J/A+A/664/A88ivo://CDS.VizieR/J/A+A/664/A88doi:10.26093/cds/vizier.36640088CDSEmig K.L.White G.J.Salas P.Karim R.L.van Weeren R.J.Teuben P.J.,Zavagno A.Chiu P.Haverkorn M.Oonk J.B.R.Orru E.Polderman I.M.,Reich W.Roettgering H.J.A.Tielens A.G.G.M.2022-08-29T10:08:00Z2022-08-12T13:11:33ZCDS support team

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

cds-question@unistra.frmilky-way-galaxystellar-associationsh-ii-regionsradio-sourcesIonized gas probes the influence of massive stars on their environment. The Cygnus X region (d~1.5kpc) is one of the most massive star forming complexes in our Galaxy, in which the Cyg OB2 association (age of 3-5Myr and stellar mass 2x10^4^M_{sun}_) has a dominant influence. We observe the Cygnus X region at 148 MHz using the Low Frequency Array (LOFAR) and take into account short-spacing information during image deconvolution. Together with data from the Canadian Galactic Plane Survey, we investigate the morphology, distribution, and physical conditions of low-density ionized gas in a 4'x4' (~100pcx100pc) region at a resolution of 2' (0.9pc). The Galactic radio emission in the region analyzed is almost entirely thermal (free-free) at 148 MHz, with emission measures (EM) of 10^3^<EM[pc/cm^6^]<10^6^. As filamentary structure is a prominent feature of the emission, we use DisPerSE and FilChaP to identify filamentary ridges and characterize their radial (EM) profiles. The distribution of radial profiles has a characteristic width of 4.3pc and a power-law distribution ({beta}=-1.8+/-0.1) in peak EM down to our completeness limit of 4200pc/cm^6^. The electron densities of the filamentary structure range between 10<=n_e_[cm^-3^]<=400 with a median value of 35cm^-3^, remarkably similar to [NII] surveys of ionized gas. Cyg OB2 may ionize at most two-thirds of the total ionized gas and the ionized gas in filaments. More than half of the filamentary structures are likely photoevaporating surfaces flowing into a surrounding diffuse (5cm^-3^) medium. However, this is likely not the case for all ionized gas ridges. A characteristic width in the distribution of ionized gas points to the stellar winds of Cyg OB2 creating a fraction of the ionized filaments through swept-up ionized gas or dissipated turbulence.2022A&A...664A..88Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/664/A88CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/241/551 : Radio continuum in Cygnus X region (Wendker+ 1991)J/A+A/375/539 : Compact HII regions in Cyg X JHK photometry (Comeron+, 2001)J/ApJ/643/238 : Chandra/2MASS sources in Cygnus OB2 (Butt+, 2006)J/A+A/474/495 : X-ray flares from Cygnus OB2 young starsJ/A+A/476/1243 : Millimeter continuum mapping of Cygnus X (Motte+, 2007)J/ApJS/184/84 : X-ray sources in Cyg OB2 region (Wright+, 2009)J/ApJ/713/871 : Sources in star-forming region Cyg-OB2 from X-rayJ/A+A/527/A135 : Gas dynamics in Massive Dense Cores in Cygnus-XJ/ApJ/727/114 : BLAST 2005: a 10deg^2^ survey in Cygnus X (Roy+, 2011)J/A+A/570/A1 : Cygnus-X CO and SiO outflows datacubesJ/AJ/148/11 : Infrared photometry in Cygnus-X (Kryukova+, 2014)J/MNRAS/458/3027 : Young and embedded clusters in Cygnus-X (Maia+, 2016)J/ApJS/234/8 : YSO jets from UWISH2. IV. Cygnus-X outflows (Makin+, 2018)J/ApJ/883/156 : Nobeyama 45m Cygnus-X CO. II. C180 clumps (Takekoshi+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/664/A88https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/664/A88http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/664/A88https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/664/A88https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/664/A88http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/664/A88GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/664/A88/list (Information of fits image)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/664/A88/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/664/A88/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/664/A88/list?GETtext/xml+votable180.050000true309.558088742.55674910.0055555555555555566/14704https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/664/A88?format=asciiRadiodefaultJ/A+A/664/A88/listInformation of fits imagerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation datestime.epoch;obsnullableFreq[148.046] Observed frequencyMHzem.freqfloatsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexed