Back to Search
Start Over
Herschel observations of Cen A: stellar heating of two extragalactic dust clouds
- Source :
- Monthly Notices of the Royal Astronomical Society, Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2012, 420 (3), pp.1882--1896. ⟨10.1111/j.1365-2966.2011.19819.x⟩, Monthly Notices of the Royal Astronomical Society, 2012, 420 (3), pp.1882--1896. ⟨10.1111/j.1365-2966.2011.19819.x⟩, Monthly Notices of the Royal Astronomical Society, 420(3), 1882-1896. Oxford University Press
- Publication Year :
- 2012
- Publisher :
- HAL CCSD, 2012.
-
Abstract
- We present the first results of a multi-wavelength survey, incoporating Herschel-SPIRE, Spitzer, GALEX and ATCA observations, of a 1 deg x 1 deg field centred on Centaurus A. As well as detecting the inner lobes of the active galactic nucleus (AGN) jet and counterjet, we have found two clouds, bright at sub-mm wavelengths, ~15 kpc from the centre of Cen A that are co-aligned with the jets. Flux measurements at Herschel wavelengths have proved vital in constraining fits to the Spectral Energy Distributions (SEDs). The clouds are well fit by a single-temperature, modified blackbody spectrum (beta=2) indicating that we are looking at two cold dust clouds on the outskirts of Cen A. The temperature and masses of the clouds are: T_{north} = 12.6^{+1.1}_{-1.2} K, T_{south} = 15.1^{+1.7}_{-1.6} K; log(M_{north} / M_o) = 5.8^{+0.2}_{-0.2}, log(M_{south} / M_o) = 5.6^{+0.2}_{-0.2} and the gas-dust ratio for both clouds is ~100. The measured values for the northern dust cloud are consistent with previous measurements from ISO while the southern cloud is a new sub-mm detection. The two dust clouds are located at the termini of the partial HI ring that surrounds Cen A which is also where the gas column density peaks... abridged<br />Comment: 16 pages, 9 figures, Accepted for publication in MNRAS, author email: robbie.auld@astro.cf.ac.uk
- Subjects :
- EMISSION-LINE FILAMENTS
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
CENTAURUS-A EVIDENCE
INTERSTELLAR-MEDIUM
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
extinction
Astrophysics::High Energy Astrophysical Phenomena
galaxies: active
ENERGY PARTICLE-ACCELERATION
FOS: Physical sciences
Astrophysics::Cosmology and Extragalactic Astrophysics
galaxies: jets
160 MU-M
submillimetre: ISM
INDUCED STAR-FORMATION
X-RAY-EMISSION
MULTIBAND IMAGING PHOTOMETER
NGC 5128
Astrophysics::Solar and Stellar Astrophysics
dust
FORMATION RATE INDICATORS
submillimetre: galaxies
galaxies: ISM
Astrophysics::Galaxy Astrophysics
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 00358711 and 13652966
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society, Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2012, 420 (3), pp.1882--1896. ⟨10.1111/j.1365-2966.2011.19819.x⟩, Monthly Notices of the Royal Astronomical Society, 2012, 420 (3), pp.1882--1896. ⟨10.1111/j.1365-2966.2011.19819.x⟩, Monthly Notices of the Royal Astronomical Society, 420(3), 1882-1896. Oxford University Press
- Accession number :
- edsair.doi.dedup.....fd2aaee1b08cc70d6e23572177e06a48