Discovery of Active Galactic Nuclei in Mid- and Far-Infrared Deep Surveys with ISO

We present mid and far-infrared energy distributions of the CfA Seyfert sample, obtained with the Infrared Space Observatory photometer (ISO-PHOT). To analyse the CfA Seyfert SEDS, we apply an inversion method: the Inverse Planckian Transform, assuming that the mid- and far-IR emission is thermal. We obtain the spectral temperature distribution of sources that reproduces the observed SEDS. We compare the parameters of the spectral components found showing that there are not differences between Seyfert 1 and Seyfert 2 as for their temperatures while the emission between 12 and 25 μm is anisotropic.

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The Southern 2MASS Active Galactic Nuclei Survey: Spectroscopic Follow-up with Six Degree Field

Publications of the Astronomical Society of Australia ◽

10.1071/as10001 ◽

2010 ◽

Vol 27 (3) ◽

pp. 302-320 ◽

Cited By ~ 2

Author(s):

Frank J. Masci ◽

Roc M. Cutri ◽

Paul J. Francis ◽

Brant O. Nelson ◽

John P. Huchra ◽

...

Keyword(s):

Active Galactic Nuclei ◽

Galactic Nuclei ◽

Far Infrared ◽

Type I ◽

Galactic Latitude ◽

Stellar Objects ◽

Identification Rate ◽

Near Ir ◽

The Uk ◽

Probable Type

AbstractThe Two Micron All-Sky Survey (2MASS) has provided a uniform photometric catalog to search for previously unknown red active galactic nuclei (AGN) and Quasi-Stellar Objects (QSOs).We have extended the search to the southern equatorial sky by obtaining spectra for 1182 AGN candidates using the six degree field (6dF) multifibre spectrograph on the UK Schmidt Telescope. These were scheduled as auxiliary targets for the 6dF Galaxy Redshift Survey. The candidates were selected using a single color cut of J – Ks > 2 to Ks ≲ 15.5 and a galactic latitude of lbl > 30°. 432 spectra were of sufficient quality to enable a reliable classification. 116 sources (∼27%) were securely classified as type I AGN, 20 as probable type I AGN, and 57 as probable type II AGN. Most of them span the redshift range 0.05 < z < 0.5 and only 8 (∼6%) were previously identified as AGN or QSOs. Our selection leads to a significantly higher AGN identification rate amongst local galaxies (>20%) than in any previous (mostly blue-selected) galaxy survey. A small fraction of the type I AGN could have their optical colors reddened by optically thin dust with AV < 2 mag relative to optically selected QSOs. A handful show evidence of excess far-infrared (IR) emission. The equivalent width (EW) and color distributions of the type I and II AGN are consistent with AGN unified models. In particular, the EW of the [Oiii] emission line weakly correlates with optical–near-IR color in each class of AGN, suggesting anisotropic obscuration of the AGN continuum. Overall, the optical properties of the 2MASS red AGN are not dramatically different from those of optically-selected QSOs. Our near-IR selection appears to detect the most near-IR luminous QSOs in the local universe to z≃0.6 and provides incentive to extend the search to deeper near-IR surveys.

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VSOP, A Space VLBI Programme

International Astronomical Union Colloquium ◽

10.1017/s0252921100077101 ◽

1990 ◽

Vol 123 ◽

pp. 263-269

Author(s):

H. Hirabayashi

Keyword(s):

Active Galactic Nuclei ◽

Phase Transfer ◽

Galactic Nuclei ◽

Satellite Orbit ◽

Radio Sources ◽

Space Observatory ◽

Stellar Objects ◽

Radio Observatory ◽

Star Forming ◽

Star Forming Regions

AbstractVSOP, VLBI Space Observatory Programme, is an approved space VLBI programme of ISAS for the study of very compact radio sources with the synthesized aperture of 30,000 km diameter, by connecting an orbiting radio observatory with ground radiotelescopes. The VSOP satellite carrying 10 m antenna with 1.6, 5, and 22 GHz band receivers will be launched in early 1995 by M-V rocket of ISAS into an eccentric orbit with 20,000 km in apogee height. The tracking network will be formed for the satellite orbit determination, phase transfer and IF down-link. VSOP aims imaging capability with best resolution of 0.0001 arc second in 22 GHz band. Imaging of active galactic nuclei, star forming regions and stellar objects, and radioastrometry are main scientific targets.

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Space VLBI Project VSOP

Symposium - International Astronomical Union ◽

10.1017/s0074180900173206 ◽

1993 ◽

Vol 156 ◽

pp. 203-206

Author(s):

Makoto Inoue

Keyword(s):

Active Galactic Nuclei ◽

Galactic Nuclei ◽

Basic Design ◽

Space Observatory ◽

Collaborative Project ◽

Maser Sources

A space VLBI satellite is planed to be launched in 1995 by the Institute of Space and Astronautical Science (ISAS), Japan. Together with this satellite, a worldwide collaborative project named the VLBI Space Observatory Program (VSOP) is under developed. Although the project is oriented to imaging mission for compact cores of active galactic nuclei and maser sources, it will open new aspect on all of VLBI applications. The basic design and parameters of VSOP project are reviewed.

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ISOPHOT: far-infrared imaging, polarimetry, and spectrophotometry on Infrared Space Observatory

10.1117/12.157847 ◽

1993 ◽

Cited By ~ 2

Author(s):

Dietrich Lemke ◽

Francisco Garzon ◽

Hans-Peter Gemuend ◽

Ulrich Groezinger ◽

Ingolf Heinrichsen ◽

...

Keyword(s):

Infrared Imaging ◽

Far Infrared ◽

Space Observatory ◽

Infrared Space Observatory ◽

Imaging Polarimetry

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AKARI Infrared Views of AGNs

Proceedings of the International Astronomical Union ◽

10.1017/s1743921310005909 ◽

2009 ◽

Vol 5 (S267) ◽

pp. 129-129

Author(s):

Shinki Oyabu

Keyword(s):

Infrared Spectroscopy ◽

Active Galactic Nuclei ◽

Near Infrared Spectroscopy ◽

Near Infrared ◽

Galactic Nuclei ◽

Far Infrared ◽

Sky Survey

AbstractThe Japanese infrared satellite AKARI has unique capabilities for near-infrared spectroscopy and an all-sky survey in the mid- and far-infrared. We present the recent results on active galactic nuclei that use the unique capabilities of AKARI.

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