skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: THE SPITZER-IRAC POINT-SOURCE CATALOG OF THE VELA-D CLOUD

Abstract

This paper presents the observations of Cloud D in the Vela Molecular Ridge, obtained with the Infrared Array Camera (IRAC) camera on board the Spitzer Space Telescope at the wavelengths {lambda} = 3.6, 4.5, 5.8, and 8.0 {mu}m. A photometric catalog of point sources, covering a field of approximately 1.2 deg{sup 2}, has been extracted and complemented with additional available observational data in the millimeter region. Previous observations of the same region, obtained with the Spitzer MIPS camera in the photometric bands at 24 {mu}m and 70 {mu}m, have also been reconsidered to allow an estimate of the spectral slope of the sources in a wider spectral range. A total of 170,299 point sources, detected at the 5{sigma} sensitivity level in at least one of the IRAC bands, have been reported in the catalog. There were 8796 sources for which good quality photometry was obtained in all four IRAC bands. For this sample, a preliminary characterization of the young stellar population based on the determination of spectral slope is discussed; combining this with diagnostics in the color-magnitude and color-color diagrams, the relative population of young stellar objects (YSOs) in different evolutionary classes has been estimated and a total of 637more » candidate YSOs have been selected. The main differences in their relative abundances have been highlighted and a brief account for their spatial distribution is given. The star formation rate has also been estimated and compared with the values derived for other star-forming regions. Finally, an analysis of the spatial distribution of the sources by means of the two-point correlation function shows that the younger population, constituted by the Class I and flat-spectrum sources, is significantly more clustered than the Class II and III sources.« less

Authors:
; ;  [1]
  1. Dipartimento di Fisica, Universita del Salento, CP 193, 73100 Lecce (Italy)
Publication Date:
OSTI Identifier:
21455046
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 719; Journal Issue: 1; Other Information: DOI: 10.1088/0004-637X/719/1/9; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; COLOR; CORRELATION FUNCTIONS; PHOTOMETRY; POINT SOURCES; STAR EVOLUTION; STARS; TELESCOPES; EVOLUTION; FUNCTIONS; OPTICAL PROPERTIES; ORGANOLEPTIC PROPERTIES; PHYSICAL PROPERTIES; RADIATION SOURCES

Citation Formats

Strafella, F, Elia, D, and Campeggio, L. THE SPITZER-IRAC POINT-SOURCE CATALOG OF THE VELA-D CLOUD. United States: N. p., 2010. Web. doi:10.1088/0004-637X/719/1/9.
Strafella, F, Elia, D, & Campeggio, L. THE SPITZER-IRAC POINT-SOURCE CATALOG OF THE VELA-D CLOUD. United States. https://doi.org/10.1088/0004-637X/719/1/9
Strafella, F, Elia, D, and Campeggio, L. 2010. "THE SPITZER-IRAC POINT-SOURCE CATALOG OF THE VELA-D CLOUD". United States. https://doi.org/10.1088/0004-637X/719/1/9.
@article{osti_21455046,
title = {THE SPITZER-IRAC POINT-SOURCE CATALOG OF THE VELA-D CLOUD},
author = {Strafella, F and Elia, D and Campeggio, L},
abstractNote = {This paper presents the observations of Cloud D in the Vela Molecular Ridge, obtained with the Infrared Array Camera (IRAC) camera on board the Spitzer Space Telescope at the wavelengths {lambda} = 3.6, 4.5, 5.8, and 8.0 {mu}m. A photometric catalog of point sources, covering a field of approximately 1.2 deg{sup 2}, has been extracted and complemented with additional available observational data in the millimeter region. Previous observations of the same region, obtained with the Spitzer MIPS camera in the photometric bands at 24 {mu}m and 70 {mu}m, have also been reconsidered to allow an estimate of the spectral slope of the sources in a wider spectral range. A total of 170,299 point sources, detected at the 5{sigma} sensitivity level in at least one of the IRAC bands, have been reported in the catalog. There were 8796 sources for which good quality photometry was obtained in all four IRAC bands. For this sample, a preliminary characterization of the young stellar population based on the determination of spectral slope is discussed; combining this with diagnostics in the color-magnitude and color-color diagrams, the relative population of young stellar objects (YSOs) in different evolutionary classes has been estimated and a total of 637 candidate YSOs have been selected. The main differences in their relative abundances have been highlighted and a brief account for their spatial distribution is given. The star formation rate has also been estimated and compared with the values derived for other star-forming regions. Finally, an analysis of the spatial distribution of the sources by means of the two-point correlation function shows that the younger population, constituted by the Class I and flat-spectrum sources, is significantly more clustered than the Class II and III sources.},
doi = {10.1088/0004-637X/719/1/9},
url = {https://www.osti.gov/biblio/21455046}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 719,
place = {United States},
year = {Tue Aug 10 00:00:00 EDT 2010},
month = {Tue Aug 10 00:00:00 EDT 2010}
}