2013A&A...549A.125R


Query : 2013A&A...549A.125R

2013A&A...549A.125R - Astronomy and Astrophysics, volume 549A, 125-125 (2013/1-1)

Analysis of Spitzer-IRS spectra of hyperluminous infrared galaxies.

RUIZ A., RISALITI G., NARDINI E., PANESSA F. and CARRERA F.J.

Abstract (from CDS):

Hyperluminous infrared galaxies (HLIRG) are the most luminous persistent objects in the Universe. They exhibit extremely high star formation rates, and most of them seem to harbour an active galactic nucleus (AGN). They are unique laboratories for investigating the most extreme star formation and its connection to super-massive black hole growth. The relative AGN and starburst (SB) contributions to the total output in these objects is still debated. Our aim is to disentangle the AGN and SB emission of a sample of thirteen HLIRG. We studied the MIR low-resolution spectra of a sample of thirteen HLIRG obtained with the Infrared Spectrograph on board Spitzer. The 5-8µm range is an optimal window for detecting AGN activity even in a heavily obscured environment. We performed an SB/AGN decomposition of the continuum using templates, which has been successfully applied for ULIRG in previous works. The MIR spectra of all sources is largely dominated by AGN emission. By converting the 6 µm luminosity into IR luminosity, we found that ∼80% of the sample shows an IR output dominated by the AGN emission. However, the SB activity is significant in all sources (mean SB contribution ∼30%), showing star formation rates ∼300-3000M☉/yr. With X-ray and MIR data we estimated the dust covering factor (CF) of these HLIRG, finding that a significant fraction presents a CF consistent with unity. Along with the high X-ray absorption shown by these sources, this suggests that large amounts of dust and gas enshroud the nucleus of these HLIRG, as also observed in ULIRG. Our results agree with previous studies of the IR SED of HLIRG using radiative transfer models, and we find strong evidence that all HLIRG harbour an AGN. Moreover, this work provides further support for the idea that AGN and SB are both crucial to understanding the properties of HLIRG. Our study of the CF supports the hypothesis that HLIRG can be divided into two different populations.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: starburst - X-rays: galaxies - infrared: galaxies - galaxies: evolution

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 - 2022
#notes
1 IRAS F00183-7111 Sy2 00 20 34.7 -70 55 27     20.6     ~ 129 0
2 IRAS F00235+1024 G 00 26 06.651 +10 41 26.57           ~ 24 0
3 M 77 GiP 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4380 2
4 LEDA 2816582 G 07 40 10.4 -23 49 58           ~ 14 0
5 2MASS J09134545+4056282 Sy2 09 13 45.4951283928 +40 56 28.215343572   19.69 19.21     ~ 244 2
6 [VV2003] J100552.9+493442 Sy1 10 05 52.6291163376 +49 34 48.042563232     19.61     ~ 22 0
7 NGC 4355 Sy2 12 26 54.6206739120 -00 52 39.421212996   14.21 13.37     ~ 458 2
8 LB 11408 QSO 12 53 17.5764589992 +31 05 50.628627492   17.20 17.00     ~ 62 0
9 LEDA 2816846 Sy2 12 54 00.8097492312 +10 11 12.237857124   19.03 18.27     ~ 47 0
10 IRAS 13279+3401 QSO 13 30 15.2350468416 +33 46 29.582104116     17.20     ~ 25 0
11 LEDA 84105 Sy1 14 04 38.7980689872 +43 27 07.452879120   16.12 15.76     ~ 123 0
12 2XMM J153244.0+324248 Sy2 15 32 44.0246599800 +32 42 46.679782356     19.8     ~ 106 0
13 FF J1614+3234 G 16 14 22.1329971936 +32 34 03.718993656           ~ 16 0
14 [VV96] J164010.4+410522 QSO 16 40 10.1317401000 +41 05 22.192517940 16.43 17.41 17.06   16.73 ~ 21 0
15 ClG 1821+64 ClG 18 21 56.7276 +64 20 55.841           ~ 497 1
16 7C 1821+6419 Sy1 18 21 57.2130271440 +64 20 36.221312076   14.23 14.24     ~ 572 1
17 IRAS F23569-0341 G 23 59 33.6 -03 25 13           ~ 6 0

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2022.10.02-02:09:08

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