Gathering galaxy properties using HyperLEDA

Created: 2011-11-30 16:49:48 Last updated: 2013-03-08 08:07:14

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The user provides an ASCII text file with a list of galaxy names, and the workflow queries the HyperLEDA database and parses the response with the help of regular expressions included in simple Python scripts. The result of the workflow is a series of ASCII text files with the values of the equatorial coordinates in J2000 epoch, the velocities in km/s, the dust extinction coefficient Ag, the axis ratio of the isophote 25 mag/arcsec2 logr25 and the apparent total B magnitude BT. The performance could be improved since only one query per galaxy is needed for the extraction of five physical properties. Nevertheless, we have decided to split the query into five different queries and provide a more modular workflow, which is best suited for aims of re-usability and re-purposability. It may happen that for other physical properties, values may come from different databases.

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Workflow Components

Authors (1)

Titles (1)

Descriptions (1)

Dependencies (0)

Inputs (0)

Processors (16)

Name	Type	Description
Parse_GalaxyNames_File	workflow
GalaxyNamesFile	stringconstant	Value Enter the file with the leda galaxy names
Extracting_velocities_from_LEDA	workflow
velocity	stringconstant	Value v
Extracting_ag_from_LEDA	workflow
ag	stringconstant	Value ag
Extracting_logr25_from_LEDA	workflow
logr25	stringconstant	Value logr25
Extracting_BT_from_LEDA	workflow
bt	stringconstant	Value bt
Merge_velocity	localworker	Script String seperatorString = "\n"; if (seperator != void) { seperatorString = seperator; } StringBuffer sb = new StringBuffer(); for (Iterator i = stringlist.iterator(); i.hasNext();) { String item = (String) i.next(); sb.append(item); if (i.hasNext()) { sb.append(seperatorString); } } concatenated = sb.toString();
Merge_ag	localworker	Script String seperatorString = "\n"; if (seperator != void) { seperatorString = seperator; } StringBuffer sb = new StringBuffer(); for (Iterator i = stringlist.iterator(); i.hasNext();) { String item = (String) i.next(); sb.append(item); if (i.hasNext()) { sb.append(seperatorString); } } concatenated = sb.toString();
Merge_logr25	localworker	Script String seperatorString = "\n"; if (seperator != void) { seperatorString = seperator; } StringBuffer sb = new StringBuffer(); for (Iterator i = stringlist.iterator(); i.hasNext();) { String item = (String) i.next(); sb.append(item); if (i.hasNext()) { sb.append(seperatorString); } } concatenated = sb.toString();
Merge_bt	localworker	Script String seperatorString = "\n"; if (seperator != void) { seperatorString = seperator; } StringBuffer sb = new StringBuffer(); for (Iterator i = stringlist.iterator(); i.hasNext();) { String item = (String) i.next(); sb.append(item); if (i.hasNext()) { sb.append(seperatorString); } } concatenated = sb.toString();
Extracting_J2000Coordinates_from_LEDA	workflow
Merge_J2000Coordinates	localworker	Script String seperatorString = "\n"; if (seperator != void) { seperatorString = seperator; } StringBuffer sb = new StringBuffer(); for (Iterator i = stringlist.iterator(); i.hasNext();) { String item = (String) i.next(); sb.append(item); if (i.hasNext()) { sb.append(seperatorString); } } concatenated = sb.toString();

Beanshells (0)

Outputs (5)

Name	Description
velocity	Text file with three columns: name of the galaxy, velocity value, error value If there is not error value, it will be NaN
ag	Text file with three columns; the name of the galaxy, the galactic extinction and the error value got from HyperLEDA If there is not error value, it will be NaN
logr25	Text file with three columns: name of the galaxy, log of axis ratio value, error value If there is not error value, it will be NaN
bt	Text file with three columns: name of the galaxy, total B-magnitud value, error value If there is not error value, it will be NaN
j2000Coords	Text file with a list of three columns: the name of the galaxy and its J2000 coordinates

Datalinks (20)

Source	Sink
GalaxyNamesFile:value	Parse_GalaxyNames_File:title
velocity:value	Extracting_velocities_from_LEDA:property
Parse_GalaxyNames_File:lines	Extracting_velocities_from_LEDA:lines
ag:value	Extracting_ag_from_LEDA:property
Parse_GalaxyNames_File:lines	Extracting_ag_from_LEDA:lines
Parse_GalaxyNames_File:lines	Extracting_logr25_from_LEDA:lines
logr25:value	Extracting_logr25_from_LEDA:property
bt:value	Extracting_BT_from_LEDA:property
Parse_GalaxyNames_File:lines	Extracting_BT_from_LEDA:lines
Extracting_velocities_from_LEDA:remoteValues	Merge_velocity:stringlist
Extracting_ag_from_LEDA:remoteValues	Merge_ag:stringlist
Extracting_logr25_from_LEDA:remoteValues	Merge_logr25:stringlist
Extracting_BT_from_LEDA:remoteValues	Merge_bt:stringlist
Parse_GalaxyNames_File:lines	Extracting_J2000Coordinates_from_LEDA:lines
Extracting_J2000Coordinates_from_LEDA:J2000Coords	Merge_J2000Coordinates:stringlist
Merge_velocity:concatenated	velocity
Merge_ag:concatenated	ag
Merge_logr25:concatenated	logr25
Merge_bt:concatenated	bt
Merge_J2000Coordinates:concatenated	j2000Coords