Multiwavelength campaign on Mrk 509 VI. HST/COS observations of the far-ultraviolet spectrum

dc.contributorVirginia Techen
dc.contributor.authorKriss, G. A.en
dc.contributor.authorArav, Nahumen
dc.contributor.authorKaastra, J. S.en
dc.contributor.authorEbrero, J.en
dc.contributor.authorPinto, C.en
dc.contributor.authorBorguet, B.en
dc.contributor.authorEdmonds, Douglasen
dc.contributor.authorCostantini, E.en
dc.contributor.authorSteenbrugge, K. C.en
dc.contributor.authorDetmers, R. G.en
dc.contributor.authorBehar, E.en
dc.contributor.authorBianchi, S.en
dc.contributor.authorBlustin, A. J.en
dc.contributor.authorBranduardi-Raymont, G.en
dc.contributor.authorCappi, M.en
dc.contributor.authorMehdipour, M.en
dc.contributor.authorPetrucci, P. O.en
dc.contributor.authorPonti, G.en
dc.description.abstractWe present medium-resolution (lambda/Delta lambda similar to 20 000) ultraviolet spectra covering the 1155-1760 angstrom spectral range of the Seyfert 1 galaxy Mrk 509 obtained using the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST). Our observations were obtained simultaneously with a Low Energy Transmission Grating Spectrometer observation using the Chandra X-ray Observatory, and they are part of a multiwavelength campaign in September through December 2009 which also included observations with XMM-Newton, Swift, and INTEGRAL. Our spectra are the highest signal-to-noise observations to date of the intrinsic absorption components seen in numerous prior ultraviolet observations. To take advantage of the high S/N, we describe special calibrations for wavelength, flat-field and line-spread function corrections that we applied to the COS data. We detect additional complexity in the absorption troughs compared to prior observations made with the Space Telescope Imaging Spectrograph (STIS) on HST. We attribute the UV absorption to a variety of sources in Mrk 509, including an outflow from the active nucleus, the interstellar medium and halo of the host galaxy, and possible infalling clouds or stripped gaseous material from a merger that are illuminated by the ionizing radiation of the active nucleus. Variability between the STIS and COS observation of the most blue-shifted component (#1) allows us to set an upper limit on its distance of <250 pc. Similarly, variability of component 6 between FUSE observations limits its distance to <1.5 kpc. The absorption lines in all components only partially cover the emission from the active nucleus with covering fractions that are lower than those seen in the prior STIS observations and are comparable to those seen in spectra from the Far Ultraviolet Spectroscopic Explorer (FUSE). Given the larger apertures of COS and FUSE compared to STIS, we favor scattered light from an extended region near the active nucleus as the explanation for the partial covering. As observed in prior X-ray and UV spectra, the UV absorption has velocities comparable to the X-ray absorption, but the bulk of the ultraviolet absorption is in a lower ionization state with lower total column density than the gas responsible for the X-ray absorption. We conclude that the outflow from the active nucleus is a multiphase wind.en
dc.description.sponsorshipNASA from the Space Telescope Science Institute 12022en
dc.description.sponsorshipNASA NAS5-26555en
dc.description.sponsorshipGoddard Space Flight Center NNX09AR01Gen
dc.description.sponsorshipNWO, the Netherlands Organization for Scientific Researchen
dc.description.sponsorshipComite Mixto ESO - Gobierno de Chileen
dc.description.sponsorshipASI-INAF I/088/06/0en
dc.description.sponsorshipIsrael Science Foundationen
dc.description.sponsorshipGDR PCHE in Franceen
dc.description.sponsorshipCNES French national space agencyen
dc.description.sponsorshipEU FP7-PEOPLE-2009-IEF-254279en
dc.identifier.citationKriss, G. A. ; Arav, N. ; Kaastra, J. S. ; et al., Oct. 2011. “Multiwavelength campaign on Mrk 509 VI. HST/COS observations of the far-ultraviolet spectrum,” ASTRONOMY & ASTROPHYSICS 534:A41. DOI: 10.1051/0004-6361/201117123en
dc.publisherEDP Sciencesen
dc.rightsIn Copyrighten
dc.subjectgalaxies: activeen
dc.subjectgalaxies: individual: Mrk 509en
dc.subjectquasars: absorption linesen
dc.subjectgalaxies: Seyferten
dc.subjectultraviolet: galaxiesen
dc.subjectX-rays: galaxiesen
dc.subjectactive galactic nucleien
dc.subjectnarrow-line regionen
dc.subjectgalaxy markarian 509en
dc.subjectray/ultraviolet observing campaignen
dc.subjectray-heated windsen
dc.subjectintrinsic absorptionen
dc.subjectAstronomy & Astrophysicsen
dc.titleMultiwavelength campaign on Mrk 509 VI. HST/COS observations of the far-ultraviolet spectrumen
dc.title.serialAstronomy & Astrophysicsen
dc.typeArticle - Refereeden


Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
5.04 MB
Adobe Portable Document Format
Main article