Southern HII Region Discovery Survey

Image: Australia Telescope Compact Array. Credit: CSIRO/ATNF.

About

The Southern HII Region Discovery Survey (SHRDS) is an Australia Telescope Compact Array (ATCA) 4-6 and 8-10 GHz radio continuum and radio recombination line survey of Milky Way HII regions. The SHRDS data archive contains all relevant intermediate data products from the final SHRDS data release (the Full Catalog). The available data products are described in detail below.

Pilot Survey: 2017AJ....154...23B
Bright Catalog: 2019ApJS..240...24W
Full Catalog: (in press)

Please acknowledge use of these data products by referencing the Full Catalog paper: (in press).

Links

SHRDS website:
https://www.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/en/community/shrds/

WISE Catalog of Galactic HII Regions:
http://astro.phys.wvu.edu/wise/
The SHRDS detections are included in the latest version of the WISE Catalog.

Machine Readable HII Region Database:
https://doi.org/10.7910/DVN/NQVFLE

Data Product Archive (Canada):
https://doi.org/10.11570/21.0002

Data Product Archive (Australia):
The data archives in the CSIRO Data Access Portal are separated into 15 groups each containing about 1 TB of data. Below are the DOIs for each group and the alphabetically-sorted SHRDS pointings included within each group.

ID	start	end	DOI
1	0723-008	ch1	https://doi.org/10.25919/7nf1-n140
2	ch10	ch268	TBD
3	ch273	g290.012-00.867	TBD
4	g290.323-02.984	mos012	TBD
5	mos013	mos028	TBD
6	mos029	mos046	TBD
7	mos047	mos067	TBD
8	mos068	mos092	TBD
9	mos093	shrds1014	TBD
10	shrds1017	shrds1238	TBD
11	shrds1239	shrds377	TBD
12	shrds382	shrds644	TBD
13	shrds646	shrds782	TBD
14	shrds784	shrds866	TBD
15	shrds888	shrds940	TBD

Data Products

The SHRDS data products are organized by pointing (e.g., "caswell1" is a single pointing). Within each pointing, there are many data files:

Multi-frequency synthesis, 4 GHz bandwidth continuum images.
```
{field name}.cont.IQUV.mfs.{image type}.fits
```
Multi-frequency synthesis, 4 GHz bandwidth primary beam image.
```
{field name}.cont.IQUV.mfs.pb.fits
```
Multi-frequency synthesis, continuum images for individual 256 MHz bandwidth continuum spectral windows.
```
{field name}.{spectral window}.IQUV.mfs.{image type}.fits
```
Multi-frequency synthesis primary beam images for individual 256 MHz bandwidth continuum spectral windows.
```
{field name}.{spectral window}.IQUV.mfs.pb.fits
```
Multi-frequency synthesis, continuum images for individual 64 MHz bandwidth spectral line spectral windows.
```
{field name}.{spectral window}.I.mfs.{image type}.fits
```
Multi-frequency synthesis primary beam images for individual 64 MHz bandwidth spectral line spectral windows.
```
{field name}.{spectral window}.I.mfs.pb.fits
```

Data cubes for each spectral line spectral window.

{field name}.{spectral window}.I.channel.{image type}.fits

Boolean masks defining the "watershed segmentation region" for every WISE Catalog source detected in this pointing.
```
{source name}.*.{spectral window}.fullrgn.fits
```

Where:

```
{field name}
```
is the pointing identifier (e.g., "caswell1")
```
{spectral window}
```
is the spectral window identifier (e.g., "spw10")
```
{image type}
```
is "clean.image" for the image or cube, "clean.residual" for the residual image or cube, "clean.imsmooth.image" for the spatially smoothed image or cube, "clean.imsmooth.residual" for the smoothed residual image or cube
```
{source name}
```
is the WISE Catalog source name (e.g., "G281.175-01.645")