| Name | OT2_hkaneda_2 |
| Title | Spatially-resolved study of dust grains in X-ray elliptical galaxies to understand their origin and interplay with hot plasma |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342265561&instrument_name=SPIRE&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-fij1lo7 |
| Author | kaneda, h. |
| Description | We propose to study the properties of dust in elliptical galaxies. The interstellar environment of elliptical galaxies is characterized by the dominance of hot plasma and old stellar radiation fields with little UV. Dust in hot plasma is easily destroyed by sputtering, while old stars cannot replenish a large amount of dust into the interstellar space. Despite such hostile conditions, many elliptical galaxies contain a considerable amount of dust.Our goals are to identify the supplying sources of dust and to understand interplay between dust and hot plasma. We selected 6 galaxies from the AKARI sample, which were found to be extended in the far-IR with AKARI. But its spatial resolution was too poor to discuss the detailed structures of the dust emission. Herschel is the only facility which enables us to discuss them. Our studies are based on two kinds of Herschel data: PACS imaging with the finest resolution and PACS-SPIRE SED mapping with a coarser resolution. Using the former data, we spatially decompose the dust distribution into a stellar distribution, a dust lane, a central point-like source, and the other. We derive the fraction of each component to the total emission. The last component may represent clumpy clouds in outer regions or structures extending from the center, which are compared with X-ray data. As for the latter data, we combine them with the AKARI mid-IR images to obtain SED maps. Each SED will be compared with model SEDs to investigate the dust size distribution and temperature. From spatial variations of the size distribution, we determine the dynamics of dust, i.e., in-falling to or out-flowing from the center of a galaxy. Finally the results of both studies will be combined to draw a firm conclusion on the origin of dust in elliptical galaxies.The proposed observations have exposure deep enough to detect diffuse emission associated with each galaxy, which are complementary to those so far performed with rather shallow exposure for a larger sample of elliptical galaxies. |
| Publication |
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| Instrument | PACS_PacsPhoto_largeScan, SPIRE_SpirePhoto_small |
| Temporal Coverage | 2013-02-21T01:14:19Z/2013-04-26T15:23:09Z |
| Version | SPG v14.2.0 |
| Mission Description | Herschel was launched on 14 May 2009! It is the fourth cornerstone mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities. |
| Creator Contact | https://support.cosmos.esa.int/h®erschel/ |
| Date Published | 2013-10-26T15:17:01Z |
| Last Update | 2026-03-02 |
| Keywords | Herschel Space Observatory data, ESA Herschel mission dataset, far-infrared astronomy observations, submillimeter astronomy data, infrared space telescope observations, PACS photometer data, PACS spectrometer data, SPIRE photometer data, SPIRE Fourier transform spectrometer data, HIFI heterodyne spectroscopy data, far-infrared spectroscopy dataset, submillimeter spectral line observations, cold universe observations dataset, star formation infrared data, molecular cloud far-infrared observations, interstellar medium spectroscopy data, protoplanetary disk infrared observations, galaxy evolution far-infrared data, dust emission submillimeter observations, cosmic infrared background measurements, extragalactic infrared survey data, calibrated level 2 data products, FITS files astronomy, spectral cubes far-infrared, flux-calibrated maps, continuum photometry data, spectral energy distribution measurements, ESA Herschel Science Archive data |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, kaneda et al., 2013, 'Spatially-resolved study of dust grains in X-ray elliptical galaxies to understand their origin and interplay with hot plasma', SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-fij1lo7 |