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A Deep Dive into the NGC 741 Galaxy Group: Insights into a Spectacular Head-tail Radio Galaxy from VLA, MeerKAT, uGMRT, and LOFAR

dc.contributor.authorK. Rajpurohit
dc.contributor.authorE. O’Sullivan
dc.contributor.authorG. Schellenberger
dc.contributor.authorM. Brienza
dc.contributor.authorJ. M. Vrtilek
dc.contributor.authorW. Forman
dc.contributor.authorL. P. David
dc.contributor.authorT. Clarke
dc.contributor.authorA. Botteon
dc.contributor.authorF. Vazza
dc.contributor.authorS. Giacintucci
dc.contributor.authorC. Jones
dc.contributor.authorM. Brüggen
dc.contributor.authorT. W. Shimwell
dc.contributor.authorA. Drabent
dc.contributor.authorF. Loi
dc.contributor.authorS. I. Loubser
dc.contributor.authorK. Kolokythas
dc.contributor.authorI. Babyk
dc.contributor.authorH. J. A. Röttgering
dc.contributor.otherCenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA ; kamlesh.rajpurohit@cfa.harvard.edu
dc.contributor.otherCenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA ; kamlesh.rajpurohit@cfa.harvard.edu
dc.contributor.otherCenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA ; kamlesh.rajpurohit@cfa.harvard.edu
dc.contributor.otherINAF-IRA , via Gobetti 101, 40129 Bologna, Italy
dc.contributor.otherCenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA ; kamlesh.rajpurohit@cfa.harvard.edu
dc.contributor.otherCenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA ; kamlesh.rajpurohit@cfa.harvard.edu
dc.contributor.otherCenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA ; kamlesh.rajpurohit@cfa.harvard.edu
dc.contributor.otherNaval Research Laboratory , 4555 Overlook Avenue SW, Code 7213, Washington, DC 20375, USA
dc.contributor.otherINAF-IRA , via Gobetti 101, 40129 Bologna, Italy
dc.contributor.otherINAF-IRA , via Gobetti 101, 40129 Bologna, Italy; Dipartimento di Fisica e Astronomia, Università di Bologna , via P. Gobetti 93/2, 40129, Bologna, Italy
dc.contributor.otherNaval Research Laboratory , 4555 Overlook Avenue SW, Code 7213, Washington, DC 20375, USA
dc.contributor.otherCenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA ; kamlesh.rajpurohit@cfa.harvard.edu
dc.contributor.otherHamburger Sternwarte, Universität Hamburg , Gojenbergsweg 112, 21029, Hamburg, Germany
dc.contributor.otherASTRON, Netherlands Institute for Radio Astronomy , Oude Hoogeveensedijk 4, 7991 PD, Dwingeloo, The Netherlands; Leiden Observatory, Leiden University , PO Box 9513, NL-2300 RA Leiden, The Netherlands
dc.contributor.otherThüringer Landessternwarte , Sternwarte 5, 07778 Tautenburg, Germany
dc.contributor.otherINAF-Osservatorio Astronomico di Cagliari , Via della Scienza 5, 09047 Selargius, CA, Italy
dc.contributor.otherCentre for Space Research, North-West University , Potchefstroom 2520, South Africa
dc.contributor.otherCentre for Radio Astronomy Techniques and Technologies , Department of Physics and Electronics, Rhodes University, P.O. Box 94, Makhanda 6140, South Africa; South African Radio Astronomy Observatory , Black River Park North, 2 Fir Street, Cape Town, 7925, South Africa
dc.contributor.otherCenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA ; kamlesh.rajpurohit@cfa.harvard.edu
dc.contributor.otherLeiden Observatory, Leiden University , PO Box 9513, NL-2300 RA Leiden, The Netherlands
dc.date.accessioned2025-10-09T04:55:31Z
dc.date.available2025-10-09T04:55:31Z
dc.date.issued01-01-2024
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ad8136
dc.identifier.urihttp://digilib.fisipol.ugm.ac.id/repo/handle/15717717/40844
dc.description.abstractWe present deep, wideband multifrequency radio observations (144 MHz−8 GHz) of the remarkable galaxy group NGC 741, which yield crucial insights into the interaction between the infalling head-tail radio galaxy (NGC 742) and the main group. Our new data provide an unprecedentedly detailed view of the NGC 741-742 system, including the shock cone, disrupted jets from NGC 742, the long (∼255 kpc) braided southern radio tail, and the eastern lobe-like structure (∼100 kpc), and reveal, for the first time, complex radio filaments throughout the tail and lobe, and a likely vortex ring behind the shock cone. The cone traces the bow shock caused by the supersonic ( ${ \mathcal M }\sim 2$ ) interaction between the head-tail radio galaxy NGC 742 and the intragroup medium (IGrM), while the ring may have been formed by the interaction between the NGC 742 shock and a previously existing lobe associated with NGC 741. This interaction plausibly compressed and reaccelerated the radio plasma. We estimate that shock-heating by NGC 742 has likely injected ∼2–5 × 10 ^57 erg of thermal energy into the central 10 kpc cooling region of the IGrM, potentially affecting the cooling and feedback cycle of NGC 741. A comparison with Chandra X-ray images shows that some of the previously detected thermal filaments align with radio edges, suggesting compression of the IGrM as the relativistic plasma of the NGC 742 tail interacts with the surrounding medium. Our results highlight that multifrequency observations are key to disentangling the complex, intertwined origins of the variety of radio features seen in the galaxy group NGC 741, and the need for simulations to reproduce all the detected features.
dc.language.isoEN
dc.publisherIOP Publishing
dc.subject.lccAstrophysics
dc.titleA Deep Dive into the NGC 741 Galaxy Group: Insights into a Spectacular Head-tail Radio Galaxy from VLA, MeerKAT, uGMRT, and LOFAR
dc.typeArticle
dc.description.keywordsGalaxy groups
dc.description.keywordsRadio continuum emission
dc.description.keywordsGalaxy interactions
dc.description.doi10.3847/1538-4357/ad8136
dc.title.journalThe Astrophysical Journal
dc.identifier.e-issn1538-4357
dc.identifier.oaioai:doaj.org/journal:124b11535dc34b1d831741e8bdb1f359
dc.journal.infoVolume 976, Issue 1


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