AND EXTREME<i>L</i><sub>FIR</sub>/<i>M</i><sub>H2</sub>RATIOS IN GALAXIES Open
Herschel/PACS observations of 29 local (Ultra-)Luminous Infrared Galaxies, including both starburst and AGN-dominated sources as diagnosed in the mid-infrared/optical, show that the equivalent width of the absorbing OH 65 um Pi_{3/2} J=9/2…
View article: High-lying OH Absorption, [C II] Deficits, and Extreme LFIR/M H2 Ratios in Galaxies
High-lying OH Absorption, [C II] Deficits, and Extreme LFIR/M H2 Ratios in Galaxies Open
Herschel/PACS observations of 29 local (ultra)luminous infrared galaxies, including both starburst and active galactic nucleus (AGN) dominated sources as diagnosed in the mid-infrared/optical, show that the equivalent width of the absorbin…