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Referencia bibliográfica
Astronomy and Astrophysics, Volume 518, id.L134
Fecha de publicación:
7
2010
Revista
Número de citas
18
Número de citas referidas
17
Descripción
Aims: We aim to demonstrate that the Herschel-ATLAS (H-ATLAS) is
suitable for a blind and unbiased survey for debris disks by identifying
candidate debris disks associated with main sequence stars in the
initial science demonstration field of the survey. We show that H-ATLAS
reveals a population of far-infrared/sub-mm sources that are associated
with stars or star-like objects on the SDSS main-sequence locus. We
validate our approach by comparing the properties of the most likely
candidate disks to those of the known population. Methods: We use
a photometric selection technique to identify main sequence stars in the
SDSS DR7 catalogue and a Bayesian Likelihood Ratio method to identify
H-ATLAS catalogue sources associated with these main sequence stars.
Following this photometric selection we apply distance cuts to identify
the most likely candidate debris disks and rule out the presence of
contaminating galaxies using UKIDSS LAS K-band images. Results:
We identify 78 H-ATLAS sources associated with SDSS point sources on the
main-sequence locus, of which two are the most likely debris disk
candidates: H-ATLAS J090315.8 and H-ATLAS J090240.2. We show that they
are plausible candidates by comparing their properties to the known
population of debris disks. Our initial results indicate that bright
debris disks are rare, with only 2 candidates identified in a search
sample of 851 stars. We also show that H-ATLAS can derive useful upper
limits for debris disks associated with Hipparcos stars in the field and
outline the future prospects for our debris disk search programme.
Herschel is an ESA space observatory with science instruments provided
by European-led Principal Investigator consortia and with important
participation from NASA.
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Este grupo desarrolla varios proyectos extragalácticos en diferentes rangos del espectro electromagnético utilizando satélites y telescopios en tierra para estudiar la evolución cosmológica de las galaxias y el origen de la actividad nuclear en galaxias activas. En el aspecto instrumental, el grupo forma parte del consorcio internacional que ha
Ismael
Pérez Fournon