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Central kiloparsec region of Andromeda. I. Dynamical modelling
Lucie Cros, Françoise Combes, Anne-Laure Melchior +1
The Andromeda galaxy (M31) is the most nearby giant spiral galaxy, an opportunity to study with high resolution dynamical phenomena occurring in nuclear disks and bulges, able to e…
Compact and High Excitation Molecular Clumps in the Extended Ultraviolet Disk of M83
Jin Koda, Francoise Combes, Monica Rubio +9
The extended ultraviolet (XUV) disks of nearby galaxies show ongoing massive star formation, but their parental molecular clouds remain mostly undetected despite searches in CO(1-0…
A FUV and optical study of star formation in closely interacting galaxies: star forming rings, tidal arms and nuclear outflows
Jyoti Yadav, Mousumi Das, Sudhanshu Barway +1
We present a study of the morphology of star formation and the associated nuclear activity in a sample of 8 closely interacting southern galaxies, which are in different stages of…
Constraining the LyC escape fraction from LEGUS star clusters with SIGNALS HII region observations: A pilot study of NGC 628
J. W. Teh, K. Grasha, M. R. Krumholz +23
The ionising radiation of young and massive stars is a crucial form of stellar feedback. Most ionising (Lyman-continuum; LyC, ) photons are absorbed close to the stars tha…
The Nature of the Motions of Multiphase Filaments in the Centers of Galaxy Clusters
Shalini Ganguly, Yuan Li, Valeria Olivares +6
The intracluster medium (ICM) in the centers of galaxy clusters is heavily influenced by the ``feedback'' from supermassive black holes (SMBHs). Feedback can drive turbulence in th…
Feedback in the merging galaxy group NGC6338
Gerrit Schellenberger, Ewan O'Sullivan, Simona Giacintucci +6
The galaxy group NGC6338 is one of the most violent group-group mergers known to date. While the central dominant galaxies rush at each other at 1400km/s along the line of sight, w…
Galactic bulge-black hole co-evolution, feeding and feedback of AGNs
Francoise Combes
Since the 1990s, we have known that there is a super-massive black hole in every galaxy, and that its mass is proportional to the mass of the bulge. To better understand how these…
Spiral Galaxies
Francoise Combes
Our vision of galaxies has changed significantly since the era of large galaxy surveys like the Sloan, which gave us extensive statistics with millions of galaxies. The Hubble sequ…
Molecular gas cloud properties at revealed by the superb angular resolution achieved with ALMA and gravitational lensing
Miroslava Dessauges-Zavadsky, Johan Richard, Françoise Combes +6
Current observations favour that the massive ultraviolet-bright clumps with a median stellar mass of , ubiquitously observed in galaxies, are star-…
Discovery of Hydrogen Radio Recombination Lines at z=0.89 towards PKS 1830-211
Kimberly L. Emig, Neeraj Gupta, Pedro Salas +14
We report the detection of stimulated hydrogen radio recombination line (RRL) emission from ionized gas in a galaxy using 580--1670 MHz observations from the MeerKAT Absor…
Radio jet-ISM interaction and positive radio-mechanical feedback in Abell 1795
Prathamesh D. Tamhane, Brian R. McNamara, Helen R. Russell +8
We present XSHOOTER observations with previous ALMA, MUSE and observations to study the nature of radio-jet triggered star formation and the interaction of radio jets with th…
The origin of double-peak emission-line galaxies: rotating discs, bars or galaxy mergers?
Daniel Maschmann, Anaelle Halle, Anne-Laure Melchior +2
Emission lines with a double-peak (DP) shape, detected in the centre of galaxies, have been extensively used in the past to identify peculiar kinematics such as dual active galacti…
Tracing the kinematics of the whole ram pressure stripped tails in ESO 137-001
Rongxin Luo, Ming Sun, Pavel Jáchym +8
Ram pressure stripping (RPS) is an important process to affect the evolution of cluster galaxies and their surrounding environment. We present a large MUSE mosaic for ESO 137-001 a…
Barbell-shaped giant radio galaxy with ~100 kpc kink in the jet
Pratik Dabhade, Timothy W. Shimwell, Joydeep Bagchi +8
We present for the first time a study of peculiar giant radio galaxy (GRG) J223301+131502 using deep multi-frequency radio observations from GMRT (323, 612, and 1300 MHz) and LOFAR…
First Detection of the Molecular Cloud Population in the Extended Ultraviolet (XUV) Disk of M83
Jin Koda, Linda Watson, Francoise Combes +8
We report a CO(3-2) detection of 23 molecular clouds in the extended ultraviolet (XUV) disk of the spiral galaxy M83 with ALMA. The observed 1kpc^2 region is at about 1.24 times th…
Halo heating from fluctuating gas in a model dwarf
Mahmoud Hashim, Amr El-Zant, Jonathan Freundlich +2
The cold dark matter (CDM) structure formation scenario faces challenges on (sub)galactic scales, central among them being the `cusp-core' problem. A known remedy, driving CDM out…
Multiply lensed star forming clumps in the A521-sys1 galaxy at redshift 1
Matteo Messa, Miroslava Dessauges-Zavadsky, Johan Richard +6
We study the population of star-forming clumps in A521-sys1, a system gravitationally lensed by the foreground () cluster Abell 0521. The galaxy presents o…
Extended far-ultraviolet emission in distant dwarf galaxies
Anshuman Borgohain, Kanak Saha, Bruce Elmegreen +3
Blue Compact Dwarfs (BCDs) are low-luminosity (M mag), metal-poor ( ), centrally concentrated galaxies with bright clumps…
Emergence of a new HI 21-cm absorption component at z~1.1726 towards the gamma-ray blazar PKS~2355-106
Raghunathan Srianand, Neeraj Gupta, Patrick Petitjean +12
We report the emergence of a new HI 21-cm absorption at z_abs = 1.172635 in the damped Lyman-alpha absorber (DLA) towards the gamma-ray blazar PKS 2355-106 (z_em~1.639) using scien…
Molecular gas dynamics around nuclei of galaxies
Francoise Combes
Recent molecular line observations with ALMA in several nearby Seyferts have revealed the existence of molecular tori, and the nature of gas flows at 10-20~pc scale. At 100~pc scal…
ALMA imaging of the cold molecular and dusty disk in the type 2 active nucleus of the Circinus galaxy
Konrad R. W. Tristram, C. M. Violette Impellizzeri, Zhi-Yu Zhang +9
We aim to shed light on the physical properties and kinematics of the molecular material in the nucleus of one of the closest type 2 active galaxies. To this end, we obtained high…
ALMA Lensing Cluster Survey: ALMA-Herschel Joint Study of Lensed Dusty Star-Forming Galaxies across
Fengwu Sun, Eiichi Egami, Seiji Fujimoto +25
We present an ALMA-Herschel joint analysis of sources detected by the ALMA Lensing Cluster Survey (ALCS) at 1.15 mm. Herschel/PACS and SPIRE data at 100-500 m are deblended for…
Discovery of a damped Ly absorber originating in a spectacular interacting dwarf galaxy pair at
Erin Boettcher, Neeraj Gupta, Hsiao-Wen Chen +18
We present the discovery of neutral gas detected in both damped Ly absorption (DLA) and HI 21-cm emission outside of the stellar body of a galaxy, the first such detection in th…
Hidden in Plain Sight: UVIT and MUSE Discovery of a Large, Diffuse Star-Forming Galaxy
Jyoti Yadav, Mousumi Das, Sudhanshu Barway +1
We report the discovery of a nearby large, diffuse galaxy that shows star formation, using Ultra Violet Imaging Telescope (UVIT) far-UV observations, archival optical data from Mul…