Mission Overview

Measuring Young Stars in Space and Time (MYSST)

 

Primary Investigator:  Dimitrios Gouliermis

HLSP Authors: Victor Ksoll, Elena Sabbi, Dimitrios Gouliermis, Ralf Klessen, Massimo Roberto, Jenna Ryon

Released: 2021-03-29

Updated: 2021-03-29

Primary Reference(s): Ksoll et al. 2021a

DOI: 10.17909/t9-p5vg-ke50

Citations: See ADS Statistics

Read Me

 
Color mosaic image of N44, with distance scale for reference.
MYSST Mosaic of N44

Two color composite image of the MYSST survey, including the reference fields, showing the observations in F555W and F814W in blue and green, respectively.

Plot showing the F555W magnitude of sources as a function of F555W-F814W color.
MYSST Color Magnitude Diagram

Optical color magnitude diagram of the MYSST photometric catalog.

Overview

The "Measuring Young Stars in Space and Time" (MYSST) project is a large, high spatial resolution, deep Hubble Space Telescope survey of the star forming complex N44 located in the Large Magellanic Cloud (LMC). Observing objects with masses as low as 0.09 M_sun (unreddened 1 Myr pre-main-sequence star), the project aims to draw a comprehensive picture of star formation on the scales of giant molecular clouds by quantifying the star formation history of N44 across space and in time. Observations were taken with the Advanced Camera for Surveys (Wide Field Channel) and the Wide Field Camera 3 (UVIS channel) in the broad band filters F555W and F814W, covering a field of view of approximately 12.2 x 14.7 arcmin^2 or 180 x 215 pc^2 at the distance of the LMC.

This archive comprises the primary science output of the survey, i.e. the MYSST photometric catalog and the mosaic images.

Data Products

The image mosaics have the following naming convention:

hlsp_mysst_hst_<ins>_n44_<filter>_v1.0_drc.fits

where:

  • <ins> = Instrument and detected used, either "acs-wfc" or "wfc3-uvis".
  • <filter> = Name of filter used, either "f555w" or "f814w".

The catalog file has this file name:

hlsp_mysst_hst_acs-wfc-wfc3-uvis_n44_f555w-f814w_v1.0_catalog.csv

The catalog has the following columns:

Column Name Description
ID

MYSST coordinate-based name for object

x_px

pixel coordinate X (pixels) in WFC3/UVIS reference image

y_px

pixel coordinate Y (pixels) in WFC3/UVIS reference image

RA

J2000 Right Ascension (degree)

Decl

J2000 Declination (degree)

chi

chi squared PSF fit quality for combined data

snr

signal to noise ratio for combined data

shrp

sharpness for combined data

rnd

roundness for combined data

mjaxdir

direction of major axis (if not round) for combined data

crwd

crowding for combined data

type

DOLPHOT object type (1=bright star, 2=faint, 3=elongated, 4=hot pixel, 5=extended)

f555w_mag

magnitude in F555W (mag)

f555w_mag_err

photometric error of F555W magnitude (mag)

f555w_chi

chi_squared PSF fit quality

f555w_snr

signal to noise ratio

f555w_shrp

sharpness

f555w_rnd

roundness

f555w_crwd

crowding

f555w_flag

photometry quality flag

f814w_mag

magnitude in F814W (mag)

f814w_mag_err

photometric error of F814W magnitude (mag)

f814w_chi

chi_squared PSF fit quality

f814w_snr

signal to noise ratio

f814w_shrp

sharpness

f814w_rnd

roundness

f814w_crwd

crowding

f814w_flag

photometry quality flag

phot_orgn

photometry origin flag

 

0: Aperture photometry used, without matching PSF GST source (176 stars)

1: Aperture photometry used, with matching PSF GST source (750 stars)

2: PSF photometry, aperture blended (360 stars)

3: PSF photometry, high S/N but no aperture detection (77 stars)

4: PSF photometry, low S/N (460,321 stars)

Data file types:

_drc.fits Drizzled, science mosaic for a single filter and instrument+detector.
_catalog.csv Catalog of sources.

Data Access

File Approximate Size
F555W ACS-WFC DRC 4.2 GB
F555W WFC3-UVIS DRC 6.5 GB
F814W ACS-WFC DRC 4.2 GB
F814W WFC3-UVIS DRC 6.5 GB
Source Catalog 95 MB

 

Citations

Please remember to cite the appropriate paper(s) below and the DOI if you use these data in a published work. 

Note: These HLSP data products are licensed for use under CC BY 4.0.

References