Accepted Cycle 12 Observing Proposals

GALACTIC DIFFUSE EMISSION & SURVEYS

Proposal Number	Subject Category	PI Name	Title
12910240	GALACTIC DIFFUSE EMISSION AND SURVEYS	Stocke	Detecting the Hot Wind Escaping from the Galactic Center of the Milky Way
12910379	GALACTIC DIFFUSE EMISSION AND SURVEYS	Mori	Chandra Studies of Unidentified X-ray Sources in the Galactic Bulge
12910860	GALACTIC DIFFUSE EMISSION AND SURVEYS	Terrier	Following the echo of a past flare from Sgr A* in the interstellar medium

Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 12910240

Title: Detecting the Hot Wind Escaping from the Galactic Center of the Milky Way

PI Name: John Stocke

We propose a 300 ksec ACIS + LETG exposure to detect and study our own Galaxy's outflowing nuclear wind. We have used HST and FUSE to discover the absorption signature of this wind in intermediate (e.g. C III) and high (e.g. O VI) ions towards two extragalactic targets above and below the Galactic Center. One of these targets (PKS 2005-489) is bright enough to observe at low resolution with Chandra to address two important questions about this wind: (1) Does any portion of this wind (e.g., O VII & O VIII ions) escape the Galaxy? The C III & O VI ions do not have escape speed; and (2) What is the ionization state and thus the metallicity of the gas? The mass flux, dynamics, and metallicity of this wind will give us valuable insight into the star formation history of the Milky Way.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
20:09:25.40	-48:49:51.60	PKS 2005-489	ACIS-S	LETG	300

Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 12910379

Title: Chandra Studies of Unidentified X-ray Sources in the Galactic Bulge

PI Name: Hideyuki Mori

We propose to study a complete X-ray sample in the luminosity range of > 10^34 erg s^-1 in the Galactic bulge, consisting of 11 unidentified sources detected in the ROSAT All Sky Survey. Our goal is to obtain a clear picture about X-ray populations in the bulge, by utilizing the excellent Chandra position accuracy leading to unique optical identification together with the X-ray spectral properties. This is a new step toward understanding the formation history of the bulge. Furthermore, because the luminosity range we observe corresponds to a ``missing link'' region ever studied for a neutron star or blackhole X-ray binary, our results are also unique to test accretion disk theories at intermediate mass accretion rates.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
16:57:39.10	-29:49:46.00	1RXS J165739.1-294946	ACIS-S	NONE	4
17:00:47.80	-31:44:42.00	1RXS J170047.8-314442	ACIS-S	NONE	4
17:04:28.00	-25:35:20.00	1RXS J170428.0-253520	ACIS-S	NONE	4
17:07:41.70	-32:31:44.00	1RXS J170741.7-323144	ACIS-S	NONE	4
17:14:05.20	-20:27:47.00	1RXS J171405.2-202747	ACIS-S	NONE	4
17:21:47.60	-27:27:46.00	1RXS J172147.6-272746	ACIS-S	NONE	4
17:33:33.00	-18:17:36.00	1RXS J173333.0-181736	ACIS-S	NONE	4
17:39:16.20	-21:47:46.00	1RXS J173916.2-214746	ACIS-S	NONE	4
17:59:11.00	-34:49:21.00	1RXS J175911.0-344921	ACIS-S	NONE	4
18:04:08.90	-34:20:58.00	1RXS J180408.9-342058	ACIS-S	NONE	4
18:28:53.80	-24:17:46.00	1RXS J182853.8-241746	ACIS-S	NONE	4

Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS

Proposal Number: 12910860

Title: Following the echo of a past flare from Sgr A* in the interstellar medium

PI Name: Regis Terrier

The recent observation of apparent superluminal motion of the 6.4 keV Fe fluorescence emission in Galactic filaments proves that they are reflecting X-rays produced by a bright transient event at the Galactic Center, likely from Sgr A* itself. We propose to use the excellent imaging capabilities of Chandra to further follow their propagation in the GC and use their temporal and morphological evolution to constrain the characteristics of the Sgr A* flare(s) such as duration and fluence. Furthermore, we observed variability in H13CO+ ion molecular tracer in recently illuminated filaments suggest that Sgr A* flare influence molecular chemistry in the GC. Thanks to associated IRAM observations, we aim to search for correlated X-ray and molecular tracers variability in the GC.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
17:45:59.70	-28:58:15.90	Sgr A complex	ACIS-I	NONE	160

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