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Multiwavelength campaign on Mrk 509. VI. HST/COS observations of the far-ultraviolet spectrum
- Publication Year :
- 2011
- Publisher :
- arXiv, 2011.
-
Abstract
- We present medium resolution (R~20,000) HST/COS ultraviolet spectra covering 1155-1760 A of the Seyfert 1 Mrk 509 obtained simultaneously with a Chandra/LETGS spectrum as part of a multiwavelength campaign in 2009 that included observations with XMM-Newton, SWIFT, and Integral. Our high S/N spectrum detects additional complexity in the absorption troughs from a variety of sources in Mrk 509, including the outflow from the active nucleus, the ISM and halo of the host galaxy, and infalling clouds or stripped gas from a merger that are illuminated by the AGN. Variability between the STIS and COS observation of the -400 km/s component allows us to set an upper limit on its distance of < 250 pc. Similarly, variability of a component at +150 km/s between two prior FUSE observations limits its distance to < 1.5 kpc. The UV absorption only partially covers the emission from the AGN nucleus. Covering fractions are lower than those previously seen with STIS, and are comparable to those seen with FUSE. Given the larger apertures of COS and FUSE compared to STIS, we favor scattered light from an extended region near the AGN 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.<br />21 pages, 9 figures. Accepted for publication in Astronomy & Astrophysics, 26 May 2011
- Subjects :
- Cosmology and Nongalactic Astrophysics (astro-ph.CO)
010504 meteorology & atmospheric sciences
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
medicine.disease_cause
01 natural sciences
Spectral line
Ionization
0103 physical sciences
medicine
Absorption (electromagnetic radiation)
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
0105 earth and related environmental sciences
Physics
Astronomy and Astrophysics
Galaxy
medicine.anatomical_structure
13. Climate action
Space and Planetary Science
Outflow
Halo
Nucleus
Ultraviolet
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....a23958cd32e3bfd0eddf8abd3a7291fd
- Full Text :
- https://doi.org/10.48550/arxiv.1107.0661