[en] We present J- and K-band near-infrared (near-IR) photometry of a sample of mid-infrared (mid-IR) sources detected by the Infrared Space Observatory (ISO) as part of the European Large Area ISO Survey (ELAIS) and study their classification and star-forming properties. We have used the Preliminary ELAIS Catalogue for the 6.7-μm (LW2) and 15-μm (LW3) fluxes. All of the high-reliability LW2 sources and 80 per cent of the LW3 sources are identified in the near-IR survey reaching K~ 17.5 mag. The near-IR/mid-IR flux ratios can effectively be used to separate stars from galaxies in mid-IR surveys. The stars detected in our survey region are used to derive a new accurate calibration for the ELAIS ISOCAM data in both the LW2 and LW3 filters. We show that near- to mid-IR colour-colour diagrams can be used to classify galaxies further, as well as to study star formation. The ELAIS ISOCAM survey is found mostly to detect strongly star-forming late-type galaxies, possibly starburst-powered galaxies, and it also picks out obscured active galactic nuclei. The ELAIS galaxies yield an average mid-IR flux ratio LW2/LW3 = 0.67 +/- 0.27. We discuss the f[SUB]ν[/SUB](6.7 μ m)/f[SUB]ν[/SUB](15 μ m) ratio as a star formation tracer using ISO and IRAS data of a local comparison sample. We find that the f[SUB]ν[/SUB](2.2 μ m)/f[SUB]ν[/SUB](15 μ m) ratio is also a good indicator of activity level in galaxies and conclude that the drop in the f[SUB]ν[/SUB](6.7 μ m)/f[SUB]ν[/SUB](15 μ m) ratio seen in strongly star-forming galaxies is a result of both an increase of 15-μm emission and an apparent depletion of 6.7-μm emission. Near-IR together with the mid-IR data make it possible to estimate the relative amount of interstellar matter in the galaxies.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Vaisanen, Petri; Observatory, PO Box 14, University of Helsinki, Finland
Morel, Thierry ; Inter University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411007, India
Rowan-Robinson, M.; Astrophysics Group, Blackett Laboratory, Imperial College of Science, Technology & Medicine, Prince Consort Road, London SW7 2BZ
Serjeant, S.; Astrophysics Group, Blackett Laboratory, Imperial College of Science, Technology & Medicine, Prince Consort Road, London SW7 2BZ
Oliver, S.; Astrophysics Group, Blackett Laboratory, Imperial College of Science, Technology & Medicine, Prince Consort Road, London SW7 2BZ
Sumner, T.; Astrophysics Group, Blackett Laboratory, Imperial College of Science, Technology & Medicine, Prince Consort Road, London SW7 2BZ
Crockett, H.; Astrophysics Group, Blackett Laboratory, Imperial College of Science, Technology & Medicine, Prince Consort Road, London SW7 2BZ
scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.
Bibliography
Aussel, A., Cesarsky, C.J., Elbaz, D., Starck, J.L., (1999) A&A, 342, p. 313
Barkhouse, W.A., Hall, P.B., (2001) AJ, 121, p. 2843
Bertin, E., Arnouts, S., (1996) A&AS, 117, p. 393
Blommaert, J.A.D.L., Siebenmorgen, R., Coulais, A., Okumura, K., Ott, S., Sauvage, M., Starck, J.-L., (2001) The ISO Handbook Volume III: CAM -The ISO Camera, 3. , http://www.iso.vilspa.esa.es/
Boselli, A., (1998) A&A, 335, p. 53
Cesarsky, C.J., Sauvage, M., (1999) Ap&SS, 269, p. 303
Cesarsky, D., Lequeux, J., Abergel, A., Perault, M., Palazzi, E., Madden, S., Tran, D., (1996) A&A, 315, pp. L309
Ciliegi, P., (1999) MNRAS, 302, p. 222
Cimatti, A., (1999) A&A, 352, pp. L45
Crampton, D., Janson, T., Durrell, P., Cowley, A.P., Schmidtke, P.C., (1988) AJ, 96, p. 816
Cutri, R.M., (2000) Explanatory Supplement to the 2MASS Second Incremental Data Release, , http://www.ipac.caltech.edu/2mass/releases/second/doc/explsup.html
Dale, D.A., Helou, G., Silbermann, N.A., Contursi, A., Malhotra, S., Rubin, R.H., (1999) AJ, 118, p. 2055
Dale, D.A., (2000) AJ, 120, p. 583
Efstathiou, A., (2000) MNRAS, 319, p. 1169
Elbaz, D., (1999) A&A, 351, pp. L37
Elbaz, D., (1999) ESA SP-47,the Universe as Seen by ISO, p. 999. , Cox P., Kessler M. F., eds, ESA Publ. Div., ESTEC, Noordwijk
Genzel, R., Cesarsky, C.J., (2000) ARA&A, 38, p. 761
Haas, M., Müller, S.A.H., Chini, R., Meisenheimer, K., Klaas, U., Lemke, D., Kreysa, E., Camenzind, M., (2000) A&A, 354, p. 453
Helou, G., (1986) ApJ, 311, pp. L33
Helou, G., (1999) ESA SP-47, the Universe as Seen by ISO, p. 797. , Cox P., Kessler M. F., eds, ESA Publ. Div., ESTEC, Noordwijk
Helou, G., (2000) Les Houches Session LXX, Infrared Space Astronomy, Today and Tomorrow, p. 337. , Casoli F., Lequeux J., David F., eds, EDP Sciences, Springer, Berlin
Madden, S.C., Vigroux, L., Sauvage, M., (1999) ESA SP-47, the Universe as Seen by ISO, p. 933. , Cox P., Kessler M. F, eds, ESA Publ. Div., ESTEC, Noordwijk
Mattila, K., Lehtinen, K., Lemke, D., (1999) A&A, 342, p. 643
Missoulis, V., Crockett, H., Oliver, S., Dapergolas, A., Serjeant, S., Rowan-Robinson, M., Kontizas, E., Kontizas, M., (1999) ESA SP-47, the Universe as Seen by ISO, p. 85. , Cox P., Kessler M. F., eds, ESA Publ. Div., ESTEC, Noordwijk
Morel, T., (2001) MNRAS, 327, p. 1187
Oliver, S., (1997) MNRAS, 289, p. 471
Oliver, S., (2000) MNRAS, 316, p. 749
Pennington, R.L., Humphreys, R.M., Odewahn, S.C., Zumach, W., Thurmes, P.M., (1993) PASP, 105, p. 521
Pozzetti, L., Mannucci, F., (2000) MNRAS, 317, pp. L17
This website uses cookies to improve user experience. Read more
Save & Close
Accept all
Decline all
Show detailsHide details
Cookie declaration
About cookies
Strictly necessary
Performance
Strictly necessary cookies allow core website functionality such as user login and account management. The website cannot be used properly without strictly necessary cookies.
This cookie is used by Cookie-Script.com service to remember visitor cookie consent preferences. It is necessary for Cookie-Script.com cookie banner to work properly.
Performance cookies are used to see how visitors use the website, eg. analytics cookies. Those cookies cannot be used to directly identify a certain visitor.
Used to store the attribution information, the referrer initially used to visit the website
Cookies are small text files that are placed on your computer by websites that you visit. Websites use cookies to help users navigate efficiently and perform certain functions. Cookies that are required for the website to operate properly are allowed to be set without your permission. All other cookies need to be approved before they can be set in the browser.
You can change your consent to cookie usage at any time on our Privacy Policy page.