2015A&A...581A..99F


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST04:26:19

2015A&A...581A..99F - Astronomy and Astrophysics, volume 581A, 99-99 (2015/9-1)

Spectroscopic identification of 25 disk galaxy candidate gravitational lenses in the SDSS.

FOCARDI P. and ROSSETTI E.

Abstract (from CDS):

Galaxy-scale gravitational lenses are powerful tools, which can be used to address major astrophysical questions that are still open. They can be identified either through imaging or through spectroscopy, which is less efficient than imaging but offers the major advantage of having both source and deflector red shift previously measured at discovery. Spectroscopic identification requires huge data sets of high spectral quality, such as the SDSS, and has so far focused on early-type galaxies, as the most massive galaxies are found among them. We aimed to perform spectroscopic identification of disk galaxies acting as gravitational lenses. We have selected about 300000 galaxy spectra with EW(Hα)≤-10Å from the SDSS DR 8. On these spectra, we ran our original code RES, which is a fast, reliable tool able to provide a red-shift measure and to identify discordant red-shift systems if present. We have required RES to identify only systems based on a minimum number of four emission lines. We have inspected all the (54) SDSS images of the double z systems identified by RES and discarded systems for which z duplicity could be easily ascribed to the presence of two distinct objects. The remaining 25 systems, for which double z is very likely to be due to the gravitational lensing phenomenon, constitute our sample. For each gravitational lens candidate system, we provide SDSS identification and image emission lines detected by RES and activity classification, when derivable. The disky nature of our candidate lenses is confirmed by their images, stellar mass estimates, g-r rest-frame colours and occurrence of star burst phenomena.

Abstract Copyright:

Journal keyword(s): gravitational lensing: strong - techniques: spectroscopic

Simbad objects: 25

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Number of rows : 25

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SDSS J014700.02+135213.7 Sy2 01 47 00.0239159149 +13 52 13.708895785   20.30 19.56     ~ 7 0
2 SDSS J024933.37-080549.4 G 02 49 33.376 -08 05 49.51           ~ 2 0
3 2MASX J08510734+1503440 G 08 51 07.219 +15 03 42.13           ~ 4 0
4 SDSS J085620.98+650324.0 G 08 56 20.990 +65 03 24.07           ~ 3 0
5 SDSS J100143.51+133212.4 Sy2 10 01 43.510 +13 32 12.40           ~ 2 0
6 2MASX J10240370+2451397 G 10 24 03.6759881414 +24 51 39.369771043           ~ 7 0
7 SDSS J104356.09+044443.4 G 10 43 56.093 +04 44 43.49           ~ 3 0
8 SDSS J110840.85+190836.4 G 11 08 40.857 +19 08 36.45           ~ 2 0
9 SDSS J112202.44+162917.0 G 11 22 02.4356996677 +16 29 17.056302669           ~ 2 0
10 2MASX J11455320+4100483 G 11 45 53.158 +41 00 49.67           ~ 3 0
11 SDSS J115537.16+631101.6 G 11 55 37.173 +63 11 01.68           ~ 3 0
12 SDSS J121925.33+273255.0 G 12 19 25.334 +27 32 55.02           ~ 2 0
13 SDSS J131105.31+022528.3 G 13 11 05.3180696233 +02 25 28.247229052           ~ 4 0
14 2dFGRS TGN274Z148 G 14 15 46.224 -01 11 12.42   17.386   17.046   ~ 7 0
15 SDSS J145237.94+091835.3 G 14 52 37.949 +09 18 35.36           ~ 4 0
16 SDSS J150032.76+262539.7 G 15 00 32.759 +26 25 39.76           ~ 2 0
17 SDSS J161037.33+000832.7 G 16 10 37.338 +00 08 32.76           ~ 2 0
18 SDSS J161527.44+270706.1 G 16 15 27.448 +27 07 06.19           ~ 3 0
19 SDSSCGB 26070.2 GiG 16 59 58.803 +35 56 09.44           ~ 2 0
20 MaNGA 1-179385 G 21 06 07.899 -00 47 56.63           ~ 5 0
21 SDSS J214425.44+114423.0 G 21 44 25.441 +11 44 23.06           ~ 3 0
22 SDSS J215813.68+003228.7 G 21 58 13.691 +00 32 28.62           ~ 2 0
23 SDSS J232943.08+152219.9 G 23 29 43.086 +15 22 19.87           ~ 2 0
24 [VV2003c] J233129.3+005217 Sy1 23 31 29.228 +00 52 17.16     20.19     ~ 2 0
25 LEDA 980253 G 23 35 05.817 -10 16 25.27           ~ 4 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-04:26:19

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