bolognastrospectra 0.1.1

A library to plot and get the additional data from the sample of CCs

BolognAstroSpectra

BolognAstroSpectra is a Python library to visualize spectra and retrieve additional information from the Cosmic Chronometers (CCs) sample.

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Installation

Install the package from PyPI:

pip install bolognastrospectra

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Download the Sample

Download the "CCs sample" folder from the following link:

https://drive.google.com/drive/folders/1UOrLtKDxz4pjyyI9eUT7qi08kH3bAo6g?usp=sharing

After downloading, place the CCs sample folder inside your working directory. Alternatively, you can specify its location using the dir_home argument in the library functions.

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Sample Catalog

The complete list of object IDs, surveys, and additional information is available in the accompanying PDF document, which can be downloaded from the same Google Drive folder.

Note: All object IDs are integers except for SNH0pe-NS274, which is a string.

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Documentation

give_info()

give_info(ID, survey, dir_home=None)

Returns the metadata associated with a given object.

Parameters

Parameter	Type	Description
ID	int or str	Object identifier. All IDs are integers except SNH0pe-NS274.
survey	str	Name of the survey to which the object belongs.
dir_home	str, optional	Path to the directory containing the CCs sample folder. If None, the current working directory (os.getcwd()) is used.

Returns

• A tuple containing the object's information if the request is valid.
• None if:
  • the ID does not exist,
  • the survey is incorrect,
  • or the CCs sample folder has been modified or cannot be found.

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give_spectra()

give_spectra(ID, survey, dir_home=None)

Displays the spectrum (or spectra) of the selected object together with its metadata.

Internally, this function first calls give_info() and then plots all available spectra for the requested object.

Parameters

Parameter	Type	Description
ID	int or str	Object identifier. All IDs are integers except SNH0pe-NS274.
survey	str	Name of the survey to which the object belongs.
dir_home	str, optional	Path to the directory containing the CCs sample folder. If None, the current working directory (os.getcwd()) is used.

Returns

• Displays the object information and its spectrum (or spectra).
• Returns None.
• If the inputs are invalid or the sample folder is missing or modified, the function returns None without displaying any spectrum.

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Example

import bolognastrospectra as bas

# Retrieve object information
info = bas.give_info(101, "LEGA-C")
print(info)

# Display the corresponding spectrum
bas.give_spectra(101, "LEGA-C")

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Notes

• Make sure the CCs sample folder has not been renamed or modified.
• If the sample is stored elsewhere, specify its location with the dir_home parameter.
• The catalog PDF contains the complete list of supported IDs and survey names.