LoTSS DR2 Rotation Measures

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Identifier

ivo://org.gavo.dc/lotsspol/q/cone

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Description

The LOFAR Two Meter Sky Survey LoTSS DR2 (2022A&A...659A...1S) obtained radio data from 27% of the northern sky between 120 and 168 MHz in the year 2014 through 2020. This service publishes polarization spectra of extragalactic radio sources (radio galaxies and blazars) and the rotation measures derived from them. We also give redshifts for all sources. The data has a spatial resolution of 20 arcsec.

Keywords

Creator

O'Sullivan, S.
Shimwell, T. W.
Hardcastle, M. J.
Tasse, C.
Heald, G.
Carretti, E.
Brüggen, M.
Vacca, V.
Sobey, C.
C. L. Van Eck
Horellou, C.
Beck, R.
Bilicki, M.
Bourke, S.
Botteon, A.
Croston, J. H.
Drabent, A.
Duncan, K.
Heesen, V.
Ideguchi, S.
Kirwan, M.
Lawlor, L.
Mingo, B.
Nikiel, B.
Wroczyński, J.
Piotrowska, J.
Scaife, A. M. M.
van Weeren, R. J.

Created

2022-06-07T12:30:55Z

Data updated

2023-01-20T07:33:08Z

Metadata updated

2023-01-20T07:33:07Z

Source

2023arXiv230107697O

Reference URL

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LoTSS DR2 Rotation Measures

	b -- Galactic Latitude
	beamdist -- Distance from beam centre (taken as centre of tile)
	bzcat_name -- Blazar source name in the ROMA-BZCAT catalogue (2015Ap&SS.357...75M)
	catname -- Name of catalog this was taken from.
	channelwidth -- Typical channel width
	complex_test -- Faraday complexity metric
	dec_centre -- Dec of field centre
	flux_type -- Stokes extraction method
	grmerr -- Error in grm.
	i_nvss -- Integrated Stokes I flux density from NVSS
	int_time -- Integration time
	ionosphere -- Ionospheric correction method
	l -- Galactic Longitude
	leakage -- Instrumental leakage estimate
	lgz_dec_deg -- Dec of the host galaxy, mainly from NED.
	lgz_ra_deg -- RA of the host galaxy, mainly from NED.
	lgz_size -- Largest angular size of the source
	madfpol -- Median absolute deviation of degree of polarization in the originating pointing (percent).
	madrm -- Median absolute deviation of RM in the originating pointing.
	medfpol -- Median degree of polarization in the originating pointing (percent).
	medrm -- Median RM in the originating pointing.
	num_in_field -- Number of polarized sources in the originating pointing.
	nvss_rm_err -- Error in rotation measure of the object in NVSS
	obs_interval -- Interval of observation
	p_nvss -- Average peak polarized intensity from NVSS
	pi_nvss -- Percent polarization from NVSS
	pol_bias -- Polarization bias correction method
	ra_centre -- RA of field centre
	rm_err_snr -- Error in RM from signal to noise ratio only
	rm_method -- RM determination method
	separation_nvss -- Difference between NVSS position and LoTSS DR2 position
	snr_rmtools_mad -- Signal to noise ratio based the peak polarized intensity divided by the estimated noise in the Faraday depth spectrum (where the noise is computed using the median deviation from the median of the polarized intensity, and then correcting to be equivalent to a Gaussian sigma).
	telescope -- Name of Telescope(s)