Near- and mid-infrared colours of star-forming galaxies in European Large Area ISO Survey fields

Vaïsänen, P.; Morel, Thierry; Rowan‐Robinson, M.; Serjeant, S.; Oliver, Seb; Sumner, T. J.; Crockett, H.; Gruppioni, C.; Tollestrup, E. V.

doi:10.1046/j.1365-8711.2002.06006.x

Cited by 21 publications

(30 citation statements)

References 42 publications

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“…Figure 1 (top) shows their distribution in the H − K s versus K s − LW2 colour-colour diagram. Noteworthy, the ISOCP sources clearly reach more extreme IR colours than those of the Hubble Deep Field South Mann et al 2002) and the ELAIS fields (Väisänen et al 2002;Rowan-Robinson et al 2003). The corresponding limits are indicated in Fig.…”

Section: Agn Candidate Selectionmentioning

confidence: 99%

Mid-infrared selection of AGN

Haas

Siebenmorgen

Leipski

et al. 2004

A&A

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Abstract.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 6.7 µm 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 6.7 µm 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.

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Section: Agn Candidate Selectionmentioning

confidence: 99%

Mid-infrared selection of AGN

Haas

Siebenmorgen

Leipski

et al. 2004

A&A

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“…From the discussion above, it is clear that differentiation between YSOs and galaxies using only the m 6.7 − m 14.3 colour is impossible. According to the ELAIS (European Large Area ISO Survey) ISOCAM is very sensitive to strongly star-forming galaxies at 14.3 µm (Väisänen et al 2002) and based on ELAIS counts about 6 galaxies are expected in a region of this size at the achieved sensitivity.…”

Section: Discussionmentioning

confidence: 99%

ISOCAM observations of the L1551 star formation region

Gålfalk¹,

Olofsson²,

Kaas

et al. 2004

A&A

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Abstract. The results of a deep mid-IR ISOCAM survey of the L1551 dark molecular cloud are presented. The aim of this survey is a search for new YSO (Young Stellar Object) candidates, using two broad-band filters centred at 6.7 and 14.3 µm. Although two regions close to the centre of L1551 had to be avoided due to saturation problems, 96 sources were detected in total (76 sources at 6.7 µm and 44 sources at 14.3 µm). Using the 24 sources detected in both filters, 14 were found to have intrinsic mid-IR excess at 14.3 µm and were therefore classified as YSO candidates. Using additional observations in B, V, I, J, H and K obtained from the ground, most candidates detected at these wavelengths were confirmed to have mid-IR excess at 6.7 µm as well, and three additional YSO candidates were found. Prior to this survey only three YSOs were known in the observed region (avoiding L1551 IRS 5/NE and HL/XZ Tau). This survey reveals 15 new YSO candidates, although several of these are uncertain due to their extended nature either in the mid-IR or in the optical/near-IR observations. Two of the sources with mid-IR excess are previously known YSOs, one is a brown dwarf (MHO 5) and the other is the well known T Tauri star HH 30, consisting of an outflow and an optically thick disk seen edge on.

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“…There is only one BMW-C source which is found in the FIRST, IRAS, 2MASS and GSC2 catalogues (1BMC163608.2+410509); it is a galaxy observed by Infrared Space Observatory (ISO), in the European Large Area ISO Survey (ELAIS, Väisänen et al 2002) and in the radio (Ciliegi et al 1999). Furthermore, 71 BMW-C sources have IRAS, 2MASS and GSC2 matches; 4208 are found in both 2MASS and GSC2 catalogues.…”

Section: Cross-match With Existing Databasesmentioning

confidence: 99%

The Brera multi-scale wavelet Chandra survey

Romano

Campana²,

Mignani

et al. 2008

A&A

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We present the BMW-Chandra source catalogue drawn from essentially all Chandra ACIS-I pointed observations with an exposure time in excess of 10 ks public as of March 2003 (136 observations). Using the wavelet detection algorithm developed by Lazzati et al. (1999) and Campana et al. (1999), which can characterise both point-like and extended sources, we identified 21 325 sources. Among them, 16 758 are serendipitous, i.e. not associated with the targets of the pointings, and do not require a non-automated analysis. This makes our catalogue the largest compilation of Chandra sources to date. The 0.5-10 keV absorption corrected fluxes of these sources range from ∼3 × 10 −16 to 9 × 10 −12 erg cm −2 s −1 with a median of 7 × 10 −15 erg cm −2 s −1 . The catalogue consists of count rates and relative errors in three energy bands (total, 0.5-7 keV; soft, 0.5-2 keV; and hard, 2-7 keV), and source positions relative to the highest signal-to-noise detection among the three bands. The wavelet algorithm also provides an estimate of the extension of the source. We include information drawn from the headers of the original files, as well, and extracted source counts in four additional energy bands, SB1 (0.5-1 keV), SB2 (1-2 keV), HB1 (2-4 keV), and HB2 (4-7 keV). We computed the sky coverage for the full catalogue and for a subset at high Galactic latitude (| b | > 20• ). The complete catalogue provides a sky coverage in the soft band (0.5-2 keV, S /N = 3) of ∼8 deg 2 at a limiting flux of ∼10 −13 erg cm −2 s −1 , and ∼2 deg 2 at a limiting flux of ∼10 −15 erg cm −2 s −1 . Furthermore, we present the results of the cross-match with existing catalogues at different wavelengths (FIRST, IRAS, 2MASS, GSC2, and ChaMP). The total numbers of matches with the FIRST, IRASPSC, 2MASS, and GSC2 catalogues obtained after a closest-distance selection are 13, 87, 6700, and 4485, respectively.

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Near- and mid-infrared colours of star-forming galaxies in European Large Area ISO Survey fields

Cited by 21 publications

References 42 publications

Mid-infrared selection of AGN

Mid-infrared selection of AGN

ISOCAM observations of the L1551 star formation region

The Brera multi-scale wavelet Chandra survey

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