Concurrent X-ray, near-infrared, sub-millimeter, and GeV gamma-ray observations of Sagittarius A*

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Table 2

Properties of the X-ray/NIR flares observed so far.

References	Date	Instruments	NIR filter^a	L_X/L_quies^b	F_NIR^c	^d	Id.
					[mJy]	[mJy]

[1] ...............	2009 Apr. 1	XMM/VLT	3.8 μm (L′)	< 7	19	...	A
[1] ...............	2009 Apr. 3	XMM/VLT	3.8 μm (L′)	10	8	...	B
[2, 3] ............	2007 Apr. 4	XMM/VLT	3.8 μm (L′)	103	26	...	C
[2, 4] ............	2007 Apr. 4	XMM/HST	1.7 μm	26	7	16	D
[2, 4] ............	2007 Apr. 4	XMM/HST	1.7 μm	37	4	9	E
[2, 4] ............	2007 Apr. 2	XMM/HST	1.7 μm	14	10	22	F
[5, 6] ............	2004 Aug. 31	XMM/HST	1.6 μm	< 40	10	24	G
[7] ...............	2005 Jul. 31	Chandra/Keck	3.8 μm (L′)	< 1.2	15	...	H
[7] ...............	2006 Jul. 17	Chandra/Keck	3.8 μm (L′)	20	> 5	...	I
[8] ...............	2005 Jun. 30	Chandra/VLT	2.1 μm (K_s)	3	14	4	J
[9] ...............	2005 Jul. 7	Chandra/VLT	2.1 μm (K_s)	15	11	3	K
[10] ..............	2003 Jun. 19	Chandra/VLT	2.1 μm (K_s)	3	> 7	> 2	L

Notes.

^(a)

The HST 1.6 and 1.7 μm pass-bands correspond to the NICMOS filters F160W and F170M, respectively.

^(b)

Peak X-ray luminosity (2–10 keV) in units of the quiescent level (~2 × 10³³ erg s^-1, Baganoff et al. 2003). “ > ” and “ < ” signs were added when the peak flux was missed or not simultaneous with the NIR peak.

^(c)

Background-subtracted peak NIR-fluxes in the bands indicated in the fourth column, dereddened assuming A_{1.6 μm} = 4.5 mag, A_{1.7 μm} = 5.03 mag, A_{2.1 μm} = 2.8 mag, and A_{3.8 μm} = 1.8 mag.

^(d)

Equivalent NIR flux in the L′-band extrapolated assuming a power-law spectral index α = −1 (see Sect. 4).

References. [1] This work, [2] Porquet et al. (2008), [3] Dodds-Eden et al. (2009), [4] Yusef-Zadeh et al. (2009), [5] Bélanger et al. (2005), [6] Yusef-Zadeh et al. (2006a), [7] Hornstein et al. (2007), [8] Eckart et al. (2008a), [9] Eckart et al. (2006a), [10] Eckart et al. (2004).

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