25 research outputs found
Walk on the Low Side: LOFAR explores the low-frequency radio emission of GASP jellyfish galaxies
Jellyfish galaxies, characterized by long filaments of stripped interstellar
medium extending from their disks, are the prime laboratories to study the
outcomes of ram pressure stripping. At radio wavelengths, they often show
unilateral emission extending beyond the stellar disk, and an excess of radio
luminosity with respect to that expected from their current star formation
rate. We present new 144 MHz images provided by the LOFAR Two-metre Sky Survey
for a sample of six galaxies from the GASP survey. These galaxies are
characterized by a high global luminosity at 144 MHz ( W
Hz), in excess compared to their ongoing star formation rate. The
comparison of radio and H images smoothed with a Gaussian beam
corresponding to 10 kpc reveals a sub-linear spatial correlation between
the two emissions with an average slope . In their stellar disk we
measure , which is close to the radio-to-star formation linear
relation. We speculate that, as a consequence of the ram pressure, in these
jellyfish galaxies the cosmic rays transport is more efficient than in normal
galaxies. Radio tails typically have higher radio-to-H ratios than the
disks, thus we suggest that the radio emission is boosted by the electrons
stripped from the disks. In all galaxies, the star formation rate has decreased
by a factor within the last yr. The observed radio emission
is consistent with the past star formation, so we propose that this recent
decline may be the cause of their radio luminosity-to-star formation rate
excess.Comment: 22 pages, 7 figures. Accepted for publication on ApJ on 24/08/202
The role of environment on quenching, star formation and AGN activity
Galaxies undergoing ram pressure stripping in clusters are an excellent
opportunity to study the effects of environment on both the AGN and the star
formation activity. We report here on the most recent results from the GASP
survey. We discuss the AGN-ram pressure stripping connection and some evidence
for AGN feedback in stripped galaxies. We then focus on the star formation
activity, both in the disks and the tails of these galaxies, and conclude
drawing a picture of the relation between multi-phase gas and star formation.Comment: Proceedings of the IAU Symposium 359 "Galaxy evolution and feedback
across different environments", editors T. Storchi-Bergmann, R. Overzier, W.
Forman & R. Riffel - final versio
Continuous printing system
This thesis paper aims to convert a commercial printer to a continuous printer. Commercial printers can be configured in such a way that it can print longer than its usual printing size. However, this does not eliminate the page break feature and printing on continuous paper is not possible.
This research aims to implement a continuous printer that can print images that are of longer length than the usual A4 size paper which is 11 inches in length. A commercial printer is the main machine for our prototype. The program is capable of displaying the image in its display window. Rio6z, when prompted to print, will start the printing process.
A commercial printer is equipped with a microcontroller that regulates and monitors signals. The software, Rio6Z, breaks images that are larger than the maximum limit of the printer into pages. It also displays a preview of the image to be printed. Through the use of the software and the converted commercial printer, printing on continuous papers can be done
Unlocking Internet of Things (IoT) for Enhanced Knowledge Management and Organizational Performance: A Case Study of Diverse Industry Players in the Philippines
Web 3.0 resulted in the increased decentralization of information, especially upon the emergence of the Internet of Things (IoT). IoT has revolutionized data transfer and has since reshaped knowledge management in organizations. This research focuses on how the IoT enables real-time data sharing and its impact on enhancing knowledge management and business processes in various local businesses. The study examines how five Philippine enterprises utilize the IoT through a qualitative embedded cross-case analysis. Several methods, like interviews, focus groups, and questionnaires, helped gather insights into how the IoT influences knowledge management processes. The research follows a case study approach, and the findings reveal that IoT boosts the generation, storage, sharing, and utilization of knowledge, aiding organizations in enhancing operational efficiency and product and service quality, thus improving business processes. Further, the research offers insights into the IoT possibilities. It provides practical recommendations for seamless integration through the companies' capabilities that enhance their knowledge management and operational results, gaining insights for strategic implementation
Evidence for Mixing between ICM and Stripped ISM by the Analysis of the Gas Metallicity in the Tails of Jellyfish Galaxies
none14noneAndrea Franchetto; Stephanie Tonnesen; Bianca M. Poggianti; Benedetta Vulcani; Marco Gullieuszik; Alessia Moretti; Rory Smith; Alessandro Ignesti; Cecilia Bacchini; Sean McGee; Neven Tomičić; Matilde Mingozzi; Anna Wolter; Ancla MüllerFranchetto, Andrea; Tonnesen, Stephanie; Poggianti, Bianca M.; Vulcani, Benedetta; Gullieuszik, Marco; Moretti, Alessia; Smith, Rory; Ignesti, Alessandro; Bacchini, Cecilia; Mcgee, Sean; Tomičić, Neven; Mingozzi, Matilde; Wolter, Anna; Müller, Ancl
GASP XXXIX: MeerKAT hunts Jellyfish in A2626
We present MeerKAT H I observations of six jellyfish candidate galaxies (JFCGs) in the galaxy cluster, A2626. Two of the six galaxies JW100 and JW103, which were identified as JFCGs from B-band images, are confirmed as jellyfish galaxies (JFGs). Both of the JFGs have low H I content, reside in the cluster core, and move at very high velocities (~ 3σcl). The other JFCGs, identified as non-jellyfish galaxies, are H I rich, with H I morphologies revealing warps, asymmetries, and possible tidal interactions. Both the A2626 JFGs and three other confirmed JFGs from the GASP sample show that these galaxies are H I stripped but not yet quenched. We detect H I, H α, and CO(2-1) tails of similar extent (~50 kpc) in JW100. Comparing the multiphase velocity channels, we do not detect any H I or CO(2-1) emission in the northern section of the tail where H α emission is present, possibly due to prolonged interaction between the stripped gas and the intracluster medium. We also observe an anticorrelation between H I and CO(2-1), which hints at an efficient conversion of H I to H2 in the southern part of the tail. We find that both ram-pressure stripping and H I-to-H2 conversion are significant depletion channels for atomic gas. H I-to-H2 conversion is more efficient in the disc than in the tail