J/A+A/639/A111ivo://CDS.VizieR/J/A+A/639/A111doi:10.26093/cds/vizier.36390111CDSStein Y.Dettmar R.-J.Beck R.Irwin J.Wiegert T.Miskolczi A.,Wang Q.D.English J.Henriksen R.Radica M.L J.-T.2020-10-12T10:31:17Z2020-07-21T10:51:41ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxiesradio-continuum-emissionmagnetic-fieldspolarimetryWe investigate the radio continuum halo, the magnetic field, and the transport processes of the CRs of the edge-on spiral galaxy NGC 4217 using Continuum HAlos in Nearby Galaxies - an Evla Survey (CHANG-ES) radio data at two frequencies, 6GHz (C-band) and 1.5GHz (L-band), and supplemental LOFAR data of this galaxy at 150MHz. With additional X-ray Chandra data, we study the connection of radio features to the diffuse hot gas around NGC 4217. NGC 4217 shows a large-scale X-shaped magnetic field structure, covering a major part of the galaxy with a mean total magnetic field strength in the disk of 9G. From the analysis of the rotation measure map at C-band, we found that the direction of the disk magnetic field is pointing inward. A helical outflow structure is furthermore present in the northwestern part of the galaxy, which is extended nearly 7 kpc into the halo. More polarized emission is observed on the approaching side of the galaxy, indicating that Faraday depolarization has to be considered at C-band. With a simplified galaxy disk model, we are able to explain the finding of higher polarized intensity on the approaching side. We generalize the model to predict that roughly 75% of edge-on spiral galaxies will show higher polarized intensity on the approaching side. Many loop and shell structures are found throughout the galaxy in total intensity at C-band. One structure, a symmetric off-center (to the southwest of the disk) superbubble-like structure is prominent in total and polarized intensity, as well as in Halpha and optical dust filaments. This is at a location where a second peak of total intensity (to the southwest of the disk) is observed, making this superbubble-like structure a possible result of a concentrated star formation region in the disk. The X-ray diffuse emission shows similarities to the polarized diffuse emission of NGC 4217. The flux density extension of the radio continuum halo increases toward lower frequencies. While the total flux density of the disk and halo are comparable at C-band, the contribution of the disk flux density decreases toward LOFAR to 18% of the total flux density. Dumbbell-shaped structures are present at C-band and at the LOFAR frequency. Total intensity profiles at the two CHANG-ES bands and the LOFAR frequency show a clear two-component behavior and were fit best with a two-component exponential fit. The halo scale heights are 1.10+/-0.04kpc, 1.43+/-0.09kpc, and 1.55+/-0.04kpc in C-band, L-band, and 150MHz, respectively. The frequency dependence of these scale heights between C-band and L-band suggests advection to be the main transport process. The 1D CRE transport modeling shows that advection appears to be more important than diffusion.2020A&A...639A.111Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/639/A111CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/150/81 : CHANG-ES. IV. VLA D-configuration observations (Wiegert+, 2015)J/A+A/623/A33 : NGC 4666 polarization maps (Stein+, 2019)J/A+A/632/A10 : NGC 4631 total intensity images (Mora-Partiarroyo+, 2019)J/A+A/632/A11 : Radio images of NGC 4631 (Mora-Partiarroyo+, 2019)J/A+A/632/A12 : NGC 891 and NGC 4565 radio images (Schmidt+, 2019)J/A+A/632/A13 : NGC 4013 radio and polarization maps (Stein+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/639/A111https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/639/A111http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/639/A111https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/639/A111https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/639/A111http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/639/A111GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/639/A111/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/639/A111/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/639/A111/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/639/A111/list?GETtext/xml+votable180.050000true183.9620847.091780.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/639/A1116/10979https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/639/A111?format=asciiRadiodefaultJ/A+A/639/A111/listList of fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation datestime.epoch;obsnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharAssocDataAssociated Data web pagemeta.ref.urlchar