2004A&A...427..795J


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET01:12:47

2004A&A...427..795J - Astronomy and Astrophysics, volume 427, 795-801 (2004/12-1)

A population of extreme mid-to-near-infrared sources: Obscured AGN and dusty starbursts.

JOHANSSON P.H., VAEISAENEN P. and VACCARI M.

Abstract (from CDS):

We present a sample of mid-infrared detected sources from the European Large Area ISO Survey (ELAIS) regions characterised by strong mid-IR radiation with faint near-IR and optical counterparts. These extreme mid-to-near-IR objects (EMNOs) are defined here by a flux ratio of fν(15µm)/fν(2.2µm)>25. This population is not obvious in deeper small area ISO surveys, though it produces more than 20% of the observed cosmic IR background radiation (CIRB) at 15µm above 1mJy. Near-future large area deep mid-IR surveys with the Spitzer Space Telescope, however, are bound to uncover large amounts of these objects, which we argue to most likely be obscured AGNs, based on SED shapes and X-ray data. Very strong dusty starbursts at z>1 may also have high mid-to-near-IR flux ratios, but using the MIR/NIR and FIR/MIR ratios these may be separated. Most of our EMNOs appear to be ULIRGs, half are also extremely red objects (ERO). A curious case of a low redshift, less luminous object with a very young stellar population is also found. We predict that the simple broad band selection method makes EMNOs a useful window into high-redshift obscured nuclear activity and its sought after relation to star-formation, in a similar way that EROs have been used to define samples of high-redshift early type galaxies.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: starburst - galaxies: active - infrared: galaxies - cosmology: observations

Nomenclature: Table 1: EMNO N (Nos 1-9).

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4180 2
2 SBSG 0335-052 bCG 03 37 44.04 -05 02 38.5     16.65     ~ 438 1
3 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2727 4
4 ELAISC15 J160913+542320 IR 16 09 13.25 +54 23 22.2           ~ 3 0
5 SWIRE J161024.24+542328.3 AGN 16 10 24.41 +54 23 28.4           ~ 4 0
6 EMNO 7 AGN 16 35 15.6548 +40 56 07.706 22.98       22.52 ~ 8 0
7 [VV96] J163531.2+410024 QSO 16 35 31.0615626814 +41 00 27.382489228 18.07 19.42 19.09   18.50 ~ 35 0
8 5MUSES 264 G 16 35 41.69 +40 59 00.4 20.34         ~ 6 0
9 ELAISC15 J163543+410750 IR 16 35 43.16 +41 07 51.2           ~ 4 0
10 ELAISC15 J163615+404759 IR 16 36 15.77 +40 47 59.1           ~ 5 0
11 [VV2006] J163655.8+405909 QSO 16 36 55.769 +40 59 09.86 22.63   23.07 23.00 23.02 ~ 20 0
12 ELAISC15 J163748+412100 IR 16 37 48.15 +41 21 01.3           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2021.03.08-01:12:47

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