F. L. Polles
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View article: H$α$-X-ray Surface Brightness Correlation for Filaments in Cooling Flow Clusters
H$α$-X-ray Surface Brightness Correlation for Filaments in Cooling Flow Clusters Open
Massive galaxies in cooling flow clusters display clear evidence of feedback from Active Galactic Nuclei (AGN). Joint X-ray and radio observations have shown that AGN radio jets push aside the surrounding hot gas and form cavities in the h…
View article: Electron Density Distribution in H ii Regions in IC 10
Electron Density Distribution in H ii Regions in IC 10 Open
We present the [O III ] λ 52 μ m map of the dwarf galaxy IC 10 obtained with the Field-Imaging Far-Infrared Line Spectrometer on board the Stratospheric Observatory for Infrared Astronomy. We combine the [O III ] λ 52 μ m map with Herschel…
View article: Absorption and Self-absorption of [C ii] and [O i] Far Infrared Lines toward a Bright Bubble in the Nessie Infrared Dark Cloud
Absorption and Self-absorption of [C ii] and [O i] Far Infrared Lines toward a Bright Bubble in the Nessie Infrared Dark Cloud Open
Using the upGREAT instrument on board the Stratospheric Observatory for Infrared Astronomy, we imaged [C ii ] 157.74 and [O i ] 63.18 μ m line emission from a bright photodissociation region (PDR) associated with an ionized bubble located …
View article: Absorption and Self-Absorption of [C II] and [O I] Far Infrared Lines Towards a Bright Bubble in the Nessie Infrared Dark Cloud
Absorption and Self-Absorption of [C II] and [O I] Far Infrared Lines Towards a Bright Bubble in the Nessie Infrared Dark Cloud Open
Using the upGREAT instrument on SOFIA, we have imaged [C II] 157.74 and [O I] 63.18 micron line emission from a bright photodissociation region (PDR) associated with an ionized ``bubble'' located in the Nessie Nebula, a filamentary infrare…
View article: Shock Enhanced [C ii] Emission from the Infalling Galaxy Arp 25 <sup>∗</sup>
Shock Enhanced [C ii] Emission from the Infalling Galaxy Arp 25 <sup>∗</sup> Open
We present SOFIA observations with HAWC+ and FIFI-LS of the peculiar galaxy Arp 25, also known as NGC 2276 or UGC 3740, whose morphology is deformed by its impact with the intragroup medium of the NGC 2300 galaxy group. These observations …
View article: The SOFIA FEEDBACK [CII] Legacy Survey: Rapid molecular cloud dispersal in RCW 79
The SOFIA FEEDBACK [CII] Legacy Survey: Rapid molecular cloud dispersal in RCW 79 Open
It has long been discussed whether stellar feedback in the form of winds and/or radiation can shred the nascent molecular cloud, thereby controlling the star formation rate. However, directly probing and quantifying the impact of stellar f…
View article: Shock enhanced [CII] emission from the infalling galaxy Arp 25
Shock enhanced [CII] emission from the infalling galaxy Arp 25 Open
We present SOFIA observations with HAWC+ and FIFI-LS of the peculiar galaxy Arp 25, also known as NGC 2276 or UGC 3740, whose morphology is deformed by its impact with the intra-group medium of the NGC 2300 galaxy group. These observations…
View article: The SOFIA FEEDBACK Legacy Survey: Rapid molecular cloud dispersal in RCW 79
The SOFIA FEEDBACK Legacy Survey: Rapid molecular cloud dispersal in RCW 79 Open
It has long been discussed whether stellar feedback in the form of winds and/or radiation can shred the nascent molecular cloud, thereby controlling the star formation rate. However, directly probing and quantifying the impact of stellar f…
View article: Hα and X-ray Surface Brightness Correlation ofFilaments in Cooling Flow Clusters
Hα and X-ray Surface Brightness Correlation ofFilaments in Cooling Flow Clusters Open
Massive galaxies in cooling flow clusters display clear evidence of feedback from Active Galactic Nuclei (AGN). Joint X-ray and radio observations have shown that AGN radio jets push aside the surrounding hot gas and form cavities in the h…
View article: Inferring the HII region escape fraction of ionizing photons from infrared emission lines in metal-poor star-forming dwarf galaxies
Inferring the HII region escape fraction of ionizing photons from infrared emission lines in metal-poor star-forming dwarf galaxies Open
Local metal-poor galaxies stand as ideal laboratories for probing the properties of the interstellar medium (ISM) in chemically unevolved conditions. Detailed studies of this primitive ISM can help gain insights into the physics of the fir…
View article: AGN jets do not prevent the suppression of conduction by the heat buoyancy instability in simulated galaxy clusters
AGN jets do not prevent the suppression of conduction by the heat buoyancy instability in simulated galaxy clusters Open
Centres of galaxy clusters must be efficiently reheated to avoid a cooling catastrophe. One potential reheating mechanism is anisotropic thermal conduction, which could transport thermal energy from intermediate radii to the cluster centre…
View article: Cosmic rays and thermal instability in self-regulating cooling flows of massive galaxy clusters
Cosmic rays and thermal instability in self-regulating cooling flows of massive galaxy clusters Open
One of the key physical processes that helps prevent strong cooling flows in galaxy clusters is the continued energy input from the central active galactic nucleus (AGN) of the cluster. However, it remains unclear how this energy is therma…
View article: Gas condensation in brightest group galaxies unveiled with MUSE
Gas condensation in brightest group galaxies unveiled with MUSE Open
The origin of the cold gas in central galaxies in groups is still a matter of debate. We present Multi-Unit Spectroscopic Explorer (MUSE) observations of 18 optically selected local ( z ≤ 0.017) brightest group galaxies (BGGs) to study the…
View article: Disentangling emission from star-forming regions in the Magellanic Clouds: Linking [OIII]88 micron and 24 micron
Disentangling emission from star-forming regions in the Magellanic Clouds: Linking [OIII]88 micron and 24 micron Open
This study explores the link between the [OIII]88mu emission, a well-known tracer of HII regions, and 24mu continuum, often used to trace warm dust in the ionized phases of galaxies. We investigate the local conditions driving the relation…
View article: Disentangling emission from star-forming regions in the Magellanic Clouds: Linking [O iii]<i>λ</i>88 µm and 24 µm
Disentangling emission from star-forming regions in the Magellanic Clouds: Linking [O iii]<i>λ</i>88 µm and 24 µm Open
Context . The [O iii ] λ 88 µm line is observed in many galaxies including our neighboring Magellanic Clouds and is a well-known tracer of H ii regions, while the 24 µm continuum emission has often been used to trace warm dust in the ioniz…
View article: AGN jets do not prevent the suppression of conduction by the heat buoyancy instability in simulated galaxy clusters
AGN jets do not prevent the suppression of conduction by the heat buoyancy instability in simulated galaxy clusters Open
Centres of galaxy clusters must be efficiently reheated to avoid a cooling catastrophe. One potential reheating mechanism is anisotropic thermal conduction, which could transport thermal energy from intermediate radii to the cluster center…
View article: AGN jets do not prevent the suppression of conduction by the heat buoyancy instability in simulated galaxy clusters
AGN jets do not prevent the suppression of conduction by the heat buoyancy instability in simulated galaxy clusters Open
Centres of galaxy clusters must be efficiently reheated to avoid a cooling catastrophe. One potential reheating mechanism is anisotropic thermal conduction, which could transport thermal energy from intermediate radii to the cluster center…
View article: Excitation mechanisms in the intracluster filaments surrounding brightest cluster galaxies
Excitation mechanisms in the intracluster filaments surrounding brightest cluster galaxies Open
Context. The excitation of the filamentary gas structures surrounding giant elliptical galaxies at the center of cool-core clusters, also known as brightest cluster galaxies (BCGs), is key to our understanding of active galactic nucleus (A…
View article: Tracing the total molecular gas in galaxies: [CII] and the CO-dark gas
Tracing the total molecular gas in galaxies: [CII] and the CO-dark gas Open
Context. Molecular gas is a necessary fuel for star formation. The CO (1−0) transition is often used to deduce the total molecular hydrogen but is challenging to detect in low-metallicity galaxies in spite of the star formation taking plac…
View article: DeGaS-MC: Dense Gas Survey in the Magellanic Clouds
DeGaS-MC: Dense Gas Survey in the Magellanic Clouds Open
Context. Understanding the star-forming processes is key to understanding the evolution of galaxies. Investigating star formation requires precise knowledge of the properties of the dense molecular gas complexes where stars form and a quan…
View article: DeGaS-MC: Dense Gas Survey in the Magellanic Clouds I -- An APEX survey of HCO+ and HCN(2-1) toward the LMC and SMC
DeGaS-MC: Dense Gas Survey in the Magellanic Clouds I -- An APEX survey of HCO+ and HCN(2-1) toward the LMC and SMC Open
Investigating star formation requires precise knowledge of the properties of the dense molecular gas. The low metallicity and wide range of star formation activity of the Large and Small Magellanic Clouds make them prime laboratories to st…
View article: The CO-dark molecular gas mass in 30 Doradus
The CO-dark molecular gas mass in 30 Doradus Open
Determining the efficiency with which gas is converted into stars in galaxies requires an accurate determination of the total reservoir of molecular gas mass. However, despite being the most abundant molecule in the Universe, H2 is challen…
View article: Physical conditions in the gas phases of the giant H II region LMC-N 11
Physical conditions in the gas phases of the giant H II region LMC-N 11 Open
Context. The ambiguous origin of the [C II ] 158 μ m line in the interstellar medium complicates its use for diagnostics concerning the star-formation rate and physical conditions in photodissociation regions. Aims. We investigate the orig…
View article: Physical conditions in the gas phases of the giant HII region LMC-N11:\n II. Origin of [CII] and fraction of CO-dark gas
Physical conditions in the gas phases of the giant HII region LMC-N11:\n II. Origin of [CII] and fraction of CO-dark gas Open
(abridged) The ambiguous origin of [CII] 158um in the interstellar medium\ncomplicates its use for diagnostics concerning the star-formation rate and\nphysical conditions in photodissociation regions (PDRs). We observed the giant\nHII regi…
View article: Dense gas formation and destruction in a simulated Perseus-like galaxy cluster with spin-driven black hole feedback
Dense gas formation and destruction in a simulated Perseus-like galaxy cluster with spin-driven black hole feedback Open
Context. Extended filamentary H α emission nebulae are a striking feature of nearby galaxy clusters but the formation mechanism of the filaments, and the processes which shape their morphology remain unclear. Aims. We conduct an investigat…
View article: The <i>Herschel</i> Dwarf Galaxy Survey
The <i>Herschel</i> Dwarf Galaxy Survey Open
The sensitive infrared telescopes, Spitzer and Herschel , have been used to target low-metallicity star-forming galaxies, allowing us to investigate the properties of their interstellar medium (ISM) in unprecedented detail. Interpretation …
View article: The Herschel Dwarf Galaxy Survey: II. Physical conditions, origin of [CII] emission, and porosity of the multiphase low-metallicity ISM
The Herschel Dwarf Galaxy Survey: II. Physical conditions, origin of [CII] emission, and porosity of the multiphase low-metallicity ISM Open
The sensitive infrared telescopes, Spitzer and Herschel, have been used to target low-metallicity star-forming galaxies, allowing us to investigate the properties of their interstellar medium (ISM) in unprecedented detail. Interpretation o…
View article: The Herschel Dwarf Galaxy Survey: II. Physical conditions, origin of [CII] emission, and porosity of the multiphase low-metallicity ISM
The Herschel Dwarf Galaxy Survey: II. Physical conditions, origin of [CII] emission, and porosity of the multiphase low-metallicity ISM Open
The sensitive infrared telescopes, Spitzer and Herschel, have been used to target low-metallicity star-forming galaxies, allowing us to investigate the properties of their interstellar medium (ISM) in unprecedented detail. Interpretation o…
View article: Discovery of a diffuse optical line emitting halo in the core of the Centaurus cluster of galaxies: line emission outside the protection of the filaments
Discovery of a diffuse optical line emitting halo in the core of the Centaurus cluster of galaxies: line emission outside the protection of the filaments Open
We present the discovery of diffuse optical line emission in the Centaurus cluster seen with the MUSE (Multi Unit Spectroscopic Explorer) integral field unit. The unparalleled sensitivity of MUSE allows us to detect the faint emission from…