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Table 1

NLS1 galaxies for which there have been searches for water maser emission.

Sourcea RAb Decb Vsysc Obs. dated Tint ΔV rmse LH2Of
(J2000) (J2000) (km s-1) (min) (km s-1) (mJy) (L⊙)
IZw1 00:53:34.9 +12:41:36 17658 2011-02-06 20 16153−19177 2.3  < 8.8
TonS180 00:57:20.2 -22:22:56 18581 2011-02-10 20 17068−20109 2.0  < 8.5
Mrk359 01:27:32.5 +19:10:44 5212 2011-02-06 20 3823−6614 2.1  < 0.7
MS01442-0055 01:46:44.7 -00:40:43 24820 2011-02-10 20 23247−26408 1.8  < 13.6
Mrk1044 02:30:05.5 -08:59:53 4932 2011-02-10 20 3545−6331 2.1  < 0.6
HS0328+0528 03:30:52.2 +05:38:26 13790 2011-02-12 20 12322−15272 1.9  < 4.4
IRAS 03450+0055 03:47:40.1 +01:05:14 9294 2011-02-12 20 7868−10734 2.2 67
IRAS04312+4008 04:34:40.9 +40:14:19 6141 2011-02-12 20 4743−7551 2.1  < 1.0
MRK618 04:36:22.2 -10:22:34 10658 2009-11-29 10 9219−12110 3.7  < 5.2
IRAS04416+1215 04:44:28.8 +12:21:11 26652 2011-02-12 20 25061−28258 2.2  < 19.2
IRAS 04576+0912 05:00:20.8 +09:16:56 10822 2009-11-16 10 9381−12276 4.6  < 6.6
IRAS04596-2257 05:01:48.7 -22:53:24 12232 2011-02-12 20 10778−13699 2.6  < 4.8
IRAS 05262+4432 05:29:55.5 +44:34:39 9644 2009-12-30 10 8214−11087 2.5  < 2.8
UGC 3478 06:32:47.2 +63:40:25 3830 2005-12-22 5 2453−5219 5.3  < 0.9
RXJ07527+2617 07:52:45.5 +26:17:37 24632 2011-02-09 20 23061−26218 1.9  < 14.1
Mrk382 07:55:25.3 +39:11:10 10099 2011-02-09 20 8665−11546 1.9  < 2.4
MCG +04.22.042 09:23:43.0 +22:54:32 9705 2008-12-14 40 8268−11141 1.7  < 2.0
MARK 110 09:25:12.9 +52:17:11 10580 2008-02-08 10 9142−12032 3.8  < 5.2
Mrk705 09:26:03.3 +12:44:03 8739 2011-02-09 20 7318−10173 2.1  < 2.0
Mrk707 09:37:01.1 +01:05:43 15091 2011-02-09 20 13611−16585 2.0  < 5.6
Zw 063.060 09:45:29.3 +09:36:10 3988 2009-12-18 10 2610−5378 4.0  < 0.8
Mrk124 09:48:42.6 +50:29:31 16878 2011-02-09 20 15381−18389 1.9  < 6.6
Mrk1239 09:52:19.1 -01:36:44 5974 2011-02-09 20 4578−7383 2.2  < 1.0
IRAS09571+8435 10:05:17.0 +84:20:44 27641 2011-02-12 20 26040−29257 2.0  < 18.7
PG1011-040 10:14:20.7 -04:18:39 17482 2011-02-09 20 15979−18999 1.9  < 7.1
PG1016+336 10:19:49.5 +33:22:04 7345 2011-02-09 20 5936−8766 2.0  < 1.3
MARK 142 10:25:31.3 +51:40:35 13474 2010-02-01 10 12009−14953 2.6  < 5.8
KUG1031+398 10:34:38.6 +39:38:29 12724 2011-02-09 20 11266−14196 1.9  < 3.8
RXJ10407+3300 10:40:43.9 +33:00:59 24512 2011-02-09 20 22942−26097 2.0  < 14.7
Mrk734 11:21:47.1 +11:44:19 15050 2011-02-09 20 13570−16544 2.2  < 6.1
Mrk739E* 11:36:29.3 +21:35:45 8909 2011-02-09 20 7486−10345 1.9  < 1.8
MCG +06.26.012 11:39 13.9 +33:55:51 9819 2010-02-01 10 8388−11263 2.4  < 2.8
Mrk42 11:53:41.8 +46:12:43 7385 2011-02-10 20 5976−8807 2.2  < 1.5
NGC 4051 12:03:09.6 +44:31:53 700 2004-01-31 20 -647−2060 2.5 2
PG1211+143 12:14:17.7 +14:03:13 24253 2011-02-09 20 22685−25835 2.0  < 14.4
MARK 766 12:18 26.5 +29:48:47 3876 2008-03-02 60 2500−5266 1.5 8
MS12170+0700 12:19:30.9 +06:43:34 24157 2011-02-09 20 22590−25739 1.9  < 13.6
MS12235+2522 12:26:04.2 +25:06:38 20086 2011-02-10 20 18558−21628 2.1  < 10.4
IC3599 12:37:41.2 +26:42:28 6459 2011-02-10 20 5059− 7872 2.0  < 1.0
PG1244+026 12:46:35.3 +02:22:08 14443 2011-02-09 20 12969−15931 2.0  < 5.1
NGC 4748 12:52:12.4 -13:24:53 4386 2009-12-16 10 3004−5780 3.5  < 0.8
Mrk783 13:02:58.8 +16:24:27 20146 2011-02-09 20 18618−21688 1.9  < 9.5
R14.01 13:41:12.9 -14:38:40 12528 2011-02-09 20 11072−13998 2.2  < 4.2
Mrk69 13:46:08.1 +29:38:10 22969 2011-02-09 20 21414−24539 1.9  < 12.3
2E1346+2646 13:48:34.9 +26:31:10 17660 2011-02-09 20 16156−19179 2.1  < 8.0
PG1404+226 14:06:21.9 +22:23:46 29380 2011-02-09 20 27763−31013 2.4  < 25.4
NGC5506 14:13:14.8 -03:12:26 1853 2008-10-27 15 494−3224 3.1 24
MARK 684 14:31:04.8 +28:17:14 13814 2010-02-01 10 12346−15296 2.7  < 6.3
Mrk478 14:42:07.5 +35:26:23 23700 2011-02-09 20 22138−25277 2.1  < 14.5
PG1448+273 14:51:08.8 +27:09:27 19487 2011-02-09 20 17965−21023 2.1  < 9.8
IRAS15091-2107 15:11:59.8 -21:19:02 13373 2011-02-09 20 11909−14851 2.4  < 5.3
MS15198-0633 15:22:28.8 -06:44:41 24919 2011-02-09 40 23345−26508 1.5  < 11.4
Mrk486 15:36:38.3 +54:33:33 11672 2011-02-10 30 10224−13134 1.5  < 2.5
IRAS15462-0450 15:48:56.8 -04:59:34 29917 2011-02-09 20 28294−31555 2.5  < 27.4
MARK 493 15:59:09.6 +35:01:47 9392 2010-01-29 10 7965−10832 2.6  < 2.8
IGR J16385-2057 16:38:30.9 -20:55:24 8064 2010-03-28 40 6649−9492 2.0 10
EXO16524+3930 16:54:08.1 +39:25:33 20656 2011-02-09 15 19123−22203 2.3  < 12.0
B31702+457 17:03:30.3 +45:40:48 18107 2011-02-10 20 16598−19630 1.8  < 7.2
RXJ17450+4802 17:45:04.5 +48:02:40 16189 2011-02-10 10 14698−17693 2.8  < 9.0
Kaz163 17:46:59.1 +68:36:28 18887 2011-02-12 15 17371−20417 2.9  < 12.7
Mrk507 17:48:38.4 +68:42:16 16758 2011-02-12 15 15262−18268 3.0  < 10.3
HS1817+5342 18:18:10.4 +53:43:46 23983 2011-02-12 10 22418−25563 4.4  < 31.0
HS1831+5338 18:32:49.7 +53:40:22 11692 2011-02-12 10 10243−13154 5.0  < 8.4
Mrk896 20:46:20.8 –02:48:45 7922 2011-02-06 20 6508− 9349 3.4  < 2.6
IGR J21277+5656 21:27:45.4 +56:56:33 4317 2008-01-27 15 2936−5710 3.0  < 0.7
MS22102+1827 22:12:37.0 +18:42:28 24498 2011-02-10 20 22928−26083 1.9  < 14.0
Akn564 22:42:39.3 +29:43:32 7400 2011-02-10 20 5991−8822 1.9  < 1.3
HS2247+1044 22:49:39.5 +11:00:29 24883 2011-02-06 20 23309−26472 2.3  < 17.5
MS 22549-3712 22:57:38.9 –36:56:07 11692 2010-01-14 10 10243−13154 5.9  < 9.9
Kaz320* 22:59:33.0 +24:55:06 10343 2011-02-06 20 8907−11792 2.6  < 3.4
SDSS J23386-0028 23:38:37.1 –00:28:10 10792 2006-02-07 10 9352−12246 3.2  < 4.6

Notes. Standard text font: our new sample taken from Véron-Cetty et al. (2001); in italics: sources observed in previous surveys; bold face: objects displaying water maser emission.

(a)

Source names and classification are taken from Véron-Cetty et al. (2001) and Véron-Cetty et al. (2001). Source names format: standard text = sources from this work; italics = sources from past surveys; boldface = sources from any survey where H2O maser has been detected.

(b)

Coordinates of the galaxies observed for this work are taken from Veron-Cetty & Veron (2010). For sources targeted by searches for water maser emission in past surveys, we used the coordinates of Braatz et al. (in prep).

(c)

LSR velocities of the galaxies observed for this work are taken from the NASA/IPAC Extragalactic Database (NED). For sources in past surveys we used LSR velocities from Braatz et al. (in prep.).

(d)

All observations were made with the GBT.

(e)

This is the 1σ rms of the spectrum measured for a 24 kHz (0.33 km s-1) channel, after Hanning smoothing.

(f)

Water maser luminosity thresholds have been calculated from the 3σ rms level by assuming a 1 km s-1 line width and a value for H0 = 75 km s-1 Mpc-1. Luminosities for the detected maser sources refer to the total integrated maser luminosity, as reported in Table 2.

(*)

These galaxies were re-observed by ourselves, although they had previously been targeted by searches for water masers at slightly different coordinates and velocities w.r.t. ours (Mrk739E: RA(J2000) = 11:36:29.1; Dec(J2000) = +21:35:46; Vsys = 8956 km s-1. Kaz320: RA(J2000) = 22:59:32.9; Dec(J2000) = +24:55:06; Vsys = 10350 km s-1).

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