II/341 VPHAS+ DR2 survey (Drew+, 2016)
The VST Photometric Halpha Survey of the Southern Galactic Plane and Bulge
(VPHAS+). Second VPHAS data release (DR2).
Drew J.E., Gonzalez-Solares E., Greimel R., Irwin M.J., Kupcu Yoldas A.,
Lewis J., Barentsen G., Eisloffel J., Farnhill H.J., Martin W.E.,
Walsh J.R., Walton N.A., Mohr-Smith M., Raddi R., Sale S.E., Wright N.J.,
Groot P., Barlow M.J., Corradi R.L.M., Drake J.J., Fabregat J., Frew D.J.,
Gansicke B.T., Knigge C., Mampaso A., Morris R.A.H., Naylor T.,
Parker Q.A., Phillipps S., Ruhland C., Steeghs D., Unruh Y.C., Vink J.S.,
Wesson R., Zijlstra A.A.
<VPHAS+ survey, (2016)>
=2016yCat.2341....0D 2016yCat.2341....0D
ADC_Keywords: Surveys ; Photometry, uvby ; Photometry, H-alpha
Mission_Name: ESO
Keywords: surveys - stars: general - HII regions - planetary nebulae: general -
Galaxy: bulge - Galaxy: disc
Abstract:
The primary goal of the VST Photometric Hα Survey of the
Southern Galactic Plane and Bulge (VPHAS+) is to collect single-epoch
ugri broad-band and Ha narrow-band photometry across the southern
Galactic Plane within the latitude range -5°<b<+5° down to
point source magnitudes of ∼21 or better. The VPHAS+ footprint also
includes the inner Galactic Bulge, defined as a 20x20 deg2 box
around the Galactic Centre: this assures optical coverage of the full
VVV footprint. For all massive OBA stars this survey is deep enough to
explore all but the most heavily obscured locations of the southern
Plane, reaching to >4kpc from the Sun. These data will increase the
number of known southern emission line stars by up to an order of
magnitude, yielding much better statistics on important short-lived
types of object. The wide-area uniform photometry obtained will also
facilitate stellar population studies, capable of tracing structure
over much of the southern Plane. VPHAS+ will trawl the star-formation
history of the Galaxy as seen in stellar remnants of all types.
Description:
The Second VPHAS data release (DR2) covers the first 21 months of
data-taking in which the survey progressed to 24 percent completion.
Much of the Galactic mid-plane is now covered (especially in the r, i
and Hα filters). This images release supersedes DR1.
The full description of the catalogue, including a discussion of how
the catalogue was made and advice on best use of the data, is
available as file vphas-dr2-desc.pdf
(ftp://cdsarc.u-strasbg.fr/pub/cats/II/341/vphas-dr2-desc.pdf).
The current photometric scale is linked to APASS in g, r and i, while
the u and Hα bands are calibrated by local offsetting from g and
r. For ESO archive entry, see ESO's public survey pages
(http://eso.org/rm/publicAccess#/dataReleases).
The catalogue was prepared by G. Barentsen, using respectively DAOPHOT
and CASUTOOLS for the PSF and aperture photometry alternatives
provided.
The appropriate journal reference for the use of VPHAS+data is to:
Drew et al., 2014MNRAS.440.2036D 2014MNRAS.440.2036D. If making use of data from this
release, please use the following statement in the acknowledgements:
"Based on data products from observations made with ESO Telescopes
at the La Silla Paranal Observatory under public survey programme ID,
177.D-3023".
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
vphasp.sam 726 1000 VPHAS+ catalog, sample output
(on a total of 319,126,837 sources)
vphas-dr2-desc.pdf 512 751 Associated full description of the catalogue
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See also:
J/MNRAS/440/2036 : VPHAS+ survey synthetic colours (Drew+, 2014)
Byte-by-byte Description of file: vphasp.sam
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Bytes Format Units Label Explanations
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1- 14 A14 --- sourceID Unique VPHAS source identifier in the format
field-extension-number (sourceID)
16- 24 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
(RAJ2000)
26- 34 F9.5 deg DEdeg Declination in decimal degrees (J2000)
(DEJ2000)
36- 62 A27 --- VPHASDR2 Position-based source name. Not a unique
identifier (VPHASDR2 JHHMMSS.s+DDMMSS.s)
(name)
64- 77 A14 --- PrimaryID SourceID of the preferred catalogue entry
for this source (primaryID)
79 I1 --- fPrimary [0/1] Flag =1 if the entry is the preferred
observation of a unique source
(Primary_source)
81 I1 --- Nobs [1-6] Number of observations of this source
in the survey (nObs)
83 I1 --- clean [0/1] =1 if cleang, cleanr2, cleanha, cleanr
and cleani are true (clean)
85- 89 F5.2 mag u-g ? (u-g) colour index, formed by subtracting
columns u and g (u_g)
91- 95 F5.2 mag g-r2 ? (g-r2) colour index, formed by subtracting
columns g and r2 (g_r2)
97-101 F5.2 mag r-i ? (r-i) colour index, formed by subtracting
columns r and i (r_i)
103-107 F5.2 mag r-ha ? (r-Halpha) colour index, formed by
subtracting columns r and ha (r_ha)
109 I1 --- cleanu [0/1] =1 if the u-band detection is
significant and the PSF fit good (clean_u)
111-115 F5.2 mag umag ? Default u-band VEGA magnitude obtained using
PSF fitting (u)
117-121 F5.2 mag umagAB ? Default u-band AB magnitude obtained using
PSF fitting (u_AB)
123-126 F4.2 mag e_umag ? Statistical uncertainty for u,
not including systematics (err_u)
128-132 F5.1 --- chiu ? Goodness of the PSF fit in u,
as determined by DAOPHOT ALLSTAR (chi_u)
134-145 A12 --- warningu Flags problems encountered while fitting the
PSF, if any (warning_u) (1)
147-151 F5.2 mag umagap ? u-band VEGA magnitude obtained using
aperture photometry (aperMag_u)
153-157 F5.2 mag umagapAB ? u-band AB magnitude obtained using
aperture photometry (aperMaguAB)
159-162 F4.2 mag e_umagap ? Statistical uncertainty for umagap,
not including systematics (aperMagErr_u)
164-169 F6.1 --- snru ? Ratio of the signal in the aperture relative
to the background (snr_u)
171-174 F4.1 mag umaglim ? The Vega magnitude a SNR=3 source would have
at this position (magLim_u)
176-179 F4.2 arcsec PSFFWHMu ? Typical PSF FWHM in the CCD frame
(psffwhm_u)
181-188 F8.2 d MJDu ? Modified Julian Date at the start of the
u-band exposure (mjd_u)
190-212 A23 --- detIDu Detection identifier:
night-#exposure-#extension-#number
(detectionID_u)
214 I1 --- cleang [0/1] =1 if the g-band detection is
significant and the PSF fit good (clean_g)
216-220 F5.2 mag gmag ? Default g-band VEGA magnitude obtained using
PSF fitting (g)
222-226 F5.2 mag gmagAB ? Default g-band AB magnitude obtained using
PSF fitting (g_AB)
228-232 F5.2 mag e_gmag ? Statistical uncertainty for g,
not including systematics (err_g)
234-237 F4.1 --- chig ? Goodness of the PSF fit in g,
as determined by DAOPHOT ALLSTAR (chi_g)
239-250 A12 --- warningg Flags problems encountered while fitting the
PSF, if any (warning_g) (1)
252-256 F5.2 mag gmagap ? g-band VEGA magnitude obtained using
aperture photometry (aperMag_g)
258-262 F5.2 mag gmagapAB ? g-band AB magnitude obtained using
aperture photometry (aperMaggAB)
264-267 F4.2 mag e_gmagap ? Statistical uncertainty for gmagap,
not including systematics (aperMagErr_g)
269-274 F6.1 --- snrg ? Ratio of the signal in the aperture relative
to the background (snr_g)
276-279 F4.1 mag gmaglim ? The Vega magnitude a SNR=3 source would have
at this position (magLim_g)
281-284 F4.2 arcsec PSFFWHMg ? Typical PSF FWHM in the CCD frame
(psffwhm_g)
286-293 F8.2 d MJDg ? Modified Julian Date at the start of the
g-band exposure (mjd_g)
295-317 A23 --- detIDg Detection identifier:
night-#exposure-#extension-#number
(detectionID_g)
319 I1 --- cleanr2 [0/1] =1 if the r2-band detection is
significant and the PSF fit good (clean_r2)
321-325 F5.2 mag r2mag ? Second r-band VEGA magnitude obtained using
PSF fitting (r2)
327-331 F5.2 mag r2magAB ? Second r-band AB magnitude obtained using
PSF fitting (r2_AB)
333-336 F4.2 mag e_r2mag ? Statistical uncertainty for r2,
not including systematics (err_r2)
338-341 F4.1 --- chir2 ? Goodness of the PSF fit in r2,
as determined by DAOPHOT ALLSTAR (chi_r2)
343-354 A12 --- warningr2 Flags problems encountered while fitting the
PSF, if any (warning_r2) (1)
356-360 F5.2 mag r2magap ? r2-band VEGA magnitude obtained using
aperture photometry (aperMag_r2)
362-366 F5.2 mag r2magapAB ? r2-band AB magnitude obtained using
aperture photometry (aperMagr2AB)
368-371 F4.2 mag e_r2magap ? Statistical uncertainty for r2magap,
not including systematics (aperMagErr_r2)
373-378 F6.1 --- snrr2 ? Ratio of the signal in the aperture relative
to the background (snr_r2)
380-383 F4.1 mag r2maglim ? The Vega magnitude a SNR=3 source would have
at this position (magLim_r2)
385-388 F4.2 arcsec PSFFWHMr2 ? Typical PSF FWHM in the CCD frame
(psffwhm_r2)
390-397 F8.2 d MJDr2 ? Modified Julian Date at the start of the
r2-band exposure (mjd_r2)
399-421 A23 --- detIDr2 Detection identifier:
night-#exposure-#extension-#number
(detectionID_r2)
423 I1 --- cleanHa [0/1] =1 if the H-alpha detection is
significant and the PSF fit good (clean_ha)
425-429 F5.2 mag Hamag ? Default H-alpha VEGA magnitude obtained
using PSF fitting (ha)
431-434 F4.2 mag e_Hamag ? Statistical uncertainty for ha,
not including systematics (err_ha)
436-439 F4.1 --- chiHa ? Goodness of the PSF fit in H-alpha,
as determined by DAOPHOT (chi_ha)
441-449 A9 --- warningHa Flags problems encountered while fitting the
PSF, if any (warning_ha) (1)
451-455 F5.2 mag Hamagap ? H-alpha VEGA magnitude obtained using
aperture photometry (aperMag_ha)
457-460 F4.2 mag e_Hamagap ? Statistical uncertainty for Hamagap,
not including systematics (aperMagErr_ha)
462-467 F6.1 --- snrHa ? Ratio of the signal in the aperture relative
to the background (snr_ha)
469-472 F4.1 mag Hamaglim ? The Vega magnitude a SNR=3 source would have
at this position (magLim_ha)
474-477 F4.2 arcsec PSFFWHMHa ? Typical PSF FWHM in the CCD frame
(psffwhm_ha)
479-486 F8.2 d MJDHa ? Modified Julian Date at the start of the
H-alpha exposure (mjd_ha)
488-510 A23 --- detIDHa Detection identifier:
night-#exposure-#extension-#number
(detectionID_ha)
512 I1 --- cleanr [0/1] =1 if the r-band detection is
significant and the PSF fit good (clean_r)
514-518 F5.2 mag rmag ? Default r-band VEGA magnitude obtained using
PSF fitting (r)
520-524 F5.2 mag rmagAB ? Default r-band AB magnitude obtained using
PSF fitting (r_AB)
526-529 F4.2 mag e_rmag ? Statistical uncertainty for r,
not including systematics (err_r)
531-534 F4.1 --- chir ? Goodness of the PSF fit in r,
as determined by DAOPHOT ALLSTAR (chi_r)
536-544 A9 --- warningr Flags problems encountered while fitting the
PSF, if any (warning_r) (1)
546-550 F5.2 mag rmagap ? r-band VEGA magnitude obtained using
aperture photometry (aperMag_r)
552-556 F5.2 mag rmagapAB ? r-band AB magnitude obtained using
aperture photometry (aperMagrAB)
558-561 F4.2 mag e_rmagap ? Statistical uncertainty for rmagap,
not including systematics (aperMagErr_r)
563-568 F6.1 --- snrr ? Ratio of the signal in the aperture relative
to the background (snr_r)
570-573 F4.1 mag rmaglim ? The Vega magnitude a SNR=3 source would have
at this position (magLim_r)
575-578 F4.2 arcsec PSFFWHMr ? Typical PSF FWHM in the CCD frame
(psffwhm_r)
580-587 F8.2 d MJDr ? Modified Julian Date at the start of the
r-band exposure (mjd_r)
589-611 A23 --- detIDr Detection identifier:
night-#exposure-#extension-#number
(detectionID_r)
613 I1 --- cleani [0/1] =1 if the i-band detection is
significant and the PSF fit good (clean_i)
615-619 F5.2 mag imag ? Default i-band VEGA magnitude obtained using
PSF fitting (i)
621-625 F5.2 mag imagAB ? Default i-band AB magnitude obtained using
PSF fitting (i_AB)
627-630 F4.2 mag e_imag ? Statistical uncertainty for i,
not including systematics (err_i)
632-635 F4.1 --- chii ? Goodness of the PSF fit in i,
as determined by DAOPHOT ALLSTAR (chi_i)
637-645 A9 --- warningi Flags problems encountered while fitting the
PSF, if any (warning_i) (1)
647-651 F5.2 mag imagap ? i-band VEGA magnitude obtained using
aperture photometry (aperMag_i)
653-657 F5.2 mag imagapAB ? i-band AB magnitude obtained using
aperture photometry (aperMagiAB)
659-662 F4.2 mag e_imagap ? Statistical uncertainty for imagap,
not including systematics (aperMagErr_i)
664-669 F6.1 --- snri ? Ratio of the signal in the aperture relative
to the background (snr_i)
671-674 F4.1 mag imaglim ? The Vega magnitude a SNR=3 source would have
at this position (magLim_i)
676-679 F4.2 arcsec PSFFWHMi Typical PSF FWHM in the CCD frame (psffwhm_i)
681-688 F8.2 d MJDi Modified Julian Date at the start of the
i-band exposure (mjd_i)
690-712 A23 --- detIDi Detection identifier:
night-#exposure-#extension-#number
(detectionID_i)
714-718 A5 --- Field Survey-specific identifier of the telescope
pointing (field)
720-721 I2 --- Ext [1/32] OmegaCAM CCD extension used (ext)
723-726 F4.1 arcsec nbDist Distance to the nearest neighbour detected in
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Note (1): Possible values include
'No_error', 'Off_image', 'Too_faint', and 'Bad_fit'.
The magnitude values are left empty when an error occurred in catalogue
generation. This column is for information only.
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History:
From http://www.vphasplus.org/data.shtml
Acknowledgements:
The appropriate journal reference for the use of VPHAS+data is to:
Drew et al., 2014MNRAS.440.2036D 2014MNRAS.440.2036D. If making use of data from this
release, please use the following statement in the acknowledgements:
"Based on data products from observations made with ESO Telescopes
at the La Silla Paranal Observatory under public survey programme ID,
177.D-3023".
(End) Francois-Xavier Pineau, Patricia Vannier [CDS] 03-Oct-2016