2004A&A...419L..49H


Query : 2004A&A...419L..49H

2004A&A...419L..49H - Astronomy and Astrophysics, volume 419, L49-53 (2004/6-1)

Mid-infrared selection of AGN.

HAAS M., SIEBENMORGEN R., LEIPSKI C., OTT S., CUNOW B., MEUSINGER H., MUELLER S.A.H., CHINI R. and SCHARTEL N.

Abstract (from CDS):

Since a large fraction of active galactic nuclei (AGN) is missed in common UV-excess surveys and is even hard to find in radio, near-IR and X-ray surveys, we have used a new AGN selection technique which is expected to be not affected by extinction. Within the scientific verification of the ISOCAM Parallel Survey at 6.7µm we have discovered objects with exceptional mid-infrared (MIR) emission. They are essentially not detected on IRAS-ADDSCANs and only very few of them show up in the NVSS and FIRST radio surveys. Various colour criteria of the 6.7µm data with 2MASS and optical wavebands show that the sources reach more extreme IR colours than the sources in the Hubble Deep Field-South and the ELAIS survey. The comparison with known object types suggests that we have found AGN with a pronounced MIR emission, probably due to circum-nuclear dust. First results from optical spectroscopy of ten candidates corroborate this interpretation showing four AGN, two reddened LINER and four extremely reddened emission-line galaxies with MIR/FIR flux ratios higher than for known pure starburst galaxies. The results will make a significant contribution to the debate on the entire AGN population.

Abstract Copyright:

Journal keyword(s): galaxies: fundamental parameters - galaxies: photometry - quasars: general - infrared: galaxies

Nomenclature: Fig.2: ISOCP NNNNN N=3. Text: [HSL2004] JHHMMSS.s+DDMMSS N=1

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 520 IG 01 24 35.071 +03 47 32.68 12.41 12.24 11.42     ~ 503 3
2 ISOCP 8080 IR 02 26 14.1 -24 37 15           ~ 1 0
3 ISOCP 2831 IR 03 08 05.3 -66 37 02           ~ 1 0
4 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1203 3
5 LEDA 17155 Sy2 05 21 01.3994605776 -25 21 45.321827832   15.47 14.75     ~ 471 0
6 NGC 2146 SBG 06 18 37.710 +78 21 25.27 11.67 11.38 10.59     ~ 676 2
7 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5657 6
8 NGC 3256 IG 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 808 2
9 2MASS J12281094+0852471 EmG 12 28 10.9535407824 +08 52 47.001036000           ~ 4 0
10 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1920 3
11 2MASS J13250782+0541052 Sy1 13 25 07.8203735232 +05 41 05.371875492   19.23 18.66     ~ 27 0
12 Mrk 273 Sy2 13 44 42.1883001096 +55 53 13.596220932   15.68 14.91     ~ 876 3
13 LEDA 52270 Sy1 14 37 38.2867288488 -15 00 24.087592692   16.58 16.40     ~ 261 1
14 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2859 4
15 3C 345 QSO 16 42 58.80997043 +39 48 36.9939552   16.81 16.59 16.84   ~ 1650 2
16 NAME HDF-S reg 22 32 56 -60 33.0           ~ 558 0
17 LEDA 90429 SyG 23 39 01.274 +36 21 08.77   16.17       ~ 205 1

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2022.12.01-12:28:39

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