J/MNRAS/447/3856 QSO-galaxy pairs from SDSS (Straka+, 2015)
Galactic nebular lines in the fibre spectra of background QSOs: reaching a
hundred QSO-galaxy pairs with spectroscopic and photometric measurements.
Straka L.A., Noterdaeme P., Srianand R., Nutalaya S., Kulkarni V.P.,
Khare P., Bowen D., Bishof M., York D.G.
<Mon. Not. R. Astron. Soc., 447, 3856-3872 (2015)>
=2015MNRAS.447.3856S 2015MNRAS.447.3856S (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Galaxies, optical ; Photometry, SDSS ; Redshifts
Keywords: galaxies: evolution - galaxies: photometry -
quasars: absorption lines - cosmology: observations
Abstract:
We present photometric and spectroscopic measurements of 53 QSO-galaxy
pairs from the Sloan Digital Sky Survey (SDSS), where nebular emission
lines from a 0<z<0.84 foreground galaxy are detected in the fibre
spectra of a background QSO, bringing the overall sample to 103
QSO-galaxy pairs detected in the SDSS. We here study the nature of
these systems. Detected foreground galaxies appear at impact
parameters between 0.37 and 12.68 kpc. The presence of oxygen and
Balmer emission lines allows us to determine the emission line
metallicities for our sample, which are on average supersolar in
value. Star formation rates for our sample are in the range
0.01-12M☉/yr. We utilize photometric redshift fitting techniques
to estimate the M* values of our galaxies (logM*=7.34-11.54), and
extrapolate this relationship to those galaxies with no imaging
detections. Where available, we measure the absorption features
present in the QSO spectrum due to the foreground galaxy and the
relationships between their rest equivalent widths. We report an
anticorrelation between impact parameter and E(B-V)(g-i), as well as a
correlation between galaxy colour (u- r) and E(B-V)(g-i). We find that
our sample is one of late-type, star-forming galaxies comparable to
field galaxies in a similar redshift range, providing important clues
to better understand absorption systems. These galaxies represent a
sample of typical galaxies in the local Universe for which abundances,
extinction, morphology, and absorption properties may be measured
using background QSOs with great potential for follow-up observations.
Description:
Here, we report 103 galaxies intervening with background QSOs detected
in imaging, spectral emission, and absorption. The advantage of this
sample is that it is entirely random with respect to the foreground
galaxies.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 503 103 Catalogue of GOTOQs
table2.dat 70 53 Photometric data for QSOs
table3.dat 74 53 Photometric data for deconvolved galaxies
table4.dat 34 53 Star formation rates
table5.dat 89 53 Emission line strengths for galaxies in front of
QSOs and emission line metallicities
table6.dat 76 53 Rest-frame equivalent width for absorption
interstellar lines in foreground galaxies
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 11 F5.2 s RAs Right ascension (J2000)
13 A1 --- DE- Declination sign (J2000)
14- 15 I2 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 24 F5.2 arcsec DEs Declination (J2000)
26- 29 I4 --- Plate SDSS Plate number
31- 35 I5 --- MJD SDSS MJD number
37- 39 I3 --- Fiber SDSS Fiber number
41- 45 F5.3 --- zQSO ?=- QSO redshift
47- 52 F6.4 --- zGal ?=- Galaxy redshift
54- 59 F6.1 Mpc DL ?=- Luminosity distance
61- 62 I2 --- Ha ?=- 1 for Hα detection
64- 65 I2 --- [OIII] ?=- 1 for [OIII] detection
67- 68 I2 --- multi ?=- 1 for multiline detection
70- 72 A3 --- visual? [yes/no ] Visual detection flag
74- 79 F6.3 --- RadP ?=- Petrosian radius
81- 85 F5.2 mag rmagpsf ?=- PSF r-band magnitude of the QSO
86 A1 --- l_umagQSO Limit flag on umagqso
87- 91 F5.2 mag umagQSO ?=- QSO SDSS u magnitude
93- 97 F5.2 mag gmagQSO ?=- QSO SDSS g magnitude
99-103 F5.2 mag rmagQSO ?=- QSO SDSS r magnitude
105-109 F5.2 mag imagQSO ?=- QSO SDSS i magnitude
111-115 F5.2 mag zmagQSO ?=- QSO SDSS z magnitude
117 I1 --- NQSOALS ?=- Number of intervening absorption
systems found in the optical QSO
spectra, excluding the system
associated with the galaxy emission
119-123 F5.2 arcsec theta ?=- Image separation θ
125-129 F5.2 --- b ?=- Impact parameter
131 A1 --- l_umagGal Limit flag on umagGal
132-136 F5.2 mag umagGal ?=- Galaxy SDSS u magnitude
138 A1 --- l_logLu Limit flag on logLu
139-143 F5.2 [Lsun] logLu ?=- Galaxy u luminosity
145 A1 --- l_gmagGal Limit flag on gmagGal
146-150 F5.2 mag gmagGal ?=- Galaxy SDSS g magnitude
152 A1 --- l_rmagGal Limit flag on rmagGal
153-157 F5.2 mag rmagGal ?=- Galaxy SDSS r magnitude
159 A1 --- l_logLr Limit flag on LogLr
160-164 F5.2 [Lsun] logLr ?=- Galaxy r luminosity
166 A1 --- l_logL*r Limit flag on L*r
167-171 F5.2 [Lsun] logL*r ?=- Stellar r luminosity
173 A1 --- l_imagGal Limit flag on imagGal
174-178 F5.2 mag imagGal ?=- Galaxy SDSS i magnitude
180 A1 --- l_logLi Limit flag on logLi
181-185 F5.2 [Lsun] logLi ?=- Galaxy i luminosity
187-191 F5.2 --- zmagGal ?=- Galaxy SDSS z magnitude
193 A1 --- l_u-r Limit flag on u-r
194-199 F6.2 mag u-r ?=- u-r galaxy colour index
201-205 F5.2 mag E(B-V)g-i ?=- Absorber rest-frame colour excess
from g-i colour index
207-212 F6.2 10-20W/m2 FHa ?=- Hα flux
214-218 F5.2 10-20W/m2 e_FHa ?=- rms uncertainty on FHa
220 A1 --- l_FHb Limit flag on FHb
221-225 F5.2 10-20W/m2 FHb ?=- Hβ flux
227-231 F5.2 10-20W/m2 e_FHb ?=- rms uncertainty on FHb
233 A1 --- l_F[OII] Limit flag on F[OII]
234-239 F6.2 10-20W/m2 F[OII] ?=- [OII] flux
241-245 F5.2 10-20W/m2 e_F[OII] ?=- rms uncertainty on F[OII]
247 A1 --- l_F[OIII]a Limit flag on F[OIII]a
248-252 F5.2 10-20W/m2 F[OIII]a ?=- [OIII]a flux
255-259 F5.2 10-20W/m2 e_F[OIII]a ?=- rms uncertainty on F[OIII]a
261 A1 --- l_F[OIII]b Limit flag on F[OIII]b
262-267 F6.2 10-20W/m2 F[OIII]b ?=- [OIII]b flux
269-274 F6.2 10-20W/m2 e_F[OIII]b ?=- rms uncertainty on F[OIII]b
276 A1 --- l_F[NII]a Limit flag on F[NII]a
277-281 F5.2 10-20W/m2 F[NII]a ?=- [NII]a flux
283-287 F5.2 10-20W/m2 e_F[NII]a ?=- rms uncertainty on F[NII]a
289 A1 --- l_F[NII]b Limit flag on F[NII]b
290-295 F6.2 10-20W/m2 F[NII]b ?=- [NII]b flux
298-302 F5.2 10-20W/m2 e_F[NII]b ?=- rms uncertainty on F[NII]b
304 A1 --- l_F[SII]a Limit flag on F[SII]a
305-309 F5.2 10-20W/m2 F[SII]a ?=- [SII]a flux
311-315 F5.2 10-20W/m2 e_F[SII]a ?=- rms uncertainty on F[SII]a
317 A1 --- l_F[SII]b Limit flag on F[II]b
318-322 F5.2 10-20W/m2 F[SII]b ?=- [SII]b flux
324-328 F5.2 10-20W/m2 e_F[SII]b ?=- rms uncertainty on F[II]b
330-334 F5.2 --- R23l ?=- Lower value of 12+log(O/H) abundance
from R23 index (1)
336-339 F4.2 --- R23u ?=- Upper value of 12+log(O/H) abundance
from R23 index (1)
342-345 F4.2 --- O3N2 ?=- Abundance (12+log(O/H)) from
O3N2 index (2)
347-350 F4.2 --- N2 ?=- Abundance (12+log(O/H)) from
N2 index (3)
352-356 F5.2 mag E(B-V)Ha/Hb ?=- Interstellar redenning from Ha/Hb
358-362 F5.3 Msun/yr SFRHa ?=- SFR uncorrected for extinction from
Hα
364-368 F5.2 Msun/yr SFROII ?=- SFR uncorrected for extinction from
[OII]
370-374 F5.2 Msun/yr SFRHac ?=- SFR corrected for extinction using
Hα/Hβ from Hα
376-381 F6.2 Msun/yr SFROIIc ?=- SFR corrected for extinction using
Hα/Hβ from [OII]
383-387 F5.2 [Msun] logM* ?=- Stellar Mass
389-392 F4.2 [Msun] e_logM* ?=- Error on logM*
(68% level, lower value)
394-397 F4.2 [Msun] E_logM* ?=- Error on logM*
(68% level, upper value)
399 A1 --- l_CaIIK Limit flag on CaIIK
400-403 F4.2 --- CaIIK ?=- Rest-frame EW for absorption
interstellar line CaIIK
406-409 F4.2 --- e_CaIIK ?=- rms uncertainty on CaIIK
411 A1 --- l_CaIIH Limit flag on CaIIH
412-415 F4.2 --- CaIIH ?=- Rest-frame EW for absorption
interstellar line CaIIH
418-421 F4.2 --- e_CaIIH ?=- rms uncertainty on CaIIH
423 A1 --- l_NaID2 Limit flag on NaID2
424-427 F4.2 --- NaID2 ?=- Rest-frame EW for absorption
interstellar line NaID2
430-433 F4.2 --- e_NaID2 ?=- rms uncertainty on NaID2
435 A1 --- l_NaID1 Limit flag on NaID1
436-439 F4.2 --- NaID1 ?=- Rest-frame EW for absorption
interstellar line NaID1
442-445 F4.2 --- e_NaID1 ?=- rms uncertainty on NaID1
446 A1 --- l_MgII2796 Limit flag on MgII2796
447-450 F4.2 --- MgII2796 ?=- Rest-frame EW for absorption
interstellar line MgII2796
453-456 F4.2 --- e_MgII2796 ?=- rms uncertainty on MgII2796
457 A1 --- l_MgII2804 Limit flag on MgII2804
459-462 F4.2 --- MgII2804 ?=- Rest-frame EW for absorption
interstellar line MgII2804
465-468 F4.2 --- e_MgII2804 ?=- rms uncertainty on MgII2804
470 A1 --- l_MgI2852 Limit flag on MgI2852
471-474 F4.2 --- MgI2852 ?=- Rest-frame EW for absorption
interstellar line MgI2852
477-480 F4.2 --- e_MgI2852 ?=- rms uncertainty on MgI2852
482 A1 --- l_FeII2587 Limit flag on FeII2587
483-486 F4.2 --- FeII2587 ?=- Rest-frame EW for absorption
interstellar line FeII2587
489-492 F4.2 --- e_FeII2587 ?=- rms uncertainty on FeII2587
494 A1 --- l_FeII2600 Limit flag on FeII2600
495-498 F4.2 --- FeII2600 ?=- Rest-frame EW for absorption
interstellar line FeII2600
501-503 F3.1 --- e_FeII2600 ?=- rms uncertainty on FeII2600
--------------------------------------------------------------------------------
Note (1): logR23=log({[OII]3727+[OIII]4959,5007}/Hβ)
Note (2): O3N2= log({[OII]5007/Hβ}/{[NII]6584/Hα})
Note (3): N2= log([NII]6584/Hα)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq Sequential number [1/53]
4- 13 A10 --- Name Name (QHHMM+DDMM)
15- 19 F5.2 mag mPSF(r)a PSF fit from SDSS quantities
21- 26 F6.3 arcsec RadP Petrosian radius measured by SDSS before
deconvolution
28- 32 F5.2 mag umagd ?=- Deconvolved apparent u magnitude
34- 38 F5.2 mag gmagd ?=- Deconvolved apparent g magnitude
40- 44 F5.2 mag rmagd Deconvolved apparent r magnitude
46- 50 F5.2 mag imagd ?=- Deconvolved apparent i magnitude
52- 56 F5.2 mag zmagd ?=- Deconvolved apparent z magnitude
58- 62 F5.2 mag D(g-i) ?=- Observer-frame colour excess (Δg-i)
64- 68 F5.2 mag E(B-V)g-i ?=- Absorber rest-frame colour excess from
g-i colour index
70 I1 --- NQSOALS The number of intervening absorption systems
found in the optical QSO spectra, excluding
the system associated with the galaxy emission
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq [1/53] Sequential number
4- 8 F5.2 arcsec theta ?=- Image separation θ (1)
10- 14 F5.2 kpc b ?=- Impact parameter
16- 20 F5.2 mag umag ?=- SDSS u magnitude
22- 26 F5.2 [Lsun] logLu ?=- Luminosity in u band
28- 32 F5.2 mag gmag ?=- SDSS g magnitude
34- 38 F5.2 mag rmag ?=- SDSS r magnitude
40- 44 F5.2 [Lsun] logLr ?=- Luminsotiy in r-band
46- 50 F5.2 [Lsun] logL*r ?=- Stellar luminosity in r-band
52- 56 F5.2 mag imag ?=- SDSS i magnitude
58- 62 F5.2 [Lsun] logLi ?=- Luminsotiy in i-band
64- 68 F5.2 mag zmag ?=- SDSS z magnitude
70- 74 F5.2 mag u-r ?=- SDSS u-R colour index
--------------------------------------------------------------------------------
Note (1): Dash means that no offset could be determined.
Errors on magnitudes are within 0.05mag.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq [1/53] Sequential number
4- 8 F5.2 mag E(B-V)Ha/Hb ?=- Redenning from Hα/Hβ
10- 14 F5.3 Msun/yr SFRHa1 ?=- SFR uncorrected for extinction
from Hα
16- 20 F5.2 Msun/yr SFR[OII]1 ?=- SFR uncorrected for extinction
from [OII]
22- 26 F5.2 Msun/yr SFRHa2 ?=- SFR corrected for extinction
using Hα/Hβ from Hα
29- 34 F6.2 Msun/yr SFR[OII]2 ?=- SFR corrected for extinction
using Hα/Hβ from [OII]
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq [1/53] Sequential number
4- 9 F6.2 10-20W/m2 FHa ?=- Hα flux
11- 16 F6.2 10-20W/m2 FHb ?=- Hβ flux
19- 24 F6.2 10-20W/m2 F[OII] ?=- [OII] flux
26- 31 F6.2 10-20W/m2 F[OIII]a ?=- [OIII]a flux
32 A1 --- n_F[OIII]a [b] Note on F[OIII]a (1)
35- 40 F6.2 10-20W/m2 F[OIII]b ?=- [OIII]b flux
42- 47 F6.2 10-20W/m2 F[NII]a ?=- [NII]a flux
49- 54 F6.2 10-20W/m2 F[NII]b ?=- [NII]b flux
56- 61 F6.2 10-20W/m2 F[SII]a ?=- [SII]a flux
63- 67 F5.2 10-20W/m2 F[SII]b ?=- [SII]b flux
70- 74 F5.2 --- R23l ?=- Lower value of 12+log(O/H) abundance
from R23 index
76- 79 F4.2 --- R23u ?=- Upper value of 12+log(O/H) abundance
from R23 index
81- 84 F4.2 --- O3N2 ?=- Abundance (12+log(O/H)) from O3N2 index
86- 89 F4.2 --- N2 ?=- Abundance (12+log(O/H)) from N2 index
--------------------------------------------------------------------------------
Note (1): Indicates no emission line detected or emission line is redshifted
out of range of the spectrograph.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq [1/53] Sequential number
4 A1 --- n_Seq Note on Index (1)
6- 11 F6.4 --- zabs ?=- Absorption redshift
13- 18 F6.1 km/s Δv ?=- Relative velocity shift between the
emission and absorption lines
20 A1 --- l_CaIIK Limit flag on CaIIK
21- 24 F4.2 0.1nm CaIIK ?=- Rest-frame equivalent width
of CaIIK, Wλ3933
26 A1 --- l_CaIIH Limit flag on CaIIK
27- 30 F4.2 0.1nm CaIIH ?=- Rest-frame equivalent width
of CaIIH, Wλ3969
32 A1 --- l_NaID2 Limit flag on NaID2
33- 36 F4.2 0.1nm NaID2 ?=- Rest-frame equivalent width
of NaID2, Wλ5890
38 A1 --- n_NaID2 Note on NaID2 (1)
40 A1 --- l_NaID1 Limit flag on l_NaID1
41- 44 F4.2 0.1nm NaID1 ?=- Rest-frame equivalent width
of NaID1, Wλ5896
46 A1 --- n_NaID1 Note on NaID1
48 A1 --- l_MgII1 Limit flag on l_MgII1
49- 52 F4.2 0.1nm MgII1 ?=- Rest-frame equivalent width
of MgII, Wλ2796
54 A1 --- l_MgII2 Limit flag on MgII2
55- 58 F4.2 0.1nm MgII2 ?=- Rest-frame equivalent width
of MgII, Wλ2804
60 A1 --- l_MgI Limit flag on MgI
61- 64 F4.2 0.1nm MgI ?=- Rest-frame equivalent width
of MgI, Wλ2852
66 A1 --- l_FeII1 Limit flag on FeII1
67- 70 F4.2 0.1nm FeII1 ?=-Rest-frame equivalent width
of FeII, Wλ2587
72 A1 --- l_FeII2 Limit flag on FeII2
73- 76 F4.2 0.1nm FeII2 ?=- Rest-frame equivalent width
of FeII, Wλ2600
--------------------------------------------------------------------------------
Note (1): Notes as follows
1 = Also: CH, Wλ4234=1.19
2 = Also: MnII, Wλ2594.50=0.77; CrI, Wλ3579.70=0.68;
CrI, Wλ3594.50=0.63
3 = Also: TiII, Wλ3242.90=1.03
4 = Also: TiII, Wλ3242.90=0.47
5 = Also: MnII, Wλ2606.50=0.32; TiII, Wλ3384.70=0.58;
FeII, Wλ2344.20=1.81; FeII, Wλ2374.50=1.55;
FeII, Wλ2382.80=2.09
6 = These absorption features are blended and measured together
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 27-Apr-2016