2004ApJ...615L..25E

Query : 2004ApJ...615L..25E

2004ApJ...615L..25E - Astrophys. J., 615, L25-L28 (2004/November-1)

An unveiling event in the type 2 active galactic nucleus NGC 4388:A challenge for a parsec-scale absorber.

ELVIS M., RISALITI G., NICASTRO F., MILLER J.M., FIORE F. and PUCCETTI S.

Abstract (from CDS):

We present two Rossi X-Ray Timing Explorer (RXTE) Proportional Counter Array (PCA) observations of the type 2 Seyfert galaxy NGC 4388 caught in an unusual low X-ray absorption state. The observations were triggered by a detection in the 1.5-3 keV band of the RXTE all-sky monitor. NGC 4388 was found at a somewhat high continuum level [f(2-10 keV)=8x10^–11 ergs/cm2/s] and with a column density N_H∼3x10²²/cm2, a factor of ∼10 lower than normal. The second PCA observation, 4 hr later, gave N_H<2x10²¹/cm2 indicating, at the 3.1 σ level, variability so rapid it puts the absorber on a few 100 Schwarzschild radii scale, similar to the broad emission line region or smaller. This small scale creates difficulties for the parsec-scale obscuring torus paradigm of unified schemes for type 1 and type 2 active galactic nuclei.Subject headings:

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Active - Galaxies: Individual: NGC Number: NGC 4388 - Galaxies: Seyfert - X-Rays: Galaxies

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	NGC 4388	Sy2	12 25 46.820	+12 39 43.45	11.91	11.76	11.02			~	1433	2

Query : 2004ApJ...615L..25E

Basic data :

NGC 4388 -- Seyfert 2 Galaxy

G (2015ApJS,EVCC,...), X (2012ApJS,2E,...), Rad (BWE,GB6,...), AGN ([VV2000c],[VV2003c],...), IR (IRAS,ISOSS,...), Sy2 (2013ApJS), gam (IGR,INTREF), HI (2016A&A,ALFALFA), smm (JCMTSE,JCMTSF), Sy1 (2010A&A), rG (2019ApJ), GiC (VPC), GiG ([CHM2007]), AG? (2020MNRAS), MIR (WISE), Opt (SDSS)

12 25 46.820 +12 39 43.45 (Infrared) [ ] C 2006AJ....131.1163S

12 23 14.683 +12 56 19.87 [ ]

279.121973 +74.335520 [ ]

V(km/s) 2491 [150] / z(emission) 0.00834408 [0.0005] / cz 2501.4923 [150] (Opt) C 2022ApJS..261....2K

SAB_x C 2019MNRAS.488..590B

7.98475 2.06246 90 (Opt) B 2023ApJS..269....3M

U 11.91 [0.09] D 2007ApJS..173..185G

B 11.76 [0.09] D 2007ApJS..173..185G

V 11.02 [0.09] D 2007ApJS..173..185G

J 8.975 [0.021] C 2006AJ....131.1163S

H 8.254 [0.025] C 2006AJ....131.1163S

K 8.004 [0.027] C 2006AJ....131.1163S

u (AB) 13.528 [0.003] C 2011yCat.2306....0A

g (AB) 11.2136 [0.0027] B 2023ApJS..269....3M

r (AB) 10.4952 [0.0027] B 2023ApJS..269....3M

i (AB) 11.191 [0.002] C 2009ApJS..182..543A

z (AB) 9.9216 [0.0028] B 2023ApJS..269....3M

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`NGC 4388`	`LJHY 36`	`TXS 1223+129`	`[DML87] 293`
`ALFALFA 1-311`	`2MASX J12254682+1239434`	`UGC 7520`	`[DSB94] 267`
`BWE 1223+1256`	`MCG+02-32-041`	`UZC J122546.8+123944`	`[KRL2007b] 114`
`2E 2703`	`2MFGC 9788`	`VCC 836`	`[KVC2005] 2`
`2E 1223.2+1256`	`NVSS B122314+125620`	`VPC 438`	`[M98c] 122314.8+125618`
`EVCC 576`	`NVSS J122546+123943`	`WISE J122546.78+123943.9`	`[NKB95] N4388`
`GB6 B1223+1256`	`PBC J1225.7+1240`	`2XMM J122546.7+123943`	`[SLK2000] 45`
`87GB 122314.9+125625`	`PCCS1 857 G279.14+74.33`	`XMMSL1 J122546.2+123930`	`[SLK2004] 699`
`GLEAM J122548+123917`	`PCCS1 545 G279.13+74.34`	`XSS J12260+1248`	`[VV2000c] J122546.7+123941`
`IGR J12258+1240`	`PSCz Q12232+1256`	`Z 70-68`	`[VV2003c] J122546.7+123941`
`INTREF 494`	`1RXP J122546.7+123946`	`Z 1223.3+1256`	`[VV2006c] J122546.7+123941`
`IRAS F12232+1256`	`SDSS J122546.72+123942.7`	`[BAG2012] 186.4482+12.6643`	`[VV2010c] J122546.7+123941`
`IRAS 12232+1256`	`SRGA J122547.1+123938`	`[BEC2010] HRS 144`	`[VV98c] J122546.7+123941`
`ISOSS J12257+1239`	`SWIFT J1225.8+1240`	`[CAB95] IRAS F12232+1256`	`[YOF95] 128`
`JCMTSE J122547.1+123944`	`SWIFT J1225.8+1239`	`[CHM2007] HDC 720 J122546.82+1239434`
`JCMTSF J122547.1+123944`	`SWIFT J1225.7+1239`	`[CHM2007] LDC 904 J122546.82+1239434`
`LEDA 40581`	`TGSSADR J122546.9+123944`	`[DC78] UGC 7520`

References (1433 between 1850 and 2026) (Total 1433)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : NGC 4388

Link by name to the catalogue in VizieR :

`NGC 4388`	`BWE 1223+1256`	`2E 2703`	`IRAS F12232+1256`	`IRAS 12232+1256`
`2MASX J12254682+1239434`	`NVSS B122314+125620`	`NVSS J122546+123943`	`SDSS J122546.72+123942.7`	`UGC 7520`
`WISE J122546.78+123943.9`	`[DML87] 293`

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