A dataset provided by the European Space Agency

Name BJIANG_1
Title THE NATURE OF IRAS LRS SOURCES WITHOUT NEAR-INFRARED DETECTION
URL

http://nida.esac.esa.int/nida-sl-tap/data?RETRIEVAL_TYPE=OBSERVATION&PRODUCT_LEVEL=ALL&obsno=623019080
DOI https://doi.org/10.5270/esa-tiz1bdd
Author JIANG, B W
Description some iras lrs sources can not be identified in the optical poss charts and even were not detected in near-infrared. they are peculiar objects in that the very sharp change of energy distribution happens between 12 micron and near-infrared. both the brightness at far infrared and invisibilty at optical band indicate a cold and thick circumstellar envelopes. so such objects without near-infrared detection proposes one question that why the thick circumstellar envelopes do not emit much in the near-infrared, i.e. k band magnitude fainter than 10 or flux density weaker than 0.067 jy at 2.2 micron. the mystery can be caused by two factors. one is that the circumstellar envelopes contain some special dust components which absorb much between 12 micron and 2 micron or emit much in the far-infrared. the other is that the sources are not point-like but extended. the non-detection at k band is caused by the smaller diaphragm compared with iras diaphragm. since optical and near-infrared observation can not provide any information about them at present on the ground, iso will be the only way to study them in mid- and far-infrared from space. furthermore, they are iras bright which make them very appropriate for iso detection. these very few sources stand for a peculiar group and may be in a special evolutionary stage between agb star and planetary nebula.
Instrument CAM01 , SWS01
Temporal Coverage 1996-12-19T20:28:16Z/1997-07-31T14:13:51Z
Version 1.0
Mission Description The Infrared Space Observatory (ISO) was the worlds first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
Creator Contact https://support.cosmos.esa.int/iso/
Date Published 1998-10-12T00:00:00Z
Last Update 2026-07-09
Keywords Infrared Space Observatory data, ESA ISO mission dataset, ISO infrared observations, mid-infrared astronomy data, far-infrared spectroscopy dataset, ISOCAM imaging data, ISOPHOT photometry data, SWS short wavelength spectrometer data, LWS long wavelength spectrometer data, infrared spectral line observations, infrared imaging survey data, dust emission infrared observations, star formation infrared dataset, interstellar medium spectroscopy data, polycyclic aromatic hydrocarbons PAH features data, active galactic nuclei infrared observations, circumstellar envelope infrared data, planetary nebula infrared spectroscopy, extragalactic infrared survey data, calibrated ISO data products, FITS files infrared astronomy, spectral energy distribution infrared data, continuum photometry dataset, infrared spectral cubes, flux-calibrated infrared maps, ESA ISO Data Archive, legacy infrared space mission dataset
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, JIANG et al., 1998, 'THE NATURE OF IRAS LRS SOURCES WITHOUT NEAR-INFRARED DETECTION', 1.0, European Space Agency, https://doi.org/10.5270/esa-tiz1bdd
Rights Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license.