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A deep optical/near-infrared catalogue of Serpens

Spezzi, L. and Merín, B. and Oliveira, I. and van Dishoeck, E. F. and Brown, J. M. (2010) A deep optical/near-infrared catalogue of Serpens. Astronomy and Astrophysics, 513 . Art. No. A38. ISSN 0004-6361.

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We present a deep optical/near-infrared imaging survey of the Serpens molecular cloud. This survey constitutes the complementary optical data to the Spitzer “Core To Disk” (c2d) Legacy survey in this cloud. The survey was conducted using the wide field camera at the Isaac Newton Telescope. About 0.96 square degrees were imaged in the R and Z filters, covering the entire region where most of the young stellar objects identified by the c2d survey are located. The 26 524 point-like sources were detected in both R and Z bands down to R ≈ 24.5 mag and Z ≈ 23 mag with a signal-to-noise ratio better than 3. The 95% completeness limit of our catalogue corresponds to 0.04 M_⊙ for members of the Serpens star-forming region (age 2 Myr and distance 260 pc) in the absence of extinction. Adopting the typical extinction of the observed area (A_V ≈ 7 mag), we estimate a 95% completeness level down to M ≈ 0.1 M_⊙. The astrometric accuracy of our catalogue is 0.4 arcsec with respect to the 2MASS catalogue. Our final catalogue contains J2000 celestial coordinates, magnitudes in the R and Z bands calibrated to the SDSS photometric system and, where possible, JHK_S magnitudes from 2MASS for sources in 0.96 square degrees in the direction of Serpens. This data product has already been used within the frame of the c2d Spitzer Legacy Project analysis in Serpens to study the star/disk formation and evolution in this cloud. Here we use it to obtain new indications of the disk-less population in Serpens.

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van Dishoeck, E. F.0000-0001-7591-1907
Additional Information:© 2010 ESO. Received 23 December 2009. Accepted 8 February 2010. Published online 21 April 2010. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by NASA and the National Science Foundation. We also acknowledge extensive use of the SIMBAD database, operated at CDS Strasbourg. We thank Ignas Snellen and the students from Leiden Observatory for taking these INT data in service time. We thank Mario Radvich for the concession of ASTROMETRIX. We are also grateful to F. Comerón, J.M. Alcalá, H. Bouy, B. Lopéz Martí, R. Jayawardhana and the Spitzer c2d Team for useful discussions and suggestions. We are also grateful to many others, in particular to Salvatore Spezzi.
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Subject Keywords:catalogs; stars: formation; stars: low-mass; stars: brown dwarfs; ISM: clouds; ISM: individual objects: Serpens
Record Number:CaltechAUTHORS:20110310-100116058
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Official Citation:A deep optical/near-infrared catalogue of Serpens A38 L. Spezzi, B. Merín, I. Oliveira, E. F. van Dishoeck and J. M. Brown Published online: 21 April 2010 DOI: 10.1051/0004-6361/200913956
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22807
Deposited By: Ruth Sustaita
Deposited On:11 Mar 2011 17:26
Last Modified:03 Oct 2019 02:40

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