Extension of HOPS Out to 500 ParSecs (eHOPS) Overview
eHOPS Overview eHOPS SEDs eHOPS Auxiliary Photometry Table IRSA Catalog Search Tool: eHOPS


The Extension of HOPS Out to 500 ParSecs (eHOPS) project used archival data to survey all the major star forming molecular clouds within 500 pc of the Sun, except Orion (which was surveyed by HOPS). The first eHOPS data release covers the Aquila molecular clouds (d ~ 436 pc). For every source detected in the Herschel/PACS bands, the eHOPS-Aquila catalog contains 1-850 micron SEDs assembled from 2MASS, Spitzer, Herschel, WISE, and JCMT/SCUBA-2 data. A total of 172 protostars are found in Aquila, tightly concentrated in the molecular filaments that thread the clouds. Of these, 71 (42%) are Class 0 protostars, 54 (31%) Class I protostars, 43 (25%) are flat-spectrum protostars, and 4 (2%) are Class II sources. Ten of the Class 0 protostars are young PACS Bright Red Sources similar to those discovered in Orion. eHOPS compares the SEDs to a grid of radiative transfer models to constrain the luminosities, envelope densities, and envelope masses of the protostars.

If you use eHOPS data, please cite both the journal article Pokhrel et al. (2023) and the dataset Digital Object Identifier (DOI): 10.26131/IRSA553.

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Data Set Characteristics

Data ProductDescriptionData Access
SED Data Catalog 2MASS JHK_s
Spitzer/IRAC 3.6, 4.5, 5.8, 8 micron
Spitzer/MIPS 24 micron
Herschel/PACS 70, 100, 160 micron
WISE 3.4, 4.6, 12, 22 micron
JCMT/SCUBA2 850 micron
Spitzer/IRS 5.4-35 micron
SED Fits Catalog Best-fit parameters, including SED class, luminosity, temperature, disk radius, envelope mass, inclination angle, etc.
eHOPS ID Catalog ID, ra, dec for eHOPS targets

eHOPS Documentation

Data Delivery Document