Nvas

class astroquery.nvas.core.Nvas

Bases: astroquery.query.BaseQuery

Attributes Summary

TIMEOUT	int(x=0) -> int or long
URL	str(object=’‘) -> string
band_freqs
valid_bands	list() -> new empty list

Methods Summary

extract_image_urls(*args, **kwds)	Helper function that uses reges to extract the image urls from the given HTML.
get_image_list(*args, **kwds)	Function that returns a list of urls from which to download the FITS images.
get_images(*args, **kwds)	Get an image around a target/ coordinates from the NVAS image archive :Parameters: coordinates : str or astropy.coordinates object The target around which to search.
get_images_async(*args, **kwds)	Serves the same purpose as get_images() but returns a list of file handlers to remote files :Parameters: coordinates : str or astropy.coordinates object The target around which to search.

Attributes Documentation

TIMEOUT = 60

URL = 'https://webtest.aoc.nrao.edu/cgi-bin/lsjouwer/archive-pos.pl'

band_freqs = {'C': (4, 8), 'E': (60, 90), 'D': (110, 170), 'F': (90, 140), 'K': (18, 26.5), 'Ka': (26.5, 40), 'L': (1, 2), 'Q': (30, 50), 'S': (2, 4), 'U': (12, 18), 'W': (75, 110), 'V': (50, 75), 'X': (8, 12)}

valid_bands = ['all', 'L', 'C', 'X', 'U', 'K', 'Q']

Methods Documentation

static extract_image_urls(*args, **kwds)

Helper function that uses reges to extract the image urls from the given HTML.

Parameters :

html_in : str

source from which the urls are to be extracted.

get_uvfits : bool, optional

Gets the UVfits files instead of the IMfits files when set to True. Defaults to False.

Returns :

image_urls : list

The list of URLS extracted from the input.

static get_image_list(*args, **kwds)

Function that returns a list of urls from which to download the FITS images.

Parameters :

coordinates : str or astropy.coordinates object

The target around which to search. It may be specified as a string in which case it is resolved using online services or as the appropriate astropy.coordinates object. ICRS coordinates may also be entered as strings as specified in the astropy.coordinates module.

radius : str or astropy.units.Quantity object, optional

The string must be parsable by astropy.coordinates.Angle. The appropriate Quantity object from astropy.units may also be used. Defaults to 0.25 arcmin.

max_rms : float, optional

Maximum allowable noise level in the image (mJy). Defaults to 10000 mJy.

band : str, optional

The band of the image to fetch. Valid bands must be from [“all”,”L”,”C”,”X”,”U”,”K”,”Q”]. Defaults to ‘all’

get_uvfits : bool, optional

Gets the UVfits files instead of the IMfits files when set to True. Defaults to False.

get_query_payload : bool, optional

if set to True then returns the dictionary sent as the HTTP request. Defaults to False.

Returns :

list of image urls :

static get_images(*args, **kwds)

Get an image around a target/ coordinates from the NVAS image archive

Parameters :

coordinates : str or astropy.coordinates object

The target around which to search. It may be specified as a string in which case it is resolved using online services or as the appropriate astropy.coordinates object. ICRS coordinates may also be entered as strings as specified in the astropy.coordinates module.

radius : str or astropy.units.Quantity object, optional

The string must be parsable by astropy.coordinates.Angle. The appropriate Quantity object from astropy.units may also be used. Defaults to 0.25 arcmin.

max_rms : float, optional

Maximum allowable noise level in the image (mJy). Defaults to 10000 mJy.

band : str, optional

The band of the image to fetch. Valid bands must be from [“all”,”L”,”C”,”X”,”U”,”K”,”Q”]. Defaults to ‘all’

get_uvfits : bool, optional

Gets the UVfits files instead of the IMfits files when set to True. Defaults to False.

verbose : bool, optional

When True print out additional messgages. Defaults to True.

get_query_payload : bool, optional

if set to True then returns the dictionary sent as the HTTP request. Defaults to False.

Returns :

A list of `astropy.fits.HDUList` objects :

static get_images_async(*args, **kwds)

Serves the same purpose as get_images() but returns a list of file handlers to remote files

Parameters :

coordinates : str or astropy.coordinates object

The target around which to search. It may be specified as a string in which case it is resolved using online services or as the appropriate astropy.coordinates object. ICRS coordinates may also be entered as strings as specified in the astropy.coordinates module.

radius : str or astropy.units.Quantity object, optional

The string must be parsable by astropy.coordinates.Angle. The appropriate Quantity object from astropy.units may also be used. Defaults to 0.25 arcmin.

max_rms : float, optional

Maximum allowable noise level in the image (mJy). Defaults to 10000 mJy.

band : str, optional

The band of the image to fetch. Valid bands must be from [“all”,”L”,”C”,”X”,”U”,”K”,”Q”]. Defaults to ‘all’

get_uvfits : bool, optional

Gets the UVfits files instead of the IMfits files when set to True. Defaults to False.

verbose : bool, optional

When True print out additional messgages. Defaults to True.

get_query_payload : bool, optional

if set to True then returns the dictionary sent as the HTTP request. Defaults to False.

Returns :

A list of context-managers that yield readable file-like objects :