An All-Sky Sample of Intermediate-Mass Star-Forming Regions

Abstract

We present an all-sky sample of 984 candidate intermediate-mass Galactic star-forming regions color-selected from the Infrared Astronomical Satellite (IRAS) Point Source Catalog and morphologically classify each object using mid-infrared Wide-field Infrared Survey Explorer (WISE) images. Of the 984 candidates, 616 are probable star-forming regions (62.6%), 128 are filamentary structures (13.0%), 39 are point-like objects of unknown nature (4.0%), and 201 are galaxies (20.4%). We conduct a study of four of these regions, IRAS 00259+5625, IRAS 00420+5530, IRAS 01080+5717, and IRAS 05380+2020, at Galactic latitudes |b| > 5 degrees using optical spectroscopy from the Wyoming Infrared Observatory along with near-infrared photometry from the Two-Micron All Sky Survey to investigate their stellar content. New optical spectra, color-magnitude diagrams, and color-color diagrams reveal their extinctions, spectrophotometric distances, and the presence of small stellar clusters containing 20-78 solar masses of stars. These low-mass diffuse star clusters contain 65-250 stars for a typical initial mass function, including one or more mid-B stars as their most massive constituents. Using infrared spectral energy distributions we identify young stellar objects near each region and assign probable masses and evolutionary stages to the protostars. The total infrared luminosity lies in the range 190 to 960 solar luminosities, consistent with the sum of the luminosities of the individually identified young stellar objects.

Accepted to ApJ

References in corpus (31)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• On the variation of the Initial Mass Function
• Theory of Star Formation
• The Initial Mass Function of Stars: Evidence for Uniformity in Variable Systems
• Evolution of asymptotic giant branch stars II. Optical to far-infrared isochrones with improved TP-AGB models
• GLIMPSE: I. A SIRTF Legacy Project to Map the Inner Galaxy
• Toward Understanding Massive Star Formation
• The Formation of Massive Stars from Turbulent Cores
• Interpreting Spectral Energy Distributions from Young Stellar Objects. II. Fitting observed SEDs using a large grid of pre-computed models
• Interpreting Spectral Energy Distributions from Young Stellar Objects. I. A grid of 200,000 YSO model SEDs
• The Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey
• Competitive accretion in embedded stellar cluster
• The Formation of Massive Star Systems by Accretion
• Star formation through gravitational collapse and competitive accretion
• The ACS Nearby Galaxy Survey Treasury IX. Constraining asymptotic giant branch evolution with old metal-poor galaxies
• The maximum stellar mass, star-cluster formation and composite stellar populations
• A Minimum Column Density of 1 g cm^-2 for Massive Star Formation
• CO emission from discs around isolated HAeBe and Vega-excess stars
• Trigonometric Parallaxes of 6.7 GHz Methanol Masers
• An Updated Look at Binary Characteristics of Massive Stars in the Cygnus OB2 Association
• The mmax-Mecl relation, the IMF and IGIMF: probabilistically sampled functions?
• The Youngest Stellar clusters Clusters associated with massive protostellar candidates
• Distance to NGC 281 in a Galactic Fragmenting Superbubble: Parallax Measurements with VERA
• Characterization and Photometric Membership of the Open Cluster NGC1981
• MASSCLEAN - MASSive CLuster Evolution and ANalysis Package - Description and Tests
• A Precise Distance to IRAS 00420+5530 via H2O Maser Parallax with the VLBA
• The influence of stellar-dynamical ejections and collisions on the relation between the maximum-star and star-cluster-mass
• The Interstellar Bubbles of G38.9-0.4 and the Impact of Stellar Feedback on Star Formation
• A Sample of Intermediate-Mass Star-Forming Regions: Making Stars at Mass Column Densities <1 g/cm^2
• IRAS03063+5735: A Bowshock Nebula Powered by an Early B Star
• Ultra-compact Embedded Clusters in the Galactic Plane

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• Clustered star formation at early evolutionary stages. Physical and chemical analysis of the young star-forming regions ISOSS J22478+6357 and ISOSS J23053+5953
• The intermediate-mass star-forming region Lynds 1340. An optical view
• The young stellar population of Lynds 1340. An infrared view
• A census of young stellar objects in two line-of-sight star forming regions toward IRAS 22147+5948 in the outer Galaxy
• The SOFIA Massive (SOMA) Star Formation Q-band follow-up I. Carbon-chain chemistry of intermediate-mass protostars
• Probing the star formation origin of gamma rays from 3FHL J1907.0+0713
• Structure of IRAS 05168+3634 star-forming region
• Census of young stellar population in the Galactic H II region Sh2-242
• Kronberger 55: A Candidate for End-dominated Collapse Scenario
• Kinematics and Feedback in H II regions in the Dwarf Starburst Galaxy IC 10
• A VLA Census of the Galactic H II Region Population